Search

The medical records of ten pediatric patients with a clinical diagnosis of tetanus were reviewed retrospectively. The heart rate and blood pressure of all tetanus patients were measured noninvasively every hour during the first two weeks of hospitalization. Six of ten tetanus patients presented clinical evidence of sympathetic hyperactivity (group A) and were compared with a control group consisting of four children who required mechanical ventilation for diseases other than tetanus (group B). Heart rate and blood pressure simultaneously and progressively increased to a maximum by day 7. The increase over baseline was 43.70 +/- 11.77 bpm (mean +/- SD) for heart rate (P<0.01) and 38.60 +/- 26.40 mmHg for blood pressure (P<0.01). These values were higher and significantly different from those of the control group (group B) at day 6, which had an average heart rate increase over baseline of 19.35 +/- 12.26 bpm (P<0.05) and blood pressure of 10.24 +/- 13.30 mmHg (P<0.05). By the end of the second week of hospitalization, in group A the increase of systolic blood pressure over baseline had diminished to 9.60 +/- 15.37 mmHg (P<0.05), but the heart rate continued to be elevated (27.80 +/- 33.92 bpm, P = NS), when compared to day 7 maximal values. The dissociation of these two cardiovascular variables at the end of the second week of hospitalization suggests the presence of asymmetric cardiac and vascular sympathetic control. One possible explanation for these observations is a selective and delayed action of tetanus toxin on the inhibitory neurons which control sympathetic outflow to the heart.

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, 7.8%). Seven of these patients had severe cardiorespiratory complications, came from distinct geographical zones and received antivenin. Our results indicate that poisonous and extremely dangerous scorpions predominate in certain geographical zones within the state of Merida, Venezuela.