不同糖耐量患者糖化血红蛋白与胰岛素抵抗的相关性研究

目的 探讨不同糖耐量患者HbA1 c与IR的相关性.方法 291名受试者行75 gOGTT,根据结果分为T2DM、IGR和正常糖耐量（NGT）组,分析各组HbA1c与IR相关指标的关系.结果 T2DM组FPG、2 hPG、HbA1c、LDL-C、FIns和胰岛素抵抗指数（HOMA-IR）高于IGR组,HDL-C、胰岛素分泌指数（HOMA-β）和ISI低于IGR组（P＜0.05或P＜0.01）.T2DM组HbA1c与TG、HOMA-IR呈正相关（r=0.17,P=0.03;r=0.19,P=0.02）,与HOMA-β、ISI呈负相关（r=-0.39,P=0.00;r=-0.28,P=0.00）.IGR组HbA c与HOMA-β、ISI呈负相关（r=-0.49,P=0.00;r=-0.32,P=0.02）.NGT组HbA1c与HOMA-IR、HOMA-β、ISI无相关性（P＞0.05）.结论 T2DM组HbA1 c、HOMA-IR高于IGR组,不同糖耐量组HbA1c与IR呈正相关.     

老年糖尿病患者下肢动脉病变的筛查及其相关危险因素

目的研究踝肱动脉血压指数(ABI)在诊断老年2型糖尿病(T2DM)患者下肢动脉病变(PAD)中的临床意义及其影响因素。方法采用多普勒血流探测仪检测老年T2DM患者足背动脉、胫后动脉与肱动脉血压,并计算其比值,以0.9为PAD组,≥0.9为非PAD组,比较并分析两组代谢参数。结果 273例老年T2DM患者中PAD组89例,占总例数33%,非PAD组184例。与非PAD组比较,PAD组年龄、糖尿病病程、收缩压(SBP)、舒张压(DBP)、总胆固醇(TC)、三酰甘油(TG)、低密度脂蛋白胆固醇(LDL-C)均明显增高(P均0.01);相关分析显示,ABI与年龄、糖尿病病程、HbA1c、LDL-C呈显著负相关(分别为r=-0.346,P0.01;r=-0.202,P0.01;r=-0.252,P0.01;r=-0.279,P0.01)。结论 ABI在诊断老年T2DM下肢动脉病变中具有重要意义;年龄、病程、LDL-C、高血糖、高血压为下肢动脉病变的主要危险因素;大于65岁老年糖尿病患者PAD发生率显著增高。     

2型糖尿病患者血清抵抗素、脂联素与下肢动脉病变的关系

目的 探讨初诊2型糖尿病患者空腹血清抵抗素、脂联素水平与下肢动脉病变(PAD)的关系.方法 根据踝肱指数(ABI)将96例初诊2型糖尿病患者分为PAD组和非PAD组,另选取52例健康体检者作为正常对照组,测定患者空腹血清抵抗素、脂联素、血糖、血脂及胰岛素,测量身高、体重、血压;计算体重指数(BMI)、胰岛素抵抗指数(HOMA-IR).结果 1.与正常对照组相比,2型糖尿病患者血清抵抗素水平明显升高(P＜0.01),脂联素水平明显降低(P＜0.01).2.与非PAD组相比,PAD组患者年龄明显偏高(P＜0.01),血清总胆固醇(TC)、低密度脂蛋白(LDL)水平升高(P＜0.05)、HOMA-IR、血清抵抗素明显升高(P＜0.01),脂联素水平降低(P＜0.01).3.相关分析表明,2型糖尿病患者血清脂联素与ABI呈正相关(r=0.367,P＜0.05),血清抵抗素与ABI负相关(r=-0.421,P＜0.05).结论 2型糖尿病合并PAD患者血清抵抗素、脂联素水平明显改变且与ABI相关,抵抗素、脂联素可能在2型糖尿病下肢动脉病变的发生发展中起重要作用.     

血液及骨骼肌免疫状况对老年胰岛素抵抗及甲状腺功能的影响

目的探讨老年2型糖尿病(T2DM)患者外周血液及骨骼肌免疫状态对胰岛素抵抗(IR)及甲状腺功能的影响及相关性。方法 60例新诊断老年T2DM患者,采用稳态模型计算胰岛素抵抗指数(HOMA-IR),同时检测外周血免疫球蛋白(Ig)A、IgG、IgE、IgM、补体C3、补体C4及甲状腺功能最敏感指标促甲状腺激素(TSH)水平,观察HOMA-IR和TSH与外周血免疫水平的相关性;30例患者行三角肌活检并行免疫组化检测IgA、IgG、IgM、C1q、C3c、C4c表达情况,并根据有无免疫复合物沉积情况分组,观察骨骼肌免疫状态对HOMA-IR和TSH水平的影响。结果 HOMAIR与IgA呈正相关(r=0.336,P0.01),TSH水平与补体C4呈负相关(r=-0.364,P0.05),所有患者骨骼肌镜下病理均有肌营养不良表现,18例患者肌肉组织有免疫复合物沉积,与无免疫复合物组患者相比,其HOMA-IR升高(P0.01),而TSH水平降低(P0.05)。结论老年T2DM患者免疫状态与IR及甲状腺功能有强相关性,骨骼肌免疫表达状况对老年T2DM患者IR及甲状腺功能有重要影响,提示免疫是老年T2DM患者IR及甲状腺功能异常的原因之一。     

T2DM患者血浆内脏脂肪素、瘦素与胰岛素抵抗的相关性研究

目的 探讨2型糖尿病(T2DM)患者血浆内脏脂肪素、瘦素水平与胰岛素抵抗(IR)的相关性.方法 102例T2DM患者和64例正常糖耐量(NGT)对照者,根据BMl分为肥胖组(Ob)和非肥胖(Non-Ob)组,均测定空腹血浆内脏脂肪素、瘦素和相关临床指标,计算胰岛素抵抗指数(HOMA-IR)和腰臀比(WHR).结果 T2DM组与NGT组比较空腹血浆内脏脂肪素和瘦素水平明显升高(t=3.922,P=0.00;t=2.128,P=0.038).相关分析显示T2DM患者空腹血浆内脏脂肪紊与HOMA-IR、WHR、瘦素、HbA<,1> c和TG正相关(r=0.543,P=0.001;r=0.442,P=0.008;r=0.385,P=0.013,r=0.345,P=0.025;r=0.427,P=0.005),瘦素与HOMA-IR、性别、BMI正相关(r=0.578,P<0.01;r=0.547,P<0.01;r=0.607,P<0.01).结论 T2DM患者空腹血浆内脏脂肪素和瘦素水平显著升高,且与IR关系密切.     

多囊卵巢综合征患者血浆酰化刺激蛋白和瘦素与胰岛素抵抗的关系

目的 探讨多囊卵巢综合征(PCOS)患者血浆酰化刺激蛋白(ASP)和瘦素水平的变化及其与胰岛素抵抗(IR)的关系.方法 将39例PCOS患者分为肥胖PCOS组和非肥胖PCOS组,42名健康孕龄妇女分为单纯肥胖组和正常体重对照组.测定血浆ASP、瘦素、空腹血糖(FPG)、空腹胰岛素(Fins)水平,并计算胰岛素抵抗指数(HOMA-IR).结果 ①与正常体重对照组相比,其余三组ASP水平显著升高(P＜0.01);单纯肥胖组和肥胖PCOS组的血浆瘦素水平显著高于正常体重对照组(P＜0.05;P＜0.01),而非肥胖PCOS组与正常体重对照组无显著性差异(P＞0.05);与正常体重对照组相比,非肥胖PCOS组和肥胖PCOS组的HOMA-IR显著升高(P＜0.05;P＜0.01 ).②在PCOS患者中,ASP与Fins、HOMA-IR成正相关(r=0.284,P=0.04;r=0.297,P=0.03);瘦素与BMI、Fins、HOMA-IR成正相关(r=0.677,P＜0.01;r=0.609,P＜0.01;r=0.588,P＜0.01);ASP与瘦素不相关(r=-0.043).结论 PCOS患者存在胰岛素抵抗,其血浆ASP水平显著升高;ASP、瘦素可能与PCOS的胰岛素抵抗有关.     

糖尿病肥胖及非肥胖患者影响糖化血红蛋白的因素不同

目的 研究糖尿病肥胖及非肥胖患者糖化血红蛋白(HbA1c)与糖脂代谢指标的相关性.方法 收集121例2型糖尿病研究对象,以体质量指数(BMI)≥25 kg/m2为肥胖症标准,分为糖尿病合并肥胖症组(DM-OB)57例,糖尿病非肥胖症组(DM-NOB)64例,比较DM-OB组及DM-NOB组年龄、BMI、HbA1c、收缩压(SBP)、舒张压(DBP)、空腹血糖(FPG)、餐后2 h血糖(PPG)、餐后血糖波动(PPGE)、胰岛素抵抗指数(HOMA-IR)、三酰甘油(TG)、胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)、1/高密度脂蛋白胆固醇(1/HDL-C)、血清高敏C反应蛋白(hsCRP)差别;相关分析及多因素逐步回归分析HbA1c与以上指标的相关性.结果 DM-OB组HOMA-IR、BMI、DBP、TC、hsCRP、HbA1c、LDL-C较DM-NOB组增高.在DM-OB组,Pearson相关分析显示,HbA1c与BMI、FBG、FPG、HOMA2IR、hs-CRP正相关(P均<0.05);偏相关分析显示,控制FBG、PPG、BMI后,HbA1c仍与HOMA2IR、hs-CRP正相关(P均<0.05);多因素逐步回归分析HbA1c与FPG、HOMA2IR、hs-CRP密切相关(P均<0.01).在DM-NOB组,Pearson相关分析显示,HbA1c与PPG、PPGE呈正相关(P均<0.05);偏相关分析显示,在控制PPEG后,HbA1c仍与PPG正相关(P<0.05);多因素逐步回归分析HbA1c与PPG密切相关(P<0.01).结论 2型糖尿病,胰岛素抵抗、亚临床炎症、高空腹血糖是影响肥胖患者HbA1c水平的主要因素;餐后血糖是影响非肥胖患者HbA1c水平的主要因素,提示应当研究不同的治疗措施治疗糖尿病合并肥胖与不合并肥胖的病人.     

高同型半胱氨酸血症与老年糖尿病视网膜病变及胰岛素抵抗的关系

目的 探讨高同型半胱氨酸血症与老年糖尿病视网膜病变(DR)及胰岛素抵抗(IR)的关系.方法 ELISA法检测62例老年2型糖尿病(T2DM)患者及30例健康对照者血浆总同型半胱氨酸(Hcy)浓度:依据Hcy水平将糖尿病患者再分为高Hcy组和正常Hcy组,比较两组的临床资料.结果 高Hcy组较正常Hcy组空腹血糖(FBG)、糖化血红蛋白(HbA1c)、胰岛素抵抗指数(HOMA-IR)均明显升高(P＜0.05).多元线性逐步回归分析示:FBG、HbA1c、HOMA-IR均为有统计意义与Hcy密切相关;Logistic回归分析示,DR的发生与Hcy有关.结论 高Hcy水平是老年DR发生发展的危险因子,与IR相关.     

2型糖尿病患者血清白介素23、干扰素γ水平与胰岛素抵抗相关性

目的 探讨2型糖尿病患者白介素23(IL-23)、干扰素γ(IFN-γ)与胰岛素抵抗(IR)相关性.方法 研究对象分为正常对照组(NGT)20例、新诊2型糖尿病组(DM1)33例、既往2型糖尿病组(DM2)32例,各组根据BMI又分为正常体重亚组(NW,BMI≤25kg/m2)、肥胖亚组(OB,BMI＞25kg/m2).检测各组的体重、身高、腰围、臀围、FPG、FIns、TC、TG、HbA1c,酶免法测定IL-23、IFN-γ浓度,简易稳态模型评估胰岛素抵抗指数(HOMA-IR).结果 DM1、DM2组IL-23均较NGT组明显升高(P均＜0.05),DM1组较DM2组明显升高(P＜0.01),各组内NW和OB亚组间无统计学差异(P＞0.05);NGT、DM1、DM2三组间比较IFN-γ无统计学差异(P＞0.05).血清IL-23与HOMA-IR显著相关(r=0.412,P=0.001),与IFN-γ无相关(P＞0.05); IFN-γ与HOMA-IR显著相关(r=0.739, P=0.001).结论 2型糖尿病患者IL-23显著升高,与HOMA-IR显著相关,IFN-γ无明显升高,提示IL-23是2型糖尿病IR的重要细胞因子,IL-23不通过参与调节IFN-γ发挥作用.     

超重或肥胖的男性2型糖尿病患者性激素水平的研究

目的 观察超重或肥胖的男性2型糖尿病患者性激素水平及胰岛素抵抗、糖脂代谢的变化.方法 选择男性2型糖尿病患者112例,根据体重指数分为体重正常组(50例)和超重或肥胖组(62例).所有患者测定血糖、血脂、胰岛素及性激素水平,包括睾酮、性激素结合球蛋白(SHBG)、孕激素、催乳素、黄体生成素、卵泡刺激素、雌二醇、脱氢表雄酮,并计算得出游离睾酮、生物活性睾酮.比较两组性激素水平、糖脂代谢及胰岛素抵抗相关指标的差异.结果 与体重正常组相比,超重或肥胖组空腹血糖、HbA1c、尿酸、空腹胰岛素和餐后胰岛素水平显著升高(f=-4.58～-2.35,P均＜0.05);总睾酮、SHBG水平显著降低(t=2.17,2.06,P均＜0.05).Pearson相关性分析发现,体重指数、腰围与总睾酮(r =-0.40,-0.41,P均＜0.01)、SHBG(r =-0.33,-0.42,P均＜0.01)呈显著负相关.总胆固醇和甘油三酯与总睾酮(r =-0.28,-0.24,P均=0.01)、SHBG(r =-0.27,-0.37,P均≤0.01)呈负相关;空腹胰岛素、餐后胰岛素、稳态模型评估-胰岛素抵抗指数(HOMA-IR)与总睾酮(r=-0.30-0.21,P均=0.01)、SHBG水平(r=-0.29-0.20,P均≤0.05)呈负相关.结论 超重或肥胖的男性2型糖尿病患者常存在性腺功能减退症,并与胰岛素抵抗和脂代谢异常密切相关.     

我国中老年人群脂肪肝指数与胰岛素抵抗的相关性研究

目的 探讨我国中老年人群脂肪肝指数(FLI)与胰岛素抵抗(IR)的相关性。方法 纳入南京市鼓楼区45岁以上社区自然人群3592例，根据胰岛素抵抗指数(HOMA-IR)分为IR组1938例和无IR组1654例；根据FLI分为FLI＜30组2221例、30≤FLI＜60组911例、FLI≥60组460例，比较不同亚组的一般资料、生化指标、血糖及胰岛素相关指标。采用Spearman非参数相关性分析评估FLI与HOMA-IR及胰岛β细胞功能相关指标的相关性；采用受试者工作特征(ROC)曲线评估FLI对IR的预判能力；采用多因素logistic回归分析评估FLI与IR的关系。结果IR组男性比例、年龄、血压、血脂、肝功能、OGTT各时间点血糖和胰岛素、FLI、胰岛β细胞功能指数(HOMA-β)、早期胰岛素分泌指数(ΔI0-30/ΔG0-30)及HOMA-IR均高于无IR组，血肌酐和Matsuda ISI 均低于无IR组(P＜0.05或P＜0.001)。不同FLI亚组血压、生化指标、血糖及胰岛素相关指标比较差异均有统计学意义(P<0.001)。Spearman非参数相关分析结果显示，FLI与HONA-IR呈正相关(P＜0.001)，与Matsuda ISI呈负相关(P<0.001)。ROC曲线分析结果显示，依据FLI判断IR的ROC曲线下面积(AUC)为0.670(95%CI 0.653～0.688)。多因素logistic回归分析结果显示，FLI为IR的危险因素之一，可使IR的发生风险增加1.021倍(P<0.001)。结论 在我国中老年人群中，FLI与IR相关，FLI可作为评估IR的简单易行的指标。     

Insulin resistance and incident peripheral artery disease in the Cardiovascular Health Study

Type 2 diabetes is a risk factor for peripheral artery disease (PAD), and insulin resistance is a key feature of diabetes and pre-diabetes. No longitudinal epidemiological study has examined the relation between insulin resistance and PAD. Our study analyzed the association of quartiles of the homeostatic model of insulin resistance (HOMA-IR) and the development of PAD defined by two methods. PAD was first defined as the development of an abnormal ankle-brachial index (ABI) (dichotomous outcome) after 6 years of follow-up. PAD was alternatively defined as the development of clinical PAD (time-to-event analysis). The study samples included adults over the age of 65 years who were enrolled in the Cardiovascular Health Study, had fasting measurements of insulin and glucose, had ABI measurements, and were not receiving treatment for diabetes. Multivariable models were adjusted for potential confounders, including age, sex, field center and cohort, body mass index (BMI), smoking status, alcohol use, and exercise intensity. Additional models adjusted for potential mediators, including blood pressure, lipids, kidney function, and prevalent vascular disease. In the ABI analysis (n = 2108), multivariable adjusted models demonstrated a positive relation between HOMA-IR and incident PAD (odds ratio = 1.80 comparing the 4th versus 1st quartile of HOMA-IR, 95% confidence interval [CI] 1.20-2.71). In the clinical PAD analysis (n = 4208), we found a similar relation (hazard ratio = 2.30 comparing the 4th versus 1st quartile of HOMA-IR, 95% CI 1.15-4.58). As expected, further adjustment for potential mediators led to some attenuation of effect estimates. In conclusion, insulin resistance is associated with a higher risk of PAD in older adults.     

新型简化胰岛素抵抗评价指标对糖代谢紊乱预测价值的比较研究

目的:比较并筛选具有较高诊断效能的新型简化胰岛素抵抗评价指标。方法:于2019年10月至2020年10月在北京协和医院连续选择未患2型糖尿病或糖耐量异常的健康受试者,收集受试者基本人口学信息及临床指标,包括身高、体重、腰围、空腹血糖（FPG）、甘油三酯（TG）、高密度脂蛋白胆固醇（HDL-C）、糖化血红蛋白（HbA ...     

非酒精性脂肪性肝病胰岛素抵抗程度与全血细胞计数的相关性

目的探讨伴或不伴2型糖尿病(T2DM)的非酒精性脂肪性肝病(NAFLD)胰岛素抵抗(IR)程度与全血细胞计数各参数的相关性。方法选取糖耐量正常并除外糖尿病史的单纯NAFLD患者102例,T2DM合并NAFLD患者104例,正常对照104例为研究对象,测定空腹血糖(FPG)、空腹胰岛素(FINS)和全血细胞计数,分析胰岛素抵抗指数(HOMA-IR)与全血细胞计数各参数的相关性。结果 T2DM合并NAFLD患者IR及全血细胞计数异常程度较单纯NAFLD患者更重;相关性研究表明男性HOMA-IR与WBC、NEU、LYM、RBC、HGB、HCT呈正相关,女性HOMA-IR与WBC、NEU、LYM、MID、RBC、HGB、HCT呈正相关。结论 NAFLD时白细胞参数和红细胞参数的变化与IR密切相关,T2DM的存在加重了IR对上述血细胞参数的影响。全血细胞计数可以作为反映NAFLD患者IR程度的一种简单实用的检验指标。     

20~35岁青年肥胖男性游离睾酮指数与胰岛功能指标的关联性分析

目的分析20~35岁青年肥胖男性游离睾酮指数与胰岛功能之间的关系。方法选取2019年2月至10月于肥胖门诊就诊的82例青年肥胖男性作为研究对象,按照游离睾酮指数三分位数分为3个亚组。对研究对象进行口服葡萄糖耐量试验并测定其血糖和胰岛素水平,以稳态模型评估的胰岛素抵抗指数(HOMA-IR)、稳态模型评估的胰岛β细胞功能指数(HOMA-β)、胰岛素分泌指数及胰岛素敏感指数(Matsuda指数)作为胰岛细胞功能评价指标,分析游离睾酮指数与胰岛功能之间的关系。结果青年肥胖男性人群中,随着游离睾酮指数水平升高,总睾酮、性激素结合球蛋白、Matsuda指数水平均升高,而腰围、体重指数、餐后1 h胰岛素、餐后2 h胰岛素、HOMA-IR水平则降低(均P<0.05);游离睾酮指数与HOMA-IR呈负相关(r=-0.386,P=0.016),且经校正年龄、性别、体重指数、腰围后,相关性仍有线性趋势(P_趋势=0.034);游离睾酮指数与Matsuda指数呈正相关(r=0.280,P=0.004),但经校正上述因素后,关联性消失(P_趋势=0.623)。进一步回归分析显示,经校正后,HOMA-IR每升高1个单位,游离睾酮指数降低14.1%(OR=0.869,95%CI0.767~0.984,P=0.028)。结论游离睾酮指数是青年男性肥胖人群胰岛素抵抗状态的预测指标,但其和胰岛素敏感性之间的关联可能是由肥胖引起。     

非肥胖多囊卵巢综合征患者网膜脂肪PPARγ2 mRNA表达及与IR的关系

目的探讨过氧化物酶体增殖物激活受体γ2(PPARγ2)基因在非肥胖多囊卵巢综合征(PCOS)患者网膜脂肪组织的表达水平与胰岛素抵抗(IR)的相关性。方法选取非肥胖PCOS患者(观察组)11例和非PCOS患者18例(对照组),采用RT-PCR法检测两组网膜脂肪组织PPARγ2mRNA表达水平,测定空腹血糖、空腹胰岛素(FINS),计算稳态模型胰岛素抵抗指数(HOMA-IR)。结果观察组HOMA-IR明显高于对照组,P<0.01;余指标比较无统计学差异。相关性分析示,PPARγ2 mRNA表达水平与FINS、HOMA-IR等均无相关性。结论非肥胖P-COS患者网膜脂肪组织PPARγ2 mRNA的表达水平与IR无明显相关性。     

Insulin resistance and insulin secretion in non-diabetic acromegalic patients.

Insulin resistance (IR) can be induced by high amounts of growth hormone (GH). AIM: To set up, in acromegaly without diabetes mellitus, a correlation between the disease activity in GH-secreting adenoma (AA) - assessed by minimum GH serum level during an oral glucose tolerance test (OGTT) - and severity of insulin resistance (IR), assessed by HOMA-IR index. METHODS: 75 out of 88 consecutive patients with acromegaly hospitalized in our department were included in this study. 13 patients proved to have diabetes mellitus and were excluded. Serum glucose, GH and insulin levels were measured by immunoradiometricassay basal and at 30, 60 and 120 minutes after a 75 g OGTT in 88 patients with active or cured acromegaly. IR was assessed using HOMA-IR index (Homa-IR=basal serum glucose (mg/dl) x basal serum insulin (mU/L)/22.5 x 18). A value over 2.5 was considered indicating IR. RESULTS: Out of 75 patients without diabetes mellitus, 36 subjects (48%) were presenting with IR (34 with active disease, 2 cured). We found a significant positive correlation (r=0.56, p<0.001) between AA and HOMA-IR. The GH minimal level corresponding to the intersection of the exponential regression curve with the HOMA-IR level of 2.5 was 8.8 ng/mL, a cut-off point indicating IR with 82% specificity and 78% sensitivity. The odds ratio for developing IR becomes significant at a minimum GH level during OGTT of 2 ng/mL (odds ratio 7.6, 95% confidence interval 2-29). CONCLUSIONS: The severity of IR revealed by acromegaly correlates with GH production. A GH serum level higher than 2 ng/mL during OGTT indicates an increased risk for developing IR. This cut-off level of GH can be used as one of criteria of cured disease, regarding the lack of metabolic effects.     

Hepatitis C virus directly associates with insulin resistance independent of the visceral fat area in nonobese and nondiabetic patients

Insulin resistance (IR) is known to be associated with the visceral adipose tissue area. Elucidation of the relationship between hepatitis C virus (HCV) and IR is of great clinical relevance, because IR promotes liver fibrosis. In this study, we tested the hypothesis that HCV infection by itself may promote IR. We prospectively evaluated 47 patients with chronic HCV infection who underwent liver biopsy. Patients with obesity, type 2 diabetes mellitus (DM), or a history of alcohol consumption were excluded. IR was estimated by calculation of the modified homeostasis model of insulin resistance (HOMA-IR) index. Abdominal fat distribution was determined by computed tomography. Fasting blood glucose levels were within normal range in all the patients. The results of univariate analysis revealed a significant correlation between the quantity of HCV-RNA and the HOMA-IR (r = 0.368, P = 0.0291). While a significant correlation between the visceral adipose tissue area and the HOMA-IR was also observed in the 97 control, nondiabetic, non-HCV-infected patients (r = 0.398, P < 0.0001), no such significant correlation between the visceral adipose tissue area and the HOMA-IR (r = 0.124, P = 0.496) was observed in the patients with HCV infection. Multiple regression analysis with adjustment for age, gender and visceral adipose tissue area revealed a significant correlation between the HCV-RNA and the HOMA-IR (P = 0.0446). HCV is directly associated with IR in a dose-dependent manner, independent of the visceral adipose tissue area. This is the first report to demonstrate the direct involvement of HCV and IR in patients with chronic HCV infection.     

Insulin resistance and pancreatic β cell dysfunction are associated with thyroid hormone functions: A cross-sectional hospital-based study in Turkey

Background and aimsThe prevalence of thyroid disease in diabetic patients is significantly higher than the general population. This indicates a possible interaction between thyroid functions and insulin sensitivity. This study aimed to investigate the relationship between insulin resistance (IR), pancreatic β cell function, and thyroid function tests.MethodsThis cross-sectional study was conducted with adults who applied to Eskişehir Osmangazi University Hospital for general control. Fasting insulin, glucose, TSH, fT3, and fT4 levels in the serum of 1340 adult (18–60 aged) patients without any chronic diseases were examined retrospectively. The fT3/fT4 ratio, Homeostatic Model Assessment for Insulin Resistance (HOMA-IR), and HOMA-β values were calculated. The correlation between HOMA-IR and HOMA-β values with thyroid function tests and differences between hormone levels of patients with and without IR were evaluated.ResultsThere was a positive correlation between HOMA-IR and TSH, negative with fT4. Also, a positive correlation between HOMA-β and fT3, negative correlation with fT4 were observed. In the IR group, fT3 levels were found significantly higher and fT4 levels were significantly lower. TSH levels were higher in the IR group but not statistically significant. The fT3/fT4 ratio was found significantly higher in the IR group and was correlated positively with both HOMA-IR and HOMA-β.ConclusionOur results revealed that thyroid dysfunction prevalence is quite high in adults who have not yet been diagnosed with diabetes but have insulin resistance and the onset of pancreatic β cell dysfunction.     

Microalbuminuria in relation to the metabolic syndrome and its components in a Chinese population

Background

Although the positive relationship between insulin resistance (IR) and central obesity is well known, the direct relationship between waist circumference and IR is not clear yet and there is no consensus regarding the cut off value for waist circumference as a surrogate index for central obesity. The present study was aimed to determine the optimal cut-off value of waist circumference (WC) for predicting IR in reproductive aged Iranian women.

Methods

Using the stratified, multistage probability cluster sampling method 1036 women were randomly selected from among reproductive aged women of different geographic regions of Iran. Following implementation of exclusion criteria, complete data for 907 women remained for analysis. Insulin resistance was evaluated by the homeostasis model assessment (HOMA-IR) and its cut off value was defined as the 95th percentile of HOMA-IR value for 129 subjects, without any metabolic abnormality. The optimal cut-off of WC in relation to HOMA-IR was calculated based on the receiver operating characteristics (ROC) curve analysis using the Youden index and the area under curve (AUC).

Results

The mean age of the total sample of 907 subjects was 34.4 ± 7.6 years (range, 18 - 45 years). After adjustment for age the odds ratios (OR) of elevated HOMA-IR were progressively higher with increasing levels of waist circumference; the age adjusted OR of IR for women with WC > 95 cm in comparison to those subjects with WC < 80 cm, was 9.5 (95% CI 5.6-16.1). The optimal cutoff value for WC predicting IR was 88.5 cm; with a sensitivity and specificity of 71% and 64%, respectively.

Conclusions

Waist circumference is directly related to insulin resistance and the optimal cut-off value for waist circumference reflecting insulin resistance is considered to be 88.5 cm for reproductive aged Iranian women.