[Therapeutic effect of laparoscopic Roux-en-Y gastric bypass in non-obese patients with type 2 diabetes].

Objective To evaluate the effectiveness of laparoscopic Roux-en-Y gastric bypass (LRYGB) surgery for treatment of type 2 diabetes (T2D) in patients with a body mass index (BMI) l 27.5 kg/m2. Methods We retrospectively analyzed the data of patients who underwent LRYGB surgery from March, 2012 to June, 2018 in the General Hospital of Guangzhou Military Command and Jinshazhou Hospital of Guangzhou University of Chinese Medicine. The changes in the parameters of glucose metabolism and physical indicators of the patients in the first, second and third years after the surgery were analyzed in patients in low BMI group and high BMI group. Results All the 74 patients underwent LRYGB successfully without conversion to open surgery. One year after the surgery, fasting blood glucose (FBG), HbA1c, postprandial blood glucose, fasting insulin, HOMA-IR, fasting C-peptide, BMI, body weight and waistline were significantly improved compared with their preoperative values in low BMI group (P l 0.05). At 2 years after the operation, FBG, HbA1c, postprandial blood glucose, HOMA-IR, BMI, body weight and waistline were significantly improved compared with the preoperative values in low BMI group (P l 0.05). In the third year, FBG, HOMA-IR, fasting C-peptide, body weight and waistline were significantly improved compared with the preoperative values in low BMI group (P l 0.05). There was no significant difference in the parameters of glucose metabolism and islet function between low BMI group and high BMI group at different stages. No serious complications occurred in these patients after the surgery. Conclusions LRYGB is effective for treatment of T2D in Chinese patients with a BMI l 27.5. After the surgery, the patient show reduced waistline without significant weight loss. The long-term results of the surgery still require further investigations with a larger samples and longer follow-up.