The feasibility and safety of the two-folding-formula were discussed by comparing the weight reduction effect and safety of the modified LAGBP group and the traditional LAGBP group for 1 year after operation.

24 patients were underwent the modified LAGBP procedure from July 2015 to December 2016 at General Hospital of PLA. From September 2011 to July 2015, 24 patients who underwent traditional LAGBP procedure were selected for preoperative indexes matching with modified LAGBP procedure. The matching indexes included gender, age, preoperative BMI. The operative time, intraoperative bleeding, hospital stay, postoperative complications and the percentage of excess weight loss (%EWL) at 1 year after operation were compared between the two groups.

Preoperative indicators of both groups were comparable except for age. The operation time of the modified group and the traditional group were (98±20) min and (87±17) min, respectively, with significant difference between the two groups (P<0.05). The bleeding volume in the modified group and the traditional group were (18.3±7.5) ml and (23.5± 11.7) ml, respectively, with no significant difference between the two groups (P>0.05). The hospitalization time was (4.5±0.7) days and (4.3±0.9) days in the modified group and the traditional group, respectively, with no significant difference between the two groups (P>0.05). The % EWL of the modified group and the traditional group at 12 months after operation were (63.77±11.26) % and (57.36±9.72) %, respectively, the difference was statistically significant (P<0.05). The two groups of %EWL had an upward trend in 1 years, and the increase of %EWL in the modified group was higher than that of the traditional group at 1-6 months after the operation. The postoperative complications of the modified group and the traditional group were 8.33% (2/24) and 12.5% (3/24), respectively, with no significant difference between the two groups (P>0.05).

LAGBP improved by the folding formula, the effect of weight loss was significantly increased, but there was no significant difference in postoperative complications. The folding formula "(1.5+x) / 2"based on 36 Fr bougie helps to standardize the LAGBP, provides a reference for the LAGBP multicenter study, and provides an idea for surgeries that require bougies.