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Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study
AIM AND OBJECTIVE: Fogging of eyeglasses while wearing N95 respirators is common. It is commonly held that the N95 respirator has a poor fit if there is fogging of eyeglasses. We conducted this prospective, pilot study to determine if fogging of eyeglasses predicts poor fit of N95 respirator. MATERI...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Jaypee Brothers Medical Publishers
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8664036/ https://www.ncbi.nlm.nih.gov/pubmed/34963713 http://dx.doi.org/10.5005/jp-journals-10071-23947 |
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author | Kyaw, Sandy Johns, Moira Lim, Rimen Stewart, Warren C Rojas, Natalia Thambiraj, Solomon R Shehabi, Yahya Arora, Sumesh |
author_facet | Kyaw, Sandy Johns, Moira Lim, Rimen Stewart, Warren C Rojas, Natalia Thambiraj, Solomon R Shehabi, Yahya Arora, Sumesh |
author_sort | Kyaw, Sandy |
collection | PubMed |
description | AIM AND OBJECTIVE: Fogging of eyeglasses while wearing N95 respirators is common. It is commonly held that the N95 respirator has a poor fit if there is fogging of eyeglasses. We conducted this prospective, pilot study to determine if fogging of eyeglasses predicts poor fit of N95 respirator. MATERIALS AND METHODS: Seventy volunteer healthcare workers from a tertiary intensive care unit in Sydney, Australia participated. The participants donned one of the following N95 respirators: three-panel flat-fold respirator (3M 1870), cup-shaped respirator (3M 1860), or a duckbill respirator. After a satisfactory “user seal check” as recommended by the manufacturer, the participants donned eyeglasses and checked for fogging. A quantitative fit test (QnFT) of the respirator was then performed (using PortaCount Respirator Fit Tester 8048, TSI Inc., Minnesota, USA). A fit factor of <100 on quantitative fit testing indicates poor fit. The sensitivity and specificity for fogging of eyeglasses (index test) to predict the poor fit of N95 respirator was determined, compared to QnFT (gold standard test). RESULTS: Fogging of eyeglasses as a predictor of poor respirator fit (i.e., fit factor <100 on QnFT) had sensitivity of 71% (95% CI, 54–85%) and specificity 46% (95% CI, 29–63%). The odds ratio of fogging as a predictor for poor fit was 2.10 (95% CI, 0.78–5.67), with a two-tailed p-value of 0.22 (not significant). The receiver operating characteristic curve for fogging of eyeglasses as a diagnostic test had the area under the curve of 0.59. CONCLUSION: Fogging of eyeglasses is neither a sensitive nor a specific predictor for poor fit of N95 respirators. HOW TO CITE THIS ARTICLE: Kyaw S, Johns M, Lim R, Stewart WC, Rojas N, Thambiraj SR, et al. Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study. Indian J Crit Care Med 2021;25(9):976–980. |
format | Online Article Text |
id | pubmed-8664036 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Jaypee Brothers Medical Publishers |
record_format | MEDLINE/PubMed |
spelling | pubmed-86640362021-12-27 Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study Kyaw, Sandy Johns, Moira Lim, Rimen Stewart, Warren C Rojas, Natalia Thambiraj, Solomon R Shehabi, Yahya Arora, Sumesh Indian J Crit Care Med Original Article AIM AND OBJECTIVE: Fogging of eyeglasses while wearing N95 respirators is common. It is commonly held that the N95 respirator has a poor fit if there is fogging of eyeglasses. We conducted this prospective, pilot study to determine if fogging of eyeglasses predicts poor fit of N95 respirator. MATERIALS AND METHODS: Seventy volunteer healthcare workers from a tertiary intensive care unit in Sydney, Australia participated. The participants donned one of the following N95 respirators: three-panel flat-fold respirator (3M 1870), cup-shaped respirator (3M 1860), or a duckbill respirator. After a satisfactory “user seal check” as recommended by the manufacturer, the participants donned eyeglasses and checked for fogging. A quantitative fit test (QnFT) of the respirator was then performed (using PortaCount Respirator Fit Tester 8048, TSI Inc., Minnesota, USA). A fit factor of <100 on quantitative fit testing indicates poor fit. The sensitivity and specificity for fogging of eyeglasses (index test) to predict the poor fit of N95 respirator was determined, compared to QnFT (gold standard test). RESULTS: Fogging of eyeglasses as a predictor of poor respirator fit (i.e., fit factor <100 on QnFT) had sensitivity of 71% (95% CI, 54–85%) and specificity 46% (95% CI, 29–63%). The odds ratio of fogging as a predictor for poor fit was 2.10 (95% CI, 0.78–5.67), with a two-tailed p-value of 0.22 (not significant). The receiver operating characteristic curve for fogging of eyeglasses as a diagnostic test had the area under the curve of 0.59. CONCLUSION: Fogging of eyeglasses is neither a sensitive nor a specific predictor for poor fit of N95 respirators. HOW TO CITE THIS ARTICLE: Kyaw S, Johns M, Lim R, Stewart WC, Rojas N, Thambiraj SR, et al. Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study. Indian J Crit Care Med 2021;25(9):976–980. Jaypee Brothers Medical Publishers 2021-09 /pmc/articles/PMC8664036/ /pubmed/34963713 http://dx.doi.org/10.5005/jp-journals-10071-23947 Text en Copyright © 2021; Jaypee Brothers Medical Publishers (P) Ltd. https://creativecommons.org/licenses/by-nc/4.0/© Jaypee Brothers Medical Publishers. 2021 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted use, distribution, and non-commercial reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/ (https://creativecommons.org/publicdomain/zero/1.0/) ) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Original Article Kyaw, Sandy Johns, Moira Lim, Rimen Stewart, Warren C Rojas, Natalia Thambiraj, Solomon R Shehabi, Yahya Arora, Sumesh Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study |
title | Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study |
title_full | Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study |
title_fullStr | Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study |
title_full_unstemmed | Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study |
title_short | Prediction of N95 Respirator Fit from Fogging of Eyeglasses: A Pilot Study |
title_sort | prediction of n95 respirator fit from fogging of eyeglasses: a pilot study |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8664036/ https://www.ncbi.nlm.nih.gov/pubmed/34963713 http://dx.doi.org/10.5005/jp-journals-10071-23947 |
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