![]() ![]() This study aimed to test the hypothesis and to identify the variables relevant to V D/V TR.Ī total of 46 male subjects with COPD were enrolled. As V D/V T measured at rest (V D/V TR) has been successfully used in non-COPD conditions, it was hypothesized that in COPD the V D/V TR was more sensitive than the standard lung function test in correlation with clinical characteristics and gas exchange. However, the use of V D/V T has gradually become less common. The dead space fraction (V D/V T) has been shown to be a robust marker of gas exchange abnormality. ![]() Measures of forced expired volume in one second % predicted (FEV 1%), residual volume to total lung capacity ratio (RV/TLC) and diffusing capacity for carbon monoxide measurements (D LCO) are the standard lung function test for evaluating patients with chronic obstructive pulmonary disease (COPD).
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