Postprandial proximal gastric acid pocket and gastric pressure in patients after gastric surgery


  • Meeting presentation: Poster presentation, Digestive Disease Week (DDW), May 1–5, 2010, New Orleans, USA.

Address for Correspondence
Dr. Fernando A. M. Herbella, Surgical Gastroenterology, Division of Esophagus and Stomach, Hospital Sao Paulo, Rua Diogo de Faria 1087 cj 301, Sao Paulo, SP 04037-003, Brazil.
Tel: +55 11 99922824; fax: +55 11 39267610;


Background  An unbuffered postprandial proximal gastric acid pocket (PPGAP) has been demonstrated in normal individuals (NI) and patients with gastro-esophageal reflux disease (GERD). The role of gastric anatomy and gastric motility in the physiology of the PPGAP remains elusive. This study aims to analyze the correlation of PPGAP with proximal gastric pressure after gastric surgery.

Methods  A total of 26 individuals were studied: eight patients after open Roux-en-Y gastric bypass (RYGB) for morbid obesity, six patients after laparoscopic Nissen fundoplication for GERD, seven patients after open subtotal gastrectomy for gastric cancer and five NI. Patients underwent high resolution manometry to identify the location of the lower border of the lower esophageal sphincter (LBLES) and measure gastric pressure 1, 2, 3, 4 and 5 cm below the LBLES, immediately before swallow and after the end of the LES relaxation. A station pull-through pH monitoring was performed in all but NI, from 5 cm below the LBLES to the LBLES in increments of 1 cm in a fasting state and 10 min after a standardized fatty meal.

Key Results  Our results show that: (i) proximal gastric pressures are lower after swallow compared with before swallow in NI; (ii) patients after gastric surgery tend to have higher gastric pressure before and lower after swallow compared with NI and (iii) patients after RYGB with PPGAP have an increased gastric pressure after swallows in the segment where the PPGAP is noticed.

Conclusions & Inferences  Gastric motility may play a role in the genesis of PPGAP in patients after RYGB. The contribution of gastric motility for the genesis of PPGAP is still elusive in other patients.