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Abnormal glucose tolerance testing after gastric bypass.
MedLine Citation:
PMID:  22398113     Owner:  NLM     Status:  Publisher    
BACKGROUND: Symptoms secondary to dumping have been suggested to help patients refrain from simple carbohydrate ingestion after Roux-en-Y gastric bypass (RYGB). During follow-up examinations, we noted many patients with weight regain complaining of fatigue shortly after eating. Thus, we decided to study the glucose tolerance test (GTT) results in a cohort of post-RYGB patients. METHODS: A total of 63 RYGB patients, >6 months postoperatively, were studied with a GTT and measurement of insulin levels. The mean age was 48.5 ± 10.8 years, mean preoperative body mass index was 49.0 ± 6.5 kg/m(2), mean percentage of excess body mass index lost was 64.5% ± 29.0%, mean weight regain at follow-up was 11.6 ± 12.4 lb, and mean follow-up period was 47.9 months. RESULTS: Of the 63 patients, 49 had abnormal GTT results. Of the 63 patients, 6 were diabetic; however, only 1 of these patients had an elevated fasting glucose level. All 6 patients were diabetic preoperatively. Of the 63 patients, 43 had evidence of reactive hypoglycemia at 1-2 hours after the glucose load. Of these patients, 22 had a maximum/minimum glucose ratio >3:1, including 7 with a ratio >4:1. CONCLUSION: The results of the present study have demonstrated that an abnormal GTT result is a common finding after RYGB. Reactive hypoglycemia was found in 43 of 63 patients, with insulin values that do not support nesidioblastosis. It is our hypothesis, that rather than preventing simple carbohydrate ingestion, the induced hypoglycemia that occurs might contribute to weight regain and maladaptive eating in certain post-RYGB patients.
Mitchell S Roslin; Jonathan H Oren; Barrett N Polan; Tanuja Damani; Rachel Brauner; Paresh C Shah
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-27
Journal Detail:
Title:  Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery     Volume:  -     ISSN:  1878-7533     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-3-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101233161     Medline TA:  Surg Obes Relat Dis     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2010 American Society for Metabolic and Bariatric Surgery. Published by Elsevier Inc. All rights reserved.
Department of Surgery, Lenox Hill Hospital, New York, New York.
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