[Comparative ultrastructural-morphometric studies of the human myocardium before and following heart surgery using myocardial protection].

Ultrastructural morphometric changes of the myocardium were reported after biopsy during the aortic occlusion time and during the reperfusion time throughout cardiosurgery in two groups of patients: Group AKB (aorto-coronary bypass): The mitochondria are increasing in the number and are decreasing in the size. The signs of biogenesis are shown. The condition after reperfusion is good. Group AVR (aortic valve replacement): The mitochondria are decreasing in the number and increasing in the size. These are signs of swelling and/or fusion. The condition after reperfusion is not so good. Therefore patients with AVR are a higher risk for cardiosurgery than the patients with chronic ischemic heart disease (AKB).