POSSIBILITIES OF VOLUMETRIC CAPNOGRAPHY METHOD IN THE STUDY OF PULMONARY FUNCTIONS IN PATIENTS WITH COPD

Spirometry and capnography are the methods, allowing to assess lung functions in patients with respiratory diseases. Capnovolumetry is a technique that combines the diagnostic capabilities of both spirometry and capnography, it can detect carbon dioxide concentration dependence on the volume of exhaled air. The purpose of this work is to identify additional opportunities of volumetric capnography method in the study of pulmonary functions in patients with COPD. The study involved 77 males, of which 40 patients are with COPD. Spirometry and volumetric capnography using an ultrasound computer spirograph SpiroScout (Ganshorn, Germany) are performed in each patient. Parameters of spirometry were analyzed, VD-threshold, VD-Bohr, VD-Bohr/VT, VD-Fowler, VT, dMM/dV2, dMM/dV3, Alpha s2s3, VD-threshold exh., VD-Bohr exh., VD-Fowler exh., dMM/dV2 exh., dMM/dV3 exh, dMM/dV4 exh., V Cap. The obtained results showed significant differences among patients with COPD and the control group according to the parameters reflecting the shape of capnography curve: dMM/dV2, dMM /dV3, dMM/dV2 exh., DMM/dV3 exh. In this way, the technique of volumetric capnography allows to expand understanding of lung functions changes in patients with COPD.