Document Type : Original Article
Department of Internal Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
Resident of Internal medicine, Isfahan University of Medical Science, Isfahan, Iran
Department of Community Medicine, Isfahan University of Medical Science, Isfahan, Iran
Background: The current study was done to evaluate the validity and reliability of the Vitalograph COPD-6 portable device for detecting chronic obstructive pulmonary disease (COPD) in high-risk individuals in Iran.
Materials and Methods: This research was a cross-sectional descriptive study. Forced expiratory volume in one second (FEV1), forced vital capacity (FVC), and FEV1/FVC using standard spirometer and FEV1, FEV6, and FEV1/FEV6 with COPD- 6 device were measured and recorded. Descriptive analysis was done.
Results: 19 of 122 patients (15.6%) were diagnosed with COPD. The COPD-6 had an acceptable performance for detecting COPD as assessed by the area under the receiver operating characteristic (ROC) curve (0.72 ; 95% CI: 0.42-0.86), with an average sensitivity of 84% and specificity of 98%, positive predictive value of 89%, and negative predictive value of 97%. The positive likelihood ratio resulted was 42 and the negative likelihood ratio was 0.16.
Conclusion: COPD-6 is a validate and reliable device for detecting COPD in non-specialized health care settings and the best cut-off point for FEV1/FEV6 ratio is 0.72.