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We have studied the effect of the preoperative administration of bile salts on postoperative renal function in jaundiced patients undergoing surgery. Nine patients did not receive bile salts and in this group there were 2 cases of acute renal failure in the postoperative period. Furthermore, creatinine clearance values fell in this group from a mean value of 85 ml/min preoperatively to a mean postoperative value of 55 ml/min. Nine patients received preoperative bile salts with no case of renal failure. Creatinine clearance values increased in all but 2 patients from a mean preoperative value for the group of 79 ml/min to a mean postoperative value for the group of 99 ml/min. The difference between the changes in creatinine clearance in the two groups was statistically significant (P < 0·01). The results of this study suggest that the oral administration of bile salts to jaundiced patients in the preoperative period prevents …