It was hypothesized that the V D/V TR was more significant than the standard lung function test in correlation with clinical characteristics and gas exchange (ie, all variables relevant to oxygen and CO 2 tensions and their differences in arterial blood and alveoli) in patients with COPD. 8, 10–15 However, exercise testing is labor consuming and costly and in diseases other than COPD, the V D/V T has been successfully used in non-exercise conditions. The dead space to tidal volume ratio at rest or at peak exercise or change during exercise (V D/V TR, -P, and -C) indicating the severity of ventilation/perfusion (V/Q) mismatch 9 can serve as a marker of physiological change in patients with COPD in a various clinical conditions. 1 Despite mMRC and acute exacerbation being related to the risk assessment of COPD, the power of correlations of FEV 1% with the clinical outcomes is not robust, 2–4 and lung volume such as the residual volume to total lung capacity ratio (RV/TLC) and diffusing capacity measurements (D LCO) provide additional information. The severity of chronic obstructive pulmonary disease (COPD) is usually graded by forced expired volume in one second % predicted (FEV 1%).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |