Key result
SNP-induced hypotension under halothane is linked to parasympathetic withdrawal and sympathetic enhancement.
Why the study?
The autonomic control of heart rate during rapid arterial pressure changes induced by sodium nitroprusside in humans under halothane anesthesia was not fully characterized.
Population
10 informed human subjects under light halothane anesthesia (0.3-0.5% inspired concentration)
Comparison
Effects of propranolol and atropine on baroreflex control during SNP-induced hypotension
Design
Physiological study with beat-to-beat analysis of systolic pressure and pulse interval
Authors
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Highlights autonomic shifts with nitroprusside under halothane; leaves open relevance to modern perioperative practice.
The autonomic control of heart rate in response to rapid changes in arterial pressure induced by sodium nitroprusside is dominated by parasympathetic influence.
Chen et al. (1982) studied anesthetized subjects (n=10). Sodium nitroprusside (SNP) was evaluated on Baroreflex control of heart rate (slope of SP-PI plot). Sodium nitroprusside-induced hypotension during halothane anesthesia is associated with a withdrawal of parasympathetic inhibition and an enhancement of sympathetic activity.
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