Obesity, Morbid Clinical Trial
Official title:
Effect of RYGB on Alpha- and Beta Cell Function and Sensitivity to Incretins in Patients With Type 2 Diabetes
The aim of the study is to investigate the effect of Roux-en-Y gastric bypass (RYGB) on pancreatic alpha and beta-cell function and for the sensitivity of incretin hormones in patients with pre-operative type 2 diabetes. Primary hypotheses: - After RYGB, the sensitivity to GLP-1 and GIP is improved (improved insulinotropic effect). - After RYGB, the insulin secretion improves during an oral glucose tolerance test within 3 months postoperatively. - After RYGB, the insulin secretion during intraveneous stimulation with glucose or non-glucose (arginin) is unchanged.
Design: 12 patients with type 2 diabetes will be recruited. All subjects will undergo 11 study visits: four visits before, three visits at 1 week after surgery and four visits at 3 months postoperatively: - Oral glucose tolerance tests (OGTTs) with measurement of GLP-1 and GIP secretion will be performed before and 3 months post-surgery. - Hyperglycemic clamps with co-infusion of saline, GLP-1 or GIP will be performed in a randomised order at three separate study visits in randomized order before, 1 week and 3 months after surgery. ;
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