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Design and evaluation of a portable negative pressure hood with HEPA filtration to protect health care workers treating patients with transmissible respiratory infections.
Phu, Hai-Thien; Park, Yensil; Andrews, Austin J; Marabella, Ian; Abraham, Asish; Mimmack, Reid; Olson, Bernard A; Chaika, Jonathan; Floersch, Eugene; Remskar, Mojca; Hume, Janet R; Fischer, Gwenyth A; Belani, Kumar; Hogan, Christopher J.
  • Phu HT; University of Minnesota Medical School, Department of Pediatrics, Minneapolis, MN; University of Minnesota Medical School, Division of General Internal Medicine, Minneapolis, MN.
  • Park Y; University of Minnesota, Department of Mechanical Engineering, Minneapolis, MN.
  • Andrews AJ; University of Minnesota, Department of Mechanical Engineering, Minneapolis, MN.
  • Marabella I; University of Minnesota, Department of Mechanical Engineering, Minneapolis, MN.
  • Abraham A; University of Minnesota Medical School, Department of Anesthesiology, Minneapolis, MN.
  • Mimmack R; University of Minnesota Medical School, Minneapolis, MN.
  • Olson BA; University of Minnesota, Department of Mechanical Engineering, Minneapolis, MN.
  • Chaika J; University of Minnesota, M Simulation, Minneapolis, MN.
  • Floersch E; University of Minnesota, M Simulation, Minneapolis, MN.
  • Remskar M; University of Minnesota Medical School, Department of Anesthesiology, Minneapolis, MN; University of Minnesota, M Simulation, Minneapolis, MN.
  • Hume JR; University of Minnesota Medical School, Department of Pediatrics, Minneapolis, MN.
  • Fischer GA; University of Minnesota Medical School, Department of Pediatrics, Minneapolis, MN.
  • Belani K; University of Minnesota Medical School, Department of Anesthesiology, Minneapolis, MN. Electronic address: belan001@umn.edu.
  • Hogan CJ; University of Minnesota, Department of Mechanical Engineering, Minneapolis, MN. Electronic address: hogan108@umn.edu.
Am J Infect Control ; 48(10): 1237-1243, 2020 10.
Article in English | MEDLINE | ID: covidwho-623888
ABSTRACT

BACKGROUND:

To mitigate potential exposure of healthcare workers (HCWs) to SARS-CoV-2 via aerosol routes, we have developed a portable hood which not only creates a barrier between HCW and patient, but also utilizes negative pressure with filtration of aerosols by a high-efficiency particulate air filter. MATERIAL AND

METHODS:

The hood has iris-port openings for access to the patient, and an opening large enough for a patient's head and upper torso. The top of the hood is a high-efficiency particulate air filter connected to a blower to apply negative pressure. We determined the aerosol penetration from outside to inside in laboratory experiments.

RESULTS:

The penetration of particles from within the hood to the breathing zones of HCWs outside the hood was near 10-4 (0.01%) in the 200-400 nm size range, and near 10-3 (0.1%) for smaller particles. Penetration values for particles in the 500 nm-5 µm range were below 10-2 (1%). Fluorometric analysis of deposited fluorescein particles on the personal protective equipment of an HCW revealed that negative pressure reduces particle deposition both outside and inside the hood.

CONCLUSIONS:

We find that negative pressure hoods can be effective controls to mitigate aerosol exposure to HCWs, while simultaneously allowing access to patients.
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Keywords

Full text: Available Collection: International databases Database: MEDLINE Main subject: Pneumonia, Viral / Respiratory Tract Infections / Infectious Disease Transmission, Patient-to-Professional / Coronavirus Infections / Pandemics / Filtration / Personal Protective Equipment Type of study: Experimental Studies Limits: Adult / Female / Humans / Male Language: English Journal: Am J Infect Control Year: 2020 Document Type: Article Affiliation country: J.ajic.2020.06.203

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Pneumonia, Viral / Respiratory Tract Infections / Infectious Disease Transmission, Patient-to-Professional / Coronavirus Infections / Pandemics / Filtration / Personal Protective Equipment Type of study: Experimental Studies Limits: Adult / Female / Humans / Male Language: English Journal: Am J Infect Control Year: 2020 Document Type: Article Affiliation country: J.ajic.2020.06.203