PURPOSE: Portable spirometer is useful and convenient to evaluate obstructive lung disorders measuring FEV1/FEV6 and pick up undiagnosed COPD patients. Hi Checker (COPD-6, Vitalograph) is a scaled-down portable spirometer that can measure FEV1 and FEV6 approximating FEV1% as FEV1/FEV6. The present study focused on the correlation between these portable and conventional spirometer in patients with respiratory disorders.
METHODS: Respiratory functions of consecutive 81 inpatients were evaluated by Hi Checker and conventional spirometer (FUDAC-77) between December 2010 and April 2011 in our university hospital. Male/female was 53/28 and the average (range) of the patients’ age was 66.7 (28-84) yeas old, and the patient backgrounds were varied (lung cancer, pneumonia, interstitial pneumonia, sarcoidosis, COPD, etc.). Current- or ex-smoker/non-smoker was 48/33. Forced expiratory volume in one second (FEV1) and FEV6 were measured by Hi Checker, and FEV1 and forced vital capacity (FVC) were also analyzed by conventional spirometer. Correlations between FEV1 measured by both methods, between FEV1/FEV6 and FEV1/FVC, and between “Lung Ages” calculated by both methods were also analyzed using Pearson and Spearman correlation analyses.
RESULTS: A significant correlation between FEV1 measured by both methods was observed (r=0.88). FEV1/FEV6 measured by Hi Checker and FEV1/FVC measured by conventional spirometer were approximately the same and significantly correlated (rs=0.67). The average of FEV1 measured by hi-checker was significantly lower than FEV1 measured by conventional spirometer (1,565ml and 1,825ml, respectively). Calculated “Lung Age” was also correlated between Hi Checker and conventional spirometer.
CONCLUSIONS: Portable spirometer (Hi Checker) is useful, inexpensive and convenient for checking FEV1 and obstructive lung disorders.
CLINICAL IMPLICATIONS: Portable spirometer (Hi Checker) is useful, inexpensive and convenient for picking up undiagnosed COPD patients as a substitute for conventional spirometer.
DISCLOSURE: The following authors have nothing to disclose: Minako Kozaki, Makiko Shimauchi, Kazuhiro Yatera, Kentarou Akata, Shuya Nagata, Chinatsu Nishida, Kei Yamasaki, Toshinori Kawanami, Hiroshi Ishimoto, Chiharu Yoshii, Hiroshi Mukae
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