Abstract: Objective: To compare the coronary flow, reperfusion of the ischemic myocardium and cardiac function of patients with acute non-ST elevation myocardial infarction (NSTEMI) and ST elevation myocardial infarction (STEMI) who received early invasive intervention strategy. Methods: A total of 168 patients with acute myocardial infarction undergoing early coronary intervention were enrolled, including 55 patients in NSTEMI group and 113 patients in STEMI group. The myocardial blush grade (MBG), pre-intervention thrombolysis in myocardial infarction (TIMI) flow, post-intervention TIMI flow, left ventricular end-diastolic volume (LVEDV), left ventricular end-systolic volume (LVSDV), left ventricular mass (LVM) , left ventricular mass index (LVMI) and left ventricular ejection fraction (LVEF) were evaluated for comparison. Results: There were no differences of post-intervention TIMI flow, LVEDV, LVW or LVWI between the two groups (P>0.05). While the ratio of pre-intervention TIMI grade 3 flow, ratio of post-intervention MBG 3, and LVEF of NSTEMI group were better than those of STEMI group (P < 0.05). Conclusion: The myocardial reperfusion and left ventricular function of NSTEMI patients were prior to STEMI patients undergoing early coronary intervention.

Key words: acute myocardial infarction, percutaneous coronary intervention, myocardial blush grade, left ventricular ejection fraction