The Effects of Captopril on the Renin—Angiotensin System and the Sympathetic Nervous System During Sodium Nitroprusside-Induced Hypotension in the Halothane …

SW Stead, BC Bloor - Journal of cardiovascular pharmacology, 1990 - journals.lww.com
SW Stead, BC Bloor
Journal of cardiovascular pharmacology, 1990journals.lww.com
Abstract Three groups of New Zealand white rabbits were used to study the effects of
captopril on the renin-angiotensin system and sympathetic nervous system during sodium
nitroprusside (SNP)-induced hypotension and halothane anesthesia. Two groups of rabbits
(C and CH) were treated with captopril 2 mg/kg iv One captopril-treated group (CH) and the
third, untreated group (H) received SNP to induce hypotension. In these two groups, the
mean arterial blood pressure (MAP) was reduced by 40% for 150 min. Group C did not …
Abstract
Three groups of New Zealand white rabbits were used to study the effects of captopril on the renin-angiotensin system and sympathetic nervous system during sodium nitroprusside (SNP)-induced hypotension and halothane anesthesia. Two groups of rabbits (C and CH) were treated with captopril 2 mg/kg iv One captopril-treated group (CH) and the third, untreated group (H) received SNP to induce hypotension. In these two groups, the mean arterial blood pressure (MAP) was reduced by 40% for 150 min. Group C did not undergo SNP-induced hypotension and served to document the effects of captopril alone during the 150-min study period. Arterial blood samples for norepinephrine (NE), epinephrine (EPI), and plasma renin activity (PRA) were drawn prior to, during hypotension, and in the recovery period. The SNP dose required to maintain the hypotension was continuously recorded. NE, EPI, and PRA all increased in group H, indicating activation of both the reninangiotensin system and the sympathetic system during hypotension. This was accompanied by a dramatic increase in SNP dose requirement. In the CH group, PRA levels rose sharply and remained elevated. Plasma NE levels increased, while EPI levels remained unchanged with a decline in the SNP dose requirement. The C group demonstrated a rise in PRA levels, accompanied by unchanged NE and EPI levels and MAP during the study period. Captopril administration decreased the SNP dose requirement and significantly decreased the sympathetic response (measured by NE and EPI levels) in group CH as compared to the H group. This decreased sympathetic response to SNP-induced hypotension, as demonstrated by the C and CH groups, implies that captopril may effect the sympathetic nervous system in addition to the reninangiotensin system.
Lippincott Williams & Wilkins
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