[Electron microscopy and histochemical study of the neural apparatus of the heart in experimental myocardial infarct].

Electron microscopic study of intraorgan nervous ganglia and histochemical investigation of adrenergic innervation of rabbit heart in experimental myocardial infarction has been carried out. Changes in ganglia are shown to develop first of all in neuron bodies. Disturbances in ultrastructure of synaptic contacts are, as a rule, found from the third day of myocardial infarction. The amount of mediator in adrenergic terminalia is being reduced and there is a change in its distribution along the nerve fibers not only in the zone of the myocardial infarction but also in the zones beyond infarction. Intravenous infusion of nitroglycerin favours a retaining of the mediator in the neuronal depot.