糖化血红蛋白用于筛查糖尿病的意义

目的比较并评价空腹血糖（FPG）和糖化血红蛋白（HbA1c）在筛查DM中的应用价值。方法上海地区研究对象2298名,为明确DM诊断而就诊者和DM高危人群接受DM筛查者,男956名,女1342名,年龄52±13岁,行OGTT并测定HbA1C;以其工作特征曲线（ROC）评价FPG和HbA。C在筛查DM中的敏感性和特异性。结果（1）按照1999年WHO的DM诊断标准,本研究人群糖耐量正常（NGT）、空腹血糖受损（IFG）、糖耐量受损（IGT）、IGT合并IFG和DM者分别为830、110、380、183、795例。其中DM患病率为34．6％。（2）依据ROC判断,与DM状态相关的FPG最佳临界点为6．1mmol／L,敏感性和特异性均为81．5％,曲线下面积为0．899（95％CI0．885～0．914）,阳性似然比4．18,阴性似然比0．23;与DM状态相关的HbA1c最佳临界点为6．1％,敏感性和特异性均为81．0％,曲线下面积为0．890（95％CI0．876-0．904）,阳性似然比4．26,阴性似然比0．23;如应用FPG≥6．1mmol／L或HbA1c≥6．1％筛查DM,敏感性和特异性分别为96．5％和65．2％,阳性似然比2．77,阴性似然比0．05。结论FPG和HbA1C在筛查DM中具有相似的价值,二者均有相似的特异性和敏感性以及阳性似然比和阴性似然比。为了最大限度的筛查出DM患者,建议对于6．1mmol／L≤FPG〈7．0mmol／L或HbA1c≥6．1％的患者行OGTT检查以明确有无DM。     

空腹血糖受损诊断标准下调的合理性分析

目的　探讨空腹血糖受损 (IFG)诊断点从 6.1mmol/L下调至 5 .6mmol/L的合理性。方法对1986年入选的 468名非糖尿病人群〔3 41例正常糖耐量 (NGT) ,12 7例糖耐量受损 (IGT)〕在 1988年 ,1990年和 1992年分别进行OGTT复查 ,测定空腹血糖 (FPG)及 2h血糖 (2hPG)。以COX模型分析不同基线血糖水平增加糖尿病的风险。结果　 (1) 10 9例 6年后发生糖尿病。COX成比例风险模型分析校正年龄、性别、体重指数 (BMI)影响后发现FPG与 2型糖尿病发病显著相关 (P =0 .0 0 0 1)。基线FPG 5 .6～ 6.0mmol/L组糖尿病发病危险性比FPG <5 .6mmol/L组已显著增加 ,RR为 3 .3 (95 %CI 2 .0～ 5 .3 ,P =0 .0 0 0 1)。 (2 )受试者工作特征 (ROC)曲线分析FPG预测糖尿病发病的最佳阈值是 5 .6mmol/L ,以FPG 5 .6mmol/L为诊断点IFG预报糖尿病发病的灵敏度、特异度、阳性预测值分别为 45 .0 % ,92 .8%和 65 .3 %。 (3 )NGT个体中COX成比例风险模型校正年龄、性别、BMI后显示 ,FPG分组 (5 .0～ 6.0mmol/L与 <5 .0mmol/L)与糖调节受损 (IGR ,包括IFG或IGT)发生显著正相关 (P =0 .0 0 7)。ROC曲线显示 ,FPG预测糖耐量恶化而进展为DM或IGR的最佳阈值为 5 .3mmol/L。结论　 (1)本组非糖尿病人群中FPG预测糖尿病发病的最佳阈值为 5 .6mmol/L     

Prevalence of glucose intolerance in primary hyperparathyroidism and the benefit of parathyroidectomy

BACKGROUND: Increased prevalence of diabetes mellitus (DM) in primary hyperparathyroidism (PHPT) is established, but not glucose intolerance (GI), nor benefit from parathyroidectomy on GI. We determined these during management of a continuous series of patients with PHPT routinely followed after surgery. PATIENTS AND METHODS: WHO criteria classified 75 g oral glucose tolerance tests (OGTT) in 51/54 consecutively proven PHPT patients, into normal glucose tolerance (NGT), DM, impaired glucose tolerance (IGT) or impaired fasting glucose (IFG); GI was derived by adding those with DM and IGT/IFG. OGTT were repeated after parathyroidectomy (mean follow up 2.4 +/- SD 1.6 years). Paired student t tests were used to compare fasting and 2-h plasma glucose (PG). RESULTS: At presentation 32/54 patients (59%) had NGT, 10 IGT/IFG (19%) and 12 type 2 DM (22%), nine newly diagnosed. Before parathyroidectomy 17/35 patients had NGT (49%), 18 GI (51%), 12 DM (34%) and 6 IGT/IFG (17%). Five out of six patients with IGT/IFG had NGT, one with NGT developed IGT. At completion 23 patients (66%) had NGT, 12 GI (34%), 4 IGT/IFG (11%) and 8 DM (23%). After parathyroidectomy fasting and 2-h. PG fell in 30/34 normocalcaemic patients not on hypoglycaemic agents, 5.6 +/- 1.0 to 5.4 +/- 0.8 mmol/l, 7.2 +/- 3.0 to 6.3 +/- 3.1 mmol/l (p < 0.05, p < 0.01). CONCLUSIONS: 1.At presentation with PHPT, OGTT commonly identifies Type 2 DM and GI.2.After successful parathyroidectomy fasting and 2-h. PG fall significantly (p < 0.05, p < 0.01). DM and IGT/IFG often ameliorates to IGT or NGT, persistently.     

糖化血红蛋白与糖调节受损血糖水平相关性的研究

目的 探讨研究糖化血红蛋白(HbAlc)与糖调节受损血糖水平的相关性.方法 2009年2-3月在兰州大学附属白银医院在岗职工中开展口服75 g葡萄糖耐量试验(OGTT)和HbAlc普查,测定空腹血糖、服糖后2 h血糖及HbAlc,采用葡萄糖氧化酶法测定静脉血浆血糖,采用高效液相色谱分析法测定HbAlc.研究资料纳入标准:空腹血糖<7.0 mmol/L且服糖后2 h血糖<11.1mmol/L者,无糖尿病、血红蛋白病、肝、肾疾患等.进入结果分析的对象共726例,男197例,女529例,平均年龄(39±10)岁.其中正常糖耐量636例(87.6%),糖调节受损90例(12.4%),糖调节受损诊断采用1999年世界卫生组织糖尿病诊断标准.率间比较采用χ~2检验,双变量分析采用Pearson相关分析.结果 (1)糖调节受损占HbAlc≤5.7%人群的2.3%,占HbAlc≥5.8%的人群中89.3%.HbAlc≥5.8%时预测OGTT诊断的糖调节受损状态的敏感度、特异度、阳性预测值、阴性预测值分别为83%、99%、0.89和0.98;(2)OGTT诊断的空腹血糖受损、糖耐量减低及糖调节受损状态的患病率,在HbAlc为5.8%组与5.7%组比较差异具有统计学意义(χ~2值分别为10.077、22.219和27.780,P<0.01或P<0.001);(3)HbAlc水平与空腹血糖受损、糖耐量减低、糖调节受损的患病率之间呈显著性正相关(r值分别为0.957、0.928和0.936,均P<0.01).结论 (1)HbAlc预测糖调节受损与OGTT具有一致性,与OGTT诊断的糖调节受损状态相关的HbAlc最佳临界值为5.8%;(2)HbAlc与OGTT诊断空腹血糖受损、糖耐量减低、糖调节受损状态的血糖水平呈显著性正相关,且HbAlc为5.8%与其相关性极其密切.建议当HbAlc≥5.8%时均应行OGTY检查,以明确有无糖调节受损.     

Impaired fasting glucose and risk of diabetes in Taiwan: follow-up over 3 years

The purpose of this paper was to examine the relationship between fasting glucose levels and development of diabetes among residents of Penghu, Taiwan. From July 1995 to June 1996, a population-based cohort study was conducted among residents aged ≥40 years on the island of Penghu, Taiwan. Of the 1601 surveyed, 1306 (81.6%) did not have diabetes. Six hundred of these 1306 persons were re-examined 3 years later. Participants with fasting plasma glucose (FPG) concentration <110 mg/dl (<6.1 mmol/l) were classified as normoglycemic, those with a glucose concentration of 110–126 mg/dl (6.1–7.0 mmol/l) had impaired fasting glucose (IFG), and those with a fasting glucose concentration of ≥126 mg/dl (7.0 mmol/l) were considered to have diabetes. During the 3-year follow-up, 4.3% of the total population (1.4% per year, 95% CI 0.9–1.9%) developed diabetes. Of those with IFG at baseline, 9.6% (3.2% per year, 95% CI 1.8–5.0%) progressed to diabetes, but only 2.5% (0.8% per year, 95% CI 0.4–1.2%) of normoglycemic people did so. The multivariate-adjusted odds ratio of developing diabetes was 4.4 (95% CI 1.9–10.6) for persons with IFG compared with those who were normoglycemic at baseline. Other significant predictors of progression to diabetes were higher waist–hip ratio (WHR), triglyceride and apolipoprotein B (apo B) levels. In this Asian Chinese population, IFG is a strong predictor of diabetes. The high rate of conversion from IFG to diabetes, combined with the previously observed high IFG prevalence, suggests future high prevalence rates of diabetes in Taiwan.     

Hyperglycaemia and mortality from all causes and from cardiovascular disease in five populations of Asian origin

Aims/hypothesis The study was done to assess how well fasting and 2-h plasma glucose (FPG, 2-h PG) after a 75-g OGTT predict cardiovascular disease (CVD) and all-cause mortality in Asian subjects.Methods People (n=6817) of Japanese and Asian Indian origin from five prospective studies in five countries were monitored for 5 to 10 years. Hazard ratios for death from all causes and CVD were estimated using Cox proportional hazard models, adjusting for FPG, 2-h PG and established risk factors.Results Multivariate Cox regression analysis showed that an increase in FPG from 7.0 to 8.0 mmol/l (increase of 0.76 SD) increased relative risk (95% CI) by 1.14 (1.05–1.25) for all-cause and 1.24 (1.10–1.39) for CVD mortality. An increase in 2-h PG from 9.0 to 11.9 mmol/l (0.76 SD) increased relative risks by 1.29 (1.18–1.41) and 1.35 (1.19–1.54). Inclusion of 2-h PG in the FPG model improved the predictive value (p<0.001), whereas FPG did not influence the predictive value of 2-h PG (p>10). In a model containing FPG and 2-h PG, hazards ratios for 2-h PG in subjects with IGT or diabetes were 1.35 (1.03–1.77) or 3.03 (2.18–4.21) for all-cause and 1.27 (0.86–1.88) or 3.39 (2.14–5.37) for CVD mortality, compared with normal subjects. The respective hazards ratio for FPG in subjects with IFG or diabetes were 0.94 (0.68–1.31) or 0.88 (0.59–1.32) for all-cause and 1.05 (0.67–1.65) or 0.88 (0.51–1.51) for CVD mortality, compared with normal subjects.Conclusions/interpretation For prediction of premature death, 2-h PG was superior to FPG in several Asian populations.Abbreviations CVD Cardiovascular disease - DECODE Diabetes Epidemiology: Collaborative Analysis Of Diagnostic Criteria in Europe - FPG fasting plasma glucose - 2-h PG 2-hour plasma glucose - DECODA Diabetes Epidemiology: Collaborative Analysis of Diagnostic Criteria in Asia - WHO World Health Organization - IGR impaired glucose regulationThis article was written on behalf of the International Diabetes Epidemiology GroupMembers of the DECODA Study Group are listed at the end of the paper     

The prevalence of hypertension and diabetes defined by fasting and 2-h plasma glucose criteria in urban Nepal.

AIMS: To determine the prevalence of diabetes, impaired fasting glucose and impaired glucose tolerance (IGT) in people aged >/= 40 years in urban communities of Nepal, comparing the fasting and 2-h plasma glucose (PG) criteria for diagnosis of diabetes and to relate the prevalence to age, gender and hypertension. METHODS: Field surveys of fasting and 2-h PG and blood pressure (BP) were done by cluster sampling in seven urban populations of Nepal. Of 1180 eligible individuals invited, 1012 (85.7%) aged >/= 40 years participated. RESULT: The age and sex standardized prevalence of diabetes (known and newly diagnosed), IGT and impaired fasting glycaemia (IFG) were 19.0%, 10.6% and 9.9%, respectively. Of the total population, 30.5% (37.8% of men and 25.3% of women) had some abnormality of glucose tolerance. Of all diabetic individuals, 54.4% (53.8% of men and 55.1% of women) were undiagnosed. The prevalence of diabetes increased with age until the age of 75 years. The prevalence of diabetes was higher in men than in women (P < 0.001). The sensitivity of the fasting plasma glucose (FPG) criterion compared with either FPG or 2-h PG or both criteria for the diagnosis of diabetes was 70.5%[95% confidence interval (CI) 60.7, 78.8] and the corresponding sensitivity of 2-h PG criterion was 79% (95% CI 69.8, 86.1). The age- and sex-standardized prevalence of hypertension (BP >/= 140/90 mmHg) was 22.7%. Hypertension was less common in subjects with normal plasma glucose than in those with diabetes (18.8% vs. 36.7%). Similarly, of all subjects with hypertension, 29.1% had diabetes (known or newly diagnosed) and 43.0% had glucose intolerance of some form. CONCLUSIONS: Our study shows that diabetes and hypertension are common and related problems in people aged >/= 40 years in urban Nepal. The overall sensitivity of the 2-h PG criteria was greater than that of the FPG criteria for diagnosing diabetes, except in subjects aged >/= 60 years.     

下调空腹血糖切点对诊断空腹血糖受损合理性的评估

广东省佛山市2512名20-94岁职工进行75gOGTT筛查研究显示，空腹血糖（FPG）5．51mmol／L是预测糖尿病的最佳切点，其敏感性和特异性均为80％。FPG5．15mmol／L是预测糖耐量减低（IGT）的最佳切点。因此，降低空腹血糖受损（IFG）的切点是合理的、有临床意义的。     

Diagnostic criteria for diabetes mellitus and other categories of glucose intolerance: 1997 criteria by the Expert Committee on the Diagnosis and Classification of Diabetes Mellitus (ADA), 1998 WHO consultation criteria, and 1985 WHO criteria. World Health Organization.

To compare 1997 ADA diagnostic criteria for diabetes mellitus and other categories of glucose intolerance/1998 WHO Consultation criteria versus 1985 WHO criteria, we analyzed data from a 75-g oral glucose tolerance test (OGTT) performed on 1051 high-risk subjects without medical history of diabetes at Diabetes Screening Clinic, Ramathibodi Hospital, Thailand. There were 372 males and 679 females, aged (mean +/- S.D.) = 50.3 +/- 12.55 years, BMI = 25.62 +/- 4.39 kg/m2. If fasting plasma glucose (FPG) was used as recently recommended then 54.1, 20.4, and 25.5% of cases were classified as normal, impaired fasting glucose (IFG), and diabetic, respectively. In diagnosing diabetes using a full OGTT based on the 1985 WHO criteria as the reference test, FPG > or = 7 mmol/l had a sensitivity of 57.7%, specificity of 97.4%, positive predictive value of 94.0%, and negative predictive value of 76.4%; 53.7% of subjects with IFG had 2-h plasma glucose > or = 11.1 mmol/l. The 1997 ADA/1998 WHO Consultation criteria and 1985 WHO criteria for a full OGTT yield similar overall results. FPG ( > or = 7 mmol/l) was not sensitive for diagnosing diabetes. Moreover, about half of the subjects with IFG were actually diabetic. Therefore, OGTT remains a valuable test in diagnosing diabetes and classifying various categories of glucose intolerance.     

空腹血糖受损切点变化与糖尿病及心脑血管事件风险的关系--上海华阳社区40岁以上人群的随访研究

目的　比较 1999年世界卫生组织 (WHO)及 2 0 0 3年美国糖尿病协会 (ADA)标准诊断的空腹血糖受损 (IFG)与糖尿病和心脑血管事件发生风险的关系 ,从而探讨中国人IFG切点下调的合理性。方法　对 1999年上海华阳社区 40岁以上代谢综合征及其相关疾病 (糖尿病、高血压、肥胖、血脂紊乱 )的横断面调查人群在 2 0 0 2～ 2 0 0 4年进行随访。随访对象接受了 75g葡萄糖耐量试验 ,并检测血糖、血脂、胰岛素、血压、体重指数、腰围与腰臀比等。调查了心脑血管事件发生情况。结果　 (1)基线资料中无糖尿病人群共170 4例 ,完成随访 12 92例。 3年糖尿病累积发生率为 4.64 % ,年发病率 1.5 5 %。 (2 )正常糖调节及糖调节受损人群的糖尿病年发病率分别为 0 .97%及 6.97%。 (3 )随访空腹血糖 (FPG) 5 .6～ 6.0mmol/L、6.1～ 6.9mmol/L而餐后 2h血糖 (2hPG) <7.8mmol/L的人群见到发生糖尿病的风险分别增加 3 .71及 2 8.12倍 (P <0 .0 0 1) ,但未见到发生心脑血管事件的风险显著增加。 (4 )在FPG <5 .6mmol/L且 2hPG 7.8～ 11.0mmol/L人群中 ,发生糖尿病及心脑血管事件的相对风险分别显著增加 4.3 1及 3 .40倍 (P <0 .0 0 1)。结论　FPG 5 .6～ 6.0mmol/L的人群发生糖尿病的风险显著增加 ,将空腹血糖受损的下限调整至 5 .     

Prediction of diabetes using ADA or WHO criteria in post-menopausal women: a 10-year follow-up study

Aims/hypothesis. To study the risk of women with impaired fasting glucose (IFG) as against impaired glucose tolerance (IGT) developing diabetes.¶Methods. Oral glucose tolerance tests (75 g) were done in 265 women selected at random at baseline (age 55–57 years) and at a 10-year follow-up. Of the women 42 had IFG/NGT (fasting glucose 6.1–6.9 mmol/l, 2-h glucose < 7.8 mmol/l), 66 IGT/NFG (2-h glucose 7.8–11.0 mmol/l, fasting glucose < 6.1 mmol/l), 30 IGT/IFG and 127 NFG/NGT.¶Results. The 10-year progression to diabetes was similar in IGT/NFG (12.1 %) and IFG/NGT groups (11.9 %, p = 0.97). In IGT/IFG, 20.0 % had developed diabetes, which was not significantly higher than in IFG/NGT and IGT/NFG (p = 0.53). In NFG/NGT at baseline, only 3.9 % had developed diabetes, which was lower than in the other groups (p = 0.023).¶Conclusion/interpretation. Fasting and 2-h glucose concentrations are equally good in predicting diabetes development over a 10-year period in Caucasian postmenopausal women. Because IGT is more common than IFG, measuring only fasting glucose concentrations would, however, result in missing a prediabetic stage in a large group of people at risk for diabetes and cardiovascular diseases. [Diabetologia (2000) 43: 1224–1228]     

Fasting plasma glucose and glycated haemoglobin in the screening of diabetes and impaired glucose tolerance

Abstract. The use of fasting plasma glucose (FPG) only has been proposed for the screening and diagnosis of diabetes, but its sensitivity has been reported to be unsatisfactory. The use of HbA_1C, alone or combined with FPG, has been suggested for the screening of diabetes and impaired glucose tolerance (IGT). In a sample of 1215 adult subjects without previously known diabetes, we assessed the sensitivity and specificity of FPG and HbA_1C in diagnosing diabetes and IGT, determined by oral glucose tolerance test (OGTT). All lean diabetic patients, and 85% of overweight and obese diabetic individuals, had FPG 7 mmol/l. FPG >6.1 mmol/l had a sensitivity of 98.8% and a specificity of 32.9%; HbA_1C had a lower specificity and sensitivity for the screening of diabetes. A screening strategy for diabetes based on FPG, with OGTT in all overweight subjects with FPG >6.1 mmol/l, is suggested. Neither FPG nor HbA_1C is effective in the screening of IGT; although combined FPG and HbA_1C could be useful for case finding, screening for IGT with OGTT is advisable in all subjects at high risk.     

Screening for diabetes mellitus--a two-step approach in individuals with impaired fasting glucose improves detection of those at risk of complications.

AIMS: To compare the new American Diabetes Association (ADA) fasting plasma glucose (FPG) criteria to the 1985 World Health Organization (WHO) 2-h post glucose (2hPG) criteria when used for screening of those with no prior history of diabetes mellitus. METHODS: The study included 3,407 subjects without a history of diabetes in whom both FPG and 2hPG were available from the 1992 Singapore National Health Survey. The agreement (kappa) between FPG and 2hPG for the diagnosis of DM was assessed. The optimal cut-off of FPG for the detection of individuals with 2hPG > or = 11.1 mmol/l was determined by receiver-operating characteristics analysis. RESULTS: The prevalence of diabetes diagnosed by FPG alone was 7.3% compared to 8.4% diagnosed by 2hPG. The prevalence of impaired fasting glucose was 8.0%. FPG and 2hPG showed moderate agreement (kappa = 0.646, 95% confidence interval 0.584-0.708). Age, ethnic group and obesity did not affect the degree of agreement. Of those with 2hPG > or = 11.1 mmol/l, 40.8% had FPG in the non-diabetic range while 24.8% of those with FG > or = 7.0 mmol/l had 2hPG in the non-diabetic range. The optimal FPG for the detection of 2hPG > or =11.1 mmol/l was 6.1 mmol/l. Oral glucose tolerance tests (OGTT) in those with 6.0 mmol/ < FPG < 7.0 mmol/l resulted in the diagnosis of diabetes in 90.7% of individuals at risk of microvascular complications. CONCLUSIONS: FPG provides a simple screening test for diabetes, which shows moderate agreement with the 2hPG. A two-step strategy of OGTT in those with impaired fasting glucose improves the detection of at-risk individuals. However, diabetes should not be diagnosed on a single test. The test should be repeated on another day if an individual tests positive for diabetes.     

Diabetes screening after gestational diabetes mellitus: poor performance of fasting plasma glucose

Abstract. Gestational diabetes mellitus (GDM) is an established risk factor for the development of overt diabetes. Since the change in diagnostic criteria for diabetes in 1997, it is unclear whether there should be any preference for fasting or post-glucose challenge blood glucose in diagnosing diabetes after GDM. The study aimed at assessing the usefulness of both diagnostic methods in women after GDM. The study enrolled 193 women with previous GDM. Women who did not have a current diagnosis of diabetes were screened for impaired fasting glucose (IFG) and for glucose intolerance with an oral 75-g glucose tolerance test. A total of 45 (23.3%) subjects declared to be already diabetic. Of the 148 non-diabetic subjects, 141 (95.3%) had normal fasting plasma glucose, whereas four (2.8%) had IFG (i.e. FPG6.1 and <7.0 mmol/l) and 3 (2.5%) had FPG7.0 mmol/l. Upon OGTT, among the 141 subjects with normal FPG, 6 (4.3%) were diagnosed with diabetes and 23 (16.3%) with impaired glucose tolerance (IGT); the remaining 112 (79.5%) had normal glucose tolerance. Three out of four subjects with IFG had IGT. The sensitivities of fasting criteria for diagnosis of diabetes and IFG/IGT were 14.3% (95% CI, 8.0%–37.2%) and 17.1% (95% CI, 8.6%–19.8%), respectively. The specificities were 98.6% (95% CI, 97.9%–99.7%) and 99.1% (95% CI, 96.5%–100%), respectively. The kappa for diabetes diagnosis was 0.177 (95% CI, 0.018–0.507). For women with previous GDM, the sensitivity of the new criteria based upon fasting plasma glucose is unacceptably low. In addition, the two sets of criteria are not interchangeable. Therefore, we suggest full glucose tolerance diagnostic procedures in women after GDM, including assessment of post-glucose challenge values.     

Creating a pandemic of prediabetes: the proposed new diagnostic criteria for impaired fasting glycaemia

Aims/hypothesis In November 2003 the American Diabetes Association expert committee on the diagnosis and classification of diabetes mellitus suggested a revision of the diagnostic criteria for IFG, lowering the diagnostic threshold from 6.1 to 5.6 mmol/l. The aim of the present study was to evaluate the consequences of this change with respect to: (i) the prevalence of IFG in five different countries; (ii) the concordance between IFG and IGT (classification of individuals); and (iii) the cardiovascular risk profile of these groups. Finally we discuss the likelihood that intervention for cardiovascular risk and prevention strategies developed for individuals with IGT are applicable to subjects with IFG.Methods The first part of the study is based on the population-based Danish Inter99 study, where 6265 individuals, aged 30 to 60 years and without previously diagnosed diabetes, underwent an oral glucose tolerance test. The second part is based on the DETECT-2 project, in which studies from China, India, France and USA were used to analyse the impact of the proposed revision of the diagnostic criteria in different ethnic groups.Results The proposed change in diagnostic criteria would increase the prevalence of IFG in Denmark from 11.8 to 37.6%. The proposed IFG category would identify 60.0% of all subjects with IGT compared to 29.2% with the old criteria, but among individuals with the new IFG category only 18.5% would also have IGT. Individuals with isolated IFG had lower insulin levels and a lower cardiovascular risk profile with the proposed criteria compared with the current WHO criteria. Data from the DETECT-2 study confirmed the marked increase in the prevalence of IFG, and the estimated number of individuals in the age range 40 to 64 years with IFG in urban India, urban China and the USA would increase by 78%, 135% and 193% respectively.Conclusions/interpretation The proposed revised diagnostic criteria will lead to a dramatic increase in the prevalence of IFG, but the concordance rate between IFG and IGT remains low. This new IFG group will have a more favourable cardiovascular risk profile than the current IFG group as defined by the WHO. This seriously questions whether the existing intervention strategies are applicable to the new category of individuals with IFG.Abbreviations ADA American Diabetes Association - FPG fasting plasma glucose - NHANES III Third National Health and Nutrition Survey - WHO World Health Organization     

Undiagnosed diabetes and impaired glucose regulation in adult Ghanaians using the ADA and WHO diagnostic criteria

Fasting glucose and oral glucose tolerance test (OGTT) criteria for glucose homeostasis were compared in a cross-sectional cluster, community study in Accra, Ghana. A total of 4636 subjects without prior diagnosis of diabetes had fasting plasma glucose, 2-hour OGTT and measurement of cardiovascular risk factors. Mean age of subjects was 44.2 years; 39.1% of subjects were males. The overall prevalence of undiagnosed diabetes ascertained with both criteria was 4.5% (n=209). The prevalence of undiagnosed diabetes by fasting (3,2%) and OGTT (3.1%) criteria were similar (p>0.05). The prevalence of impaired glucose tolerance (IGT) (15.8%) was higher than that of impaired fasting glucose (IFG) (10.7%). Only 56.5% (n=83) of subjects with diabetes by fasting criteria also had diabetes by OGTT criteria. Sixty-two subjects (42.8%) with diabetes by OGTT had normal or impaired fasting glucose. There was poor agreement between the two diagnostic criteria (kappa=0.31). The concordant normoglycaemic group was the youngest and had the lowest body-mass indey (BMI), waist girth, waist-hip ratio (WHR), total cholesterol, and systolic and diastolic blood pressures. The concordant diabetic group, in contrast, had the highest BMI, waist girth, WHR, total cholesterol and triglyceride levels. Both systems gave similar undiagnosed diabetes rates bur dissimilar IFG and IGT rates. There was poor agreement between the two diagnostic criteria. Diagnostic criteria influenced cardiovascular risk factors. A case may be made for using both criteria in order to ascertain all “diabetes” and all “at-risk” subjects. Received: 4 January 2001 / Accepted in revised form: 18 January 2002     

从胰岛素敏感性和胰岛β细胞功能看空腹血糖受损切点下调

目的评估空腹血糖正常（NFG）人群胰岛素敏感性（IS）和胰岛β细胞功能的特点。方法2388例受试者按OGTT结果分为低-空腹血糖正常（Low-NFG）组（FPG〈4.9mmol/L），中-空腹血糖正常（Mid-NFG）组（FPG4.9～5.6mmol/L），高-空腹血糖正常（High-NFG）组（FPG5.6～6.1mmol/L），IFG组，T2DM组。利用OGTT推导出几个指数比较各组IS和胰岛素分泌差别。结果从Low-NFG到T2DM组，β细胞分泌功能和胰岛素敏感性指数进行性下降。与Mid-NFG组比较，High-NFG组胰岛素抵抗更加明显，胰岛素分泌下降，TG升高和HDL-C降低（P〈0.01）。结论FPG5.6～6.1mmol/L时存在高胰岛素抵抗和低胰岛β细胞功能，是T2DM的高危因素。     

不同空腹血糖受损下限切点对重庆地区人群代谢状态的影响

目的寻找预测2型糖尿病（T2DM）和糖耐量减低（IGT）发生的最佳空腹血糖受损（IFG）下限切点及其对代谢状态的影响。方法采用横断面调查的方法对重庆局部地区3189例既往无糖尿病史的自然人群的空腹血糖（FPG）进行ROC分析，绘制ROC曲线，并进行糖脂代谢调查和分析。结果预测T2DM和IGT发生的最佳IFG下限切点ROC曲线下面积分别为0．899和0．728。用FPG来预测T2DM和IGT，其灵敏度及特异度均较好的点分别为5．6mmol／L和5．2mmol／L。在负荷后2h血糖（2hPG）〈7．8mmol／L人群中，与FPG〈5．6mmol／L亚组比较，FPG5．6～6．1mmol／L亚组肥胖、高血压、代谢综合征和胰岛素抵抗的发生率分别增加了53％、54％、60％和126％。IFG下限切点下调前后，糖调节受损（IGR）各亚组组分的代谢特征不改变。结论将5．6mmol／L作为IFG的下限值适用于中国人群。     

青少年人群诊断糖尿病前期不宜采用糖化血红蛋白标准

目的 探索2010年美国糖尿病协会(ADA)推荐的糖尿病前期HbA1C诊断标准在中国青少年人群中的适用性.方法 随机抽取辽阳市初中和高中学生933人(13～16岁,女性46.5%),测定HbA1C和空腹血糖,对HbA1C5.7%～6.4%的部分受试者进行口服葡萄糖耐量试验(OGTT),以受试者工作特性(ROC)曲线评价HbA1C对糖尿病前期的诊断价值.结果 符合ADA 2010年推荐的糖尿病前期诊断标准者213人,其中同时符合HbA1C和空腹血糖标准者仅占4.7%.HbA1C诊断空腹血糖升高的ROC曲线下面积为0.50(P=0.97).由HbA1C标准诊断糖尿病前期并行OGTF的68人中18人确定为糖耐量受损或空腹血糖受损,HbA1C诊断糖尿病前期的ROC曲线下面积为0.53(P=0.69).结论 在中国青少年人群中HbA1C不宜作为糖尿病前期的诊断方法.

Abstract：

Objective To evaluate the performance of HbA1C in diagnosis of pre-diabetes in Chinese adolescents.Methods A total of 933 students(aged 13-16 year,46.5% female)without known history of diabetes were selected from junior and senior middle schools in Liaoyang city.HbA1C and fasting plasma glucose(FPG)levels were determined in all participants.Pre-diabetes was diagnosed as according to 2010 American Diabetes Association (ADA)criteria[HbA1C 5.7%-6.4%,FPG(5.6-6.9)mmol/L].The individuals with HbA1C ≥5.7% underwent oral glucose tolerance test(OGTT)and were classified into impaired glucose tolerance(IGT)and impaired fasting glucose(IFG)according to 1999 World Health Organization(WHO)criteria.The performance of HbA1C in diagnosing pre-diabetes by the new criteria was evaluated by the traditional OGTT results based on receiver operating characteristic(ROC)curves.Results Among all participants,213(22.8%)individuals were diagnosed as prediabetic subjects.72.3% of individuals with pre-diabetes were identified by HbA1C alone,23.0% by FPG alone,and only 4.7% by both tests simultaneously.The ROC curve for HbA1C to identify impaired fasting glucose diagnosed by new criteria had an area under the curve(AUC)of 0.50 without statistical significance(P = 0.97).Of the 164 participants with HbA1C 5.7% -6.4%,68 individuals received OGTT,among which 18 subjects were diagnosed as IGT(n= 14)or IFG(n = 4).The ROC curve for HbA1C to identify pre-diabetes diagnosed by OGTT had an AUC of 0.53,without statistical significance(P = 0.69).Conclusion In Chinese adolescents,HbA1C is not suitable for diagnosis or screening of pre-diabetes.     

Antihypertensive drugs as predictors of type 2 diabetes among subjects with impaired glucose tolerance

Aims: to examine the incidence rate of progression to Type 2 diabetes and baseline prognostic risk factors, focusing on hypertension and antihypertensive medication, in a cohort (n=207) with impaired glucose tolerance (IGT). Methods: after 2 and 4.6 (1.9–6.4) years new cases of diabetes were diagnosed by the oral glucose tolerance test (OGTT). Hypertension (BP 160/95 or antihypertensive medication) was included in multiple regression analyses to assess the effect of risk factors on the development of diabetes. Results: diabetes developed in 32 subjects (19%), an incidence of 41/1000 (95% CI 28–57/1000) person-years. In univariate analyses, progression to diabetes was associated with a high (>9.0 mmol/l) 2-h OGTT value (P=0.008), a high fasting insulin (>12.0 mU/l) level (P=0.000), a high triglyceride (≥1.3 mmol/l) level (P=0.028), a high BMI (≥28.0 kg/m²) (P=0.013) and hypertension (P=0.003). The risk for the development of diabetes was not increased in hypertensive subjects without antihypertensive medication compared with normotensive subjects (OR 0.8, 95% CI 0.3–2.6). However, it was increased in subjects with on medication, especially diuretics alone or in combination with other drugs. Hypertensive subjects on diuretics had higher levels of fasting insulin and triglycerides and higher BMIs at baseline than normotensive subjects. After adjustment for 2-h OGTT, fasting insulin, triglycerides and BMI, the OR for diabetes was 7.7 (95% CI 2.1–28.2) in hypertensive subjects using diuretics alone or in combination with other drugs and 2.6 (95% CI 1.0–6.7) in those using other drugs compared with normotensive subjects. The OR of diabetes corresponding to a one-unit increase in the 2-h OGTT concentration was 2.5 (95% CI 1.6–4.0) in the whole cohort. Conclusions: the rate of progression from IGT to Type 2 diabetes in this population was similar to that seen in other studies among Caucasian populations. The use of antihypertensive medication, especially diuretics, and a high 2-h OGTT level were significant predictors of subsequent deterioration to diabetes.