Evaluation of face shields used during aerosol generating procedures

Alessandra A. Pratt; Grant D. Brown; Jarrett E. Walsh; Henry T. Hoffman; Matthew W. Nonnenmann

doi:10.1038/s41598-023-42403-8

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Evaluation of face shields used during aerosol generating procedures

Journal article

Open access

Peer reviewed

Evaluation of face shields used during aerosol generating procedures

Alessandra A. Pratt, Grant D. Brown, Jarrett E. Walsh, Henry T. Hoffman and Matthew W. Nonnenmann

Scientific reports, Vol.13(1), 15617

09/20/2023

DOI: 10.1038/s41598-023-42403-8

PMCID: PMC10511466

PMID: 37730888

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https://doi.org/10.1038/s41598-023-42403-8View

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Abstract

Transnasal flexible laryngoscopy is considered an aerosol generating procedure. A negative pressure face shield (NPFS) was developed to control aerosol from the patient during laryngoscopy. The purpose of this study was to determine the effectiveness of the NPFS at controlling virus aerosol compared to a standard disposable plastic face shield. The face shields were placed on a simulated patient coughing machine. MS2 bacteriophage was used as a surrogate for SARS-CoV-2 and was aerosolized using the coughing machine. The aerosolized virus was sampled on the inside and outside of the face shields. The virus aerosol concentration was not significantly different between the inside and outside of the traditional plastic face shield (p = 0.12). However, the particle concentrations across all particle sizes measured were significantly decreased outside the face shield. The virus and particle concentrations were significantly decreased (p < 0.01) outside the NPFS operating at a flow rate of 38.6 L per minute (LPM). When the NPFS was operated at 10 LPM, virus concentrations were not significantly different (p = 0.09) across the face shield. However, the number particle concentrations across all particle sizes measured were significantly different (p < 0.05).

Details

Title: Subtitle: Evaluation of face shields used during aerosol generating procedures
Creators: Alessandra A. Pratt - Iowa City VA Health Care System
Grant D. Brown - University of Iowa
Jarrett E. Walsh - University of Iowa
Henry T. Hoffman - University of Iowa
Matthew W. Nonnenmann - University of Nebraska Medical Center
Resource Type: Journal article
Publication Details: Scientific reports, Vol.13(1), 15617
DOI: 10.1038/s41598-023-42403-8
PMID: 37730888
PMCID: PMC10511466
NLM abbreviation: Sci Rep
ISSN: 2045-2322
eISSN: 2045-2322
Publisher: Nature Publishing Group UK
Grant note: (CK000557/CK18-001) / ; CK000557/CK18-001 / ;
Language: English
Date published: 09/20/2023
Academic Unit: Occupational and Environmental Health; Biostatistics; Radiation Oncology; Otolaryngology; Internal Medicine
Record Identifier: 9984473762902771

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