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Canadian Journal of Anesthesia, Vol 27, 471-474, Copyright © 1980 by Canadian Anesthesiologists' Society

Effect of Total Sympathetic Blockade on Plasma Renin Activity During Surgery

MURALI SIVARAJAN 1 and DAVID W. AMORY 1

1 Department of Anesthesiology, RN-10, University of Washington, Seattle, Washington 98195, U.S.A.

The interaction of sympathetic blockade and decreased mean arterial pressure on plasma renin activity during surgery was studied in dogs. Plasma renin activity was measured during lumbar laminectomy before and after sympathetic blockade produced by subarachnoid spinal anaesthesia. Plasma renin activity was significantly increased during laminectomy. Twenty minutes after sympathetic blockade there were marked decreases in mean arterial pressure and plasma renin activity; but with mean arterial pressure continuing to decline, plasma renin activity showed moderate increases at 50 minutes after sympathetic blockade. It is concluded that increases in plasma renin activity seen during surgical operations can be attenuated by sympathetic blockade produced by subarachnoid or epidural spinal anaesthesia, although decreases in mean arterial pressure resulting from the sympathetic blockade continue to provide a stimulus for renin secretion.






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Copyright © 1980 by the Canadian Anesthesiologists' Society.