Oliguria in Bariatric Surgery Not Tied to Intra-Op Fluids

Oliguria in laparoscopic bariatric surgery persists regardless of intra-op fluid administered

TUESDAY, Nov. 22 (HealthDay News) -- Morbidly obese patients undergoing laparoscopic bariatric surgery have low urine output, irrespective of the intraoperative fluid volume administered, according to a study published online Nov. 21 in the Archives of Surgery.

Idit Matot, M.D., from Tel Aviv University in Israel, and colleagues investigated whether intraoperative fluid management affects urine output in patients undergoing laparoscopic bariatric operations. In a randomized control trial, 55 and 52 morbidly obese patients were randomly assigned to receive high (10 mL/kg/hour) or low (4 mL/kg/hour) amounts of Ringer lactate solution intraoperatively, respectively. Urine output was the primary end point, while postoperative creatinine serum concentration and complication rate were the secondary end points.

The investigators found that patients in the high-volume group had significantly more fluids administered than patients in the low-volume group. Low urine outputs were not significantly different between the groups (median, 100 and 107 mL in the high and low volume groups, respectively; P = 0.34). At all times, the mean creatinine serum concentration was within the normal range, with no significant between-group differences (P = 0.68). The low-volume group had a nonsignificantly lower number of patients with complications than the high volume group (seven versus 10 patients; P = 0.60).

"In patients undergoing laparoscopic bariatric surgery, intraoperative urine output is low regardless of the use of relatively high-volume fluid therapy," the authors write.

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