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Renin activity and aldosterone concentration in plasma and excretion of sodium and potassium in urine were measured during a period of 24 hours in 12 patients undergoing hysterectomy under general anaesthesia or epidural analgesia. Analgesia extended from T4 to S5 and was effective throughout the study. The normal stress-induced increase in plasma renin activity and aldosterone was inhibited by epidural analgesia. Urinary excretion of potassium was significantly lower in the epidural group, but sodium and water retention showed no difference between groups. It is concluded that neurogenic stimuli from the surgical area are important release mechanisms of the renin-aldosterone response to surgery. The results suggest that post-operative sodium retention is caused by factors other than the mineralocorticoid system.
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