Optimizing twin sampling tube stabilization improves quantitative fit test results for flat-fold duckbill filtering facepiece respirators - 20/05/23
, Benjamin Kave, MBBS a, Charles Bodas, GradDipHlth (WHS) a, Fiona Begg, BAppSc (OT) a, Megan Roberts, BA (Hons) a, Irene Ng, MBBS a, bHighlights |
• | Quantitative fit testing (QNFT) requires a sampling tube attachment. |
• | Robust sampling tube stabilization is needed for QNFT of flat-fold type respirators. |
• | Lanyard technique had significantly lower QNFT pass rates than hand-hold technique. |
• | Fit testers should pay close attention to the sampling tube during QNFT. |
Résumé |
Introduction |
When performing quantitative fit testing (QNFT) on filtering facepiece respirators using an ambient aerosol technique, a twin sampling tube is connected between the condensation nuclei count machine and the probed respirator. To achieve high quality and repeatable QNFT results, robust sampling tube stabilization is required.
Methods |
In this prospective randomized crossover study, conducted in December 2021 to February 2022, we compared the commonly used hand-hold technique with the manufacturer-recommended lanyard technique in stabilizing the sampling tube during QNFT on a Halyard N95 respirator. Outcomes included QNFT pass rates, overall and individual fit factors, and concordance between the two techniques.
Results |
A total of 228 out of 316 participants (72.2%) passed the QNFT with the hand-hold technique, compared to the lanyard technique (166/316, 52%, P < .001). The most significant drop in the fit factors with the lanyard technique occurred during head movement side-to-side and up-and-down. The concordance between the 2 techniques was fair (Kappa coefficient = 0.39).
Conclusion |
Our study demonstrates that the method of sampling tube stabilization during QNFT has a significant impact on fit test pass rates, with a potential for false negative fit tests due to inadequate tube stabilization. Further research is required to examine the generalizability of these results to other respirators and fit testing apparatuses.
Le texte complet de cet article est disponible en PDF.Key Words : Ambient aerosol quantitative fit testing, Twin sampling tube stabilization techniques, N95 filtering facepiece respirators, Reliability of fit test results
Plan
| Funding: The lanyards for this study were provided by TSI incorporated. TSI had no part in the study design, data collection, data analysis, data interpretation, writing or editing of the manuscript. |
|
| Conflicts of interest: None to report. |
Vol 51 - N° 6
P. 694-698 - juin 2023 Retour au numéro
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