新诊断2型糖尿病患者体重指数和年龄与胰岛功能关系的观察

目的 探讨新诊断2型糖尿病患者不同体重指数（BMI）和年龄与胰岛素敏感性及胰岛β细胞功能的关系.方法 对2006至2007年本院新诊断2型糖尿病住院患者304例,依照BMI分为BMI正常组（18.5≤BMI〈23.0）68例,超重组（23.0≤BMI＜25.0）69例,肥胖组（BMI≥25.0）167例,测定其血脂、空腹血糖、糖化血红蛋白,行口服糖耐量试验（OGTY）联合胰岛素及C肽测定,了解内稳态模型评估（HOMA）胰岛素抵抗指数（HOMA-IR）、胰岛素分泌指数（△I30/△G30）及校正后胰岛β细胞功能指数（MBCI）,评估胰岛功能.结果 ①肥胖组HOMA-IR及MBCI均显著高于BMI正常组及超重组（P＜0.05）,肥胖组△I30/△G30显著高于BMI正常组（P＜0.05）,多元线件回归分析显示BMI与HOMA-IR呈独立线性相关（P＜0.05）;②肥胖组中,年龄≥60岁者胰岛功能参数△I30/△G30及MBCI显著高于年龄＜60岁者（P＜0.05）.结论 新诊断2型糖尿病患者中非肥胖者胰岛素分泌缺陷较肥胖者明显;随BMI的增加,胰岛素抵抗程度加重.未发现年龄与胰岛β细胞功能或胰岛素敏感性存在明确相关性.

Relationship between pancreatic beta-cell function and body mass index and age in patients with newly diagnosed type 2 diabetes

Objective To investigate relationship between insulin sensitivity and beta-cell function with body mass index (BMI) and age in patients with newly diagnosed type 2 diabetes mellitus (T2DM).Methods Totally, 304 patients with T2DM newly-diagnosed at admission to the first hospital affiliated to Nanjing Medical University, Jiangsu province, during 2006 to 2007 were recruited in the study. The patients were divided into three groups based on WHO criteria of obesity in Asia Pacific Region in 2003, 68 cases with normal weight ( 18. 5≤ BMI ＜ 23.0), 69 in overweight (23.0 ≤ BMI ＜ 25.0), and 167 in obesity (BMI≥25.0). Fasting serum glucose, glycesylated hemoglobin Alc (HbAlc) and lipids were measured for all the subjects, as well as oral glucose tolerance test (OGTr), C-peptide releasing tests and determination of serum insulin performed. Homeostasis model assessment of insulin resistance index (HOMA-IR), insulinogenic index (AI30/AG30) and modified beta-cell function index (MBCI) werecalculated to evaluate their insulin sensitivity and beta-cell function of the islets. All these parameters werecompared between the three groups and subgroups. Results HOMA-IR and MBCI were significantly higherin T2DM patients with obesity than those in the groups with normal weight and over-weight ( P < 0. 05 ).AI30/AG30 in obesity group was significantly higher than that in the group with normal weight (P <0. 05).Multiple linear regression analysis showed that BMI independently correlated with HOMA-IR ( P < O. 05 ).Sub-group analysis showed that △I30/△G30 and MBCI were significantly higher in those aged 60 years and over with obesity than those in the groups aged less than 60 years ( P ＜ 0. 05 ). Conclusions Non-obese patients with newly diagnosed T2DM have more severe impaired insulin secretion than that in obese ones,and their insulin resistance increases with BMI. Age has no significant correlation with pancreatic beta-cell function or insulin sensitivity.