Outpatient Surgery Magazine

OR Excellence Awards - September 2020 - Subscribe to Outpatient Surgery Magazine

Outpatient Surgery Magazine, providing current information on Surgical Services, Surgical Facility Administration, Outpatient Surgery News and Trends, OR Excellence and more.

Issue link: http://magazine.outpatientsurgery.net/i/1284191

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Page 18 of 71

Aim to humidify your entire build- ing in that very comfortable range. That sounds relatively straight- forward, but it's sometimes easier said than done. Many surgeons like to keep their ORs cool because they're wearing multiple layers of sterile gowns, and in the COVID-19 era, maximum PPE usage is going to be even more commonplace. But when you turn the temperature down in the OR you could develop condensation in your ductwork because the dew point is reached. In response, facili- ty managers often lowered the minimum relative humidity in ORs to 20%. When they did that, SSI rates increased. With low humidity, more infectious particles are in the air. That's been a big surprise to many surgical professionals, but findings have been very consistent in this regard. There are so many other benefits to midrange humidity. The cells around a surgical incision are less likely to become damaged because the air isn't too dry. You're also supporting everyone's respira- tory immunity — keeping the mucus in their air- ways hydrated, ensuring the cilia are able to func- tion and facilitating production of interferon, a pro- tective protein. • Air filtration. Filtering the air in your facility is more important than ever. I currently serve on the epidemic task force with the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). We recommend MERV 13 — middle-efficiency filtration — throughout the build- ing and higher-efficiency HEPA filters in the ORs. One widespread, fearful notion about COVID-19 is that it can travel through your HVAC system. Well, yes and no. This novel coronavirus is a ribonucleic acid (RNA) virus. Viral RNA has been recovered from HVAC systems, but the jury remains out on how infectious it might be, as we still need more testing and study. Bottom line: High-efficiency HEPA filters in your ORs are important safeguards. • Air exchanges. ASHRAE recommends any- where from 15 to 22 room air changes per hour for ORs. Note that changing the room air more fre- quently doesn't guarantee it will be clean, which gets us back to humidity. If the air is really dry and you have 30 air changes an hour, you'll actually have more particles in the air than if you have prop- er humidity and a lower air change rate. At 40% to 60% relative humidity, you can reduce your room air change rates and save energy that way, too. • Novel solutions. A number of technologies such as hydrogen peroxide vapor, aerosolized hydrogen peroxide and ultraviolet light (UVC) can assist you in keeping the air free of COVID-19 and other pathogens. In my view, they're all positive as supplemental tools to the regular manual cleaning of surfaces, but won't guarantee safety on their own. For example, engineers generally design lami- nar airflow into ORs. Traditionally, that means air comes down the walls. You're trying to avoid air turbulence, which stirs up infectious particles and dust that you don't want landing in your incision. The thing about laminar airflow is it never works as well as it does in computerized flow diagrams. Theoretically, it's a good idea, but it doesn't really work that precisely. UVC can disassemble RNA viruses such as COVID-19. Although we usually think of UVC in terms of portable robots, I believe UVC has a use in ductwork, such as around cooling coils where you don't want biofilm forming. What's scary, however, is that we're beginning to see viruses and bacteria that have developed resistance to ultraviolet light. Keeping your facility safe from COVID-19 is an ongoing process where numerous different compo- nents work together to minimize risk. You can't totally eliminate the possibility of there being COVID-19 in your building, but by employing all of the tools in your belt, you can make your environ- ment as safe as it possibly can be. OSM Dr. Taylor (md@taylorcx.com) is CEO of Taylor Healthcare Commissioning. A pediatric oncologist by training, she also possesses a masters in architecture as well as an infection control certification. S E P T E M B E R 2 0 2 0 • O U T P A T I E N T S U R G E R Y . N E T • 1 9 With low humidity, more infectious particles are in the air.

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