Why the study?
Does repetitive supramaximal nerve stimulation reveal neuromuscular transmission abnormalities in patients with chronic Chagas' disease?
Does repetitive supramaximal nerve stimulation reveal neuromuscular transmission abnormalities in patients with chronic Chagas' disease?
Patients with chronic Chagas' disease may develop impairment of neuromuscular transmission, presenting as decremental or enhanced muscle responses.
May indicate neuromuscular transmission impairment in chronic Chagas disease; leaves open whether electrodiagnostic testing should enter routine evaluation.
An electrophysiological investigation of the state of the neuromuscular transmission (nmt) was carried out in 58 patients with the diagnosis of chronic Chagas' disease. On repetitive supramaximal nerve stimulation it was found that some patients did not show abnormalities, others had decremental muscle responses, others developed enhancement of the muscle evoked potential amplitudes, while some other patients combined both types of pathological responses. The findings suggest that some patients with chronic Chagas' disease develop impairment of nmt, though data obtained in this study do not give information about neither the type of impairment nor the localization (pre or postsynaptic, or both) of the damage.
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Erro et al. (1989) studied this question.
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