A reliable average inverse correlation was established between a decrease in the excursion of the diaphragm during forced and quiet breathing and an increase in AHDLA in patients II (r = –0.59; P <0.05 and -0.51; P <0.05) and III (r = – 0.66; P <0.01 and – 0.61; P <0.05) groups. A strong positive correlation was found between a decrease in the MOVP of the sum and a decrease in the pO 2 of blood in patients of the II (0.86; P <0.001) and III (0.9; P <0.001) groups. The inverse correlation relationship between the decrease in blood pO 2 and the increase in SrDLA in patients of the II (r = –0.65; P <0.01) and III (r = –0.9; P <0.001) groups was diagnosed. Smaller correlation coefficient and reliability in group II is explained by insignificant changes in pO 2 indices in these patients. and SrDLA. It can be concluded that a violation of the functional capacity of the diaphragm leads to impaired ventilation of the middle and lower zones of the lungs, as a result of which hypoxemia and PH develop.

A significant increase in the liver and spleen, which occurs in many patients with a progressive course of CLL and in the terminal stage of the disease, contributes to a high standing of the diaphragm case and disruption of its excursion. The diaphragm is the main respiratory muscle, which, under physiological conditions, provides 2/3 of the vital capacity of the lungs, and 70–80% of inspiration with forced respiration [208]. So, according to J.L. Shika and V.I. Sobolev, as a result of the movement of the diaphragm, the lower and 40-50% of the ventilation volume of the upper lobes of the lungs is fully ventilated. Violation of the excursion of the diaphragm, the main respiratory muscle, is an important factor in the violation of respiratory function in the late stages of tumor progression in patients with CLL. Compression of the lower parts of the lungs with enlarged liver and spleen is an important factorreducing respiratory volume lower zones and redistribution of ventilation in the upper zones of the lungs. It can be argued that mechanical compression of the diaphragm with enlarged liver and spleen and its specific leukemic lesion contribute to impaired contractility of the diaphragm, which is one of the reasons for the development of hypoxemia and PH in patients with CLL II group without an associated broncho-obstructive process. This group included a greater number of patients with the splenic CLL.

Other causes of hypoxemia and PH in patients with CLL in stage B are a decrease in microhemocirculation and a severe, prolonged course of infections of the bronchopulmonary system, accompanied by impaired ventilation and hemodynamics of the pulmonary circulation.