The purpose of study is to evaluate the characteristics of intracardiac hemodynamics, and right ventricle (RV) and left ventricle (LV) diastolic function of patients with myocardial infarction (MI) of the posterior wall of the left ventricular (PW LV) with involvement of RV. 101 patients with acute MI of the PW LV aged 63.60±1.98 years were examined. 40 patients with MI of PW LV and involvement of RV were included into group I, 61 patients with isolated MI of PW LV – into group II. Doppler echocardiography was performed on 4–5 days of acute MI. Decreased thickness of interventricular septum and RV free wall were revealed in group I. Systolic RV para – meters in patients of I group were characterized by significant increase of right atrium (13.3%), diameter of RV (DRV) (14.9%), DRV / end-diastolic diameter LV (15.2%) and reduced contractility of RV (15%) compared to isolated infarction of PWLV (Р<0.05). The frequency of cases of pulmonary hypertension was significantly higher in group I (75%, Р<0.05), the average values of artery pulmonary pressure (APP) exceeded those in group II by 36.3% (Р<0.05). Pseudonormal type of RV diastolic dysfunction prevailed in patients with RV MI (82.5%) compared with patients in group II (37.8%) (Р<0.05), which was associated with marked dilatation of the LV, RV, pseudonormal and restrictive type of LV diastolic dysfunction and significantly higher values of APP (48.28±0.75 mm Hg, Р<0.05). RV diastolic disturbances were developed with some delay, compared to left ventricular diastolic dysfunction.