[Differential diagnosis of myocardial dystrophy of different etiology developing after physical overexertion].

A total of 46 sportsmen with dystrophy of the myocardium due to chronic physical overexertion were subjected to an electrocardiographic examination in conjunction with functional tests (orthostatic, physical load tests, potassium chloride and inderal tests). The derangement of the repolarization phase on the ECG arising in myocardial dystrophy on account of physical overexertion was found to have a diverse genesis and can be caused by the development of neurodystrophy, disorders in the electrolytes metabolism (substantial losses of potassium) and by myodystrophic cardiosclerosis. The available data made it possible to educe criteria for differential diagnosis of myocardial dystrophy of diverse genesis arising due to physical overexertion.