[Mechanism of myocardial injury during ischemic conditions and reperfusion--selected molecular and clinical aspects].

First, the author discusses phenomena seen in the myocardium during heart ischemia, and depicts dangerous period of so-called reperfusion in the paralysed area. A significance of free oxygen radicals and their origin with particular reference to their effects during reperfusion stage are emphasised. A possibility to use antioxidant agents to decrease a risk of clinical symptoms produced by reperfusion is also discussed.