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A well documented feature of Chagas disease is an extensive reduction in number of neuronal cell bodies in cardiac parasympathethic ganglia, and oesophageal and colonic myenteric plexus. This autonomic denervation has been suggested to play a role in the development of the late manifestations of Chagas disease, i.e. dilated cardiomyopathy, megacolon and megaoesophagus. Severe cardiac autonomic denervation also occurs in the acute experimental American trypanosomiasis in rats. The present study aims at verifying whether this denervation, as demonstrated histochemically, was accompanied by impairment of heart function, as assessed by the chronotropic response to the scorpionic (Tityus serrulatus) crude venom in the isolated rat heart preparation.

Autonomic denervation in the experimental American trypanosomiasis in rats: functional response to neurotoxins