[Structural-functional changes in the myocardium of rats following pulmonectomy]

A complex of functional and morphologic methods was used to study the specific features of adaptation processes in various parts of the heart after right pneumonectomy in chronic experiments on 84 male albino rats with pulmonary hypertension. Various compensatory-adaptational processes developed in different parts of the myocardium, but increase of the mass prevailed with predominant hypertrophy of the right ventricle (76.2%). Study of the heart rhythm showed that prolonged hyperfunction of the cardiac muscle was attended by various types of regulatory relations with prevalence of dysregulation and vagotonic type rhythmic activity of the heart, which was evidence of significant reduction of the adaptative properties of the organism.