| Autor: |
Hankinson, J L, Castellan, R M, Kinsley, K B, Keimig, D G |
| Zdroj: |
Journal of Occupational Medicine; December 1986, Vol. 28 Issue: 12 p1222-1225, 4p |
| Abstrakt: |
Spirometric parameters are generally obtained at ambient (spirometer) temperature pressure saturated (ATPS) and then converted to body temperature pressure saturated (BTPS) by multiplying each observed value by a BTPS correction factor. At ambient temperatures of 23°C or higher, the accepted practice of using a constant BTPS factor introduces a relatively small error in forced expiratory volume in one second (FEV1), but as the temperature decreases below 23°C the error in FEV1increases. A dynamic BTPS correction factor model has recently been developed to reduce this error. Analysis of across-shift spirometry data from a recent survey indicates that, with an increase in temperature over a work shift of greater than 3°C, 27.1 of 302 subjects were classified as having a =5 FEV1drop over the shift using the dynamic BTPS factor model, compared with 41.4 when the standard BTPS correction factor was used (P<.005). These results indicate the importance of correcting for ambient temperature differences when analyzing for shift changes in spirometric parameters. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
