Objective To investigate the correlation of triglyceride glucose product index(TyG index)with the diagnosis of coronary heart disease(CHD)and the severity of coronary stenosis.Methods A total of 404 patients who received coronary angiography for the first time in Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine with unexplained chest pain from December 2021 to October 2022 were included.All subjects were divided into CHD group(n=216)and non-CHD group(n=188).General clin-ical data,laboratory information and coronary angiography results of all participants were collected.The CHD group(n=123)and the non-CHD group(n=123)were obtained after the propensity score matching(PSM).Patients in CHD group were further divided into low Gensini score(Gensini score＜35,n=59)group and high Gensini score(Gensini score ≥ 35,n=64)group according to the me-dian Gensini score.The differences among groups were compared and the relation between TyG index and the severity of coronary artery stenosis was analyzed.Then the predictive value of TyG index for CHD and the severity of coronary lesion was evaluated by Logistic regres-sion and receiver operating characteristic(ROC)curve.Results After PSM,the differences in TyG index,TG,FPG,HDL-C in CHD group were statistically significant compared with the non-CHD group(P＜0.05).Multivariate Logistic regression analysis showed that the TyG index was an independent risk factor for CHD.Spearman correlation analysis showed that the TyG index was positively correlated with the Gensini score(r=0.618,P＜0.001).The ROC curve analysis showed that the area under the curve(AUC)of the TyG index predicting a high Gensini score was 0.873(95％CI:0.802-0.943,P＜0.001).A cut-off value was 7.08,and the sensitivity and specificity were 95.2％and 67.3％,respectively.Conclusion TyG index can be used as an independent risk factor for CHD,and has certain predictive value for the severity of coronary stenosis.

Objective To investigate the predictive value of white blood cell count,LDL-C and fasting blood glucose on the occur-rence of AMI in elderly patients with coronary atherosclerotic heart disease(CAD).Methods A total of 210 elderly patients with CAD were selected and divided into the AMI group as the case group and the chronic CAD group as the control group based on clinical manifes-tations and laboratory and coronary angiography results.The general data,laboratory data,coronary angiography results,and other clinical information of the two groups were retrospectively analyzed.We used the Logistic regression analysis to explore the risk factors for acute myocardial infarction in elderly CAD patients and the receiver operating characteristic curve(ROC)to evaluate the predictive efficacy of white blood cell count,LDL-C and fasting blood glucose on the occurrence of AMI in elderly CAD patients.Results Compared with the chronic CAD group,the AMI group had a higher smoking rate,white blood cell count,CRP,ALT,AST,D-D dimer,fasting blood glu-cose,total cholesterol,LDL-C and Gensini score and lower LVEF(P＜0.05).The Logistic regression analysis showed that white blood cell count(β=0.859,P＜0.001,OR=2.361),LDL-C(β=1.003,P=0.009,OR=2.728)and fasting blood glucose(β=0.495,P=0.007,OR=1.641)were independent risk factors for AMI in elderly CAD patients.The ROC curve analysis showed that when the cut-off values of fasting blood glucose,white blood cell count,and LDL-C were 4.895mmol/L,7.19 x 109/L and 2.635 mmol/L respectively,the area under the curve for predicting AMI was the largest,with values of 0.734,0.859 and 0.735.The area un-der the ROC curve of the combination of the three is 0.902.Conclusion White blood cell count,LDL-C and fasting blood glucose are associated with AMI in elderly patients with CAD.Higher levels of white blood cell count,LDL-C and fasting blood glucose indicate a higher risk of AMI.The combination of the three can serve as a more valuable predictive index.