| Abstract: | To assess performances of N95 respirators for Health Care Workers (HCWs) in a simulated
health-care setting, we measured the Simulated Workplace Protection Factors (SWPFs) in
real-time from the volunteers. A total of 49 study subjects, wearing 3 M respirator Model
N95 1860 and 1860S, were fit tested using the OSHA Exercise Regimen. The test subjects
were asked to perform simulated scenarios, including patient assessments, suction, and
intravenous injection (IV) treatment. Two TSI PortaCount instruments continuously measured
concentrations in the respirator and the room concentration. For Quantitative Fit Testing
(QNFT), 36 out of 49 (73.5%) passed the fit factor (FF) criteria set at 100 and 13 (26.5%)
failed. The results of QNFT were found to have a low correlation with SWPF, with
R2=0.32. The geometric means (GM) and geometric standard deviations (GSD) of
SWPF were 68.8 (1.1) for those subjects who passed and 39.6 (1.3) for those who failed.
Real-time assessments of SWPF showed that lower SWPFs were; moving head up and down, and
bending at the waist. This study identifies the needs for providing different sizes of
respirators for HCWs and the importance of performing fit tests for HCWs regularly. And
particular movements were identified as attributing factors affecting more on SWPFs. |
