On the material of endomyocardial and intraoperation biopsies from patients with noncoronarogenic heart diseases (dilated and diabetic cardiomiopathies, paroxysmal arrhythmia, arrhythmogenic right ventricular dysplasia) on semithin and ultrathin sections there was studied myocardial microcirculation bed. By morphometry there was found the decrease of capillaries density of myocardial bed, degenerative changes in endothelial cells and microthrombosis. It was supposed that these changes are the factors of progression of heart failure.