[Manometric study of vertical banded gastroplasty for morbid obesity].

Morbidly obese patients undergoing vertical banded gastroplasty were studied preoperatively and/or postoperatively to characterize its manometric pattern. The esophageal manometry using station pull through technique involved 14 preoperative patients with a mean age of 28 +/- 7 years who were a obesity index of 220 +/- 32% and 14 postoperative patients with a mean age of 30 +/- 7 years who were a obesity index of 158 +/- 23%. Preoperative lower esophageal sphincter (LES) pressure using gastric base line as O was 16.1 +/- 8.5 cmH2O and a LES length of 3.4 +/- 0.9 cm. Postoperatively, the vertical banded gastroplasty channel had a pressure of 17.7 +/- 7.1 cmH2O and a length of 8.2 +/- 1.7 cm which was higher than gastric base line. No difference was seen between preoperative LES pressure and postoperative channel pressure, however postoperative channel length was significantly (p less than 0.01) larger than preoperative LES length. We concluded that vertical banded gastroplasty for morbid obesity created a longer high pressure zone in accordance with channel which would inhibit reflux of gastric juice.