The factors related to resolution of elevated ST-segment in the patients with acute myocardial infarction having been treated by primary percutaneous coronary intervention

Objective To analyze the factors related to ST-segment resolution in patients with acute myocardial infarction(AMI) after primary percutaneous coronary intervention(PCI).Methods The 18-lead ECG before PCI and 1 h after PCI were reviewed.According to the resolution of the ST-segment elevation in the infarct-related lead,the patients were classified into two groups;group A,with ST-segment resolution ≥50%;group B,with ST-segment resolution 50%.The factors associated with ST-segment resolution were identified.Results The differences between the 2 groups were not related to sex or age,the time from arriving at emergency room to the start of PCI,or the diameter of the infarct-related artery.ST-segment resolution was found to be related to diabetes mellitus history,angina pectoris before MI,infarct area,Killip class of heart function,number of Q waves,and the time from symptom onset to arrival at emergency room.Conclusion The factors that affect ST-segment resolution should be seriously concerned and actively managed in performing PCI to secure a favorable outcome of the AMI.