Objective To investigate the association between the proportion of peripheral blood intermediate monocyte subset(Mon2)and prognosis in patients with acute myocardial infarction(AMI)receiving percutaneous coronary intervention(PCI).Methods A total of 100 AMI patients who underwent PCI between March 2021 and June 2022 were enrolled.Peripheral venous blood sam-ples were collected within 24 hours of onset in all patients,and monocyte subsets were analyzed using three-color flow cytometry.Patients were followed up for at least 1 year after discharge,and major ad-verse cardiovascular events(MACE)were recorded.Results The optimal cut-off point for predic-ting MACE occurrence 1 year after PCI in AMI patients based on the Mon2 proportion was 25.65％(area under the curve=0.758,95％CI,0.607 to 0.909,P=0.002),with a sensitivity of 64.3％and a specificity of 86.0％.Patients were divided into high Mon2 proportion group and low Mon2 proportion group according to the optimal cut-off value.There were significant differences in globu-lin,creatinine,fasting blood glucose,left ventricular end-systolic diameter,and Mon2 proportion between the two groups(P＜0.05).After adjusting for potential confounding factors using Cox re-gression,Mon2 proportion was found to be an important indicator for predicting poor prognosis after AMI.Kaplan-Meier survival analysis showed that the Mon2 proportion had a significant impact on the incidence of MACE in AMI patients with different risk stratifications.Conclusion Mon2 can improve the accuracy of predicting MACE after PCI,providing a new perspective for prognostic as-sessment in AMI patients.It is helpful for guiding clinical treatment decisions and improving patient prognosis.

Objective To study the diagnostic value of miR-126 and ICAM-1 in peripheral blood endo-thelial microparticles(EMPs)of the patients with acute myocardial infarction(AMI).Methods A total of 45 patients with definitely diagnosed AMI in this hospital from September 2021 to June 2022 were selected as the AMI group.Other 45 healthy subjects in the same age group and sex were selected as the control group.Be-fore coronary angiography,the patient's peripheral blood was collected,and the flow cytometry was used to conduct the qualitative and quantitative analysis on EMPs.The expression levels of miR-126 and ICAM-1 in EMPs were determined by using fluorogenic quantitative PCR and ELISA.The receiver operating characteristic(ROC)curve was adopted to evaluate the diagnostic value of the related indicators for AMI.Results There was no statistically significant difference in the general data such as age,gender and BMI between the two groups(P＞0.05).The biochemical indicators such as PLT,BUN,TC,TG and HDL-C had no statistical difference between the two groups(P＞0.05).The expression level of miR-126 in the AMI group was significantly lower than that in the control group,the expression level of ICAM-1 in the AMI group was higher than that in the control group,and the differences were not statistically significant(P＜0.05).The miR-126 expression level in the AMI group was lower than that in the control group,the ICAM expression level was higher than that in the control group,and the differences were statistically significant(P＜0.05).The multivariate logistic regression results showed that miR-126,ICAM-1 and CK-MB had the independent correlation with the AMI occurrence(P＜0.05).The area under the curve(AUC)of mir-126 for diagnosing AMI was 0.813(95％CI:0.725-0.903,P＜0.001),which of ICAM-1 was 0.848(95％CI:0.764-0.933,P＜0.001),and which of miR-126 and ICAM-1 combination diagnosis was 0.922(95％CI:0.870-0.946,P＜0.001).Conclusion The miR-126 and ICAM-1 expression levels in EMPs have the independent correlation with AMI,and the both have the di-agnostic value for AMI.