糖尿病前期患者血清脂联素和超敏C反应蛋白水平分析

目的探讨血清脂联素、超敏C反应蛋白(hs-CRP)水平变化与糖尿病前期发生的危险因素的关系。方法选取健康对照组(NGT)、糖耐量减低组(IGT)、空腹血糖受损合并糖耐量减低组(IFG/IGT)各100例,测定各受试者血清脂联素、hs-CRP、空腹胰岛素、空腹血糖、餐后2 h血糖,应用稳态模型评估法评价胰岛素抵抗。结果 IGT组、IFG/IGT组血清脂联素均显著低于NGT组(P<0.01),IFG/IGT组的脂联素水平低于单纯IGT组(P<0.05)。脂联素水平与空腹血糖、餐后2 h血糖、胰岛素抵抗指数(HOMA-IR)呈负相关(P值均小于0.01)。单纯IGT组、IFG/IGT组血清hs-CRP水平明显高于NGT组(P<0.01),IFG/IGT组血清hs-CRP水平高于单纯IGT组(P<0.05)。血清hs-CRP水平与空腹血糖、餐后2 h血糖、HOMA-IR呈正相关(P值均小于0.01)。结论血清脂联素、hs-CRP可能是加重糖尿病前期胰岛素抵抗的危险因素,糖调节受损期即可能存在慢性低度炎症反应。在糖尿病前期,脂联素、hs-CRP可能参与了糖尿病的发生及发展。     

不同糖耐量人群胰岛素抵抗指数及血管内皮功能变化的意义

目的探讨空腹血糖调节受损(IFG)、糖耐量减低(IGT)、糖尿病(DM)等高血糖人群的胰岛素抵抗指数(IR)及血管内皮功能变化的意义。方法选择不同糖耐量且不伴心血管及其他疾病的183例,按糖耐量分为IFG组47例、IGT组52例、DM组41例、糖耐量正常组(NGT)43例,分别检测血糖、胰岛素、血脂,计算IR,并应用高分辨率血管外超声监测肱动脉血管内皮功能,比较各组空腹血糖、餐后2 h血糖、IR及血管内皮功能。结果IFG组、IGT组、DM组空腹胰岛素及餐后胰岛素均高于NGT组,差异有统计学意义(P<0.05);DM组空腹胰岛素高于IGT组,而DM组餐后胰岛素高于IFG组及IGT组,IGT组餐后胰岛素高于IFG组,差异均有统计学意义(P<0.05);IFG组、IGT组、DM组的IR高于NGT组;反应性充血时肱动脉血管内径变化在NGT组、IFG组、IGT组、DM组依次降低,两两比较差异均有统计学意义(P<0.05)。结论IGT人群表现出IR增高,发展到DM阶段更为严重,在血糖升高的同时往往合并脂代谢紊乱;IGT期血管内皮功能开始下降,至DM期更为明显。     

腹型肥胖人群中不同糖代谢水平者胰岛素抵抗及胰岛分泌功能的探讨

目的 探讨腹型肥胖人群中不同糖代谢水平者胰岛素抵抗及胰岛分泌功能的状态。方法 腹型肥胖患者共382例，其中正常糖耐量(NGT)组251例，空腹血糖异常(IFG)组40例，异常糖耐量(IGT)组41例，2型糖尿病(DM组)50例。测腰围、血压、空腹血脂、血糖及血浆胰岛素，应用稳态模式胰岛素抵抗指数(HOMA-IR)作为胰岛素抵抗指标，稳态模式胰岛B细胞功能指数(HBCI)作为胰岛素分泌指标。结果 在腹型肥胖的人群中，不同糖代谢组的HOMA-IR差异具有统计学意义，从NGT→IFG／IGT→DM组HOMA-IR逐渐升高，而HBCI在各组内变化较大，数值分布较分散，与NGT、IFG、IGT组相比，DM组的HBCI明显下降，差别有统计学意义。同时收缩压随着糖代谢的恶化从NGT、IGT IFG到DM组逐步升高，舒张压的变化无明显的规律。结论 腹型肥胖人群中，从NGT经IFG／IGT向2型糖尿病发展的过程中，胰岛素敏感性逐渐下降，β细胞胰岛素分泌功能明显下降是出现DM的主要原因。这一结果与其他种族中的研究结果不完全相同，提示即使是肥胖相关的2型糖尿病，种族、遗传因素仍然在糖尿病发展过程中发挥着重要作用。     

老年人不同糖耐量状态胰岛素抵抗和胰岛β细胞功能的研究

目的观察老年人群中空腹血糖受损(IFG)、糖耐量受损(IGT)和糖调节受损(IFG/IGT)三种不同糖耐量状态下的胰岛素抵抗(IR)和胰岛β细胞功能的变化,了解其发病机制。方法筛选60~75岁的IFG40例,IGT60例,IGT/IFG40例,正常糖耐量(NGT)70例。HOMA-IR评价胰岛素抵抗,HBC I和I30/G30分别评价基础及糖负荷后早期胰岛β细胞功能。结果(1)HOMA-IR:IFG、IFG/IGT和IGT组明显高于NGT组,P<0.01,IFG/IGT组高于IFG和IGT组,P<0.01;(2)HBC I:IFG组和IFG/IGT组明显低于NGT和IGT组,P<0.01;(3)I30/G30:IGT组和IFG/IGT组明显低于NGT组及IFG组,P<0.01。结论老年人群IFG主要表现基础状态下β细胞功能受损伴有胰岛素抵抗,IGT主要表现为早期胰岛素分泌缺陷,IFG/IGT胰岛β细胞早期胰岛素分泌功能受损更明显,胰岛素抵抗更严重。     

糖耐量减低者胰岛素抵抗、胰岛B细胞功能及相关代谢指标分析

目的分析糖耐量减低者的胰岛素抵抗、胰岛B细胞功能及相关代谢指标。方法根据口服葡萄糖耐量试验(OGTT),将243例入选者分为糖耐量减低组(IGT组,108例)及糖耐量正常组(NGT组,135例),测定空腹及服糖后2小时胰岛素(2 hINS)、空腹甘油三酯(TG)、胆固醇(TC)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)、游离脂肪酸(FFA),计算胰岛素抵抗指数(HOMA-IR)、胰岛素分泌指数(HOMA-β)及葡萄糖处置指数(DI)。结果①IGT组HOMA-IR水平显著高于NGT组(0.56±0.25 vs 0.40±0.20,P<0.01);②IGT组DI水平显著低于NGT组(1.66±0.16 vs 2.66±0.21,P<0.01);③IGT组TG、FFA、FINS2、hINS显著高于NGT组(P<0.01),HDL-C显著低于NGT组(P<0.01);两组间TC、LDL-C、HOMA-β差异无统计学意义(P>0.05)。结论糖耐量减低者以胰岛素抵抗及高胰岛素血症为主,脂毒性在这一过程中起重要作用。     

糖代谢异常患者胰岛素抵抗和胰岛β细胞功能与血清高半胱氨酸的相关性分析

摘要:目的：探讨糖代谢异常人群胰岛素抵抗和胰岛β细胞功能与高半胱氨酸(Hcy)的关系。 方法：对67例糖耐量正常（NGT）者及104例糖耐量受损（IGT）、58例空腹血糖调节受损（IFG）、109例2型糖尿病（T2DM）患者,检测空腹血糖（FPG）、口服葡萄糖耐量试验（OGTT) 2 h血糖、Hcy及空腹胰岛素水平,计算稳态模型评估胰岛素抵抗指数(HOMA-IR)、HOMA胰岛β细胞功能指数(HBCI)、空腹胰岛β细胞功能指数(FBCI)。 结果：与NGT、IFG组比较,IGT组HOMA-IR、HBCI、Hcy差异有统计学意义（P均<0.05）;与NGT、IFG、IGT组比较,T2DM组HOMA-IR、HBCI、FBCI、Hcy差异有统计学意义（P均＜0.05）。Hcy与HOMA-IR呈正相关（r=0.233,P<0.05）,与HBCI、FBCI呈负相关（r分别为－0.354、－0.289,P均<0.05）。 结论：Hcy与葡萄糖代谢异常有相关性,可作为评价胰岛素抵抗、胰岛β细胞分泌功能受损的一项观察指标。     

糖调节受损患者血清超敏C反应蛋白和细胞间黏附分子-1水平的变化

目的检测空腹血糖调节受损(IFG)及糖耐量减低(IGT)人群空腹血清超敏C反应蛋白(hs-CRP)、细胞间黏附分子-1(ICAM-1)水平,探讨血清hs-CRP、ICAM-1与胰岛素抵抗(IR)之间的关系。方法选取健康对照组30例,IFG组30例,IGT组30例,IFG并IGT组30例,新发2型糖尿病组(T2DM)30例。对所有受试者空腹测血清hs-CRP、ICAM-1、血糖、甘油三酯、胆固醇、高密度脂蛋白胆固醇、低密度脂蛋白胆固醇、空腹胰岛素等(FINS)项目,应用稳态模型评估法评价胰岛素抵抗指数(HOMA-IR)。结果各试验组的FINS、空腹血糖(FBG)、HOMA-IR均高于正常对照组,差异有显著性(P<0.05);IGT组、IFG并IGT组、T2DM组的CRP、ICAM-1高于正常对照组,差异有显著性(P<0.05);CRP、ICAM-1在IFG组与正常组之间无显著性差异(P>0.05)。T2DM组的FINS、FBG、HOMA-IR、CRP、ICAM-1高于IGT组,差异有显著性(P<0.05),IFG并IGT组与IGT组比较,上述指标均无显著性差异(P>0.05)。逐步多元回归分析显示,BMI、hs-CRP、ICAM-1是影响HOMA-IR的重要危险因素。结论 (1)T2DM组、糖调节受损人群(包括IFG、IGT、IFG并IGT)存在明显的胰岛素抵抗,CRP、ICAM-1、BMI是胰岛素抵抗的危险因素;(2)随着糖耐量受损的加重,血清hs-CRP、ICAM-1水平逐渐升高;(3)糖调节受损时期即可能存在内皮功能损伤,并出现大血管病变的一些病理生理改变(如急性时相蛋白CRP,ICAM-1)。     

瘦素与老年患者胰岛素抵抗和胰岛功能的相关性

目的:探讨瘦素是否与老年患者包括临床糖尿病(DM)、糖耐量减低(IGT)、空腹血糖调节受损(IFG)类型胰岛素抵抗和胰岛功能等指标相关联.方法:选择临床2型糖尿病患者40例(T2DM组),IGT患者30例(IGT组),IFG患者30例(IFG组)和正常对照组30例,检测各组循环瘦素、胆固醇、甘油三酯、高密度脂蛋白胆固醇、空腹血糖(FPG)、餐后2 h血糖、空腹胰岛素(FINs)、餐后2 h胰岛素、糖化血红蛋白(HbA1c)、C-肽等指标,用稳态模式(Homa Model)公式评估胰岛素抵抗指数(HOMA-IR)和胰岛β细胞功能指数.结果:T2DM组、IGT组和IFG组瘦素水平(*9滋g)分别为4.27 ± 1.82、4.15 ± 1.96、4.19 ± 1.9,高于正常对照组的2.43 ± 0.31;HOMA-IR数值分别为3.48 ± 0.84、3.01 ± 0.67、3.24 ± 0.26,高于正常对照组的1.23 ± 0.42;FINs、FPG、C-肽、HbA1c均高于正常对照组(P ＜ 0.01);T2DM组、IGT组和IFG组在校正胰岛素抵抗后的胰岛细胞功能分别为178 ± 49、165 ± 59、170 ± 52,低于正常对照组的346 ± 54.多元逐步回归分析显示:FPG、FINS、C-肽、HbA1c、瘦素水平是影响HOMA-IR的独立危险因素.结论:老年患者循环瘦素水平的升高是胰岛素抵抗和胰岛*9茁细胞功能缺陷的危险因素.     

不同糖耐量人群胰岛素抵抗的比较

【目的】研究不同糖耐量人群胰岛素抵抗程度的差异。【方法】将412名门诊患者按OGTT分为4组：糖尿病组（NDM，n=180），空腹血糖受损组（IFG，n=35），糖耐量异常组（IGT，n=46），糖耐量正常组（NGT，n=151）。测定血压、血脂（TG和HDL）、体质指数（BMI）；应用胰岛素抵抗（HOMA-IR）及胰岛素作用指数（IAI）对不同糖耐量人群进行测定。【结果】DM、IFG及IGT组均较NGT组IAI下降，HOMA-IR增高，DM组表现得尤为显著；而IFG组与IGT组比较，亦有显著的IAI下降及HOMA-IR增高（P〈0．05）。【结论】不同糖耐量人群随着糖调节不同程度的受损HOMA-IR和IAI均有增幅变化，这两种指标可较准确的评估胰岛素敏感性。IFG与IGT人群胰岛素抵抗的机制可能有所不同。     

血糖调节异常者血脂代谢的初步研究

目的初步评价血糖调节受损患者血脂代谢异常情况。方法检测糖耐量正常(NGT)、单纯空腹血糖异常(IFG)、单纯糖耐量异常(IGT)、空腹血糖异常合并糖耐量异常(IFG IGT)和糖尿病(DM)患者空腹血糖和餐后2 h血糖及空腹血清总胆固醇(TC)、三酰甘油(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)、载脂蛋白A-I(apo A-I)和载脂蛋白B(apo B)水平,计算非高密度脂蛋白胆固醇(non-HDL-C)和血浆致动脉硬化指数(AIP),比较各组间血清脂质成分的差异。结果IFG组血清TC、LDL-C、non-HDL-C和apo B水平较NGT组明显升高(P<0.01),而TG、HDL-C、AIP差异无统计学意义(P>0.05)。IGT组血清TC、TG、LDL-C、non-HDL-C、apo A-I、apo B和AIP水平较NGT组显著升高(P<0.01),前6项指标与IFG IGT组差异无统计学意义(P>0.05)。IFG IGT组与NGT组比较,各指标差异均有统计学意义(P<0.01);HDL-C、non-HDL-C和AIP水平与IFG组比较差异有统计学意义(P<0.01)。DM组表现出典型的DM性脂代谢紊乱伴AIP水平显著异常。non-HDL-C和apo B间存在良好的相关性(P<0.01)。结论血糖调节受损者不同程度的存在血脂代谢异常,主要表现为TC、TG、LDL-C、non-HDL-C和apo B水平的升高和HDL-C、apo A-I的降低,伴不同程度AIP水平的改变。     

Different mechanisms for impaired fasting glucose and impaired postprandial glucose tolerance in humans

OBJECTIVE: To compare the pathophysiology of impaired fasting glucose (IFG) and impaired glucose tolerance (IGT) in a more comprehensive and standardized fashion than has hitherto been done. RESEARCH DESIGN AND METHODS: We studied 21 individuals with isolated IFG (IFG/normal glucose tolerance [NGT]), 61 individuals with isolated IGT (normal fasting glucose [NFG]/IGT), and 240 healthy control subjects (NFG/NGT) by hyperglycemic clamps to determine first- and second-phase insulin release and insulin sensitivity. Homeostasis model assessment (HOMA) indexes of beta-cell function (HOMA-%B) and insulin resistance (HOMA-IR) were calculated from fasting plasma insulin and glucose concentrations. RESULTS: Compared with NFG/NGT, IFG/NGT had similar fasting insulin concentrations despite hyperglycemia; therefore, HOMA-IR was increased approximately 30% (P < 0.05), but clamp-determined insulin sensitivity was normal (P > 0.8). HOMA-%B and first-phase insulin responses were reduced approximately 35% (P < 0.002) and approximately 30% (P < 0.02), respectively, but second-phase insulin responses were normal (P > 0.5). NFG/IGT had normal HOMA-IR but approximately 15% decreased clamp-determined insulin sensitivity (P < 0.03). Furthermore, HOMA-%B was normal but both first-phase (P < 0.0003) and second-phase (P < 0.0001) insulin responses were reduced approximately 30%. IFG/NGT differed from NFG/IGT by having approximately 40% lower HOMA-%B (P < 0.012) and approximately 50% greater second-phase insulin responses (P < 0.005). CONCLUSIONS: Since first-phase insulin responses were similarly reduced in IFG/NGT and NFG/IGT, we conclude that IFG is due to impaired basal insulin secretion and preferential resistance of glucose production to suppression by insulin, as reflected by fasting hyperglycemia despite normal plasma insulin concentrations and increased HOMA-IR, whereas IGT mainly results from reduced second-phase insulin release and peripheral insulin resistance, as reflected by reduced clamp-determined insulin sensitivity.     

Immunoglobulin E and mast cell proteases are potential risk factors of impaired fasting glucose and impaired glucose tolerance in humans

Aim. Mast cells are important in experimental diabetes. Plasma levels of immunoglobulin E (IgE), tryptases, and chymases are inflammatory markers of human diabetes. Whether they also correlate with the risk of pre-diabetes, however, remains unknown.

Methods and results. A total of 260 subjects 55–75 years of age were grouped as normal glucose tolerance (NGT), isolated impaired fasting glucose (I-IFG), isolated impaired glucose tolerance (I-IGT), and mixed IFG/IGT. There were significant differences in plasma levels of high-sensitivity C-reactive protein (hsCRP) (P < 0.001) and IgE (P = 0.003) among all subgroups of pre-diabetes, and chymase in I-IGT (P = 0.043) and mixed IFG/IGT (P = 0.037) subgroups compared with NGT group. High-sensitivity CRP was a risk factor in all subgroups of pre-diabetes; IgE was a risk factor of mixed IFG/IGT; and chymase was a risk factor of I-IGT and mixed IFG/IGT. Interactions between hsCRP and high waist circumference (WC), waist-to-hip ratio (WHR), or HOMA-β index, and interactions between IgE and high WC or tryptase levels all increased further the risk of developing I-IFG, I-IGT, or mixed IFG/IGT.

Conclusion. Plasma hsCRP, IgE, and chymase levels associate with pre-diabetes status. While hsCRP, IgE, and chymase are individual risk factors of pre-diabetes, interactions with metabolic parameters increased further the risk of pre-diabetes.     

From Pre-Diabetes to Type 2 Diabetes in Obese Youth: Pathophysiological characteristics along the spectrum of glucose dysregulation

OBJECTIVE

Impaired fasting glucose (IFG) and impaired glucose tolerance (IGT) are considered pre-diabetes states. There are limited data in pediatrics in regard to their pathophysiology. We investigated differences in insulin sensitivity and secretion among youth with IFG, IGT, and coexistent IFG/IGT compared with those with normal glucose tolerance (NGT) and type 2 diabetes.

RESEARCH DESIGN AND METHODS

A total of 24 obese adolescents with NGT, 13 with IFG, 29 with IGT, 11 with combined IFG/IGT, and 30 with type 2 diabetes underwent evaluation of hepatic glucose production ([6,6-²H₂]glucose), insulin-stimulated glucose disposal (R_d, euglycemic clamp), first- and second-phase insulin secretion (hyperglycemic clamp), body composition (dual-energy X-ray absorptiometry), abdominal adiposity (computed tomography), and substrate oxidation (indirect calorimetry).

RESULTS

Adolescents with NGT, pre-diabetes, and type 2 diabetes had similar body composition and abdominal fat distribution. R_d was lower (P = 0.009) in adolescents with type 2 diabetes than in those with NGT. Compared with adolescents with NGT, first-phase insulin was lower in those with IFG, IGT, and IFG/IGT with further deterioration in those with type 2 diabetes (P < 0.001), and β-cell function relative to insulin sensitivity (glucose disposition index [GDI]) was also lower in those with IFG, IGT, and IFG/IGT (40, 47, and 47%, respectively), with a further decrease (80%) in those with type 2 diabetes (P < 0.001). GDI was the major determinant of fasting and 2-h glucose levels.

CONCLUSIONS

Obese adolescents who show signs of glucose dysregulation, including abnormal fasting glucose, glucose intolerance or both, are more likely to have impaired insulin secretion rather than reduced insulin sensitivity. Given the impairment in insulin secretion, they are at high risk for progression to type 2 diabetes. Further deterioration in insulin sensitivity or secretion may enhance the risk for this progression.Pre-diabetes, defined as the presence of elevated fasting glucose, abnormal glucose tolerance, or both, is associated with an enhanced risk for development of type 2 diabetes in adults (1), but there are limited data to define the significance in children. A recent change in the definition of the abnormal fasting glucose to a lower level (100–125 mg/dl) has increased the prevalence of pre-diabetes in both adults and youth (2–4). It is unclear from the literature what role a defect in insulin secretion or an abnormality of insulin sensitivity might play in the impairment of glucose regulation, leading to glucose intolerance or elevated fasting plasma glucose.Epidemiological studies suggest that subjects with impaired fasting glucose (IFG) have lower insulin sensitivity and higher insulin secretion (5,6) based largely on fasting indexes of insulin sensitivity and an oral glucose tolerance (OGTT)–derived single index of insulin secretion (5). Adult studies reveal similar or lower insulin sensitivity in subjects with impaired glucose tolerance (IGT) compared with those with IFG who have lower insulin secretion (7,8). These studies are contrasted with clamp studies in Pima Indians showing similar insulin sensitivity in subjects with IFG and IGT but lower insulin secretion in those with fasting dysglycemia (9).Pediatric data are limited. In overweight Latino children with a family history of type 2 diabetes (10), children with impaired versus normal fasting glucose had no significant differences in insulin sensitivity or acute insulin response. However, the glucose disposition index (GDI), or insulin secretion relative to insulin sensitivity, was significantly reduced (15% lower) in children with IFG. A more recent study in obese adolescents revealed that subjects with IFG had decreased glucose sensitivity of first-phase insulin secretion and liver insulin sensitivity, whereas those with IGT had more severe degrees of peripheral insulin resistance compared with subjects with normal glucose tolerance (NGT) (11). We recently demonstrated that insulin secretion relative to insulin sensitivity shows a significantly declining pattern: highest in youth with NGT, intermediate in youth with IGT, and lowest in youth with type 2 diabetes (12).In an attempt to clarify the controversy concerning the metabolic derangements in the different categories of the pre-diabetes state, the aims of the present study were to 1) to investigate the metabolic characteristics of insulin sensitivity and secretion in obese youth, with IFG versus IGT, of similar body composition and abdominal adiposity and 2) to compare them not only with those with NGT but also with children with type 2 diabetes.     

糖尿病前期合并高血压患者早期肾损伤的敏感检测指标

目的检测糖尿病前期合并高血压患者早期肾损伤的敏感检测指标。方法选取健康对照(NGT)组、高血压合并糖耐量减低(IGT)组、高血压合并空腹血糖受损且糖耐量减低(IFG/IGT)组,每组各检测100例。测定各受试者尿液N-乙酰-β-D-氨基葡萄糖苷酶(NAG)、β-D半乳糖苷酶(GAL)活性,测定尿β2-微球蛋白(β2-MG)、尿半胱氨酸蛋白酶抑制剂C(Cystatin C)、尿微量清蛋白(mALB)浓度、血清尿素氮、肌酐浓度,并镜检尿红细胞数量。结果高血压合并IGT组、高血压合并IFG/IGT组的尿NAG、GAL活性、尿β2-MG浓度、尿Cystatin C浓度均高于NGT组(P值均小于0.05)。并比较IGT组、IFG/IGT组的阳性(异常例数)检出率,发现尿NAG、GAL、β2-MG、尿Cystatin C的阳性检出率均显著大于尿微量清蛋白、尿红细胞、血清尿素氮、肌酐的阳性检出率(P值均小于0.05)。结论联合检测尿NAG、GAL、β2-MG、Cystatin C是发现糖尿病前期合并高血压患者早期肾损伤的敏感检测指标。     

The relationship between endothelial dysfunction and oxidative stress in diabetes and prediabetes

Objective: Diabetes mellitus is associated with endothelial dysfunction and oxidative stress (OS). The aim of the present study was to determine whether increased OS and impaired endothelial function, are present in early states of diabetes, such as impaired glucose tolerance (IGT) and impaired fasting glucose (IFG). Methods: Brachial artery flow‐mediated dilatation (FMD) and nitrate‐induced dilatation were measured in 133 subjects with carbohydrate abnormalities (45 IGT, 44 IFG and 44 Type 2 diabetes mellitus) and in 46 subjects with normal glucose tolerance (NGT). Waist circumference, body mass index, blood pressure and fasting lipid profiles were obtained, and glucose and insulin values in response to a 75‐g oral glucose load were also measured. Plasma malondialdehyde (MDA) and superoxide dismutase (SOD) activity were determined. Results: Patients with diabetes and prediabetes had a higher plasma MDA concentration, but a lower plasma SOD activity than the NGT group (p = 0.006) and SOD activity was positively associated with FMD (p = 0.039). FMD were significantly reduced in the groups of subjects with abnormal carbohydrate metabolism compared with the NGT group (p = 0.035). Among the subjects with diabetes and prediabetes, FMD showed a negative correlation with fasting glucose and/or plasma glucose level at 120 min after oral glucose tolerance test (p = 0.028). Conclusions: The results showed that endothelial dysfunction and increased OS were present in subjects with IGT and IFG, indicating endothelial damage in these stages.     

糖耐量减低者体内氧化应激水平升高

目的 探讨糖耐量减低患者体内氧化应激状况.方法 选取糖耐量减低（IGT）组45例和糖耐量正常（NGT）组51例,测定其血清超氧化物歧化酶（SOD）、谷胱甘肽过氧化物酶（GSH）、活性氧（ROS）和丙二醛（MDA）水平.比较IGT组与NGT组的氧化应激状况,并对氧化应激指标进行相关性分析.结果 与NGT组相比,IGT组血清SOD和GSH水平明显下降,而血清ROS和MDA水平明显升高（P＜0.05）;而且经校正性别和年龄后,两组问的差异仍具有统计学意义（P＜0.05）.Spearman相关分析显示,GSH与年龄、BMI、FBG以及TG呈负相关;SOD与年龄、FBG、HOMA-IR以及TC呈负相关;ROS与年龄、BMI、FBG、HOMA-IR以及TG呈正相关;MDA与HOMA-IR和TG呈正相关.结论 此研究结果提示,糖耐量减低者体内存在着高水平的氧化应激状态,但仍有待于更大样本的进一步研究来证实.