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。     

The effect of glycemic control on salivary lipid peroxidation in type II diabetic patients

Background and objectiveHyperglycemia and some disturbance in antioxidant system lead to free radicals production and oxidative stress. Assessment of some products of oxidative stress could be effective in evaluation of diabetic control. This study aimed at evaluation of glycemic control on salivary lipid peroxidation in diabetic patients.MethodsThis case control study has been done on 44 diabetic (type II) and 44 healthy subjects. Un-stimulated saliva was collected and correlation between malondialdehid (MDA) as an end -product of lipid peroxidation and HbA1c was assessed.ResultsMDA and HbA1c of diabetic patients were significantly higher than control group. There was a indirect correlation between MDA and glycemic control level.ConclusionEvaluation of salivary MDA levels could be useful in prediction of glycemic control.     

Diabetes control and complications: the role of glycated haemoglobin, 25 years on.

The long-term complications of diabetes have major consequences for individual subjects and growing healthcare delivery and cost implications for society. Evidence for the benefits of good glycaemic control, as monitored by glycated haemoglobin measurements, has been developed in the 25 years since they were introduced to the point where HbA(1c) assays play central roles in patient management, clinical guidance and audit, and clinical trial design. In this review this evidence is examined and three classes of uncertainty identified that diminish confidence in the effectiveness of these roles for HbA(1c). 1 Analytical variability between different methods for HbA(1c) has restricted the application of clinical targets and this problem has recently been addressed by reference method standardization. There are two approaches to this which result in different HbA(1c) values and this discrepancy needs to be resolved. 2 Biological variability in HbA(1c) values between individuals also restricts its predictive role when applied to populations. The correlations between HbA(1c) measurements and various components of glycaemia (overall, fasting, postprandial) are still uncertain and differences in protein glycation and de-glycation are greater between subjects than often thought. The influence of variability in erythrocyte life span is an area where research is needed, especially in diabetic subjects. 3 Clinical variability is the most important and complex area of uncertainty. A predictive link between HbA(1c) and clinical outcomes is not as clear-cut as often stated. The correlation with the development of microvascular disease is well established in Type 1 diabetes, but in Type 2 subjects (90% of those with diabetes) the evidence that HbA(1c) monitoring is of value in predicting or preventing macrovascular disease is not strong, although it is the major cause of morbidity and early death in this group. It is recommended that, as a matter of urgency, these issues be examined, particularly within the context of self-care in diabetes.     

Glycosylated haemoglobin (HbA1c) in iron- and vitamin B12 deficiency

Glycosylated haemoglobin (HbA1c) was measured in 10 patients with iron deficiency anaemia, 10 patients with vitamin B12 deficiency anaemia and 10 healthy controls. Initially there were no significant differences between the groups (P greater than 0.4), but after treatment with iron and vitamin B12 for 3 and 6 weeks, the glycosylated haemoglobin concentration decreased significantly (P less than 0.01). It was concluded that glycosylated haemoglobin is a sensitive marker of the changes in the erythrocyte population that are observed when predominantly immature erythrocytes are being produced.     

2型糖尿病患者动态血糖变化与糖化血红蛋白水平的相关性分析

目的探讨2型糖尿病患者动态血糖变化与糖化血红蛋白(HbAlc)水平的相关性,为预防2型糖尿病并发症的发生提供参考。方法选取2009-05～2011-05收治的18例2型糖尿病患者,采用动态血糖监测系统(CGMS)观察2型糖尿病患者血糖变化与HbAl c的相关性。结果经Pearson分析显示,HbAlc与日内血糖水平呈正相关(P0.05),与餐后血糖波动幅度(PPGE)无明显相关性(P0.05)。结论 CGMS能详细显示日内血糖波动情况,HbAlc能反映日内整体血糖水平。     

Comparison between a rapid glycohaemoglobin (HbA1c) immunoassay and other indices of glycaemic control

The aims of the study were to compare glycohaemoglobin (Hb_A1c) values measured by DCA (a benchtop analyzer primarily designed for within-clinic rapid Hb_A1c determination) to a reference Hb_A1c method and home blood glucose monitoring, and to explore the possibility of an uniform expression of data. A total of 103 blood samples and the corresponding mean capillary glucose values (4.4±1.2 tests/day) of the preceding 2 months were collected from 34 insulin-dependent diabetic adults. We measured the correlations and agreements using the residual plots method and regression equations between Hb_A1c measured by DCA and high-pressure liquid chromatography (HPLC), and between DCA and capillary glucose values. A highly significant correlation (r ²=0.85,P<0.001) and an acceptable agreement (97% of values within 2 SD of the mean difference of 0.9%±0.4%) was found between DCA and HPLC values. The regression equation calculated on the first half of the cases was: DCA (%)=0.72 HPLC (%)+1.38. Of DCA values expressed in HPLC terms using this equation 87% fell within a clinically acceptable confidence interval when compared with measured HPLC data. A significant correlation (r ²=0.40,P<0.01) was found between DCA and capillary glucose values, and the regression equation was: DCA (%)=0.34 capillary glucose (mM)+4.44. Of glycaemic levels calculated from DCA values using this formula 82% fell within a clinically acceptable error range when compared with measured glycaemic values. We conclude that the three methods of assessment of diabetes control are well correlated and that it is possible, with a degree of precision acceptable for the clinical setting, to express all data in uniform units, e.g. mM of capillary glucose or percentage of HPLC-Hb_A1c, though a simple correspondence table based on our transfer equations may be clinically sufficient and more handy.     

The relationship between birth weight and maternal glycated haemoglobin (HbA1c) concentration in pregnancies complicated by Type 1 diabetes.

AIM: To examine the relationships between maternal HbA1c concentration at different time points and birth weight in pregnancies complicated by pre-existing Type 1 diabetes. METHODS: A comprehensive audit dataset was collected prospectively on all deliveries in Scotland to women with pre-existing Type 1 diabetes occurring between 1 April 1998 and 31 March 1999. Data items included HbA1c concentrations prior to conception and in each of the three trimesters of pregnancy, and birth weight. Relationships between standardized birth weight and HbA1c concentrations at each of the four time points were examined using correlation analysis. RESULTS: Standardized birth weight (Z scores) could be calculated for 203 of 208 singleton liveborn infants. HbA1c concentrations, standardized to correct for assay differences among hospitals, at different time points were available for between 134 (pre-pregnancy) and 192 (third trimester) cases. Standardized birth weight, relative to a reference population, showed a unimodal distribution, shifted to the right (mean, +1.57 sd). There was a significant negative correlation between pre-pregnancy HbA1c and birth weight (Spearman's R, -0.208; P = 0.016). There were no statistically significant correlations for other time points. CONCLUSIONS: Standardized birth weight scores of the infants of diabetic mothers are higher than those of a reference population. There is no simple relationship between maternal glycaemic status and birth weight, but there appears to be a paradoxical inverse relationship between pre-pregnancy glycaemic control and standardized birth weight.     

江苏省2型糖尿病患者血糖控制及治疗用药情况调查

目的了解江苏省2型糖尿病（T2DM）患者的血糖控制情况,分析治疗方法与血糖控制的关系。方法采用横断面研究方法,以调查问卷形式收集患者年龄、病程、降糖药物的使用情况等,留取血标本检测HbA1c。根据HbA1c水平将患者分为达标组（HbA1c〈6．5％）和未达标组（HbA1c≥6．5％）;根据降糖治疗情况分为胰岛素（Ins）组、胰岛素联用口服降糖药（Ins＋OA）组、口服降糖药（OA）组、生活方式干预（LS）组。结果入选T2DM患者2966例,年龄（56．4±11．2）岁,糖尿病平均病程（6．3±5．7）年,HbA1c值（7．2±1．6）％,HbA1c≥6．5％的患者占59．8％。（1）平均病程Ins组[（7．6±6．5）年]与Ins＋OA组[（8．2±6．2）年]均高于OA组C（5．3±5．0）年]（P〈0．01）。HbA1c均值及未达标比例Ins组[（7．4±1．6）％,未达标比例65．9％]与Ins＋OA组[（7．5±1．5）％,未达标比例77．9％]均高于OA组[（7．0±1．6）％,未达标比例52．4％]（P〈0．01）。（2）HbA1c达标组与未达标组病程分别为（4．8±4．9）年和（7．3±6．1）年（P〈0．01）,两组中胰岛素联合口服降糖药治疗者分别占11．5％和27．2％（P〈0．01）,单用胰岛素治疗者分别占17．0％和22．1％（P〈0．01）。结论江苏省T2DM患者血糖控制现状比3年前全国调查情况有所改善,但仍有相当比例的患者HbA1c水平没有达到IDF及《中国2型糖尿病防治指南》推荐标准。接受胰岛素治疗的患者HbA1c均值及不达标比例明显高于其他治疗组,表明由于病程延长及口服降糖药用药失效导致病情恶化后,再选择胰岛素治疗,血糖控制情况并不理想。     

综合管理有助于1型糖尿病血糖控制

目的探讨综合管理对1型糖尿病（T1DM）血糖控制的影响。方法纳入2010年8月6日至2013年1月1日在中山大学附属第三医院就诊随访的T1DM患者,实施综合管理,包括3个月1次的规律随访、糖尿病教育、治疗方案调整及免费的糖化血红蛋白（HbAlC）检测等。根据HbAlc是否达到相应年龄段的血糖控制目标将患者分为达标组和未达标组。采用logistic回归模型分析HbAlC达标与各因素的相关性。结果共纳入144例T1DM患者,男64例,女80例,中位年龄29．0岁（四分位间距22．0,38．0,下同）,糖尿病病程4．5年（2．8,9．0）,体质指数（BMI）19．8kg／m^2（18．9,22．0）,干预前HbAlc8．2％（6．7％,9．8％）,41例（28．5％）HbAlc达标。完成3、6、9、12个月随访的患者分别为97、50、44、36例,HbAlC达标率分别为50．5％、80％、77％、63．9％。随访3、6、9、12个月HbAlc分别为7．2％（6．4％,8．3％）、7．2％（6．6％,7．9％）、7．0％（6．4％,7．7％）、7．0％（6．5％,8．0％）,与干预前比较差异均有统计学意义（均P〈0．05）。Logistic回归分析显示年龄较大、BMI较小、自我血糖监测（SMBG）频率较高的和病程较短的患者血糖控制较好。结论综合管理有助于T1DM的血糖控制,增加自我血糖监测频率对血糖控制有利。     

Effectiveness of intervention program on the change of glycaemic control in diabetes with depression patients: A meta-analysis of randomized controlled studies

AimThe glycaemic control of diabetes with depression was inconsistent from randomized controlled studies. This meta-analysis aimed to explore the effectiveness of intervention methods in diabetes with depression.MethodsThis study systematically searched electronic databases (PubMed, EBSCO, Elsevier, Springer, Wiley, and Cochrane) for studies published up to August 17, 2020. Standardized mean difference (SMD) and 95%CI were used to evaluate the effectiveness of interventions on HbA1c. Heterogeneity was estimated using the I² statistic. Begg’s test was used to assess the possible publication bias among studies.ResultsTwelve studies of 2444 cases were included in this study. The overall SMD is ?0.22 and 95%CI ?0.33 to ?0.10 in 0–6 months of intervention group. The I² and P were 18.4% and 0.26. There are no publication bias tested (z = 0.37, P = 0.72).ConclusionCognitive behavioral therapy and mindful self-compassion might be effective method to improve glycaemic control of diabetes with depression in 0–6 months.     

Fetal haemoglobin levels in adult Type 1 (insulin-dependent) diabetic patients

Summary Glycated haemoglobin levels (HbA₁ and HbA_1c) are established parameters of long-term glycaemic control in diabetic patients. Depending on the method used, fetal haemoglobin interferes with the assays for glycated haemoglobin. If present in high amounts, fetal haemoglobin may lead to overestimation of glycated haemoglobin levels, and therefore, of average blood glucose concentration in diabetic patients. Glycated (HbA_1c) and fetal haemoglobin levels were measured by high pressure liquid chromatography in 60 (30 female) adult Type 1 (insulin-dependent) diabetic patients of Swiss descent, and were compared with levels obtained from 60 normal, non-diabetic control subjects matched for age and sex. Fetal haemoglobin levels were significantly higher in the diabetic patients (0.6±0.1%, mean±SEM; range: 0–3.6%) than in the control subjects (0.4±0.1%, p<0.001). Elevated fetal haemoglobin levels (0.6%) were found in 23 of 60 diabetic patients (38%) compared to 9 of 60 control subjects (15%; ²=8.35, p<0.01). In addition, fetal haemoglobin levels in diabetic patients are weakly correlated with glycated haemoglobin (HbA_1c) (r=0.38, p<0.01). Fetal haemoglobin results were confirmed with the alkali denaturation procedure, and by immunocytochemistry using a polyclonal rabbit anti-fetal haemoglobin antibody. A significant proportion of adult patients with Type 1 diabetes has elevated fetal haemoglobin levels. In certain patients this may lead to a substantial over-estimation of glycated haemoglobin levels, and consequently of estimated, average blood glucose levels. The reason for this increased prevalence of elevated fetal haemoglobin remains unclear, but it may be associated with poor glycaemic control.Presented in part at the 59th Annual Meeting of the Swiss Society of Internal Medicine, Lugano, 1991 and at the 14th International Diabetes Federation Congress, Washington, 1991     

Impaired Vibration Perception Threshold and Long-term Mean HbA1c in Patients with Type 1 Diabetes Mellitus

The impact of long-term glycaemic control, assessed as HbA_1c for 5 years or more, on vibration perception threshold (VPT) in Type 1 (insulin-dependent) diabetes was investigated. Patients with diabetes onset before 31 years of age and with a diabetes duration of <26 years were included. HbA_1c was on average monitored over 9.2 years with 32 measurements. VPT was measured with biothesiometry on the big toes, and compared to non-diabetic reference values standardized for age and height. The biothesiometry readings in the group of 207 patients were elevated. The median z score (z-transformation of ln (VPT)) was 1.4 in the diabetic population. Patients with HbA_1c >7.8 % (highest quartile) had a relative risk of 9.2 (95 % CI 3.5 < RR < 24.0) to be among the 10 % with the highest z score for VPT, compared to patients with HbA_1c < 7.8 %. Stepwise forward linear regression analysis with the log normal of the VPT as dependent variable included age, HbA_1c, height, body mass index, macroalbuminuria, and hypertension (>140/90 mmHg or antihypertensive treatment) as explaining variables. In conclusion, impaired VPT was strongly associated with high long-term HbA_1c.     

Diagnostic value of glycated haemoglobin (HbA1c) for the early detection of diabetes in high‐risk subjects

Objective The aim of this study was to assess the validity of fasting plasma glucose (FPG) and/or glycated haemoglobin (HbA_1c) as screening tests for the early detection of diabetes in high‐risk subjects. Methods A total of 392 subjects (149 male and 243 female) with risk factors for diabetes were included. All subjects underwent a 75‐g oral glucose tolerance test and HbA_1c measurement. Receiver operating characteristic curve analysis was used to examine the sensitivity and specificity of FPG and HbA_1c for detecting diabetes, which was defined as a FPG ≥ 7.0 mmol/l or a post‐challenge 2‐h plasma glucose ≥ 11.1 mmol/l. Results The prevalence of newly diagnosed diabetes was 22.4% (n = 88). The current guideline of FPG ≥ 7.0 mmol/l for diabetes screening detected only 55.7% of diabetic subjects. The optimal cut‐off points of HbA_1c and FPG for the diagnosis of diabetes were 6.1% (sensitivity 81.8%, specificity 84.9%) and 6.1 mmol/l (sensitivity 85.2%, specificity 88.5%), respectively. The screening model using FPG ≥ 6.1 mmol/l and/or HbA_1c ≥ 6.1% had sensitivities of 71.6–95.5% and specificities of 77.6–95.7% for detecting undiagnosed diabetes. Conclusions The current American Diabetes Association diagnostic criteria, based only on FPG, are relatively insensitive in the detection of diabetes in high‐risk subjects. The simultaneous measurement of FPG and HbA_1c might be a more sensitive screening tool for identifying high‐risk individuals with diabetes at an early stage.     

Elevated long-term glycated haemoglobin precedes proliferative retinopathy and nephropathy in Type 1 (insulin-dependent) diabetic patients

Summary The importance of glycaemic control for the development of proliferative retinopathy and nephropathy was assessed by monitoring glycated haemoglobin for 5 years or more before the diagnosis of these complications. The study comprised Type 1 (insulin-dependent) diabetic patients diagnosed at an age less than 31 years, and with diabetes duration 25 years or less. They were followed for an average of 7.9 years with 3.3 measurements per year. Of 172 patients screened for retinopathy 60 had no retinopathy, 104 had background retinopathy, and 8 had proliferative retinopathy. The mean HbA_1c (95% confidence intervals) of the groups was 6.4% (6.2–6.7%), 7.3% (7.1–7.5%) and 8.9% (8.1–9.6%), respectively (p<0.0001); the mean duration of diabetes was 12, 18, and 17 years. Of 186 patients 7 had nephropathy (albuminuria>200 mg/l). Mean HbA_1c in patients without nephropathy was 7.0% (6.8–7.1%) and in patients with nephropathy 8.8% (7.8–9.9%,p<0.001). Mean diabetes duration was 16 years in both groups. Multiple logistic regression including mean HbA₁₀, age at onset, duration, sex, and hypertension, was for both proliferative retinopathy and nephropathy significant only for mean HbA_1c. In all cases, proliferative retinopathy and nephropathy were preceded by poor glycaemic control over several years, suggesting that these complications are caused by poor glycaemic control.     

Prevalence and determinants of restless leg syndrome in type 2 diabetes mellitus (T2DM) in Pakistan

Background and aimsRestless legs syndromes (RLS) are intrinsic sleeping disorder and its prevalence rate is 10–15% in general population but it is observed that prevalence rate is different in diabetes patients. Current study aims to find prevalence and determinants of RLS in people living with type 2 diabetes mellitus in Pakistan.MethodA multicenter cross-sectional observational study was conducted in 388 diabetes patients attending daily diabetes clinics and teaching hospitals in Pakistan’s twin city between August 2019 and February 2020. The chi-square test and linear regression were used to detect RLS-related factors in type 2 diabetes mellitus.ResultsThe prevalence of RLS found was; 3.1% patients with diabetes were suffering from very severe RLS, 23.5% from severe RLS, 34% from moderate RLS, 21.1% from mild RLS and 18.3% from non-RLS. Gender, age, education, blood glucose fasting (BSF), blood glucose random (BSR) and HBA1c were found to be significant predictors of RLS in patients with diabetes.ConclusionPolicy makers can develop local interventions to curb the growing RLS prevalence by keeping in control the risk factors of RLS in people living with type 2 diabetes.     

2型糖尿病患者24小时动态血糖变化与糖化血红蛋白水平的相关性

目的探讨T2DM患者24小时动态血糖变化与HbA1C水平之间的相关性。方法根据HbA1c水平将578名T2DM患者分为4个组,采用动态血糖监测系统（CGMS）监测患者全天血糖。结果组内分析显示,仅在7．5％≤HbA1c〈10．0％组及HbA1c≥10．0％组内HbA1c水平和高血糖曲线下面积、高血糖持续时间、平均血糖及血糖波动幅度呈正相关;仅在HbA1c〈6．5％组内HbA1c水平和空腹状态低血糖曲线下面积及持续时间呈负相关。结论当HbA1c处于不同区间内时,HbA1c水平与高血糖及低皿糖暴露、平均血糖水平及血糖波动幅度的相关性不同。     

2型糖尿病患者的血糖控制和医疗费用的多因素分析

目的　了解中国大城市 2型糖尿病 (T2DM )患者的血糖 (PG)和糖化血红蛋白 (HbA1c)及其控制情况 ,以及影响患者医疗费用的因素。　方法　对国内 11个大城市的T2DM患者抽样调查 ,收集其疾病控制和治疗费用数据 ,以及相关的影响因素。调查的 1111例T2DM患者中 ,门诊 6 5 8例 ,住院 4 5 3例 ,采用描述统计的方法分析患者的HbA1c和PG控制情况 ,用多因素模型分析医疗费用的主要影响因素。　结果　 6 8%患者的空腹血糖 (FPG)没有得到很好控制 ( >7.0mmol/L) ,4 2 %的HbA1c控制效果不佳 ( >7.5 % )。门诊医疗费用的多因素分析中医院级别 (P <0 .0 0 1)、并发症 (P<0 .0 0 1)和末次空腹静脉血糖控制水平 (P <0 .0 5 )是影响患者就诊费用的主要因素。住院医疗费用多因素分析结果显示 ,住院天数 (P <0 .0 0 1)、医院级别、并发症 (P <0 .0 0 1)、家庭人均收入是影响患者住院费用的主要因素。　结论　中国大城市中 5 0 %左右T2DM患者按照 ( 2 0 0 2年的治疗情况 )PG和HbA1c控制效果不佳 ,并发症和PG控制效果不好是T2DM患者医疗费增多的显著因素     

The statins effects on HbA1c control among diabetic patients: An umbrella review of systematic reviews and meta-analyses of observational studies and clinical trials

Statins have impacts on the metabolism of glucose that might influence the progress of diabetes in non-diabetics or affect glycemic control in patients with existing diabetes. Experimental proof has been contradictory about whether some statins display beneficial properties while others indicate harmful impressions. Some systematic reviews of statins had stated conflicting findings on the concern of glucose metabolism. The current study investigates the published systematic reviews and meta-analyses to combine their results and give a clear situation regarding the influence of statins therapy on glycated hemoglobin (HbA1c). This study has valuable strength points; long follow-up period and big sample size.