TY - JOUR
T1 - Clinical validation of the Welch-Allyn pneumocheck(TM) hand held spirometer
AU - Barkley, B.
AU - Lichtenstein, M. J.
AU - Garza, C.
AU - Hazuda, H. P.
N1 - Funding Information:
From the *Geriatrics Research, Education and Clinical Center (181) and the t Pulmonary Function Laboratory, Audie L. Murphy VA Hospital, San Antonio, Texas, and the :tIJivision of Clinical Epidemiology, University of Texas Health Science Center, San Antonio, Texas. Supported by NIA grants 1-R01-AG10939-01 and T-35-AG00230-01. Additional support came from NIH Grant M01-RR-01346 for the Clinical Research Center at the Audie L. Murphy Veterans Hospital. This research was not supported in any way by Welch-Allyn, Inc. None of the authors have any financial or consultative affiliations with Welch-Allyn, Inc. Correspondence: Michael J. Lichtenstein, MD, MSc, Geriatrics Research, Education and Clinical Center (181), Audie L. Murphy VA Hospital, 7400 Merton Minter Blvd, San Antonio, TX 78284.
PY - 1994
Y1 - 1994
N2 - Pulmonary function is predictive of morbidity and mortality. Therefore, in epidemiologic studies, researchers seek to measure pulmonary function with portable spirometers feasible for use in clinics or participants' homes. The purpose of this study was to validate a hand held spirometer, the Welch- Allyn Pneumocheck(TM), against standard pulmonary function tests. The authors used a convenience sample of 66 subjects. All subjects were asked to perform three vital capacity maneuvers with the Welch-Allyn Pneumocheck(TM) and then either a water seal spirometer or heated pneumotach in a hospital pulmonary function laboratory. The mean forced vital capacity (FVC) obtained with the Pneumocheck(TM) was 3.50 liters (standard deviation (SD) = 1.28) compared with 3.31 liters (SD = 1.24) for the pulmonary function laboratory. The correlation between the two measures was 0.98; the mean difference was 0.19 L (95% confidence interval = 0.12 to 0.26). The mean forced expiratory volume at one second (FEV1) was 2.31 L (SD = 1.07) for the Pneumocheck(TM) compared with 2.32 L (SD = 1.06) for the pulmonary function laboratory values. The correlation between the two measures was 0.99; the mean difference was 0.01 L (95% confidence interval = -0.03 to 0.04). Of the 46 subjects originally classified by the Pneumoeheck(TM) as having FEV1/FVC ratios of less than 0.75, 10 (22%) had ratios greater than or equal to 0.75 after correcting for the FVC difference between methods. Therefore, there was an excellent correlation between the Welch-Allyn Pneumocheck(TM) and pulmonary function laboratory values for FVC and FEV1. Small systematic differences in FVC measures can lead to substantial misclassification rates when evaluating FEV1/FVC ratios.
AB - Pulmonary function is predictive of morbidity and mortality. Therefore, in epidemiologic studies, researchers seek to measure pulmonary function with portable spirometers feasible for use in clinics or participants' homes. The purpose of this study was to validate a hand held spirometer, the Welch- Allyn Pneumocheck(TM), against standard pulmonary function tests. The authors used a convenience sample of 66 subjects. All subjects were asked to perform three vital capacity maneuvers with the Welch-Allyn Pneumocheck(TM) and then either a water seal spirometer or heated pneumotach in a hospital pulmonary function laboratory. The mean forced vital capacity (FVC) obtained with the Pneumocheck(TM) was 3.50 liters (standard deviation (SD) = 1.28) compared with 3.31 liters (SD = 1.24) for the pulmonary function laboratory. The correlation between the two measures was 0.98; the mean difference was 0.19 L (95% confidence interval = 0.12 to 0.26). The mean forced expiratory volume at one second (FEV1) was 2.31 L (SD = 1.07) for the Pneumocheck(TM) compared with 2.32 L (SD = 1.06) for the pulmonary function laboratory values. The correlation between the two measures was 0.99; the mean difference was 0.01 L (95% confidence interval = -0.03 to 0.04). Of the 46 subjects originally classified by the Pneumoeheck(TM) as having FEV1/FVC ratios of less than 0.75, 10 (22%) had ratios greater than or equal to 0.75 after correcting for the FVC difference between methods. Therefore, there was an excellent correlation between the Welch-Allyn Pneumocheck(TM) and pulmonary function laboratory values for FVC and FEV1. Small systematic differences in FVC measures can lead to substantial misclassification rates when evaluating FEV1/FVC ratios.
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U2 - 10.1097/00000441-199412000-00009
DO - 10.1097/00000441-199412000-00009
M3 - Article
C2 - 7985725
AN - SCOPUS:0027944817
VL - 308
SP - 357
EP - 359
JO - American Journal of the Medical Sciences
JF - American Journal of the Medical Sciences
SN - 0002-9629
IS - 6
ER -