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Interaction of respirator (PPE) type and respiratory conditions on breathing patterns.

Authors
Bansal-S; Santiago-S; Yun-D; Wu-S; Liu-E; Nguyen-F; Harber-P
Source
Am J Respir Crit Care Med 2009 Apr; 179(Meeting Abstracts):A1637
NIOSHTIC No.
20036376
Abstract
PURPOSE: Respirators (respiratory personal protective equipment, RPPE) may be widely used for protection in response to epidemics or terrorist threats. This study compares two types: Half-Face Mask Dual Cartridge (HFM) and Filtering Facepiece (N95) during simulated work activities in order to describe the interactions between respirator type and health status (mild Asthma (A), COPD (C), Rhinitis (R), Normal). METHODS: Measurements were made using a respiratory inductive plethysmograph (Vivometrics) during 8 different activities. Data were analyzed using mixed model regression with each physiologic measure as outcome and RPPE, task, disease, and disease*RPPE interaction. Disease was represented by dummy variables for the 3 conditions with Normal as reference. 77 subjects participated. RESULTS: In addition to the main effects of RPPE type and disease per se, there were significant interactions between disease and RPPE type for several physiologic variables, implying that the effect of RPPE varies depending on a user's health status. Significant interactions bewteen disease and RPPE type included: (Minute ventilation: A and R; Tidal volume: A and R; Inspiratory time: A and C; Expiratory time: A and C; Cycle time: A and C). CONCLUSIONS: (1) Respirators should be evaluated with human panels including persons with a variety of respiratory conditions. (2) The optimal respirator for a person may depend upon hs/her health status.
Keywords
Biological-factors; Filters; Inhalation-studies; Mathematical-models; Personal-protective-equipment; Protective-equipment; Respirators; Respiratory-equipment; Respiratory-hypersensitivity; Respiratory-protection; Respiratory-protective-equipment; Respiratory-rate; Work-environment; Work-performance; Worker-health; Workplace-studies
CODEN
AJCMED
Publication Date
20090401
Document Type
Abstract
Funding Type
Grant
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008119
ISSN
1073-449X
Source Name
American Journal of Respiratory and Critical Care Medicine
State
CA
Performing Organization
University of California, Los Angeles
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