{"id":3619,"date":"2021-01-20T10:16:56","date_gmt":"2021-01-20T10:16:56","guid":{"rendered":"\/?p=3619"},"modified":"2021-01-20T10:16:56","modified_gmt":"2021-01-20T10:16:56","slug":"the-importance-of-air-changes","status":"publish","type":"post","link":"https:\/\/www.vanguardhealthcare.co.uk\/da_dk\/the-importance-of-air-changes\/","title":{"rendered":"Betydningen af luft\u00e6ndringer"},"content":{"rendered":"<p>Da den planlagte operation forts\u00e6tter p\u00e5 hospitaler, sidel\u00f8bende med behandlingen af Covid-19-patienter, er transmissionsbaserede forholdsregler fortsat afg\u00f8rende for at minimere risikoen og sikre, at procedurer g\u00e5r videre. Men hastigheden af mulige luftskift p\u00e5 operationsstuer er ogs\u00e5 en n\u00f8glefaktor.<\/p>\n<p>Udover at reducere risikoen for infektion, kan den tid, der kr\u00e6ves for aerosoler at blive fjernet fra kliniske omr\u00e5der af ventilationssystemer, have en v\u00e6sentlig indflydelse p\u00e5 den n\u00f8dvendige tid mellem kirurgiske og diagnostiske procedurer og dermed effektivitetsniveauet i operationsstuer og procedurerum.<\/p>\n<p><strong>Minimering af risiko<\/strong><\/p>\n<p>Risikofaktorer med potentiale til at p\u00e5virke overf\u00f8rsel af infektion i teatre omfatter sandsynligheden for, at patienter har Covid-19 i f\u00f8rste omgang, hvilket igen afh\u00e6nger af tilstr\u00e6kkeligheden og effektiviteten af isolering og pr\u00e6-screening af patienter, samt generel udbredelse af virus og samfundsoverf\u00f8rselshastigheder.<\/p>\n<p>Risikoniveauet ved udf\u00f8relse af elektiv kirurgi og diagnostiske procedurer afh\u00e6nger ogs\u00e5 af lokal overholdelse af relevante infektionskontrolforanstaltninger, s\u00e5som patientforberedelse, h\u00e5ndvask og brug af passende PPE.<\/p>\n<p>Men selv hvor der tr\u00e6ffes en r\u00e6kke foranstaltninger for sikker adgang til ikke-Covid-vejen, s\u00e5som selvisolering, screening for frav\u00e6r af symptomer, forh\u00f8jet kropstemperatur og negative antigentest f\u00f8r indl\u00e6ggelse, er der stadig en vis risiko. For yderligere at reducere denne risiko er der behov for yderligere forholdsregler for at sikre, at infektion ikke overf\u00f8res gennem luften.<\/p>\n<p>Luftfiltreringssystemer i operationsstuer reducerer risikoen for infektion fra luftb\u00e5rne partikler. HEPA-filteret sikrer, at luften, der tilf\u00f8res biografen er ren, luftskiftene sikrer, at der tilf\u00f8res frisk luft i en m\u00e6ngde, der er tilstr\u00e6kkelig til at fortynde partikler i rummet til et passende niveau, mens det positive tryk sikrer, at luften, der kommer ind i biografen, g\u00f8r det i en kontrolleret m\u00e5de.<\/p>\n<h4><strong>Aerosol-genererende procedurer (AGP&#039;er)<\/strong><\/h4>\n<p>Forst\u00e6rkede luftb\u00e5rne forholdsregler er n\u00f8dvendige, n\u00e5r en aerosol-genererende procedure (AGP) udf\u00f8res p\u00e5 en patient, der vides at v\u00e6re inficeret med Covid-19, eller hvis Covid-19-status er ukendt, eller en procedure udf\u00f8res p\u00e5 et &quot;hotspot&quot;-sted, som defineret af <a href=\"https:\/\/www.gov.uk\/government\/publications\/wuhan-novel-coronavirus-infection-prevention-and-control\/covid-19-personal-protective-equipment-ppe#ppe-guidance-by-healthcare-context\">Public Health England (PHE) vejledning<\/a>.<\/p>\n<p>PHE definerer i \u00f8jeblikket enhver operationsstue, hvor aerosolgenereringsprocedurer regelm\u00e6ssigt udf\u00f8res som et &quot;hotspot&quot;-sted eller <a href=\"https:\/\/www.gov.uk\/government\/publications\/wuhan-novel-coronavirus-infection-prevention-and-control\/covid-19-personal-protective-equipment-ppe#ppe-guidance-by-healthcare-context\">h\u00f8jere risiko akut omr\u00e5de<\/a>. Som minimum b\u00f8r PPE til personale i teatre, hvor der udf\u00f8res aerosol-genererende procedurer, omfatte en v\u00e6skeresistent kirurgisk maske for at minimere risikoen for dr\u00e5bespredning.<\/p>\n<p><a href=\"https:\/\/www.gov.uk\/government\/publications\/wuhan-novel-coronavirus-infection-prevention-and-control\/covid-19-infection-prevention-and-control-guidance-aerosol-generating-procedures\">Aerosol-genererende procedurer<\/a> kan opdeles i respiratoriske og kirurgiske AGP&#039;er, hvor kirurgiske AGP&#039;er generelt sandsynligvis har lavere iboende risiko, selvom de kan generere aerosoler i l\u00e6ngere perioder. Eksempler p\u00e5 almindelige AGP&#039;er er intubation, ekstubering, trakeostomi-relaterede procedurer, non-invasiv ventilation, bronkoskopi, \u00f8vre gastrointestinale endoskopi og visse tandbehandlinger.<\/p>\n<p>Hvor mange luftskift, der kr\u00e6ves til en operationsstue, afh\u00e6nger af den type operation, der udf\u00f8res i den, og de retningslinjer, den skal overholde.<\/p>\n<h4><strong>Aerosol Clearance Times (ACTs)<\/strong><\/h4>\n<p>Mens en standard operationsstue skal have 20 luftudskiftninger i timen, overskrides denne hastighed regelm\u00e6ssigt, og lamin\u00e6re flow biografer har en tendens til at have en meget h\u00f8jere hastighed end det. Lamin\u00e6re flowsystemer g\u00f8r det muligt at kontrollere luftstr\u00f8mmen t\u00e6ttere p\u00e5 tv\u00e6rs af operationsomr\u00e5det.<\/p>\n<p>Alment accepteret <a href=\"https:\/\/www.cdc.gov\/infectioncontrol\/guidelines\/environmental\/appendix\/air.html#tableb1\">internationale retningslinjer<\/a> henvise til data, der indikerer, at hvert luftskifte fjerner ca. 63% luftb\u00e5rne forurenende stoffer, hvor &gt;99% fjernes efter fem luftskift. Baseret p\u00e5 denne antagelse er der kun 0,004% tilbage af de cirkulerende aerosoler efter 10 ombytninger. Selvom der er begr\u00e6nset dokumentation for at underst\u00f8tte denne beregningsmetode, er den meget brugt, og PHE-vejledningen henviser til den.<\/p>\n<p>Hvor lang tid det tager at udf\u00f8re et bestemt antal luftskift afh\u00e6nger af ventilationssystemet i det anvendte teater, rum eller bygning. <a href=\"https:\/\/associationofanaesthetists-publications.onlinelibrary.wiley.com\/doi\/full\/10.1111\/anae.15146#anae15146-bib-0001\">Regnestykket<\/a> for &#039;aerosol clearance time&#039; (ACT) - den tid det tager i minutter for et luftskifte i et rum - er 60 divideret med antallet af luftskift pr. time m\u00e5lt eller estimeret for det p\u00e5g\u00e6ldende rum. Den resulterende tid i minutter ganges derefter med antallet af n\u00f8dvendige luftskift.<\/p>\n<p>Generiske retningslinjer og anbefalinger b\u00f8r dog bruges med forsigtighed. I virkeligheden afh\u00e6nger aerosolens clearance-tider af rummets karakteristika og er placeringsspecifikke. For at beregne aerosolrydningstiden for et enkelt lokale eller teater skal sundhedsv\u00e6senet kende luftudvekslingerne for hvert teatersted. Mens de fleste operationsstuer har en h\u00f8j ventilationshastighed, generelt ved 20 eller flere luftskift i timen, kan dette variere, og der er en <a href=\"https:\/\/assets.publishing.service.gov.uk\/government\/uploads\/system\/uploads\/attachment_data\/file\/144029\/HTM_03-01_Part_A.pdf\">lovkrav<\/a> for ventilationshastigheder, der skal m\u00e5les hver 14. m\u00e5ned.<strong>&#160;<\/strong><\/p>\n<h4><strong>Klareringstid mellem procedurer<\/strong><\/h4>\n<p>EN <a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/anae.15146\">brev udgivet af An\u00e6stesiforeningen<\/a> i juni foreslog, at en aerosolclearance-tid (ACT) svarende til den tid, det tager for fem luftskift at cykle igennem - m\u00e5lt for et bestemt teater - skulle efterlades mellem procedurerne for at tillade tilstr\u00e6kkelig aerosolclearance. Denne anbefaling omtales almindeligvis, men sk\u00f8n fra andre kilder sp\u00e6nder fra to ACT&#039;er op til 10-15 ACT&#039;er.<\/p>\n<p>Baseret p\u00e5 antagelsen om, at der kr\u00e6ves fem luftskift mellem procedurerne, ville en standard operationsstue med 20 luftskift i timen have brug for en 15-minutters klaringstid. Laminar flow teater ventilationssystemer kan have et meget h\u00f8jere antal luftskift i timen, hvilket betyder, at der kr\u00e6ves kortere tid mellem procedurerne.<\/p>\n<p>Det er op til hver enkelt sundhedsudbyder at beslutte sin egen politik med hensyn til, hvilken luftskiftefrekvens, der er acceptabel for sikker clearance af aerosoler, baseret p\u00e5 deres kendte luftudvekslingsrater i kliniske omr\u00e5der. Mens typiske intervaller for forskellige typer faciliteter er tilg\u00e6ngelige, kan brug af estimater frem for h\u00e5rde data v\u00e6re forbundet med risiko.<\/p>\n<p>For Covid-positive patienter eller patienter, hvis Covid-status er ukendt, kan der desuden v\u00e6re behov for undertryk for at reducere risikoen for infektion uden for teatermilj\u00f8et.<\/p>\n<p><strong>Forbedring af biograftiden<\/strong><\/p>\n<p>Uanset antallet af luftskift et hospital har mellem procedurer, er der ingen tvivl om, at den politik, hvert hospital beslutter sig for, kan have v\u00e6sentlige konsekvenser for teatrets produktivitetsniveauer. En reduktion af den tid, det tager for hvert luftskifte, og derfor teaterventetider, kan f\u00f8re til effektivitetsgevinster og direkte p\u00e5virke, hvor mange patienter, der kan behandles p\u00e5 \u00e9n dag.<\/p>\n<p>Jo h\u00f8jere luftstr\u00f8mme og antallet af luftskift i timen, der er muligt i et rum eller teater, jo hurtigere <a href=\"https:\/\/bjanaesthesia.org\/article\/S0007-0912(20)30853-9\/fulltext\">aerosoler kan renses<\/a>, og jo hurtigere kan behandlingstiderne for patienten v\u00e6re. Selvom forskellen og den sparede tid mellem hver procedure kan virke lille, kan det g\u00f8re en v\u00e6sentlig forskel i forhold til antallet af procedurer, der udf\u00f8res p\u00e5 en dag eller en uge, hvilket i sidste ende reducerer patientens ventetid p\u00e5 planlagte kirurgiske og diagnostiske procedurer.<\/p>\n<p>Mobile og modul\u00e6re operationsstuer repr\u00e6senterer st\u00e6rkt kontrollerede milj\u00f8er, hvilket letter beregningen af antallet af luftskift, der kr\u00e6ves i hvert enkelt tilf\u00e6lde. Ud over at tilf\u00f8je kapacitet til at reducere ventelister, kan disse enheder i nogle tilf\u00e6lde tilbyde et h\u00f8jere antal luftskift i timen end et hospitals interne faciliteter, hvilket \u00f8ger gennemstr\u00f8mningen endnu mere.<\/p>\n<p>Vanguard&#039;er <a href=\"\/da_dk\/facilities\/operating-theatres\/\">mobile operationsstuer<\/a> og <a href=\"\/da_dk\/facilities\/endoscopy\/\">endoskopi suiter<\/a> tilbyde HEPA-filtreret milj\u00f8luft med op til 30 friskluftskift i timen, der passerer over patienten, mens en <a href=\"\/da_dk\/facilities\/operating-theatres\/\">mobilt laminar flow teater<\/a> kan udf\u00f8re op til 60 luftskift i timen i teaterrummet.<\/p>\n<p>Yderligere information findes i &#039;<a href=\"https:\/\/icmanaesthesiacovid-19.org\/managing-theatre-processes-for-planned-surgery-between-covid-19-surges\">H\u00e5ndtering af teaterprocesser for planlagt operation mellem COVID-19-stigninger<\/a>&#039;, et f\u00e6lles vejledningsdokument fra Faculty of Intensive Care Medicine, Intensive Care Society, Association of Anesthetists og Royal College of Anaesthetists, ogs\u00e5 godkendt af Royal College of Surgeons of England.<\/p>\n<p>Det <a href=\"https:\/\/www.rcseng.ac.uk\/coronavirus\/recovery-of-surgical-services\/\">Royal College of Surgeons<\/a> af England, den <a href=\"https:\/\/www.alsgbi.org\/2020\/04\/22\/laparoscopy-in-the-covid-19-environment-alsgbi-position-statement\/\">Association of Laparoscopic Surgeons of Great Britain &amp; Ireland<\/a> og en <a href=\"https:\/\/www.rcseng.ac.uk\/coronavirus\/joint-guidance-for-surgeons-v2\/\">interkollegial gruppe<\/a> af kirurgiske organisationer har ogs\u00e5 udgivet vejledningsdokumenter om kirurgiske aspekter af planlagte forl\u00f8b og patienth\u00e5ndtering under Covid-19.<\/p>","protected":false},"excerpt":{"rendered":"<p>Da den planlagte operation forts\u00e6tter p\u00e5 hospitaler, sidel\u00f8bende med behandlingen af Covid-19-patienter, er transmissionsbaserede forholdsregler fortsat afg\u00f8rende for at minimere risikoen og sikre, at procedurer g\u00e5r videre. Men hastigheden af mulige luftskift p\u00e5 operationsstuer er ogs\u00e5 en n\u00f8glefaktor.<\/p>","protected":false},"author":1,"featured_media":1366,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2,115],"tags":[137,5,122],"class_list":["post-3619","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-products-and-services","tag-endoscopy-suite","tag-mobile","tag-operating-theatre"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The importance of air changes - Vanguard Healthcare Solutions<\/title>\n<meta name=\"description\" content=\"Transmission-based precautions as well as the rate of air changes possible in operating theatres are crucial to continue care during Covid-19\" \/>\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.vanguardhealthcare.co.uk\/da_dk\/the-importance-of-air-changes\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The importance of air changes - 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