Abstract
Laparoscopic sleeve gastrectomy (LSG) proved to be a valuable procedure for treating obesity complicated by type 2 diabetes mellitus (T2DM). The mechanism of T2DM resolution after LSG is not yet clearly defined. The objective of the study was to investigate the effect of LSG on the secretion of GLP-1 in patients with T2DM associated with obesity. Plasma GLP-1 levels were evaluated by starvation and 15, 30, 60 and 90 min after the standard carbohydrate preload for breakfast, which included 125 ml of balanced high energy Nutricia Nutridrink Protein. Evaluations were made on the eve of the procedure, for 4 days and 3 months after the operation. In 7 patients with T2DM were diagnosed for the first time, in 3 patients with diabetic history 2 years, in 1 patient – 3.5 years and in 1 patient – 10 years. Mean glycated hemoglobin before surgery was 7.7 ± 1.6%, 3 months after LSG – 5.9 ± 0.4%. The concentration of GLP-1 in 30 minutes before surgery was 6.7 ± 0.9 ng/ml. On the 4th day after LSG, the mean level of GLP-1 was 9.6 ± 0.2 ng/ml, which statistically differed from its level in the pre-operative period, and after 3 months the mean level of GLP-1 statistically increased to 13.7 ± 0.3 ng/ml. Thus LSG leads to an early and significant increase in post-prandial secretion GLP-1 in T2DM patients associated with obesity. The rapid postoperative improvement in signs of carbohydrate metabolism indicates the importance of the incretin effect LSG in the implementation of early compensation mechanisms for T2DM and explains the metabolic activity of this operation.
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