The hemostasis system, the level of pulmonary hypertension and myocardial condition (the thickness of the anterior wall of the right ventricle of heart, dystrophic changes of right and left ventricles) depending on hypoxemia level have been examined in 47 patients with chronic obstructive pulmonary disease. It was suggested that as the severity of hypoxemia increases, hypercoagulation of the blood, the degree of pulmonary hypertension, myocardial hypertrophy of the right ventricle and dystrophic changes of both ventricles of heart rise.