The relationship between insulin resistance and risk of long-term mortality in people without diabetes: a 30-year follow-up of the Daqing Diabetes Study / 中华内科杂志

Objective:To determine whether insulin resistance is associated with all-cause mortality in subjects without diabetes.Methods:A total of 505 participants without diabetes, 198 with normal glucose tolerance (NGT) and 307 with impaired glucose tolerance (IGT), were recruited from the Daqing Diabetes Study. The participants were followed up for 30 years. They were stratified into three groups (tertiles) according to baseline homeostasis model assessment of insulin resistance(HOMA-IR) levels, as the HOMA-IR 0, the HOMA-IR 1 and the HOMA-IR 2 groups, to assess the predictive effect of insulin resistance on risk of all-cause mortality.Results:During the 30-year follow-up, 52, 56 and 78 participants died across the three HOMA-IR groups, respectively. The corresponding mortality per 1 000 person-years (95 %CI) were 12.12 (9.56-15.01), 13.10 (10.46-16.03) and 19.91 (16.73-23.15), respectively. Participants in the HOMA-IR 2 group had a significantly higher risk of death than those in the HOMA-IR 0 group after adjustment of age, sex and smoking status ( HR=1.97,95 %CI 1.38-2.81, P<0.001). Cox analyses showed that a one standard deviation increase in HOMA-IR was associated with a 22% increase in the mortality after adjustment of potential confounders ( HR=1.22, 95 %CI 1.08-1.39, P=0.002). Conclusions:Insulin resistance is associated with increased risk of all-cause death in Chinese people without diabetes, suggesting that improving insulin resistance could be beneficial for people without diabetic in reducing risk of long-term all-cause mortality.

Long-term effects of metabolically healthy obesity on the risks of diabetes, cardiovascular disease events and its mortality over 23 years in the China Daqing diabetes prevention study / 中华内分泌代谢杂志

Objective:To investigate the long-term effects of metabolically healthy obesity on the risks of type 2 diabetes, cardiovascular disease events, and its mortality over a 23-year follow-up.Methods:Based on the results of an oral glucose tolerance test, there were 519 participants with normal glucose tolerance and 630 with newly diagnosed type 2 diabetes enrolled in 1986 and then given to assess the long-term clinical outcomes during the 23-year follow-up in Daqing. Metabolically healthy obesity was defined as the overweight and obese individuals with no metabolic abnormalities (diabetes, hypertension, hyperlipidemia). Finally, we identified 682 participants (350 with normal glucose tolerance and 332 with newly diagnosed diabetes). They were divided into five groups: 211 individuals with metabolically healthy normal weight (MHNW group), 58 with metabolically healthy overweight and obesity (MHO group), 81, 109, 223 were metabolically unhealthy overweight and obesity with hypertension (MUHO group), type 2 diabetes (MUDO group), hypertension and diabetes (MUHDO group). Incidences of type 2 diabetes, morbidity and mortality of cardiovascular disease were compared among these groups.Results:Over 23 years, instead of the morbidity and mortality of cardiovascular disease, the incidence of type 2 diabetes in MHO group was two times higher than in MHNW group ( 24.1%, 12.5/1 000 person years vs 10.9%, 5.2/1 000 person years, P=0.01), with an age, sex, and smoking history-adjusted hazard ratio ( HR) of 2.42 (95% CI 1.24-4.74, P=0.01). The morbidity and mortality of cardiovascular disease in the groups of overweight and obesity with metabolically unhealthy were higher than in MHNW group, and increased across the subjects with MUHO, MUDO, MUHDO ( P<0.05). Conclusion:Compared with metabolically healthy normal weight participants, the metabolically healthy obese group was at increased risk of type 2 diabetes but not cardiovascular disease events and its mortality. On the contrary, the overweight and obese groups with metabolic abnormalities had significant higher incidence of type 2 diabetes, morbidity and mortality of cardiovascular diseases.

Subjects with impaired glucose tolerance returned to normal glucose status for six years had lower long-term risk of diabetes: 20 years follow up of Daqing diabetes prevention study / 中华内科杂志

Objective To explore the influence of lifestyle intervention on long-term diabetes in subjects with impaired glucose tolerance (IGT) returned to normal glucose tolerance (NGT) within 6 years.Methods A total of 577 subjects (aged 25-74 years old) with IGT in Daqing were enrolled and randomly assigned to control,and diet,exercise and diet plus exercise groups in a six-year intervention trial in 1986.Subjects who were non-diabetic at the end of the intervention were followed up for additional 14 years.Results Among all the subjects,41.38％ of them who had returned to NGT from IGT within 6 years maintained NGT status after 20 years,and had a lower incidence of diabetes than subjects maintained IGT status (46.55％ vs.75.25％).Of note,in the intervention group,the percentage of participants developed diabetes in the NGT subjects was significantly lower than that in the IGT group (43.71％ vs.76.25％) after 20 years.There was high long-term risk for diabetes in the IGT subjects after the adjustment of age,sex and baseline glucose (HR=1.81,95％CI 1.27-2.58,P=0.001),whereas in the non-intervention group,no significant difference could be viewed in long-term diabetic risk between subjects maintained IGT status and those returned to NGT (71.43％ vs.65.22％) after adjusting of the same confounders (HR=1.03,95％CI 0.45-2.35,P=0.94).Conclusions IGT subjects who had returned to NGT in early years had lower risk for future diabetes than those who remained IGT.However,this beneficial effect could only be viewed in the intervention group,but not in the non-intervention group.

Preliminary Study for Continuous Subcutaneous Insulin Infusion in Type 2 Diabetes Patients With Heart Diseases / 中国循环杂志

Objectives: To evaluate the effect and safety of 14-day continuous subcutaneous insulin infusion (CSII) in type 2 diabetes patients with heart diseases. Methods: A total of 22 consecutive type 2 diabetes patients (history ≤ 5 years) with heart diseases treated in our hospital from 2011-03 to 2013-08 were studied. There were 20 male, and the with the mean age of patieuts (48.15 ± 9.80) years, all patients without standard hypoglycemic treatment before admission. The patients received 14-day CSII for enhanced treatment and the blood glucose level, insulin function and insulin sensitivity were compared before and after the treatment. Results: After CSII treatment, the blood glucose level was obviously decreased, fasting blood glucose (FBG) and postprandial blood glucose at 30, 60 and 120 min were improved, all P Conclusion: CSII may quickly relieve glucotoxicity and improve insulin sensitivity in type 2 diabetes patients with heart diseases. Some patients may alleviate drug burden in clinical practice.

Improving glucose intolerance linked with the reduction of cardiovascular disease events and mortality in a Da Qing population with pre-diabetes-a 20 year follow-up study / 中华内分泌代谢杂志

Objective To investigate if improving or slowing the progression of glucose intolerance might be linked with the reduction of cardiovascular disease(CVD)events and mortality in a Da Qing population with prediabetes.Methods In 1986,577 subjects with impaired glucose tolerance in 33 clinics in Daqing city were randomly assigned to either the control group or one of three lifestyle intervention groups(diet,exercise,or diet plus exercise)to receive a 6 year lifestyle intervention.All the participants were followed for 14 years(1993-2006)after completion of the 6 year active interventions to assess the long-term effect of the interventions.In this post-hoc analysis,the participants were stratified into four subgroups(quartiles)based on their 2 h plasma glucose(2hPG)level after glucose loading at the end of the active intervention,in order to analyze the impact of plasma glucose level on CVD events and mortality.Results During the 20-year follow-up,there were a total of 142 deaths(68 of which were attributed to CVD)and 211 first CVD events(145 strokes and 66 myocardial infarctions).From the highest to the lowest levels of 2hPG in the 4 quartiles,the all-cause mortality(17.8,12.7,10.9,and 9.7/1 000 personyears),CVD mortality(9.1,5.9,6.1,and 4.9/1 1300 person-years)and the incidence of first CVD events(30.4.24.0,18.8,and 19.7/1 000 person-years)showed a clear trend of decline.In multivariate analyses,controlled for age,sex,body mass index,smoking habit,blood pressure,and intervention methods at baseline,the results showed that the 5 mmol/L elevation of 2hPG level after glucose loading in 1992 significantly increased the all-cause mortality(HR 1.335.P=0.005),the incidences offirst CVD events(HR 1.227,P=0.012)and stroke(HR 1.213,P=0.026).Conclusion In pre-diabetes population.if the lifestyle intenrentions are substantially efficacious in improving glucose intolerance,the CVD risk and mortality will be reduced.

Recombinant human glucagon-like peptide-1 (7-36) enhances insulin release and insulin mRNA expression in INS-1 cells / 中华内分泌代谢杂志

In INS-1 cells, the insulin secretion was investigated by radioimmunoassay (RIA) after 4 h incubation in medium containing different concentrations of glucose and recombinant human glucagon-like peptide-1 (rhGLP-1) (7-36). Insulin mRNA level in INS-1 cells was assessed by a semi-quantitative RT-PCR method. rhGLP-1 (7-36) is not only a powerful insulin secretagogue, but also can increase insulin gene expression in INS-1 cells.