The pressure in pulmonary and brachial arteries, cardiac output and the period of isovolumetric contraction of left ventricle were measured prior to and by 15, 30 and 60 min post 4 mg corvaton sublingual administration in 20 patients with acute cardiac infarction by the third day after the disease onset (12--with normal diastolic pressure in pulmonary artery--under 1.87 kPa (14 mm Hg)--group I and 8--with elevated pressure--group II). The mean pressure in brachial artery was established to decrease more pronouncedly in group I (from 12.24 +/- 1.79 kPa (91.8 +/- 13.4 mm Hg to 10.45 +/- 1.61 kPa/78.4 +/- 12.1 mm Hg)--p less than 0.002) than in group II (from 11.96 +/- 1.49 kPa (89.11.2 mm Hg) to 11.22 +/- 1.32 kPa (84.2 +/- 9.9 mm Hg)--p less than 0.10). Heart rate was slightly accelerated in group I (from 83.6 +/- 6.21. min1 to 89.8 +/- 20.8.min-1--p less than 0.05) and in group II--an initial tendency to slow down (from 80.7 +/- 20.0.min-1 to 76.7 +/- 20.7.min61 beats, every 15 min, p less than 0.025). The pressure in pulmonary artery was slightly decreased in group I (average pressure--from 1.93 +/- 0.28 kPa (14.5 +/- 2.1 mm Hg) to 1.64 +/- 0.37 kPa (12.3 +/- 2.8 mm Hg, p less than 0.01), the decrease in group II was more manifested [average--from 3.96 +/- 0.61 kPa (29.7 +/- 4.6 mm Hg) to 3.29 +/- 0.77 kPa (24.7 +/- 5.8 mm Hg)--p less than 0.002 and diastolic--from 2.80 +/- 0.53 kPa (21.0 +/- 4.0 mm Hg) to 2.45 +/- 0.69 kPa (18.4 +/- 5.2 mm Hg)--p less than 0.01]. Those changes were accompanied by manifested reduction of cardiac index (from 3.02 +/- 1.06 to 2.47 +/- 0.61 1/min/m2, p less than 0.025), stroke index (from 36.2 +/- 10.4 to 29.1 +/- 6.9 cm3/m2, p less than 0.01) and stroke working index (from 42.1 +/- 14.7 to 29.2 +/- 9.0 g.m/m2, p less than 0.001) in group I, whereas in group II those indices under went no substantial changes (cardiac index--from 1.96 +/- 0.62 to 1.89 +/- 0.53 l/min/m3, stroke index--from 27.6 +/- 9.7 to 27.6 +/- 9.8 cm3/m2 and stroke working index--from 25.3 +/- 10.8 to 24.1 +/- 9.6 g.m/m2, p less than 00,1). The systemic vascular resitence and delta P/delta T of the left ventricle did not change in both groups (p less than 0,01). The changes in the hemodynamics developed gradually and were best manifested by the 60 min, but 50 per cent of the maximum effect was realized as early as the 15th min. Corvaton, was concluded, by the authors, to be useful in the treatment of the originated stasis cardiac insufficiency in those patients.