Objective To investigate the correlation between electrocardiogram ischemia grade and target vessel stenosis in acute myocardial infarction（AMI）. Methods Retrospectively collected in June 2018 to June 2020 in our hospital for treatment of 73 cases of acute myocardial infarction patients with clinical data

according to the Birnbaum ischemia ECG classification result

divided into Level Ⅱ group（n=45） and Level Ⅲ group（n=28）

compare the two groups of AMI target vascular stenosis

and analyze ECG ischemia classification with AMI narrow correlation target blood vessels. Results In level Ⅱ group

the degree of luminal stenosis

the target number of vascular lesions

myocardial infarction area was lower than Level Ⅲ group

the difference was statistically significant（p<0.05）. The equation was obtained by Logistic regression analysis: Y=-51.737+2.137 X1+40.629 X2+3.156 X3

suggesting that target vascular stenosis may be an influential factor in the ischemic grade of ECG in elderly patients with AMI（OR>1

p<0.05）. ROC curve was drawn

and the results showed that the AUC of target vascular stenosis combined with the prediction of electrocardiogram ischemia grade in AMI patients was 0.917

which was of high diagnostic value.Conclusions ECG ischemia grade in patients with AMI is closely related to target vessel stenosis

and target vessel stenosis is an influential factor in inducing myocardial ischemia. Clinical monitoring of target vessel stenosis in patients can be strengthened

providing a theoretical basis for clinical implementation of reasonable prevention and treatment programs.