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[Susceptibility of the myocardium to injury in decreased coronary circulation].

In the experiments intact dog hearts with ligated descendents, hearts with aorta insufficiency and others with a cardiopulmonary bypass were perfused. It was demonstrated that both ischaemia and relative oxygen deficiency induce within a comparatively short time the same type of irreversible damage in the structure of the subendocardial layers of the myocardium (lysis and rupture of the myofilament, swelling of the mitochondrium, rupture and lysis of the crista, clearing of the matrix). Consequently, the aimed protection of the myocardium during cardiac surgery is of the greatest importance.