{"id":2650,"date":"2021-01-13T11:46:18","date_gmt":"2021-01-13T11:46:18","guid":{"rendered":"https:\/\/www.q-bital.com\/?p=2650"},"modified":"2021-01-13T11:46:18","modified_gmt":"2021-01-13T11:46:18","slug":"why-the-rate-of-air-changes-in-theatres-matter","status":"publish","type":"post","link":"https:\/\/www.q-bital.com\/sv_se\/why-the-rate-of-air-changes-in-theatres-matter\/","title":{"rendered":"Varf\u00f6r hastigheten av luftf\u00f6r\u00e4ndringar p\u00e5 teatrar spelar roll"},"content":{"rendered":"<p>Eftersom den planerade operationen har \u00e5terupptagits i l\u00e4nder som Australien och Nya Zeeland, \u00e4r \u00f6verf\u00f6ringsbaserade f\u00f6rsiktighets\u00e5tg\u00e4rder fortfarande avg\u00f6rande f\u00f6r att minimera risker och s\u00e4kerst\u00e4lla att procedurer forts\u00e4tter. Men graden av luftv\u00e4xlingar som \u00e4r m\u00f6jliga p\u00e5 operationssalar \u00e4r ocks\u00e5 en nyckelfaktor.<\/p>\n<p>Bortsett fr\u00e5n att minska risken f\u00f6r infektion, kan den tid som kr\u00e4vs f\u00f6r att aerosoler ska avl\u00e4gsnas fr\u00e5n kliniska utrymmen med ventilationssystem ha en betydande inverkan p\u00e5 tiden som beh\u00f6vs mellan kirurgiska och diagnostiska ingrepp, och d\u00e4rmed effektivitetsniv\u00e5erna i operationssalar och ingreppsrum.<\/p>\n<p><strong>Minimera risken<\/strong><\/p>\n<p>Riskfaktorer med potential att p\u00e5verka \u00f6verf\u00f6ring av infektion i teatrar inkluderar sannolikheten f\u00f6r att patienter har Covid-19 i f\u00f6rsta hand, vilket i sin tur beror p\u00e5 tillr\u00e4ckligheten och effektiviteten av isolering och f\u00f6rscreening av patienter, s\u00e5v\u00e4l som allm\u00e4n prevalens av viruset och \u00f6verf\u00f6ringshastigheterna f\u00f6r samh\u00e4llet.<\/p>\n<p>Riskniv\u00e5n n\u00e4r man utf\u00f6r elektiv kirurgi och diagnostiska procedurer \u00e4r ocks\u00e5 beroende av lokal efterlevnad av relevanta f\u00f6rsiktighets\u00e5tg\u00e4rder f\u00f6r infektionskontroll, s\u00e5som patientf\u00f6rberedelse, handtv\u00e4tt och anv\u00e4ndning av l\u00e4mplig personlig skyddsutrustning.<\/p>\n<p>Men \u00e4ven d\u00e4r en rad \u00e5tg\u00e4rder vidtas f\u00f6r att s\u00e4kert komma in i icke-Covid-v\u00e4gen, s\u00e5som sj\u00e4lvisolering, screening f\u00f6r fr\u00e5nvaro av symtom, f\u00f6rh\u00f6jd kroppstemperatur och negativa antigentester f\u00f6re intagning, kvarst\u00e5r fortfarande en viss riskniv\u00e5. F\u00f6r att ytterligare minska denna risk kr\u00e4vs ytterligare f\u00f6rsiktighets\u00e5tg\u00e4rder f\u00f6r att s\u00e4kerst\u00e4lla att infektion inte \u00f6verf\u00f6rs genom luften.<\/p>\n<p>Luftfiltreringssystem i operationssalar minskar risken f\u00f6r infektion fr\u00e5n luftburna partiklar. Minimistandarder \u00e4r likartade i m\u00e5nga l\u00e4nder eftersom de \u00e4r baserade p\u00e5 internationella rekommendationer, men inte n\u00f6dv\u00e4ndigtvis desamma.<\/p>\n<p>Det australiensiska minimikravet f\u00f6r en operationssal beskrivs som standard <a href=\"https:\/\/infostore.saiglobal.com\/en-au\/standards\/as-1668-2-2012-120207_saig_as_as_251941\/\">AS1668 del 2<\/a>, enligt beskrivningen av bygglagen i Australien. De viktigaste kraven \u00e4r att luften som kommer in i salen m\u00e5ste passera genom ett HEPA-filter, och en minsta luftv\u00e4xlingshastighet (ACH) p\u00e5 20 luftbyten per timme kr\u00e4vs. Luften b\u00f6r ocks\u00e5 ha ett positivt tryck mot omgivande omr\u00e5den.<\/p>\n<p>HEPA-filtret s\u00e4kerst\u00e4ller att luften som tillf\u00f6rs teatern \u00e4r ren, luftv\u00e4xlingarna s\u00e4kerst\u00e4ller att frisk luft tillf\u00f6rs i en m\u00e4ngd som \u00e4r tillr\u00e4cklig f\u00f6r att sp\u00e4da ut partiklar i rummet till en l\u00e4mplig niv\u00e5, medan det positiva trycket s\u00e4kerst\u00e4ller att luften som kommer in i salen g\u00f6r det i en kontrollerat s\u00e4tt.<\/p>\n<h4><strong>Aerosolgenererande procedurer (AGP)<\/strong><\/h4>\n<p>F\u00f6rb\u00e4ttrade luftburna f\u00f6rsiktighets\u00e5tg\u00e4rder beh\u00f6vs n\u00e4r en <a href=\"https:\/\/www.cec.health.nsw.gov.au\/__data\/assets\/pdf_file\/0006\/596301\/AGPs-in-relation-to-COVID-19.pdf\">aerosolgenererande procedur<\/a> (AGP) utf\u00f6rs p\u00e5 en patient som \u00e4r k\u00e4nd f\u00f6r att vara infekterad med Covid-19 eller f\u00f6r vilken Covid-19-statusen \u00e4r ok\u00e4nd, eller en procedur genomf\u00f6rs p\u00e5 en &quot;hotspot&quot;-plats. Som ett minimum b\u00f6r personlig skyddsutrustning f\u00f6r personal p\u00e5 teatrar d\u00e4r aerosolgenererande procedurer utf\u00f6rs inneh\u00e5lla en v\u00e4tskebest\u00e4ndig kirurgisk mask f\u00f6r att minimera risken f\u00f6r droppspridning.<\/p>\n<p>Aerosolgenererande procedurer kan delas in i respiratoriska och kirurgiska AGPs, med kirurgiska AGPs som vanligtvis har l\u00e4gre inneboende risk, \u00e4ven om de kan generera aerosoler under l\u00e4ngre perioder. Exempel p\u00e5 vanliga AGP \u00e4r intubation, extuberande, trakeostomirelaterade ingrepp, icke-invasiv ventilation, bronkoskopi, \u00f6vre gastrointestinala endoskopi och vissa tandingrepp.<\/p>\n<p>Hur m\u00e5nga luftbyten som kr\u00e4vs f\u00f6r en operationssal beror p\u00e5 vilken typ av operation som g\u00f6rs i den och vilka riktlinjer den beh\u00f6ver f\u00f6lja. Olika stater i Australien har n\u00e5got <a href=\"https:\/\/www.health.nsw.gov.au\/Infectious\/covid-19\/communities-of-practice\/Pages\/guide-resuming-elective-surgery.aspx\">olika riktlinjer<\/a>, \u00e4ven om de p\u00e5 det hela taget \u00f6verensst\u00e4mmer med nationella och internationella standarder.<\/p>\n<h4><strong>Aerosol Clearance Times (ACTs)<\/strong><\/h4>\n<p>Medan en standardoperationssal m\u00e5ste ha 20 luftv\u00e4xlingar per timme, \u00f6verskrids denna hastighet regelbundet och salar med lamin\u00e4rt fl\u00f6de tenderar att ha en mycket h\u00f6gre hastighet \u00e4n s\u00e5. Lamin\u00e4ra fl\u00f6dessystem g\u00f6r att luftfl\u00f6det kan kontrolleras mer strikt \u00f6ver operationsomr\u00e5det.<\/p>\n<p>Allm\u00e4nt accepterad <a href=\"https:\/\/www.cdc.gov\/infectioncontrol\/guidelines\/environmental\/appendix\/air.html#tableb1\">internationella riktlinjer<\/a> se data som indikerar att varje luftbyte tar bort cirka 63% luftburna f\u00f6roreningar, med &gt;99% som avl\u00e4gsnas efter fem luftbyten. \u00c4ven om det finns begr\u00e4nsade bevis f\u00f6r att st\u00f6dja denna ber\u00e4kningsmetod anv\u00e4nds den i stor utstr\u00e4ckning. Baserat p\u00e5 detta antagande \u00e5terst\u00e5r endast 0,004% av de cirkulerande aerosolarna efter 10 utbyten.<\/p>\n<p>Hur l\u00e5ng tid ett visst antal luftbyten tar att utf\u00f6ra beror p\u00e5 ventilationssystemet i teatern, rummet eller byggnaden som anv\u00e4nds. <a href=\"https:\/\/associationofanaesthetists-publications.onlinelibrary.wiley.com\/doi\/full\/10.1111\/anae.15146#anae15146-bib-0001\">Utr\u00e4kningen<\/a> f\u00f6r &#039;aerosol clearance time&#039; (ACT) - tiden det tar i minuter f\u00f6r ett luftbyte i ett rum - \u00e4r 60 dividerat med antalet luftbyten per timme som m\u00e4ts eller uppskattas f\u00f6r det rummet. Den resulterande tiden i minuter multipliceras sedan med antalet luftbyten som kr\u00e4vs.<\/p>\n<p>Generiska riktlinjer och rekommendationer b\u00f6r dock anv\u00e4ndas med f\u00f6rsiktighet. I verkligheten beror aerosolrensningstider p\u00e5 rummets egenskaper och \u00e4r platsspecifika. F\u00f6r att r\u00e4kna ut aerosolrensningstiden f\u00f6r ett enskilt rum eller teater m\u00e5ste sjukv\u00e5rden k\u00e4nna till luftv\u00e4xlingskurserna f\u00f6r varje teaterplats. Medan de flesta operationssalar har en h\u00f6g ventilationshastighet per timme, kan detta variera och ventilationshastigheter m\u00e4ts med j\u00e4mna mellanrum \u00f6ver tiden.<strong>&#160;<\/strong><\/p>\n<h4><strong>Klartid mellan procedurerna<\/strong><\/h4>\n<p>A <a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/anae.15146\">brev utgivet av Narkosl\u00e4karf\u00f6rbundet<\/a> i juni f\u00f6reslog att en aerosolclearance time (ACT) lika med den tid det tar f\u00f6r fem luftbyten att cykla igenom - m\u00e4tt f\u00f6r en viss teater - b\u00f6r l\u00e4mnas mellan procedurerna f\u00f6r att m\u00f6jligg\u00f6ra tillr\u00e4cklig aerosolclearning. Denna rekommendation h\u00e4nvisas ofta till, men uppskattningar fr\u00e5n andra k\u00e4llor str\u00e4cker sig fr\u00e5n tv\u00e5 ACTs upp till 10-15 ACTs.<\/p>\n<p>Baserat p\u00e5 antagandet att det kr\u00e4vs fem luftbyten mellan procedurerna, skulle en standardoperationssal med 20 luftbyten per timme beh\u00f6va en 15 minuters rensningstid. Lamin\u00e4rt fl\u00f6de teaterventilationssystem kan ha ett mycket h\u00f6gre antal luftbyten per timme, vilket inneb\u00e4r att det kr\u00e4vs kortare tid mellan procedurerna.<\/p>\n<p>Det \u00e4r upp till varje v\u00e5rdgivare att best\u00e4mma sin egen policy n\u00e4r det g\u00e4ller vilken luftbytesfrekvens som \u00e4r acceptabel f\u00f6r s\u00e4ker rensning av aerosoler, baserat p\u00e5 deras k\u00e4nda luftv\u00e4xlingshastigheter i kliniska omr\u00e5den. \u00c4ven om typiska intervall f\u00f6r olika typer av anl\u00e4ggningar \u00e4r tillg\u00e4ngliga, kan anv\u00e4ndning av uppskattningar snarare \u00e4n h\u00e5rda data vara kopplade till risk.<\/p>\n<p>Dessutom, f\u00f6r Covid-positiva patienter eller patienter vars Covid-status \u00e4r ok\u00e4nd, kan undertryck kr\u00e4vas f\u00f6r att minska risken f\u00f6r infektion utanf\u00f6r teatermilj\u00f6n.<\/p>\n<p><strong>F\u00f6rb\u00e4ttring av teatertiden<\/strong><\/p>\n<p>Oavsett hur m\u00e5nga luftbyten ett sjukhus har mellan procedurerna, r\u00e5der det ingen tvekan om att den policy som varje sjukhus beslutar om kan ha betydande konsekvenser f\u00f6r teaterproduktiviteten. En minskning av tiden det tar f\u00f6r varje luftbyte, och d\u00e4rmed v\u00e4ntetider p\u00e5 teatern, kan leda till effektivitetsvinster och direkt p\u00e5verka hur m\u00e5nga patienter som kan behandlas p\u00e5 en dag.<\/p>\n<p>Ju h\u00f6gre luftfl\u00f6den och antalet luftbyten per timme som \u00e4r m\u00f6jliga i ett rum eller en teater, desto snabbare <a href=\"https:\/\/bjanaesthesia.org\/article\/S0007-0912(20)30853-9\/fulltext\">aerosoler kan rensas<\/a>, och desto snabbare kan handl\u00e4ggningstiderna f\u00f6r patienten vara. \u00c4ven om skillnaden och tiden som sparas mellan varje ingrepp kan tyckas vara liten, kan det g\u00f6ra en avsev\u00e4rd skillnad \u00f6ver antalet ingrepp som g\u00f6rs p\u00e5 en dag eller en vecka, vilket i slut\u00e4ndan minskar patientens v\u00e4ntetider f\u00f6r planerade kirurgiska och diagnostiska ingrepp.<\/p>\n<p>Mobila och modul\u00e4ra operationssalar representerar mycket kontrollerade milj\u00f6er, vilket underl\u00e4ttar ber\u00e4kningen av antalet luftbyten som kr\u00e4vs i varje enskilt fall. F\u00f6rutom att l\u00e4gga till kapacitet f\u00f6r att minska v\u00e4ntelistorna kan dessa enheter i vissa fall erbjuda ett h\u00f6gre antal luftbyten per timme \u00e4n sjukhusets interna anl\u00e4ggningar, vilket \u00f6kar genomstr\u00f6mningen ytterligare.<\/p>\n<p>Q-bital <a href=\"\/sv_se\/facilities\/operating-rooms\/\">mobila operationssalar<\/a> och <a href=\"\/sv_se\/facilities\/endoscopy\/\">endoskopi sviter<\/a> erbjuda HEPA-filtrerad milj\u00f6luft med upp till 30 friskluftsbyten per timme som passerar \u00f6ver patienten, medan en <a href=\"\/sv_se\/facilities\/operating-rooms\/\">mobil lamin\u00e4rfl\u00f6desteater<\/a> kan utf\u00f6ra upp till 60 luftbyten per timme i teaterrummet.<\/p>","protected":false},"excerpt":{"rendered":"<p>Eftersom den planerade operationen har \u00e5terupptagits i l\u00e4nder som Australien och Nya Zeeland, \u00e4r \u00f6verf\u00f6ringsbaserade f\u00f6rsiktighets\u00e5tg\u00e4rder fortfarande avg\u00f6rande f\u00f6r att minimera risker och s\u00e4kerst\u00e4lla att procedurer forts\u00e4tter. Men graden av luftv\u00e4xlingar som \u00e4r m\u00f6jliga p\u00e5 operationssalar \u00e4r ocks\u00e5 en nyckelfaktor.<\/p>","protected":false},"author":1,"featured_media":1307,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,119],"tags":[136,5,4,135,125],"class_list":["post-2650","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-products-and-services","tag-australia","tag-mobile","tag-modular","tag-new-zealand","tag-operating-theatre"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why the rate of air changes in theatres matter - Q-bital Healthcare Solutions<\/title>\n<meta name=\"description\" content=\"As well as transmission-based precautions, the rate of air changes possible in operating theatres is also a key factor in minimising risk\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.q-bital.com\/sv_se\/why-the-rate-of-air-changes-in-theatres-matter\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why the rate of air changes in theatres matter - 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