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Fixed FEV1/FVC ratio < 0.7 for identifying airflow limitation: not a good idea in occupational settings - letters.

Authors
Hnizdo-E; Petsonk-EL
Source
Occup Environ Med 2012 Mar; 69(3):227
NIOSHTIC No.
20040403
Abstract
Dr S°yseth and colleagues recently reported an increased prevalence of airflow limitation in workers employed in the Norwegian smelting industry and significant associations with workplace dust exposures.1 The prevalence of airflow limitation was assessed using prebronchodilator spirometry and two measures of airflow limitation: FEV1/FVC ratio < 0.7 and FEV1/FVC ratio < lower limit of normal (LLN). When compared across age categories (< 35, 35-44, > / = 45 years), the prevalence of airflow limitation based on the ratio < 0.7 versus LLN was approximately doubled in the > / = 45 years age categories across all levels of exposure duration (overall approximately 17.6 vs approximately 8.8%). The rate of FEV1 decline was increased for prevalent and incident cases of airflow limitation defined by both criteria, but it would be of interest to see the rates of decline for workers with FEV1/FVC < 0.7 compared with those where the ratio is / = LLN. The authors recommended that "in occupational healthcare settings, FEV1/FVC ratio < 0.7 should be the preferred index for airflow limitation".
Keywords
Respiratory-system-disorders; Smelters; Smelting; Air-flow; Spirometry; Age-groups; Exposure-assessment; Health-care; Health-care-facilities; Surveillance
Contact
Dr. Eva Hnizdo, Division of Respiratory Disease Studies, National Institute for Occupational Health and Safety, Morgantown, WV 26508, USA
CODEN
OEMEEM
Publication Date
20120301
Document Type
Other
Email Address
exh6@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B03142012
Issue of Publication
3
ISSN
1351-0711
NIOSH Division
DRDS
Priority Area
Construction; Mining
Source Name
Occupational and Environmental Medicine
State
WV
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