Analysis on the relationship between the decline of ST segment of electrocardiogram and prognosis in AMI patients after PCI treatment

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Objective To study the relationship between the decline of ST segment of electrocardiogram and prognosis in acute myocardial infarction(AMI) patients after percutaneous coronary intervention(PCI) treatment. Methods Two hundred patients with acute myocardial infarction treated in our hospital from June 2016 to June 2017 were selected as the study subjects. The patients were divided into two groups according to their electrocardiogram status after treatment, with 100 cases in each group. The total ST elevation of electrocardiogram in group A decreased by more than 50% after treatment, and that in group B decreased by less than 50% after treatment. The occurrence rate of adverse cardiac events, TIMI blood flow classification, FVEF and the influencing factors of serious adverse cardiac events were observed. Results The incidence of diabetes in group A was higher than that in group B, and the infarct related artery(IRA) recanalization time was also significantly less than that in group B, the differences were significant(P 0.05). The left ventricular ejective fraction(LVEF) of group A was significantly higher than that of group B, and the incidence of cardiac adverse events(7%) was significantly lower than that of group B(25%), the differences were significant (P<0.05). Univariate analysis of adverse cardiac events revealed that diabetes, chest pain, and perfusion events and angina before infarction were all possible risk factors for adverse cardiac events. At 2 h after treatment, ST segment elevation, presence of diabetes and onset of IRA to recanalization time were independent risk factors for adverse cardiac events(P<0.05). Conclusions In patients with acute myocardial infarction, the early changes in the ST segment of the electrocardiogram have an important predictive effect on the patient’s short-term prognosis after receiving PCI treatment. In the case of myocardial reperfusion, the decrease of the ST segment of the electrocardiogram may be more obvious than the TIMI blood flow classification. Key words: Acute myocardial infarction; Percutaneous coronary intervention; Electrocardiogram; ST segment