The overall rate of cholecystectomy after weight loss surgery is low, but it is more likely to occur among patients who experience excessive weight loss following their procedure and those who undergo laparoscopic Roux-en-Y gastric bypass.
Analysis of prospective data from 1,398 patients undergoing bariatric surgery showed an overall cholecystectomy rate of 7.8% over a median follow-up of 49 months, with the frequency higher in the first 6 months, according to data published in Surgery for Obesity and Related Diseases.
Dr Victor Tsirline
Cholecystectomy rates were significantly higher among individuals who underwent laparoscopic Roux-en-Y gastric bypass (LRYGB), compared with those who received a laparoscopic adjustable gastric band (LAGB) or laparoscopic sleeve gastrectomy (LSG) (10.6% vs. 2.9% vs. 3.5%, P = .001).
"Although the LRYGB was the procedure associated with the highest rate of cholecystectomy, the present study found that this relationship was due to the superior %EWL [percent excess weight loss] associated with this procedure, compared with the LAGB and LSG procedures," wrote the late Dr. Victor B. Tsirline of Northwestern Memorial Hospital, and his colleagues.
Patients who lost more than a quarter of their weight within 3 months of surgery showed significantly higher rates of cholecystectomy, and there was a 25% increase in cholecystectomy per 10% of excess weight loss within the first 3 months after weight loss surgery, although this association was only significant among patients treated with gastric bypass (Surg. Obes. Relat. Dis. 2014;10:313-21).
There were statistically significant differences in cholecystectomy rates performed by the three surgeons involved, although again, this was only in patients who had undergone gastric bypass, and researchers said this could be partly attributed to the fact that one surgeon saw a greater proportion of revision patients.
Researchers also noted an interaction with race, as black patients had significantly lower rates of cholecystectomy, compared with white patients (2.2% vs. 8.9%, P = .0001), and Native American patients showed the highest rates of all (65%).
This study found no difference in cholecystectomy rates between patients taking ursodiol and those who weren’t.
Rapid weight loss after bariatric surgery is associated with an increased risk of gallstones, and routine cholecystectomy at the time of bariatric surgery has been the subject of considerable debate.
Those in favor argue that it prevents the morbidity of symptomatic cholelithiasis and avoids the risk of duct stones which can be difficult to treat after gastric bypass.
However opponents say routine cholecystectomy would prolong hospital stays, lengthen operating times, and potentially increase complication rates, when the use of ursodiol after weight loss surgery has been shown to decrease the frequency of gallstones.
"The findings of the present study indicate that a conservative approach to cholecystectomy, rather than prophylactic cholecystectomy, is warranted, because only 7.8% of patients developed symptomatic gallbladder disease within 4 years on average," researchers wrote.
"Furthermore, there are technical advantages of delayed cholecystectomy that stem from reduced intra-abdominal fat content and decreased liver size secondary to weight loss."
There were no conflicts of interest declared.