A course-wise administration of sodium selenate (30 gamma/kg), alpha-tocopherol (50 mg/kg) and of their combination in the same doses brings down the catecholamines content in the heart and suprarenals in the acute period of developing myocardial infarction (2nd day) with its subsequent normalization on the 14th day. Under the effect of these drugs the proportion of acetylcholine-like substances in the heart with experimental infarction rises at the expense of an accruing free (unbound with protein) fraction. The cholinesterase activity then gets intensified in the acute period and becomes normal by the 14th day.