Examination of 38 patients with chronic postembolic pulmonary hypertension revealed gross hemorheological disorders: increased viscosity of blood, extreme aggregation activity of blood cells, diminished property or erythrocytes to undergo deformity when circulating through the capillaries. Small amounts of UV-irradiated autologous blood were infused repeatedly for the correction of these disorders. After a course of treatment the hemorheological indices were normalized in all the patients, which was attended by improvement of the general condition and positive hemodynamic shifts.

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