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运用动态血糖监测系统比较不同糖耐量汉族人的胰岛β细胞功能

Pancreatic β-cell Functions Measured by Continuous Glucose Monitoring in Han Chinese with Varied Degree of Glucose Tolerance

  • 摘要: 目的 比较汉族人群中正常糖耐量(normal glucose tolerance,NGT)、糖尿病前期(prediabetes,PD)及新诊断2型糖尿病(newly-diagnosed type 2 diabetes mellitus,NDDM)者的胰岛β细胞功能;探讨运用动态血糖监测系统(continuous glucose monitoring system,CGMS)所计算出的葡萄糖曲线下面积(area-under-curve of glucose,AUC-G)用于描述胰岛β细胞功能的意义。方法 从普通汉族人群中筛选出未诊断糖尿病者,给予75 g口服葡萄糖耐量试验(OGTT)及胰岛素释放试验,记录受试者基本信息。共169例受试者最终纳入研究(男72例,女97例,年龄20~75周岁),体质量指数(body mass index,BMI)18.5~28.0 kg/m2,按照WHO1999诊断标准,分为NGT(n =87)、PD(n =52)、NDDM(n =30)3个组,检测3组受试者的三酰甘油(triglyceride,TG)、总胆固醇(total cholesterol,TC)、糖化血红蛋白A1c(glycosylated hemoglobin A1c,HbA1c)等生化指标。所有受试者均行72 h 动态血糖监测。采用OGTT和胰岛素释放试验检测值计算内稳态模型评估胰岛素抵抗(homeostasis model assessment insulin resistance,HOMA-IR)、内稳态模型评估胰岛β细胞功能(homeostasis model assessment β-cell function,HOMA-B)、基础分泌、早相分泌、二相分泌胰岛β细胞功能指标,用CGMS所测值计算AUC-G,并用多元逐步回归预测影响胰岛β细胞功能的因子。结果 与NGT比较,PD、NDDM的年龄、BMI、HOMA-IR、HOMA-B、基础分泌、早相分泌、二相分泌及AUC-G的差异均具有统计学意义(P <0.05);PD与NDDM比较,基础分泌、早相分泌、AUC-G差异有统计学意义(P <0.05),而年龄、BMI、HOMA-IR、HOMA-B及二相分泌差异均无统计学意义。多元逐步回归分析发现AUC-G 明显影响HOMA-B(标准偏回归系数β=-0.244,P =0.001)、胰岛素基础分泌(β=-0.355,P <0.001)及HbA1c(β=0.638,P <0.001)。结论 PD患者胰岛β细胞功能明显减低,早期主要表现在二相分泌功能减退。从PD发展至NDDM时,胰岛β细胞分泌功能的减退较躯体外周组织对胰岛素的抵抗增加更明显。AUC-G可作为评估胰岛β细胞功能损伤的较好指标。

     

    Abstract: Objective To compare the pancreatic β-cell functions of Han people between those with normal glucose tolerance (NGT),prediabetes (PD),and newly-diagnosed type 2 diabetes mellitus (NDDM), and to evaluate the value of the continuous glucose monitoring system (CGMS) in determining β-cell functions. Methods A total of 169 volunteers of Han people (20-75 years old, 72 male and 97 female) without diagnosed diabetes were given 75-g oral glucose tolerance test (OGTT) and insulin release tests. The body mass index (BMI) of the participants ranged from 18.5 to 28.0 kg/m2.They were categorized into NGT (n =87), PD (n =52) and NDDM (n =30) groups according to the World Health Organization (WHO) 1999 criteria.Blood samples were taken to test triglyceride

     

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