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La Terapia a Pressione Negativa (TPN)
2012 HTA Territoriale Evidence Report N°1 Novembre 2012 Report N. 1 – HTA Assistenza Territoriale La Terapia a Pressione Negativa (TPN) INDICE INTRODUZIONE ALLA TPN Caratteristiche generali della Terapia a Pressione Negativa (TPN) Pag 4 L‟impatto delle lesioni cutanee in sanità Pag 8 METODOLOGIA DI LAVORO PER LA REALIZZAZIONE DELL’EVIDENCE REPORT Il gruppo regionale sull‟HTA distrettuale e l‟evidence report sulla TPN Pag 11 L‟analisi della letteratura scientifica Pag 14 RISULTATI Evidenze dalla letteratura secondaria (report HTA, review, metanalisi, evidence based reccomandations) 2002-2012 nel periodo Pag 19 Evidenze dalla letteratura primaria (trial clinici, Report N. 1 – HTA Assistenza Territoriale studi descrittivi e costo-efficacia) nel biennio 2 2011-2012 Pag 24 Considerazioni generali Pag 26 Conclusioni Pag 33 Tabelle sinottiche Pag 35 Bibliografia generale Pag 69 Report N. 1 – HTA Assistenza Territoriale La Terapia a Pressione Negativa (TPN) 3 La Terapia a Pressione Negativa (TPN) CARATTERISTICHE GENERALI DELLA TERAPIA A PRESSIONE NEGATIVA (TPN) La Terapia a Pressione Negativa (TPN) rappresenta una tecnica terapeutica per il trattamento di un‟ampia gamma di lesioni cutanee acute1 e croniche2. Le modalità attraverso le quali l‟applicazione della TPN favorisce il processo curativo sono: retrazione della ferita; stimolazione della formazione del tessuto di granulazione; pulizia continua della ferita dopo sbrigliamento chirurgico; rimozione continua di fluido interstiziale (essudato); riduzione dell‟edema interstiziale; aumento dell‟irrorazione sanguigna locale; riduzione della carica batterica; riavvicinamento dei margini della ferita. Il trattamento con TPN si realizza mediante l‟utilizzo di dispositivi che consentono un‟applicazione controllata e Report N. 1 – HTA Assistenza Territoriale localizzata una pressione sub-atmosferica in corrispondenza del sito della ferita. Il sistema che permette di realizzare tale modalità è in genere costituito da tre componenti principali: 1 1. apparecchiatura; 2. kit di medicazione; 3. tubo. Lesioni che hanno una durata inferiore o uguale a 8 settimane Lesioni che, dopo 8 settimane hanno perso la capacità di ricostituire la propria integrità anatomica e funzionale. Tali lesioni richiedono un tempo prolungato per cicatrizzare/guarire, non guariscono/cicatrizzano completamente o si riformano frequentemente 2 4 di La Terapia a Pressione Negativa (TPN) L‟apparecchiatura, di dimensioni, forme e materiali variabili a seconda del produttore, generalmente contiene: • un modulo di interfaccia e di controllo per operazioni di “input/output” dei dati, in genere costituito da un display per la visualizzazione delle operazioni da effettuare, dei parametri impostati e del valore dei parametri erogati (tipicamente il valore della pressione espresso in mm Hg) e da tasti per la selezione delle funzioni; • una pompa che genera pressioni negative, impostabili a diversi valori; • un contenitore per la raccolta dell‟essudato (canister), comprensivo di filtri. La medicazione (schiuma o garza) è di dimensioni e forme variabili in funzione della ferita da trattare. La schiuma utilizzata generalmente è ricoperta da un film trasparente, utile ad isolare e sigillare il letto della ferita dai batteri, e a creare il vuoto. Diversi fabbricanti producono schiume contenenti argento o antibiotici. Le garze non-aderenti sono posizionate vicino al letto della Report N. 1 – HTA Assistenza Territoriale lesione e la garza inumidita viene utilizzata per tamponare completamente la ferita. Possono essere anche utilizzate applicata, la garze garza antimicrobiche. viene ricoperta Una da un volta film trasparente adesivo, che anche in questo caso “sigilla” l‟area della lesione. Il tubo, generalmente in polietilene o in silicone, presenta la parte distale inserita direttamente nella medicazione permettendo così di veicolare, grazie al vuoto creato dalla pompa, l‟eccesso dì essudato nel canister dell‟apparecchiatura. Questo contenitore è 5 collegato alla pompa del vuoto che fornisce pressione La Terapia a Pressione Negativa (TPN) negativa, continua e intermittente, regolata a seconda della lesione. La pressione negativa è applicata in un range di 50-200 mmHg in modalità intermittente o continua. I dispositivi possono essere sia fissi che portatili, consentendo di erogare la terapia a pazienti ospedalizzati o domiciliari. Attualmente esistono diversi dispositivi per la TPN. Pur condividendo il meccanismo di base, i vari dispositivi si differenziano principalmente in base al tipo di medicazione utilizzata. sembrerebbero influenzare le Tali differenze indicazioni e le controindicazioni all‟utilizzo sulla base di quanto riportato a riguardo dalle varie ditte produttrici (figure 1,2) Figura1. Indicazioni all‟utilizzo della TPN riportate dalle ditte produttrici Indicazioni all'uso in almeno 8 dispositivi su 9 Report N. 1 – HTA Assistenza Territoriale •Traumi acuti •Lesioni da pressione •Ulcere arti inferiori •Ulcere diabetiche •Ferite deiscenti 6 Indicazioni all'uso itra 3 e 5 dispositivi su 9 •Ustioni •Trapianti di cute •Lembi •Ferite subacute •Ulcere neuropatiche Indicazioni all'uso in meno di 2 dispositivi su 9 •Addome aperto dopo laparotomia •Fistole esplorate La Terapia a Pressione Negativa (TPN) Figura 2. Controindicazioni all‟utilizzo della TPN riportate dalle ditte produttrici Controindicazioni all'uso in 9 dispositivi su 9 •Osteomielite non trattate •Presenza di escara •Lesioni maligne •Esposizione di organi vitali Controindicazioni all'uso in 5 dispositivi su 9 •Fistole non enteriche e non esplorate •Siti anastomotici esposti Controindicazioni all'uso in meno di 2 dispositivi su 9 Report N. 1 – HTA Assistenza Territoriale •Disordini della coagulazione •Malattie ematologiche •Fistole non esplorate •Malnutrizione •Pleura esposta •Peritoneo esposto 7 La Terapia a Pressione Negativa (TPN) L’impatto delle lesioni cutanee in sanità Attraverso la TPN, come precedentemente detto, è possibile trattare diverse tipologie di lesioni cutanee acute e croniche (figura 3) Figura 3. Lesioni cutanee trattabili con la TPN Croniche Da pressione (ulcere da decubito, ulcere neuropatiche*) Infiammatorie (vasculiti, disordini cutanei primari) Da insufficienza vascolare (flebopatie, arteriopatie*, lesioni miste, linfopatie) Acute Da trauma (meccanici, ustionicongelamen to, da radiazioni) Post-operatorie (toraciche, addominali, amputazioni) Da altre cause (infettive, morsi animali ecc) Lesioni maligne Report N. 1 – HTA Assistenza Territoriale (primitive e secondarie) La prevalenza e l‟incidenza delle lesioni cutanee varia a seconda delle classi di età, della popolazione, del setting, della definizione di caso che viene utilizzata e della qualità delle cure. Secondo alcune stime, le lesioni cutanee (acute e croniche) interessano almeno l'1% della popolazione (30). Tale problematica è particolarmente frequente per alcune categorie di individui come quelli diabetici, gli ipertesi, gli anziani, i pazienti sottoposti ad interventi 8 La Terapia a Pressione Negativa (TPN) chirurgici ed in generale quelli ricoverati presso strutture sanitarie. Le lesioni cutanee croniche sono quelle a maggior impatto economico e sanitario. Nella maggior parte dei casi sono riferibili a lesioni da pressione (tra il 70 e l‟80% dei casi); seguono i pazienti con lesioni cutanee vasculopatiche agli arti inferiori (10-15%), con lesioni post chirurgiche (7-12%), neoplastiche (1-4%) e con ustioni (13%). Per quanto riguarda le lesioni da pressione, che rappresentano, tra quelle croniche, le lesioni a più alta frequenza, i dati epidemiologici ci dicono che nei reparti per acuti l‟incidenza puo variare dallo 0,4 al 38% (30); nelle residenze sanitarie assistenziali (RSA) dal 2,2 al 23,9%, mentre nell‟ambito dell‟assistenza domiciliare dallo 0 al 17% (127). In Italia i dati preliminari relativi ad uno studio nazionale di prevalenza che ha valutato 13.081 pazienti ricoverati in 24 strutture ospedaliere, ha documentato un tasso di prevalenza pari al 10,97%, Altri studi condotti dall‟Associazione Infermieristica per lo Studio delle Lesioni Cutanee (AISLeC) riportano dati di prevalenza intorno al 13% (247). Un‟indagine di Report N. 1 – HTA Assistenza Territoriale prevalenza del 2004 condotta dalla Agenzia di Sanita 9 Pubblica della Regione Lazio su un campione di 15 RSA per un totale di 1.111 ospiti valutati con eta media di 79 anni, documenta una prevalenza complessiva del 6,9% con il 67% delle lesioni ad insorgenza durante il soggiorno in RSA e l‟11% durante un ricovero temporaneo in ospedale (48). Report N. 1 – HTA Assistenza Territoriale La Terapia a Pressione Negativa (TPN) 10 La Terapia a Pressione Negativa (TPN) IL GRUPPO REGIONALE SULL’HTA DISTRETTUALE E L’EVIDENCE REPORT SULLA TPN Con delibera n.47 del 28 febbraio 2012 l‟AReS Puglia ha individuato un gruppo multidisciplinare di lavoro, per la valutazione HTA-based dell'assistenza territoriale e del processo di integrazione tra ospedale e territorio", così composto3: - Dr. Gianfranco Budano – Team Leader – specialista area contabilità e controllo di gestione (ASL LE); - Dr. Giuseppe Coratella – Direttore di Distretto Socio Sanitario (ASL BAT), coordinatore del gruppo; - Dr.ssa Fiorella Digiuseppe – Dirigente Farmacista (ASL di Bari); - Dr. Roberto Di Paola – Dirigente Medico U.O. Controllo di Gestione (Policlinico di Bari); - Dr.ssa Angela Gesualdo – Assistente Sociale AReS Puglia; - Dr.ssa Giuseppina Lauriola – Dirigente Medico del Distretto Socio Sanitario di San Marco in Lamis (ASL FG); Report N. 1 – HTA Assistenza Territoriale - 11 Dr.ssa Silvana Melli - componente in carica gruppo HTA; - Dr. Salvatore Scorzafave – Medico specialista epidemiologo – Convenzionato in Organizzazione dei Servizi Sanitari di Base (ASL di Taranto). L‟obiettivo generale del gruppo è quello di individuare nuove tecnologie e prassi gestionali in grado di ottimizzare il rapporto costo-beneficio delle attività poste in essere a livello dei distretti socio sanitari. 3 Alla stesura del report ha partecipato, in qualità di collaboratore esterno, il Dr. Gaetano L‟Assainato (ODT Taranto) La Terapia a Pressione Negativa (TPN) In questa cornice di attività si pone il lavoro riportato nel presente documento e relativo alla TPN dal momento che gran parte delle lesioni cutanee (specie di tipo cronico) riguardano pazienti che vengono assistiti attraverso servizi territoriali domiciliari (cure domiciliari integrate) e residenziali (residenza sanitarie e sociosanitarie assistenziali). L‟ipotesi di fondo, alla base del report, è che la TPN possa rappresentare un trattamento di prima scelta per la cura delle lesioni cutanee da preferire ai trattamenti standard (figura 4) in quanto dotata di maggiore efficacia clinica con vantaggi per i pazienti da un lato e per il sistema sanitario dall‟altro, dal momento che possono essere ridotti gli accessi degli operatori, il consumo di risorse ed essere prevenuti eventuali ricoveri legati all‟evoluzione clinica degli assistiti. Figura 4. Trattamenti standard per le lesioni cutanee acute e croniche Report N. 1 – HTA Assistenza Territoriale LESIONI ACUTE 12 LESIONI CRONICHE •Sulfadiazina argentica •alginati •idrocolloidi •idrogel •garza in soluzione salina 0,9% o soluzione di Ringer •Idrocolloide gel con garza •Soluzioni gel (prodotti in gel (accuzyme, iodosorb, panafil) •Idrogel, alginati e bende di compressione La Terapia a Pressione Negativa (TPN) Nel corso degli anni sono stati realizzati numerosi studi per valutare la TPN in termini di efficacia, sicurezza e costi. Nonostante l‟abbondante letteratura scientifica a riguardo le evidenze per un impiego routinario della TPN come terapia elettiva sono ancora contrastanti. Con il presente report abbiamo dunque inteso verificare lo stato dell‟arte della TPN, al 2012, in termini di efficacia clinica (medicazioni rispetto semplici ed ai trattamenti avanzate standard così come sinteticamente riassunte nella figura 4); esso rappresenta la prima fase di una più ampia linea di attività che prevederà, in un momento successivo, anche un evidence report sul rapporto costo-efficacia della terapia, nell‟ottica di fornire una base informativa utile e valida al fine di elaborare raccomandazioni e linee Report N. 1 – HTA Assistenza Territoriale guida per un utilizzo appropriato della TPN. 13 La Terapia a Pressione Negativa (TPN) L’ANALISI DELLA LETTERATURA SCIENTIFICA Per le predette finalità attraverso le principali banche è stata dati realizzata, bibliografiche (Pubmed, Embase, Cochrane), una ricerca dei lavori scientifici secondari (report HTA, metanalisi, evidence report, revisioni sistematiche ) relativi alla TNP nel periodo compreso tra il 2002 ed il 2012 (novembre) utilizzando le seguenti parole chiave: topical negative pressure, negative pressure wound therapy systems, vacuum assisted closure, chronic wound OR chronic wounds, acute wound OR acute wounds, abdominal wound OR abdominal wounds, abdominal compartment syndrome, open abdomen, diabetic foot ulcers, pressure ulcers, sternal wound, chronic leg ulcers, skin graf OR skin grafts OR skin grafting, wound infection. Gli studi secondari considerati nel presente report, si sono basati su lavori primari che hanno confrontato la TPN alle terapie standard (figura 4), in termini di efficacia clinica valutata attraverso un set di indicatori di outcome (figura 5), per il trattamento di diverse tipologie di lesioni. A riguardo va detto che gli studi secondari hanno operato una aggregazione eterogenea delle Report N. 1 – HTA Assistenza Territoriale fonti primarie producendo evidenze aggregate per 14 lesioni acute e/o croniche. Solo in alcuni casi sono stati realizzati studi secondari su lavori primari condotti per specifiche tipologie di lesioni ed in particolar modo: - Ustioni; - ferite sternali; - lesioni diabetiche; - addome aperto; - lesioni da pressione; - lesioni traumatiche; - lesioni chirurgiche ed innesti. La Terapia a Pressione Negativa (TPN) Figura 5. Indicatori di outcome considerati negli studi primari per la valutazione dell‟efficacia clinica della TPN Indicatori di outcome •riduzione del tempo di cicatrizzazione completa •riduzione del ritmo di cambiamento nell‟area o nel volume •aumento della proporzione di lesioni completamente cicatrizzate •riduzione del tempo di preparazione della lesione per la terapia chirurgica •riduzione del dolore •miglioramento qualità della vita (QUALY) •aumento del tasso sopravvivenza/non rigetto di innesti cutanei (solo per ustioni) Contestualmente alla ricerca degli studi secondari, ne è stata fatta una anche per individuare singoli studi primari (trial clinici randomizzati, studi descrittivi) pubblicati nel biennio 2011-2012 e non inclusi in quelli secondari considerati. L‟analisi della letteratura secondaria relativa al periodo 2002-2012, ha portato all‟individuazione di 28 Report N. 1 – HTA Assistenza Territoriale studi secondari (grafico 1) di cui: 15 - N° 7 report di Health Technology Assesment (HTA); - N° 15 Revisioni Scientifiche (REV); - N° 2 Evidence Based Reccomandations (EBR); - N° 4 Metanalisi (META) La Terapia a Pressione Negativa (TPN) Grafico 1. Tipologia di studi secondari individuati per anno di pubblicazione Anno 2012 4 Report N. 1 – HTA Assistenza Territoriale Anno 2011 16 2 Anno 2010 1 Anno 2009 1 2 Anno 2008 2 Anno 2007 2 Anno 2006 2 Anno 2005 1 Anno 2004 1 Anno 2003 1 2 2 2 2 1 Anno 0 2002 HTA REV EBR META L‟elenco degli studi secondari individuati viene riportato nella figura 6. La Terapia a Pressione Negativa (TPN) Figura 6. Tipologia di studi secondari selezionati nel periodo 2002-2012 (anno della pubblicazione e riferimento bibliografico tra parentesi) Revisioni •2003 (96) •2006 (190,237) •2007 (245,325) •2008 (127,313) •2009 (212,307) •2011 (230,304) •2012 (111,223,266, 326) HTA •2003 (96) •2004 (258) •2005 (55) •2006(143,186) •2009 (209) Metanalisi •2008 (121,306) •2010 (250) •2011 (62,298) EBR •2011 (157,318) Per quanto riguarda gli studi primari relativi al biennio 2011-2012, abbiamo individuato 5 studi tra trial clinici e descrittivi (figura 7). Figura 7. Studi primari individuati nel periodo 2011-2012 (anno della pubblicazione e riferimento bibliografico tra parentesi) Report N. 1 – HTA Assistenza Territoriale Studio Descrittivo Trial clinico 2011 2011 (93,154,234) (323, 329) Il dettaglio degli studi secondari e primari considerati, con l‟abstract in lingua originale, viene riportato nelle tabelle sinottiche a partire da pagina 35. L‟insieme delle fonti utilizzate (studi secondari e relativi studi primari considerati riferiti al periodo 2002-2012 e studi primari relativi al biennio 2011-2012) viene riportata 17 da pagina 69 nella bibliografia generale. Report N. 1 – HTA Assistenza Territoriale La Terapia a Pressione Negativa (TPN) 18 La Terapia a Pressione Negativa (TPN) EVIDENZE DALLA LETTERATURA SECONDARIA (REPORT HTA, REVIEW, METANALISI, EVIDENCE BASED RECCOMANDATIONS) NEL PERIODO 2002-2012 La sintesi delle evidenze risultanti dagli studi secondari, viene riportata nelle tabelle 2-10. Tabella 2. Evidenze dei report HTA (lesioni acute e croniche). Anno 2003 2005 2006 Report N. 1 – HTA Assistenza Territoriale 2006 19 2009 RB* 96 55 143 186 209 TS** Sintesi delle evidenze 17 I risultati sono di bassa qualità (difetti metodologici degli studi analizzati) e forniscono una debole evidenza della superiorità della TPN rispetto ai trattamenti standard in termini di efficacia clinica. 19 Non emergono differenze statisticamente significative tra TPN e trattamenti standard in termini di outcome di salute. Il report sottolinea inoltre la scarsa qualità degli studi sotto il profilo metodologico concludendo che l‟evidenza disponibile non supporta l‟uso routinario della TPN. 22 Non ci sono al momento risultati di riproducibilità adeguata che forniscono una prova di superiorità della TNP in confronto ai trattamenti standard e che giustificherebbero un ampio uso di questo metodo al di fuori delle sperimentazioni cliniche. 23 A causa di limiti metodologici, i dati esistenti dei trial controllati non supportano in modo convincente un beneficio della TNP rispetto ai trattamenti standard in termini di efficacia clinica. 32 Mancano studi metodologicamente validi per supportare I vantaggi della TPN rispetto ai trattamenti standard. Si sottolinea inoltre la mancanza di studi dedicati che hanno confrontato i diversi kit di medicazione utilizzati nella TPN. * Riferimento Bibliografico **Tabella sinottica La Terapia a Pressione Negativa (TPN) Tabella 3. Evidenze delle revisioni (lesioni acute e croniche) Anno 2003 2004 2006 2006 Report N. 1 – HTA Assistenza Territoriale 2008 20 2008 2011 2012 RB* 135 258 190 237 127 306 230 266 TS** Sintesi delle evidenze 16 I risultati suggeriscono che la TPN può avere dei vantaggi rispetto ai trattamenti standard, in termini di guarigione e chiusura di lesioni croniche, anche se i limiti metodologici degli studi primari considerati compromettono la validità degli stessi risultati. 18 Gli studi primari considerati presentano difetti metodologici e non consentono di delineare una differenza significativa tra TPN e trattamenti standard. 20 Singoli studi (case report, retrospettivi ecc.) evidenziano una maggiore efficacia clinica della TPN, rispetto ai trattamenti standard, su un‟ampia gamma di lesioni acute/traumatiche, croniche, da infezione, per il diabete mellito, sternali e vascolari. I trial clinici però sono pochi e con risultati contrastantii tali per cui non risulterebbe giustificabile un uso routinario della TPN. 21 Sulla base dei dati disponibili, seppur ottenuti da studi metodologicamente difettosi, la TPN sembra avere una maggiore efficacia clinica rispetto ai trattamenti standard e con poche complicazioni serie. 26 Gli studi clinici primari considerati, presentano difetti metodologici e come tali non consentono di trarre conclusioni certe in termini di differenze statisticamente significative tra TPN e trattamenti standard sia in termini di guarigione delle ferite che di ottimizzazione del rapporto costo-beneficio. L‟evidenza suggerisce comunque che la TPN è almeno tanto efficace quanto i trattamenti a cui viene comparata. Pur con i limiti del caso, il maggior vantaggio nell‟uso della TPN si delineerebbe nel trattamento di lesioni croniche. 28 I trial che confrontano la TNP con trattamenti standard per lesioni croniche ed acute, hanno difetti metodologici. I dati comunque dimostrano un effetto benefico della TNP sulla guarigione delle ferite anche se sono necessarie indagini di migliore qualità. 38 Non vi sono consistenti evidenze di una maggiore efficacia clinica della TPN rispetto ai trattamenti standard. Ulteriori trial clinici sono necessari. 48 L‟analisi sistematica dei dati mette in evidenza una certa superiorità della TPN rispetto ai trattamenti standard anche se si rendono necessari ulteriori trial clinici per verificarne adeguatamente il livello di efficacia clinica. * Riferimento Bibliografico **Tabella sinottica La Terapia a Pressione Negativa (TPN) Tabella 4. Evidenze delle revisioni scientifiche (lesioni croniche) Anno 2009 2011 2012 RB** TS** Sintesi delle evidenze 30 Gli studi primari considerati presentano difetti metodologici e non consentono di evidenziare in maniera netta la superiorità della TPN in termini di efficacia clinica, rispetto ai trattamenti standard. Ulteriori studi sono necessari. 33 Non vi sono evidenze sufficienti sull‟efficacia della TPN nel trattamento delle lesioni croniche, e quindi la sua diffusione non è giustificata. 45 C‟è un numero ragionevole di prove per sostenere l‟utilizzo della TPN nel trattamento delle lesioni cutanee croniche. La TPN può essere una fonte utile per ridurre i costi di gestioni delle lesioni croniche in quanto in grado di accelerare la guarigione. 307 304 223 Tabella 5. Evidenze delle revisioni scientifiche (lesioni specifiche) Anno Report N. 1 – HTA Assistenza Territoriale 2007 RB* 325 TS** Tipo di lesione 24 Ustioni Non si evidenziano, sulla base degli studi primari inclusi, differenze significative tra TPN e trattamenti standard. Le evidenze disponibili non sono al momento in grado di supportare l‟uso routinario della TPN nella gestione delle ferrite sternali infette. La TPN potrebbe rappresentare un opzione “clinicamente interessante” come terapia di prima linea nelle osteomieliti sternali in pazienti ad elevato rischio. 2007 245 25 Ferite sternali dopo interventi cardiaci 2008 313 29 Lesioni da pressione Non vi sono evidenze nette a supporto della superiorità della TPN rispetto a trattamenti standard. 31 Addome aperto Non vi sono evidenze adeguate circa una maggiore sicurezza ed efficacia della TPN rispetto ai trattamenti standard. 2009 212 2012 111 46 Lesioni diabetiche Ci sono evidenze relative al fatto che la TPN possa favorire la guarigione di ferite post-operatorie, e prevenire la resezione di ulcere neuropatiche plantari (diabetiche) in maniera più efficace rispetto ai trattamenti standard. 2012 326 47 Ferite chirurgiche ed innesti Non vi sono prove a sufficienza circa l‟efficacia della TPN per questa tipologia di ferite. * Riferimento Bibliografico **Tabella sinottica 21 Sintesi delle evidenze La Terapia a Pressione Negativa (TPN) Tabella 6. Evidenze delle Metanalisi (lesioni acute e croniche) Anno 2008 2010 RB* 121 250 TS** Sintesi delle evidenze 27 Sebbene vi siano alcune indicazioni che la TNP possa avere un‟efficacia clinica superiore, rispetto ai trattamenti standard, nel favorire la guarigione delle lesioni acute e croniche, l‟insieme delle evidenze disponibili è insufficiente a provarlo. 34 Anche se permangono alcuni limiti metodologici nella letteratura analizzata (in particolare disomogeneità delle procedure terapeutiche utilizzate nei gruppi di controllo e di trattamento, follow-up breve, disomogeneità nella definizione degli outcomes, disomogeneità nell'inclusione dei pazienti) dalla nostra metanalisi dei dati risultano sufficienti evidenze di efficacia della terapia a pressione negativa nel ridurre il tempo di guarigione, nell‟aumentare la proporzione di ferite guarite, nel ridurre il tempo di preparazione al trattamento chirurgico. In particolare si hanno evidenze di efficacia della terapia a pressione negativa: 1. per ferite acute post chirurgiche difficili (sterno e addome aperto) o con particolari fattori di rischio per la cronicizzazione (amputazione del piede diabetico); 2. come seconda linea di trattamento, per lesioni cutanee croniche difficili ad eccezione delle ulcere da pressione. Le evidenze disponibili per il trattamento delle ulcere da pressione, seppure basate su studi poco robusti, al momento sono di eguale efficacia rispetto ai trattamenti standard. Report N. 1 – HTA Assistenza Territoriale Tabella 7. Evidenze delle Metanalisi (lesioni croniche) 22 Anno 2011 RB* 298 TS** Sintesi delle evidenze 35 Si evidenzia una maggior efficacia della TPN rispetto ai trattamenti standard, per il trattamento delle ferite croniche. Nel gruppo trattato con TPN le dimensioni della ferita erano diminuite significativamente di più rispetto al gruppo con terapia standard. Il tempo di guarigione è stato significativamente più breve nel gruppo trattato con TPN. Questa prima metanalisi sembra dunque fornire risultati più positivi circa l‟efficacia della TPN rispetto ai trattamenti standard anche se non possono essere esclusi difetti legati a bias di pubblicazione. * Riferimento Bibliografico **Tabella sinottica La Terapia a Pressione Negativa (TPN) Tabella 8. Evidenze delle Metanalisi (ferite sternali infette) Anno 2011 RB* 62 TS** Sintesi delle evidenze 36 Rispetto ai trattamenti standard, l‟applicazione della TPN alle ferite sternali infette ha comportato una riduzione di 7,18 giorni in ospedale (intervallo di confidenza (IC) 95%: 10.82, 3.54). Non vi sono differenze, tra i due trattamenti in termini di mortalità. Tabella 9. Evidenze delle EBR (lesioni acute e croniche) Anno 2011 RB* 318 TS** Sintesi delle evidenze 37 La base delle evidenze attuali è più forte per l‟uso della TPN nel trattamento delle lesioni croniche legate al diabete piuttosto che di quelle vascolari (venose). Tabella 10. Evidenze delle EBR (lesioni chirurgiche e traumatiche) Anno 2011 RB* 157 TS** Sintesi delle evidenze 39 La base di evidenza attuale è più forte per l'uso della TPN su trapianti di pelle e più debole come trattamento primario per le ustioni. Report N. 1 – HTA Assistenza Territoriale * Riferimento Bibliografico **Tabella sinottica 23 La Terapia a Pressione Negativa (TPN) EVIDENZE DALLA LETTERATURA PRIMARIA (TRIAL CLINICI, STUDI DESCRITTIVI E COSTO-EFFICACIA) NEL BIENNIO 2011-2012 La sintesi delle evidenze risultanti dagli studi primari, viene riportata nelle tabelle 11-14. Tabella 11. Studio descrittivo retrospettivo sulle lesioni chirurgiche infette, cutanee vascolari e da pressione Anno 2011 RB* 323 TS** Sintesi delle evidenze 40 Lo studio, condotto su 87 pazienti (età media 68 anni, range 16 - 92 anni) ha verificato una maggior efficacia clinica della TPN nel trattamento delle lesioni chirurgiche infette rispetto alle lesioni cutanee vascolari e da pressione (in termini di numero di pazienti guariti) per le quali sono necessari studi dedicati. Tabella 12. Studio costo efficacia sulle lesioni cutanee legate al diabete (piede diabetico) Anno Report N. 1 – HTA Assistenza Territoriale 2011 24 RB* 329 TS** Sintesi delle evidenze 41 Lo studio è stato realizzato su una corte di 1000 pazienti con lesioni ulcerose diabetiche seguiti per 1 anno in strutture sanitarie francesi ed in cui è stata comparata, in termini di efficacia clinica, la TPN alle terapie avanzate. I pazienti trattati con TPN hanno presentato, rispetto a quelli trattati con terapie standard avanzate: un numero maggiore di QALY (0,787 contro 0,784) un tasso di guarigione delle lesioni più elevato (50,2% versus 48,5%); un costo totale delle cure per paziente, in un anno, più basso (24.881 € contro 28.855). Tabella 13. Trial clinico su innesti cutanei Anno 2011 RB* 234 TS** Sintesi delle evidenze 43 Studio condotto su 40 pazienti sottoposti ad innesti cutanei per ferite acute e croniche. La TPN è stata confrontata con i trattamenti standard. La TPN si rivela superiore ai trattamenti standard in termini di quantità di innesto, durata delle medicazioni e costo complessivo. * Riferimento Bibliografico **Tabella sinottica La Terapia a Pressione Negativa (TPN) Tabella 14. Trial clinici in pazienti con lesioni cutanee legate al diabete (piede diabetico) Anno 2011 2011 RB* 154 93 TS** Sintesi delle evidenze 42 Trial clinico su 67 pazienti. Il tempo di guarigione nel gruppo di pazienti trattati con TPN è risultato significativamente più basso di quelli trattati con trattamenti standard rispetto ai quali, i primi presentano punteggi migliori nei questionari utilizzati per valutare lo stato di salute e la qualità di vita. La TPN risulta delinearsi come un trattamento d‟elezione in questo particolare gruppo di pazienti. 44 Trial clinico su 43 pazienti con lesioni cutanee legate al diabete (piede diabetico). La TPN è stata confrontata ai trattamenti standard risultando più efficace in termini di: percentuale di chiusure complete; durata e frequenza di ricovero; tasso di amputazione. I risultati dello studio supportano quelli di altri che hanno dimostrato una maggiore efficacia della TPN, rispetto ai trattamenti standard, nel trattamento delle ulcere del piede diabetico. Report N. 1 – HTA Assistenza Territoriale * Riferimento Bibliografico **Tabella sinottica 25 La Terapia a Pressione Negativa (TPN) CONSIDERAZIONI GENERALI L‟analisi comparativa tra TPN e terapie standard (figura 4) attuata nei vari studi per la valutazione dell‟efficacia clinica, viene influenzata da alcune variabili principali che possiamo così riassumere: - tipo di lesione da trattare; - tipo di medicazione utilizzata: i dati disponibili sembrerebbero evidenziare differenze di efficacia a seconda del tipo di materiale utilizzato (243); - qualità e quantità degli studi considerati: gli studi secondari mettono in risalto come la gran parte dei trial clinici presentino e difetti delle altre fonti metodologici tali primarie da non consentire di trarre conclusioni nette; a ciò si aggiunge poi il fenomeno degli studi interrotti e non pubblicati ed i bias di pubblicazione (121). Dal andamento 2002 a al 3 2012 fasi abbiamo per ciò osservato che concerne un la pubblicazione degli studi primari4 (grafico 2): - la prima fase (1997-2002), che ha visto l‟avvio dei primi studi clinici sull‟argomento; - la seconda fase (2003-2008), con un dibattito Report N. 1 – HTA Assistenza Territoriale scientifico pieno fervore ed in cui si concentrano il maggior numero di studi; - la terza fase (dal 2009 ad oggi), caratterizzata da una riduzione degli studi primari5 sempre più orientati ad una valutazione più selettiva dell‟efficacia per specifiche tipologie di lesioni. Ci si riferisce a quelli inclusi all‟interno degli studi secondari considerati nel presente report. 5 Trial clinici randomizzati. 4 26 in La Terapia a Pressione Negativa (TPN) Grafico 2. Numero di studi primari per anno di pubblicazione Fase 1 Fase 2 Fase 3 44 42 36 33 31 24 19 13 15 16 11 10 7 3 4 5 In virtù di tale andamento, gli studi secondari (HTA, metanalisi, review) hanno potuto usufruire, con il passar del tempo, di una base scientifica sempre più solida in termini quali-quantitativi. Nella tabella 15 riportiamo il riepilogo degli studi secondari classificati in base al livello di evidenza rilevato così come definito nei criteri della National Academy of Clinical Biochemistry Report N. 1 – HTA Assistenza Territoriale (NACL)6 (Figura 8). 27 6 http://www.aacc.org/members/nacb/pages/default.aspx La Terapia a Pressione Negativa (TPN) Tabella 15. Riepilogo degli studi secondari considerati per tipo di evidenza riscontrata secondo i criteri della NACL 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 Report N. 1 – HTA Assistenza Territoriale 2012 28 HTA REV META HTA REV META HTA REV META HTA REV META HTA REV META HTA REV META HTA REV META HTA REV META HTA REV META HTA REV META HTA REV META Evidenza 1 111 62, 298 223 - LEGENDA Tipo di lesione Lesioni acute e croniche Lesioni croniche Ferite chirurgiche sternali Addome aperto Altre ferite chirurgiche Lesioni cutanee legate al diabete Lesioni da pressione Ustioni Evidenza 2a 306 250* 266 - Evidenza 2b 96 135 190,237 127 121 307 - Evidenza 3 258 55 143,186 245, 325 313 209 212 250** 230, 304 326 - Riferimento bibliografico 55,96,121,127,135,143,186,190,209,230,237, 258,266,306. 223,298,304,307 62,245,250* 212,250* 326 111,250* 250**,313 250**,325 La Terapia a Pressione Negativa (TPN) Figura 8. Livelli di evidenza secondo i criteri della NACL Evidenza 1 •Condizioni per le quali ci sono evidenze e/o un consenso generale che una determinata procedura o trattamento è utile ed efficace Evidenza 2 •Condizioni per le quali vi sono evidenze in contrasto e/o divergenze d‟opinione relativamente l‟utilità e/o efficacia di una procedura od un trattamento -2a: Il peso delle evidenze/opinioni appare in favore dell’efficacia/efficienza -2b: l’utilità/efficacia è di minore consistenza nelle evidenze/opinione Evidenza 3 •Condizioni per le quali c‟è evidenza e/o un generale consenso che le procedure/trattamento non è utile/efficace ed in alcuni casi può essere pericoloso - Se analizziamo la letteratura secondaria che ha preso in considerazione studi primari sulla valutazione comparativa dell‟efficacia clinica di lesioni cutanee non specifiche (e quindi di un‟aggregazione eterogenea di lesioni acute e croniche) i risultati che si evidenziano sono alquanto discordanti: - cinque studi secondari non riscontrano differenze, in termini di efficacia, tra TPN e terapie tradizionali (livello di evidenza 3): 2 revisioni (230,258) e 3 Report N. 1 – HTA Assistenza Territoriale report HTA (55,143,209); - sei studi secondari evidenziano risultati contrastanti con, complessivamente, un peso delle evidenze non a favore della maggior efficacia della TPN rispetto alle terapie tradizionali (livello di evidenza 2b): 1 report HTA (96), 4 revisioni (127,135,190,237) ed una metanalisi (121); - due revisioni (266,306), riscontrano un insieme di evidenze che, complessivamente seppur a contrastanti, favore della sono maggior efficacia della TPN rispetto alle terapie tradizionali 29 (livello di evidenza 2a). La Terapia a Pressione Negativa (TPN) Risultati contrastanti si hanno anche dagli studi secondari che hanno considerato solo la macrocategoria delle lesioni croniche come oggetto della valutazione comparata di efficacia: - una revisione del 2009 (307) con un livello di evidenza 2b; - una revisione del 2011 che non ha riscontrato evidenze a supporto della TPN (livello evidenza 3); - una metanalisi del 2011 (298) ed una revisione del 2012 (223) che hanno riscontrato evidenze a supporto della maggior efficacia della TPN rispetto ai trattamenti tradizionali. Riscontri più favorevoli alla TPN provengono dalle metanalisi (che hanno effettuato un‟analisi quantitativa dei dati degli studi primari al fine di supportare in maniera più adeguata la valutazione dei risultati). Una metanalisi del 2010 (250) riscontra evidenze di maggior efficacia della TPN rispetto ai trattamenti standard (evidenza 2a) per quanto riguarda lesioni acute post chirurgiche difficili (sterno e addome aperto) o con particolari fattori di rischio per la cronicizzazione (amputazione del piede diabetico). Un‟altra metanalisi Report N. 1 – HTA Assistenza Territoriale del 2011, precedentemente citata (298), riscontra 30 evidenze di livello 1 a supporto della maggior efficacia della TPN nel favorire i processi di guarigione e/o la riduzione delle dimensioni della ferita nel caso di lesioni croniche. Complessivamente, i riscontri contrastanti emersi dai predetti studi secondari (seppur con una tendenza ad evidenze più positive a supporto della TPN negli studi più recenti), che hanno considerato la TPN per il trattamento di macro-categorie di lesioni (acute e/o croniche) vanno interpretati alla luce di quanto La Terapia a Pressione Negativa (TPN) precedentemente detto in merito alle variabili che influenzano la valutazione comparativa dell‟efficacia clinica e quindi il tipo di lesione oggetto dell‟analisi comparativa, il tipo di medicazione utilizzata per il trattamento con TPN, il numero e la qualità degli studi primari considerati nelle revisioni/metanalisi/report HTA. Per quanto riguarda il livello delle evidenze sull‟efficacia della TPN per il trattamento di lesioni specifiche, riscontriamo quanto segue: 1. Lesioni cutanee legate al diabete: evidenze a favore della maggior efficacia della TPN rispetto alle terapie tradizionali sono fornite da una metanalisi del 2010 (250), da una revisione del 2008 poi aggiornata al 2011 (111), da una EBR del 2011 (318). Esistono poi 3 studi primari del 2011 di cui uno costo efficacia (329) e due trial clinici (93,154) che hanno evidenziato una maggiore efficacia clinica della TPN rispetto ai trattamenti standard. Uno di questi studi in particolare (154) ha anche stimato, per ogni paziente con lesioni diabete trattato con cutanee TPN legate anziché al con Report N. 1 – HTA Assistenza Territoriale trattamenti standard, un risparmio annuo di circa 4000 euro; 2. lesioni da pressione: una revisione del 2008 (313) non ha riscontrato nessuna evidenza di una maggiore efficacia, tradizionali della superiorità, TPN (livello in rispetto di termini alle di terapie evidenza 3) analogamente ad una metanalisi del 2010 (250); 3. ustioni: una revisione del 2007 (325) non ha evidenziato superiorità in efficacia della TPN 31 La Terapia a Pressione Negativa (TPN) (livello evidenza 3). Tale dato emerge anche da una EBR del 2011 (157) 4. addome aperto: una revisione del 2009 (212) non ha riscontrato nessuna evidenza di una maggiore superiorità, in termini di efficacia, della TPN rispetto alle terapie tradizionali (livello di evidenza 3); 5. ferite sternali: una review del 2007 (245), non ha riscontrato superiorità in termini di efficacia della TPN rispetto alle terapie tradizionali (livello di evidenza 3). Una metanalisi del 2011 (62) ha evidenziato la superiorità della TPN rispetto ai trattamenti standard, in termini efficacia valutata attraverso la riduzione dei giorni di Report N. 1 – HTA Assistenza Territoriale degenza in ospedale. 32 La Terapia a Pressione Negativa (TPN) CONCLUSIONI I Distretti Socio Sanitari (DSS), attraverso l‟erogazione di assistenza domiciliare, ambulatoriale e residenziale, rappresentano un contesto sanitario in cui il potenziale di utilizzo della TPN è molto elevato. Attraverso strumenti terapeutici innovativi come la TPN, il DSS può svolgere un ruolo cruciale, all‟interno del SSN, per l‟ottimizzazione della spesa sanitaria ed il miglioramento dello stato di salute degli assistiti. Alla base, al fine di poter conseguire questi risultari, è necessario valutare tali terapie in termini di efficacia pratica (effectiveness) e di sostenibilità economica. Il report da noi realizzato rappresenta la prima fase di un processo valutativo più ampio della TPN, al fine di supportare le azioni degli stakeholder e favorire un uso appropriato della terapia all‟interno dei DSS. In questo primo report abbiamo analizzato le evidenze scientifiche relative all‟efficacia clinica della TPN rispetto ai trattamenti tradizionali per la cura di lesioni cutanee e croniche. I riscontri che abbiamo ottenuto sono così riassumibili: Report N. 1 – HTA Assistenza Territoriale 1. l‟efficacia clinica della TPN varia a seconda delle lesioni cutanee trattate e può essere influenzata dal tipo di medicazione utilizzata nel sistema di TPN; 2. la base scientifica quali-quantitativa, su cui si basano le evidenze riscontrate, presenta diverse criticità che influenzano la validità delle stesse (difetti metodologici degli studi primari, elevato numero di trial clinici interrotti, bias di pubblicazione, scarsità di studi che hanno valutato le differenze - in termini di 33 La Terapia a Pressione Negativa (TPN) efficacia - relative all‟uso di differenti medicazioni nei sistemi di TPN); 3. la maggior parte delle evidenze più forti (livello 2a e livello 1) a sostegno della maggior efficacia clinica della TPN rispetto alle terapie tradizionali, provengono da studi più recenti (dal 2008 in poi); 4. sulla base dell‟analisi della letteratura scientifica considerata, evidenze a supporto dell‟uso della TPN, rispetto alle terapie tradizionali, si hanno per le lesioni cutanee legate al diabete, lesioni croniche difficili (o che non rispondono ai trattamenti tradizionali), lesioni chirurgiche sternali. Evidenze deboli o che non supportano l‟uso della TPN poiché di efficacia equiparabile a quella delle terapie tradizionali, si hanno per lesioni da pressione, ustioni ed altre lesioni di tipo chirurgico (addome aperto, innesti). L‟obiettivo della seconda fase del nostro lavoro sarà quello di realizzare un report che analizzi la letteratura scientifica sulla TPN in termini di costi e costoReport N. 1 – HTA Assistenza Territoriale efficacia al fine di migliorare la conoscenza circa la 34 sostenibilità economica relativa all‟utilizzo di tale terapia nell‟ambito dei DSS. In particolare, rispetto ai tempi di trattamento e di guarigione delle lesioni e su come questi possano condizionare sia i costi che l'organizzazione delle unita di assistenza domiciliare e il turnover dei pazienti assistiti. Report N. 1 – HTA Assistenza Territoriale La Terapia a Pressione Negativa (TPN) 35 La Terapia a Pressione Negativa (TPN) TABELLA 16. ANNO 2003 - REVISIONE – RIF. BIBLIOGRAFICO N° 135 Report N. 1 – HTA Assistenza Territoriale The effectiveness of vacuum assisted closure in wound healing Clayton, Victoria: Centre for Clinical FONTE Effectiveness (CCE) AUTORI Higgins S The three articles identified and included in this report represented four primary studies 2 in the systematic review), with 78 patients randomised to receive vacuum assisted closure (VAC)1 or another wound dressing. Overall, the systematic review and one randomised controlled trial suggest that VAC may have advantages compared to other forms of wound dressing studied in terms of chronic wound healing and wound closure, with one trial finding no difference in the time forì wounds to reduce in volume by 50 per cent. However, methodological limitations of the two trials included in the systematic review, and of the two further studies ABSTRACT appraised in this report limit the validity of any conclusions that can be drawn from them. No studies were identified which reported outcomes such as patient mobility levels or quality of life associated with VAC. Presently, there have been too few reports published of patients randomised to suggest which patient groups may benefit most from VAC, or what regimen is most efficacious. As was highlighted by Evans & Land (2003) and Wanner et al (2003), there is a need for well designed, adequately powered, multi-centre randomised trials to evaluate the contribution of VAC in the management of wounds. 36 La Terapia a Pressione Negativa (TPN) TABELLA 17. ANNO 2003 - REPORT HTA – RIF. BIBLIOGRAFICO N° 96 Report N. 1 – HTA Assistenza Territoriale Vacuum assisted wound closure therapy Issues Emerg Health Technol 2003 Mar;(44):1FONTE 6. AUTORI Fisher A, Brady B. Vacuum assisted closure (VAC) therapy is designed to promote the formation of granulation tissue for faster healing in the wound beds of patients with acute and chronic wounds. Four controlled trials and one interim analysis provide poor quality data and weak evidence that VAC therapy ABSTRACT may be superior to conventional methods used in healing wounds. Complications with VAC therapy are uncommon. Studies are needed to evaluate the effectiveness of VAC therapy when the types of dressings are the same for patients in the groups being compared and VAC therapy is the only differing intervention. 37 La Terapia a Pressione Negativa (TPN) TABELLA 18. ANNO 2004 – REVISIONE – RIF. BIBLIOGRAFICO N° 258 Healing Technologies: Low-Level Laser and Vacuum-Assisted Closure. AHRQ Publication No. 05-E005-2. December FONTE 2004 AUTORI Samson DJ, Lefevre F, Aronson N. The objective of this evidence report is to systematically review and synthesize the available evidence on the effectiveness of low‐level laser treatment and vacuum‐assisted closure for wound healing. Outcomes of interest were: Primary outcomes: Incidence of complete wound closure. Time to complete closure. Adverse events. Report N. 1 – HTA Assistenza Territoriale ABSTRACT 38 Secondary outcomes: Facilitating surgical closure. Need for debridement. Infections. Pain. Activities of daily living. Quality of life. Improved cosmesis. Other secondary outcomes abstracted were change in wound size and transcutaneous oxygen tension (tcpO2); however, these were considered to be of less clinical importance. his systematic review focused on two specific interventions for wound healing, but the issues raised in this discussion should be applied broadly. Because of the large size of populations with nonhealing and other types of wounds, the impact on health care expenditures is considerable. Future research should address how to improve the delivery of care, quality of care, and outcomes of treatment of wounds in various settings. There is potential to reduce the frequency of nonhealing wounds and thus the overall costs of care. New interventions have the potential to improve wound care, but outcomes must be demonstrated in well‐ controlled randomized trials. Strategies for reducing the occurrence of wounds in various susceptible populations also have a place in the research portfolio. Given significant costs of chronic wounds, future comparisons of the cost‐ effectiveness of various strategies for preventing wounds, managing wounds, and improving quality of care would be of value to clinical decisionmakers. La Terapia a Pressione Negativa (TPN) Report N. 1 – HTA Assistenza Territoriale TABELLA 19. ANNO 2005 – REPORT HTA – RIF. BIBLIOGRAFICO N° 55 39 Vacuum-assisted wound closure therapy (V.A.C.). Montreal, McGill University Health Centre, FONTE July 2005 (modified: March 2007) AUTORI Costa V, Brophy J, McGregor M. The published comparative studies did not show a consistent statistical or clinical difference in meaningful health outcomes between patients with complex wounds treated with V.A.C. and other therapies. The quality of the evidence is poor, with small studies and inconsistent study methodology. Therefore, we are lead to concur with the 5 other recent technology assessments and one systematic review that the available evidence does not support the routine use of V.A.C. While V.A.C. may, under certain circumstances, require less nursing time due to less frequent dressing changes, any saving in nursing time may be offset by the increased material costs associated with V.A.C. treatments. The strong opinion of users that this therapy is beneficial cannot be discounted. However, in the past TAU has consistently adhered to the policy that the introduction of an institutional policy that involves the use of public funds demands ABSTRACT stronger evidence than would be necessary for an individual physician or patient deciding to undergo the same intervention. For this reason, any extension of V.A.C.® therapy should not be undertaken in the absence of new evidence. At the same time it would be consistent with the role of academic leadership appropriate for the MUHC to undertake a study to resolve the discrepancy between local expert opinion and the available evidence. No additional V.A.C pumps should be purchased or rented until clear evidence of efficacy becomes available. In view of the conviction of users of V.A.C. therapy at the MUHC that this therapy is effective, the recent purchase of V.A.C. equipment by the institution, and the absence of compelling published evidence of efficacy of V.A.C., the MUHC should urgently consider undertaking studies designed to establish the value of this treatment modality in the different clinical situations in which it is employed. La Terapia a Pressione Negativa (TPN) TABELLA 20. ANNO 2006 – REVISIONE – RIF. BIBLIOGRAFICO N° 190 Report N. 1 – HTA Assistenza Territoriale Negative-pressure wound therapy: a snapshot of the evidence FONTE Int Wound J 2006;3:261–271. AUTORI Mendonca DA, Papini R, Price PE. Topical negative pressure (TNP) is a mode of therapy used to encourage wound healing. It can be used as a primary treatment for chronic/complex wounds or as an adjunct to surgery. Based on the evidence to date, the clinical effectiveness of negative-pressure therapy is still unclear. Although case reports and retrospective studies have demonstrated enhanced wound healing in acute/traumatic wounds, chronic wounds, infected wounds, wounds secondary to diabetes mellitus, sternal wounds and lower limb wounds, there are very few randomised controlled trials, with unclear results. The ABSTRACT evidence is lacking for the use of TNP therapy for other indications to enhance wound healing such as patients with decubitus ulcers, diabetes and peripheral vascular disease and to improve skin graft take. There have been, as yet, no quality-of-life studies available for negative-pressure therapy. Despite this, the usage of TNP has increased. This review provides an overview of clinical studies using TNP and proposes avenues for further research to elucidate the exact mechanism of TNP, in addition to large randomised controlled clinical trials of patients undergoing this therapy. 40 La Terapia a Pressione Negativa (TPN) TABELLA 21. ANNO 2006 – REVISIONE – RIF. BIBLIOGRAFICO N° 237 Report N. 1 – HTA Assistenza Territoriale The safety and efficacy of topical negative pressure in nonhealing wounds: a systematic review FONTE Wound Care. 2006 Jun;15(6):240-50. AUTORI Pham CT, Middleton PF, Maddern GJ. Evidence on topical negative pressure from randomised controlled trials, non-randomised comparative studies and case studies is considered. This is the first systematic review on this therapy to consider results by wound ABSTRACT type. There is a paucity of high-quality RCTs of topical negative pressure for wound management with sufficient sample size and adequate power to detect any differences between topical negative pressure and standard dressings. 41 La Terapia a Pressione Negativa (TPN) TABELLA 22. ANNO 2006 – REPORT HTA – RIF. BIBLIOGRAFICO N° 143 FONTE AUTORI Report N. 1 – HTA Assistenza Territoriale ABSTRACT 42 Negative Pressure Wound Therapy Institute for Quality and Efficiency in Health Care. Year: 2006 No. 041 IQWiG Full-text articles on clinical trials investigating NPWT in patients with acute or chronic wounds were searched for in MEDLINE, EMBASE, CINAHL, and the Cochrane Central Register of Controlled Trials. Trial registries (www.clinicaltrials.gov and www.nrr.nhs.uk) were also screened to identify ongoing trials. Search strategies were adapted and broadened according to the specific structure of each database in order to identify all published non-RCTs. In addition, the Cochrane Library (CDSR, DARE, and HTA) was searched to identify systematic reviews on NPWT. All searches were last updated in October 2005. Furthermore, the US Food and Drug Administration (FDA), other health agencies, clinical experts, and the manufacturers of NPWT devices (Kinetic Concepts, Inc. [KCI], San Antonio, TX; Blue Sky Medical, La Costa, CA) were asked to provide published and unpublished data. Detailed information on the search strategies is available in the full report (see below). There are at present no results of adequate reliability which provide proof of the superiority of NPWT in comparison with conventional therapy, and which would justify broad use of this method outside clinical trial settings. It would be advisable to re-examine this question in 2 to 3 years. La Terapia a Pressione Negativa (TPN) TABELLA 23. ANNO 2006 – REPORT HTA – RIF. BIBLIOGRAFICO N° 186 Report N. 1 – HTA Assistenza Territoriale Negative pressure wound therapy: an evidence-based analysis Ontario Health Technology Assessment Series FONTE 2006;6(14). AUTORI Medical Advisory Secretariat Based on the evidence to date, the clinical effectiveness of NPWT to heal wounds is unclear. Furthermore, saline dressings are not standard practice in Ontario, thereby rendering the literature base irrelevant in an Ontario context. Nonetheless, despite the lack of methodologically sound studies, NPWT has diffused across Ontario. Discussions with Ontario clinical experts have highlighted some deficiencies in the current approach to ABSTRACT wound management, especially in the community. Because NPWT is readily available, easy to administer, and may save costs, compared with multiple daily conventional dressing changes, it may be used inappropriately. The discussion group highlighted the need to put in place a coordinated, multidisciplinary strategy for wound care in Ontario to ensure the best, continuous care of patients. 43 La Terapia a Pressione Negativa (TPN) Report N. 1 – HTA Assistenza Territoriale TABELLA 24. ANNO 2007 – REVISIONE – RIF. BIBLIOGRAFICO N° 325 44 Topical negative pressure (TNP) for partial thickness burns Cochrane Database of Systematic Reviews FONTE 2007, Issue 3. Art. No.: CD006215. DOI: 10.1002/14651858. CD006215.pub2. AUTORI Wasiak J, Cleland H. A burn wound is a complex and evolving injury, with both local and systemic consequences. Treatment includes using variety of dressings, but newer strategies such as topical negative pressure therapy have been developed to try and promote the wound healing process and minimize burn wound progression to involve deeper tissue in the acute phase. Topical negative pressure uses a suction force to drain excess fluids. To assess the effectiveness of TNP for those people with partial thickness burns. We searched the Cochrane Wounds Group Specialised Register (searched April 2007), the Cochrane Central Register of Controlled Trials (CENTRAL)(The Cochrane Library Issue 2, ABSTRACT 2007), Ovid MEDLINE (1950 to April Week 4 2007), Ovid EMBASE (1980 to Week 18 2007) and Ovid CINAHL (1982 to April Week 4 2007). All randomised controlled trials (RCTs) and controlled clinical trials (CCTs) that evaluated the safety and effectiveness of TNP for partial thickness burns. Two authors using standardised forms extracted the data independently. Each trial was assessed for internal validity with differences resolved by discussion. A narrative synthesis of results was undertaken as the absence of missing data, poor reporting, or both precluded the authors to undertake any formal statistical analysis. One RCT satisfied the inclusion criteria. The methodological quality of the trial was poor. La Terapia a Pressione Negativa (TPN) Report N. 1 – HTA Assistenza Territoriale TABELLA 25. ANNO 2007 – REVISIONE – RIF. BIBLIOGRAFICO N° 245 45 Should Vacuum-assisted closure therapy be routinely used for management of deep sternal wound infection after cardiac surgery? Interact Cardiovasc Thorac Surg. 2007 FONTE Aug;6(4):523-7. Epub 2007 Apr 20 AUTORI Raja SG, Berg GA. A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was whether vacuum-assisted closure (VAC) should be routinely used for management of deep sternal wound infection after cardiac surgery. Altogether, 198 papers were identified using the reported search. A further three relevant papers were identified by hand searching reference lists. Thirteen papers represented the best evidence on the topic. The author, journal, date and country of publication, patient group studied, study type, relevant outcomes, results and study weaknesses were tabulated. We conclude that VAC ABSTRACT provides a viable and efficacious adjunctive method by which to treat postoperative wound infection after cardiac surgery. It is especially useful for managing sternal osteomyelitis in high-risk patients and is an attractive option as a first-line therapy in this group of patients. However, currently the evidence to endorse its routine use for management of deep sternal wound infection after cardiac surgery is weak. A randomised controlled trial comparing VAC therapy with the conventional treatment is mandatory to validate its safety, efficacy, and cost effectiveness as a routine first-line therapy for management of deep sternal wound infection after cardiac surgery. La Terapia a Pressione Negativa (TPN) TABELLA 26. ANNO 2008 – REVISIONE – RIF. BIBLIOGRAFICO N° 127 FONTE AUTORI Report N. 1 – HTA Assistenza Territoriale ABSTRACT 46 Vacuum Assisted Closure therapy NHS, June 2008 Hammond C, Clift M. Due to the methodological limitations of the studies reviewed it is not possible to draw firm conclusions. However, the evidence suggests that VAC therapy is at least as effective as the treatments it was compared with. The majority of evidence does indicate a benefit in comparison with „standard wound care‟ e.g. saline moist gauze, however the benefit is less clear when compared with „advanced wound care‟ e.g. hydrocolloids, alginates, in the treatment of chronic and acute wounds. CEP recommends that a high quality independent randomised controlled trial is conducted addressing the methodological limitations of the studies highlighted in this review. CEP also recommends that an independent economic evaluation is undertaken, to include a sensitivity analysis. Further examination of the effectiveness of VAC therapy in the treatment of acute wounds, and costs associated with the treatment of wounds in a community setting, is also required. La Terapia a Pressione Negativa (TPN) TABELLA 27. ANNO 2008 – METANALISI – RIF. BIBLIOGRAFICO N° 121 Report N. 1 – HTA Assistenza Territoriale Negative pressure wound therapy: a vacuum of evidence? 47 FONTE Arch Surg. 2008 Feb;143(2):189-96. AUTORI Gregor S, Maegele M, Sauerland S, Krahn JF, Peinemann F, Lange S. ABSTRACT To systematically examine the clinical effectiveness and safety of negative pressure wound therapy (NPWT) compared with conventional wound therapy. MEDLINE, EMBASE, CINAHL, and the Cochrane Library were searched. Manufacturers were contacted, and trial registries were screened. Randomized controlled trials (RCTs) and nonRCTs comparing NPWT and conventional therapy for acute or chronic wounds were included in this review. The main outcomes of interest were wound-healing variables. After screening 255 full-text articles, 17 studies remained. In addition, 19 unpublished trials were found, of which 5 had been prematurely terminated. Two reviewers independently extracted data and assessed methodologic quality in a standardized manner. Seven RCTs (n = 324) and 10 nonRCTs (n = 278) met the inclusion criteria. The overall methodologic quality of the trials was poor. Significant differences in favor of NPWT for time to wound closure or incidence of wound closure were shown in 2 of 5 RCTs and 2 of 4 non-RCTs. A meta-analysis of changes in wound size that included 4 RCTs and 2 non-RCTs favored NPWT (standardized mean difference: RCTs, -0.57; non-RCTs, -1.30). Although there is some indication that NPWT may improve wound healing, the body of evidence available is insufficient to clearly prove an additional clinical benefit of NPWT. The large number of prematurely terminated and unpublished trials is reason for concern. La Terapia a Pressione Negativa (TPN) TABELLA 28. ANNO 2008 – REVISIONE – RIF. BIBLIOGRAFICO N° 306 A systematic review of topical negative pressure therapy for acute and chronic wounds. FONTE Br J Surg. 2008 Jun;95(6):685-92. AUTORI Ubbink DT, Westerbos SJ, Nelson EA, Vermeulen H. Report N. 1 – HTA Assistenza Territoriale ABSTRACT 48 Topical negative pressure (TNP) therapy is becoming increasingly popular for all kinds of wounds. Its clinical and cost effectiveness is unclear. A search of randomized controlled trials (RCTs) on TNP in adult patients with all kinds of wounds in all settings was undertaken in Medline, Embase, Cinahl (to October 2007) and the Cochrane Library (to issue 4, 2007). Information was also sought from manufacturer of the VAC device. Selection of trials for analysis, quality assessment, data abstraction and data synthesis were conducted by two authors independently. The primary endpoint was any measure of wound healing. Secondary endpoints were infection, pain, quality of life, oedema, microcirculation, bacterial load, adverse events, duration of hospital stay and cost. The search identified 15 publications on 13 RCTs. These reported on patients with chronic wounds, diabetic wounds, pressure ulcers, skin grafts and acute wounds. In chronic and diabetic wounds, TNP did not allow earlier complete wound healing. It was, however, associated with a 1-10 day reduction in the time needed to prepare the wound for secondary closure surgery. In one trial on acute wounds, 17 (95 per cent confidence interval (c.i.) 0.02 to 0.32) per cent more wounds appeared to heal with TNP; the number needed to treat was six. This was, however, at the cost of an 11 (95 per cent c.i. 0.01 to 0.21) per cent higher complication rate; the number needed to harm was nine. There is little evidence to support the use of TNP in the treatment of wounds. La Terapia a Pressione Negativa (TPN) TABELLA 29. ANNO 2008 – REVISIONE – RIF. BIBLIOGRAFICO N° 313 The effectiveness of topical negative pressure in the treatment of pressure ulcers: a literature review FONTE European Journal of Plastic Surgery April 2008, Volume 31, Issue 1, pp 1-7, AUTORI Mark van den Boogaard, Erik de Laat, Paul Spauwen, Lisette Schoonhoven Report N. 1 – HTA Assistenza Territoriale ABSTRACT 49 The objective of the study was to gain insight into the effectiveness of vacuum-assisted closure (VAC) therapy or, more particularly, topical negative pressure (TNP) in the treatment of pressure ulcers. We carried out a systematic search in Medline, Embase and Cinahl for Randomized Clinical Trials (RCTs) involving topical negative pressure in pressure ulcers over the period 1992–2007. Five RCTs were included. Two studies dealt exclusively with pressure ulcers. No significant differences in wound healing were found in these studies. Three other studies (mixed etiology of wounds) did show significant differences in wound healing, in the decrease of wound treatment time, and in the decrease in number of bacteria. The quality of these studies, both in terms of methodology and otherwise, did not always match with the scientific standard. Moreover, these studies lacked subgroup analyses. The analyzed studies described positive effects of TNP, although both the control treatment and the end points varied in these studies. On the basis of the systematic assessment of these five RCTs, the conclusion is that TNP has not proven to be more effective than various control interventions. The differences between and within the studies in terms of control interventions, the differences in randomization and a number of weaknesses in the analyses do not allow a good comparison. The main recommendations for follow-up studies include: randomization of patients rather than of wounds, a homogeneous patient population, the use of a single well-defined and procedurally documented control intervention, and prior calculation of the random sample size La Terapia a Pressione Negativa (TPN) TABELLA 30. ANNO 2009 – REVISIONE – RIF. BIBLIOGRAFICO N° 307 Topical negative pressure for treating chronic wounds FONTE Cochrane Database of Systematic Reviews 2009, Issue 3.. AUTORI Ubbink DT, Westerbos SJ, Evans D, Land L, Vermeulen H. Report N. 1 – HTA Assistenza Territoriale ABSTRACT 50 Chronic wounds mainly affect the elderly and those with multiple health problems. Despite the use of modern dressings, some of these wounds take a long time to heal, fail to heal, or recur, causing significant pain and discomfort to the person and cost to health services. Topical negative pressure (TNP) is used to promote healing of surgical wounds by using suction to drain excess fluid from wounds. To assess the effects of TNP on chronic wound healing. For this second update of this review we searched the Cochrane Wounds Group Specialised Register (December 2007), The Cochrane Central Register of Controlled Trials (CENTRAL) - The Cochrane Library Issue 4, 2007, Ovid MEDLINE In addition, we contacted authors, companies, manufacturers, and distributors to identify relevant trials and information. All randomised controlled trials which evaluated the effects of TNP on people with chronic wounds. Selection of the trials, quality assessment, data abstraction, and data synthesis were done by two authors independently. Disagreements were solved by discussion. Two trials were included in the original review. A further five trials were included in this second update resulting in a total of seven trials involving 205 participants. The seven trials compared TNP with five different comparator treatments. Four trials compared TNP with gauze soaked in either 0.9% saline or Ringer's solution. The other three trials compared TNP with hydrocolloid gel plus gauze, a treatment package comprising papain-urea topical treatment, and cadexomer iodine or hydrocolloid, hydrogels, alginate and foam. These data do not show that TNP significantly increases the healing rate of chronic wounds compared with comparators. Data on secondary outcomes such as infection rate, quality of life, oedema, hospitalisation and bacterial load were not reported. Trials comparing TNP with alternative treatments for chronic wounds have methodological flaws and data do demonstrate a beneficial effect of TNP on wound healing however more, better quality research is needed. La Terapia a Pressione Negativa (TPN) TABELLA 31. ANNO 2009 – REVISIONE – RIF. BIBLIOGRAFICO N° 212 Negative pressure wound therapy for the open abdomen FONTE http://guidance.nice.org.uk/IPG322 AUTORI Report N. 1 – HTA Assistenza Territoriale ABSTRACT 51 National Institute for Health and Clinical Excellence This overview is based on 662 patients from one randomised controlled trial1, two nonrandomised controlled trials, four case series4–6 and one case report. Current evidence on the safety and efficacy of negative pressure wound therapy (NPWT) for the open abdomen is inadequate in quality and quantity. There has been concern about the occurrence of intestinal fistulae associated with this procedure but there is currently no evidence about whether NPWT is the cause. Therefore clinicians should make special arrangements for audit of the management of all patients with an open abdominal wound, as recommended below. La Terapia a Pressione Negativa (TPN) TABELLA 32. ANNO 2009 – REPORT HTA – RIF. BIBLIOGRAFICO N° 209 Negative Pressure Wound Therapy Devices. Technology Assessment Report. FONTE https://www.ecri.org/Documents/Press%20Rel eases/Negative_Pressure_Wound_Therapy_D evices.pdf AUTORI Institute under contract to the Agency for Healthcare Research and Quality (AHRQ) Report N. 1 – HTA Assistenza Territoriale ABSTRACT 52 We identified a total of 22 other systematic reviews, all published between 2000 and 2008, that covered NPWT devices. These reviews included studies reporting data on NPWT for patients with a broad range of wound types and focused on comparison to other wound treatments (gauze, bolster dressings, wound gels, alginates, and other topical therapies). The systematic reviews of NPWT reveal several important points about the current state of the evidence on this technology. First, all of the systematic reviews noted the lack of high-quality clinical evidence supporting the advantages of NPWT compared to other wound treatments. The lack of high-quality NPWT evidence resulted in many systematic reviewers relying on low-quality retrospective studies to judge the efficacy of this technology. Second, no studies directly comparing different NPWT components (such as foam vs. gauze dressings) were identified by any of the reviewers. All of the systematic reviews noted the lack of high-quality clinical evidence supporting the advantages of NPWT compared to other wound treatments. No studies directly comparing different NPWT components (such as foam vs. gauze dressings) were identified by any of the reviewers La Terapia a Pressione Negativa (TPN) TABELLA 33. ANNO 2010 – REVISIONE – RIF. BIBLIOGRAFICO N° 304 Effectiveness, safety and cost-effectiveness of the negative pressure wound therapy on the treatment of chronic wounds: a systematic review FONTE Med Clin (Barc). 2011 Sep 17;137(7):321-8. Epub 2010 Oct 2 AUTORI Trujillo-Martín M, García-Pérez L, SerranoAguilar P Report N. 1 – HTA Assistenza Territoriale ABSTRACT 53 Negative-pressure wound therapy (NPWT) is used to promote wound healing by using suction to drain excess fluid from wounds. A systematic literature review was undertaken to assess the effectiveness, safety and costeffectiveness of NPWT for the treatment of chronic wounds. Medline, Embase, CENTRAL, CINAHL and the Cochrane Wounds Group Specialised Trials Register were searched. A total of 9 randomized controlled trials (n=568) comparing NPWT with conventional wound therapy and four economic evaluations identified through NHS EED database were included. Five trials showed significant differences in favour of NPWT in primary outcome measures; however, most studies had small sample sizes and low scientific validity. Complications and adverse effects of NPWT are scarce compared to those of conventional treatment. There is no conclusive scientific evidence on the effectiveness and cost-effectiveness of NPWT in the treatment of chronic wounds and therefore its widespread use is not justified. La Terapia a Pressione Negativa (TPN) TABELLA 34. ANNO 2010 – METANALISI – RI. BIBLIOGRAFICO N° 250 Trattamento delle lesioni cutanee, acute e croniche, mediante utilizzo della terapia a pressione negativa FONTE http://www.asplazio.it/asp_online/prev_for_d oc/files/valutazione_HTA/Report_TNP10_09_10 .pdf AUTORI Agenzia di Sanità Pubblica Regione Lazio Report N. 1 – HTA Assistenza Territoriale ABSTRACT 54 Sono stati trovati 19 trial controllati, di cui 13 utili per valutare gli outcome considerati per un totale di 893 pazienti. Sebbene rimangano alcuni limiti metodologici nella letteratura analizzata (in particolare disomogeneità delle procedure terapeutiche utilizzate nei gruppi di controllo e di trattamento, follow-up breve, disomogeneità nella definizione degli outcomes, disomogeneità nell'inclusione dei pazienti) dalla nostra metanalisi dei dati risultano sufficienti evidenze di efficacia della terapia a pressione negativa nel ridurre il tempo di guarigione (MD=-11,52 giorni; IC95%[- 20,15;-2,88]) e nell‟aumentare la proporzione di ferite guarite (RR=1,40; IC95%[1,14;1,72]); per il tempo di preparazione al trattamento chirurgico si ha una riduzione di 5.7 giorni con significatività borderline (MD=-5,74; IC95%[-12,43;0,96]). In particolare si hanno evidenze di efficacia della terapia a pressione negativa: 1. per ferite acute post chirurgiche difficili (sterno e addome aperto) o con particolari fattori di rischio per la cronicizzazione (amputazione del piede diabetico); 2. come seconda linea di trattamento, per lesioni cutanee croniche difficili ad eccezione delle ulcere da pressione. Le evidenze disponibili per il trattamento delle ulcere da pressione, seppure basate su studi poco potenti, al momento sono di eguale efficacia rispetto alle terapie standard. La Terapia a Pressione Negativa (TPN) TABELLA 35. ANNO 2011 – METANALISI – RIF. BIBLIOGRAFICO N° 298 Negative-pressure therapy versus standard wound care: a meta-analysis of randomized trials. FONTE Plast Reconstr Surg. 2011 Nov;128(5):498e503e. AUTORI Suissa D, Danino A, Nikolis A. Report N. 1 – HTA Assistenza Territoriale ABSTRACT 55 Several randomized controlled trials comparing negative-pressure therapy to standard wound care for chronic wounds have been published. Although these studies suggest a benefit for negative-pressure therapy, the majority of the review articles on the topic conclude that the studies are inconclusive. The authors conducted a quantitative meta-analysis of the effectiveness of negative-pressure therapy for the management of chronic wounds. The MEDLINE, EMBASE, and Cochrane databases were searched from 1993 to March of 2010 for randomized controlled trials comparing negative-pressure therapy to standard wound care for chronic wounds. Measures of wound size and time to healing, along with the corresponding p values, were extracted from the randomized controlled trials. Relative change ratios of wound size and ratios of median time to healing were combined using a random effects model for meta-analysis. Ten trials of negative-pressure therapy versus standard wound care were found. In the negative-pressure therapy group, wound size had decreased significantly more than in the standard wound care group (relative change ratio, 0.77; 95 percent confidence interval, 0.63 to 0.96). Time to healing was significantly shorter in the negative-pressure therapy group in comparison with the standard wound care group (ratio of median time to healing, 0.74; 95 percent confidence interval, 0.70 to 0.78). This quantitative meta-analysis of randomized trials suggests that negative-pressure therapy appears to be an effective treatment for chronic wounds. An effect of publication bias cannot be ruled out. La Terapia a Pressione Negativa (TPN) TABELLA 36. ANNO 2011 – METANALISI – RIF. BIBLIOGRAFICO N° 62 Vacuum-assisted closure therapy for patients with infected sternal wounds: a meta-analysis of current evidence. FONTE J Plast Reconstr Aesthet Surg. 2011 Sep;64(9):1119-23. Epub 2011 Jan 22. AUTORI Damiani G, Pinnarelli L, Sommella L, Tocco MP, Marvulli M, Magrini P, Ricciardi W. Report N. 1 – HTA Assistenza Territoriale ABSTRACT 56 Acute and chronic wound infections are the main reasons for the observed increase in mortality rate and represent a significant risk factor in hospitalisation. From the patient's perspective, wound therapy is an uncomfortable, painful and long-term treatment. Modern sternal-wound-treatment systems would be expected to shorten wound healing and hospital stay periods. Vacuum-assisted closure (VAC) therapy is a system that promotes wound healing through the application of negative pressure by controlled suction to the wound surface. The application of controlled levels of negative pressure accelerates healing in many types of wounds. There are a number of scientific publications that have used meta-analysis to compare VAC and traditional therapy, considering changes in wound size. This article surveys the research literature focussing on the management of wound infections. The objective of this study is to assess the impact of VAC compared with conventional therapy on length of stay (LOS) and mortality. Six articles were selected that included a total of 321 patients (169 for VAC therapy and 152 for conventional therapy). The meta-analysis showed that VAC therapy resulted in a decrease of 7.18 days in hospital LOS (confidence interval (CI) 95%: 10.82, 3.54), with no significant impact on mortality. Our data provide robust evidence of the effectiveness of VAC therapy. La Terapia a Pressione Negativa (TPN) TABELLA 37. ANNO 2011 – EBR – RIF. BIBLIOGRAFICO N° 318 Evidence-based recommendations for the use of negative pressure wound therapy in chronic wounds: steps towards an international consensus FONTE J Tissue Viability. 2011 Dec;20 Suppl 1:S1-18. Epub 2011 Nov 25 AUTORI Vig S, Dowsett C, Berg L Report N. 1 – HTA Assistenza Territoriale ABSTRACT 57 Negative Pressure Wound Therapy (NPWT) has become widely adopted over the last 15 years and over 1000 peer-reviewed publications are available describing its use. Despite this, there remains uncertainty regarding several aspects of usage. In this communication the results of the study of evidence in chronic wounds including pressure ulcers, diabetic foot ulcers (DFU), venous leg ulcers (VLU), and ischaemic lower limb wounds are reported. Evidence-based recommendations were obtained by a systematic review of the literature, grading of evidence, drafting of the recommendations by a global expert panel followed by a formal consultative consensus development program in which 422 independent healthcare professionals were able to agree or disagree with the recommendations. The criteria for agreement were set at 80% agreement. Evidence and recommendations were graded according to the SIGN (Scottish Intercollegiate Guidelines Network) classification system. The primary treatment goal of NPWT in most chronic wounds is to achieve wound closure (either by secondary intention or preparing the wound for surgical closure). Secondary goals commonly include: to reduce wound dimensions, and to improve the quality of the wound bed. Thirteen evidence based recommendations were developed in total to address these treatment goals; 4 for pressure ulcers, 4 for DFU, 3 for ischaemic lower limb wounds and 2 for VLU. The present evidence base is strongest for the use of NPWT in nonischaemic DFU and weakest in VLU. The development of evidence-based recommendations for NPWT with direct validation from a large group of practicing clinicians offers a broader basis for consensus than work by an expert panel alone. La Terapia a Pressione Negativa (TPN) TABELLA 38. ANNO 2011 – REVISIONE – RIF. BIBLIOGRAFICO N° 230 Negative-pressure wound therapy: systematic review of randomized controlled trials. FONTE Dtsch Arztebl Int. 2011 Jun;108(22):381-9. Epub 2011 Jun 3 AUTORI Peinemann F, Sauerland S Report N. 1 – HTA Assistenza Territoriale ABSTRACT 58 We found reports of 9 RCTs in addition to the 12 covered by earlier IQWiG reviews of this topic. Five of the 9 new trials involved NPWT systems that are not on the market. The frequency of complete wound closure is stated in only 5 of the 9 new reports; a statistically significant effect in favor of NPWT was found in only two trials.The results of 8 of the 9 new trials are hard to interpret, both because of apparent bias and because diverse types of wounds were treated. Although there may be a positive effect of NPWT, we did not find clear evidence that wounds heal any better or worse with NPWT than with conventional treatment. Good RCTs are still needed to evaluate NPWT. La Terapia a Pressione Negativa (TPN) TABELLA 39. ANNO 2011 – EBR – RIF. BIBLIOGRAFICO N° 157 Evidence-based recommendations for the use of Negative Pressure Wound Therapy in traumatic wounds and reconstructive surgery: steps towards an international consensus. FONTE AUTORI Report N. 1 – HTA Assistenza Territoriale ABSTRACT 59 Injury. 2011 Feb;42 Suppl 1:S1-12. Krug E, Berg L Evidence-based recommendations were obtained by a systematic review of the literature, grading of evidence, drafting of the recommendations by a global expert panel, followed by a formal consultative consensus development program in which 422 independent healthcare professionals were able to agree or disagree with the recommendations. The criteria for agreement were set at 80% approval. Evidence and recommendations were graded according to the SIGN (Scottish Intercollegiate Guidelines Network) classification system. Twelve recommendations were developed in total; 4 for soft tissue trauma and open fracture injuries, 1 for burn injuries, 3 for flaps and 4 for skin grafts. The present evidence base is strongest for the use of NPWT on skin grafts and weakest as a primary treatment for burns. In the consultative process, 11/12 of the proposed recommendations reached the 80% agreement threshold. The development of evidence-based recommendations for NPWT with direct validation from a large group of practicing clinicians offers a broader basis for consensus than work by an expert panel alone. La Terapia a Pressione Negativa (TPN) Report N. 1 – HTA Assistenza Territoriale TABELLA 40. ANNO 2011 - STUDIO PRIMARIO – RIF. BIBLIOGRAFICO 323 60 Negative pressure wound therapy - a descriptive study. FONTE Ostomy Wound Manage. 2011 Jun;57(6):22-9. AUTORI Wallin AM, Boström L, Ulfvarson J, Ottosson C. To address a persistent lack of evidence regarding the clinical outcomes of negative pressure wound therapy (NPWT) and identify which patient groups are most likely to benefit from NPWT, a retrospective, descriptive study was conducted to describe outcomes of this treatment modality when used in clinical practice. Charts from a consecutive series of 87 patients (median age 68 years, range 16 - 92 years) who received NPWT during a period of 24 months were abstracted to a statistical software file. Patient demographics, history, and comorbidity variables as well as treatment outcomes were obtained from the computerized in- and outpatient record system. Treatment outcomes were grouped as successful (goal of care was met) or not successful (goal of care was not met). Successful treatment was noted for a total of 62 patients (71%) with a median treatment ABSTRACT time of 17 days. The proportion of patients with a successful outcome was significantly higher in patients with infectious, postoperative, and traumatic wounds than in patients with wounds related to peripheral vascular disease or pressure ulcers (P = 0.001). Treatment complications were observed in 18 patients (21%); five were related to infection. Quality-of-life concerns were noted as a reason for stopping treatment in four patients and equipment problems were recorded for two patients receiving NPWT in the home. This study confirms previous re- search that NPWT may be an effective and safe treatment method for acute wounds but further studies are needed to evaluate treatment efficacy and effectiveness in patients with peripheral vascular disease or pressure-induced wounds. Results also suggest that research protocols should include patient quality-oflife outcomes. La Terapia a Pressione Negativa (TPN) TABELLA 41. ANNO 2011 – STUDIO PRIMARIO – RIF. BIBLIOGRAFICO N° 329 Report N. 1 – HTA Assistenza Territoriale Economic evaluation of Vacuum Assisted Closure® Therapy for the treatment of diabetic foot ulcers in France. FONTE Int Wound J. 2011 Feb;8(1):22-32. Whitehead SJ, Forest-Bendien VL, Richard JL, AUTORI Halimi S, Van GH, Trueman P. The objective of the study was to assess the cost-effectiveness of Vacuum Assisted Closure® (V.A.C.®) Therapy compared with advanced wound care (AWC) for the treatment of diabetic foot ulcers (DFUs) in France. A cost-effectiveness model intended to reflect the management of DFUs was updated for the French setting. The Markov model follows the progression of 1000 hypothetical patients over a 1-year period. The model was populated with Frenchspecific data, obtained from published sources and clinical experts. The analysis evaluated costs and health outcomes, in terms of quality-adjusted life-years (QALYs), wounds healed and amputations, from the ABSTRACT perspective of the payer. The patients treated with V.A.C.® Therapy experienced more QALYs (0.787 versus 0.784) and improved healing rates (50.2% versus 48.5%) at a lower total cost of care (€24,881 versus €28,855 per patient per year) when compared with AWC. Sensitivity analyses conducted around key model parameters indicated that the results were affected by hospital resource use and costs. DFU treatment using V.A.C.® Therapy in France was associated with lower costs, additional QALYs, more healed ulcers and fewer amputations than treatment with AWC. V.A.C.® Therapy was therefore found to be the dominant treatment option. 61 La Terapia a Pressione Negativa (TPN) Report N. 1 – HTA Assistenza Territoriale TABELLA 42. ANNO 2011 – STUDIO PRIMARIO - RIF. BIBLIOGRAFICO N° 154 62 Vacuum assisted closure improves the quality of life in patients with diabetic foot. FONTE Acta Chir Belg. 2011 Sep-Oct;111(5):298-302. AUTORI Karatepe O, Eken I, Acet E. Diabetes Mellitus (DM) is the most common endocrine disease worldwide. One of the most important chronic complications of this disease is the development of diabetic foot. The management of diabetic foot wounds is quite important with respect to public health. To determine the effect of Vacuum Assisted Closure (VAC) therapy on the quality of life in the treatment of diabetic foot ulcers and compare it with standart wound care. Between May 2007 to December 2008, 67 consecutive patients with diabetic foot ulcers were randomly assigned to VAC therapy (Group 1, n : 30) or standart wound care (Group 2, n : 37). The SF-36 questionnaire was administered the day before and in the month following wound healing. Global analyses of the 8 domains and 2 comprehensive indexes of SF-36, Physical Component Summary (PCS) and Mental ABSTRACT Component Summary (MCS) were performed. Clinical measures included standard antidiabetic treatment, daily wound care including antiseptic bath, debridement, toe removal for gangrene when necessary, and wound care with conventional methods or VAC. Healing time was calculated as the time from hospital admission to the time of re-epithelization. There were no differences in the mean age, ulcer size and pulse status of the patients in both groups. Healing time in the VAC group was significantly reduced (p < 0.05). All 8 domains of SF-36 and MCS and PCS scores improved remarkably after VAC therapy. Vacuum Assisted Closure therapy was found to be effective in the treatment of chronic diabetic ulcers. The improvement of quality of life demonstrates a clear-cut indication in this particular group of patients. La Terapia a Pressione Negativa (TPN) TABELLA 43. ANNO 2011 – STUDIO PRIMARIO – RIF. BIBLIOGRAFICO N° 234 Report N. 1 – HTA Assistenza Territoriale A prospective randomized controlled trial comparing negative pressure dressing and conventional dressing methods on splitthickness skin grafts in burned patients. FONTE Burns. 2011 Sep;37(6):925-9. Epub 2011 Jul 1. AUTORI Petkar KS, Dhanraj P, Kingsly PM, A total of 40 split-skin grafts were put on 30 patients. The grafted wounds included acute and chronic burns wounds and surgically created raw areas during burn reconstruction. Twenty-one of them received NPD and 19 served as controls. Patient profiles and average size of the grafts were comparable between the two groups. The vacuum closure assembly was well tolerated by all patients. Final graft take at nine days in the study group ranged from 90 to 100 per cent with an average of 96.7 per cent (SD: 3.55). The control group showed a graft take ABSTRACT ranging between 70 and 100 percent with an average graft take of 87.5 percent (SD: 8.73). Mean duration of continued dressings on the grafted area was 8 days in cases (SD: 1.48) and 11 days in controls (SD: 2.2) after surgery. Each of these differences was found to be statistically significant (p<0.001). Negative pressure dressing improves graft take in burns patients and can particularly be considered when wound bed and grafting conditions seem less-than-ideal. The negative pressure can also be effectively assembled using locally available materials thus significantly reducing the cost of treatment. 63 La Terapia a Pressione Negativa (TPN) Report N. 1 – HTA Assistenza Territoriale TABELLA 44. ANNO 2011 – STUDIO PRIMARIO – RIF. BIBLIOGRAFICO N° 93 64 Vacuum-assisted therapy for various wound types including diabetic foot ulcer FONTE Harefuah. 2011 Mar;150(3):222-6, 306, 305. AUTORI Farah R, Gantus M, Kogan L. Vacuum is a noninvasive system that creates a localized controlled negative pressure environment. In this study, vacuum was provided by the V.A.C. Therapy system, which promotes wound healing by delayed primary or secondary intention through creating a moist wound environment, preparing the wound bed for closure, reducing edema, and promoting formation and perfusion of granulation tissue. Vacuumassisted closure therapy is indicated for use in all care settings and for a variety of wound types including diabetic foot ulcers. The purpose of this study was to evaluate safety and clinical efficacy of negative pressure wound therapy (NPWT) compared with advanced moist wound therapy and standard treatment to treat foot ulcers in diabetic patients. This trial enrolled 43 patients; most of them were diabetic patients at any age with various skin ulcers and diabetic foot. These patients were divided ABSTRACT into two groups, 17 patients were treated with vacuum and the 26 patients in the control group were treated with standard therapy including debridement. A greater proportion of foot and skin ulcers achieved complete ulcer closure with vacuum-assisted therapy p<0.001 compared with the standard therapy. Vacuum therapy significantly decreased the duration and frequency of admission p=0.032 and decreased the rate of amputation p<0.001. Results of our trial support other studies and demonstrate that vacuum is as safe as and more efficacious than standard therapy in the treatment of diabetic foot ulcers. A significantly greater number of patients achieved complete ulcer closure and granulation tissue formation with this therapy. The study group showed a significant reduction in the median time needed to heal ulcers, reduction of the number of admissions and amputation frequency. La Terapia a Pressione Negativa (TPN) TABELLA 45. ANNO 2012 – REVISIONE – RIF. BIBLIOGRAFICO N° 223 Negative pressure wound therapy literature review of efficacy, cost effectiveness, and impact on patients’ quality of life in chronic wound management and its implementation in the United Kingdom Plastic Surgery International FONTE AUTORI Report N. 1 – HTA Assistenza Territoriale ABSTRACT 65 Plastic Surgery International. Volume 2012 (2012), Article ID 374398, 6 pages Othman D. This is a paper reviewing the National Health Service (NHS) agenda in relation to the use of Negative Pressure Wound Therapy (NPWT) in chronic wound management and assesses the evidence behind it, its cost effectiveness and the outcome it has on patients' satisfaction and life style. Multiple studies over the last 10 years looking at clinical efficacy of NPWT with its cost effectiveness and the implementation of this service in the UK were reviewed. NPWT has showed a reasonable body of evidence to support its usage in chronic wounds with potential positive outcomes on finance and patients' satisfaction. However, the NHS system shows significant variations in the availability and implementation of this useful tool, depending on care providers and resources availabilities. The paper concluded that the NPWT can be a useful source of cutting down costs of chronic wound managements and saving money by its effect on expediting wound healing, which can address a part of the financial crises facing the NHS, however, has to be considered according to specific case needs. There should also be a national standard for the availability and indication of this tool to assure equal opportunities for different patients in different areas in the country. La Terapia a Pressione Negativa (TPN) TABELLA 46. ANNO 2012 – REVISIONE – RIF. BIBLIOGRAFICO N° 111 A systematic review of interventions to enhance the healing of chronic ulcers of the foot in diabetes FONTE AUTORI Report N. 1 – HTA Assistenza Territoriale ABSTRACT 66 Diabetes Metab Res Rev. 2012 Feb;28 Suppl 1:119-41. Game FL, Hinchliffe RJ, Apelqvist J, Armstrong DG, Bakker K, Hartemann A, Löndahl M, Price PE, Jeffcoate WJ. The present report is an update of the earlier IWGDF systematic review, but the conclusion is similar: that with the exception of HBOT and, possibly, negative pressure wound therapy, there is little published evidence to justify the use of newer therapies. This echoes the conclusion of a recent Cochrane review and the systematic review undertaken by the National Institute for Health and Clinical Excellence Guidelines Committee in the UK. Analysis of evidence presents considerable difficulties in this field particularly as controlled studies are few and the majority are of poor methodological quality. La Terapia a Pressione Negativa (TPN) TABELLA 47. ANNO 2012 – REVISIONE – RIF. BIBLIOGRAFICO N° 326 Report N. 1 – HTA Assistenza Territoriale Negative pressure wound therapy for skin grafts and surgical wounds healing by primary intention 67 FONTE Cochrane Database Syst Rev. 2012 Apr 18;4:CD009261. AUTORI Webster J, Scuffham P, Sherriff KL, Stankiewicz M, Chaboyer WP. ABSTRACT Evidence for the effectiveness of NPWT on complete healing of wounds expected to heal by primary intention remains unclear. Rates of graft loss may be lower when NPWT is used; but evidence to date suggests that hospital-based products are as effective in this area as commercial applications. There are clear cost benefits when non-commercial systems are used to create the negative pressure required for wound therapy, with no reduction in clinical outcome. Pain levels are also rated lower when hospital systems are compared with their commercial counterparts. The high incidence of blisters occurring when NPWT is used following orthopaedic surgery suggests that the therapy should be limited until safety in this population is established. Given the cost and widespread use of NPWT, there is an urgent need for suitably powered, high-quality trials to evaluate the effects of the newer NPWT products that are designed for use on clean, closed surgical incisions. Such trials should focus initially on wounds that may be difficult to heal, such as sternal wounds or surgeries for obese patients. La Terapia a Pressione Negativa (TPN) TABELLA 48. ANNO 2012 – REVISIONE – RIF. BIBLIOGRAFICO N° 266 Negative pressure therapy: theory and practice. FONTE AUTORI Report N. 1 – HTA Assistenza Territoriale ABSTRACT 68 Diabetes Metab Res Rev. 2012 Feb;28 Suppl 1:72-7. Schintler MV Systematic analysis of the data shows efficacy concerning induction of wound healing mechanisms, especially in the early stage. Increased perfusion can be considered proven. Data analysis shows positive efficacy for treatment of infection. Although this therapy appears effective and its superiority to conventional techniques has been demonstrated, there are still some critical votes concerning efficacy. Because its mechanisms of action remain unclear, and because there is still some gap between evidence-based data and the excellent clinical results, further prospective, randomized, blinded studies are needed. Even so, we conclude that vacuum therapy, used when indicated and especially by experienced surgeons, is an excellent tool to support wound healing. La Terapia a Pressione Negativa (TPN) Report N. 1 – HTA Assistenza Territoriale BIBLIOGRAFIA GENERALE 69 1. Adamkova M, Tymonova J, Zamecnikova I, Kadlcik M, Klosova H. First experience with the use of vacuum assisted closure in the treatment of skin defects at the Burn Center. Acta Chir Plast 2005;47(1):24-7. 2. Agarwal JP, Ogilvie M, Wu LC, Lohman RF, Gottlieb LJ, Franczyk M, et al. 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