[Functional morphology of the heart conduction system in acute myocardial infarct].

The results of histochemical, histoenzymological, and fluorescence microscopy studies of the conductive tissue of the heart in acute myocardial infarction in 30 fatal cases are presented. Focal decrease in redox and hydrolytic enzymes, monoaminoxidase, and cholinesterase in elementa of the conduction system as well as changes in the pattern of fluorescence of the specific muscle cells were found. The intensity of metabolic lesions was more pronounced at early stages of myocardial infarction in those cases where the conducting pathways were proximal to the foci of necrosis.