Scorpion envenomation in Merida, Venezuela.

This study involves a review of the records of 64 children referred to the University of los Andes Hospital with the diagnosis of scorpion envenomation. The patients were divided into group 1 (local manifestations, 42.4%) and group 2 (systemic manifestations, 7.

Response of heart rate to atropine and left ventricular function in Chagas' heart disease.

Chagasic patients may have a normal or abnormal response of heart rate to atropine. To determine if this response to atropine is related to the degree of left ventricular dysfunction, we studied 33 patients with a positive complement fixation test for Chagas' disease. Eleven subjects, with atypical chest pain and negative complement fixation test, were used as controls (sero-negative).