Comparison of Outcomes Between ST-Segment Elevation and Non-ST-Segment Elevation Myocardial Infarctions Based on Left...

Area of Science:

• Cardiology
• Internal Medicine
• Clinical Research

Background:

• Limited comparative data exists for clinical outcomes between NSTEMI and STEMI stratified by LVEF.
• Understanding these differences is crucial for managing patients with acute myocardial infarction and varying degrees of heart failure.

Purpose of the Study:

• To compare clinical outcomes of NSTEMI versus STEMI across different left ventricular ejection fraction (LVEF) categories.
• To investigate the impact of LVEF on mortality and other patient-oriented composite outcomes in myocardial infarction patients.

Main Methods:

• Analysis of 9854 patients from the Korea Acute Myocardial Infarction Registry-National Institute of Health.
• Patients classified into heart failure with reduced EF (HFrEF), mildly reduced EF (HFmrEF), and preserved EF (HFpEF) groups.
• Primary outcome: composite of all-cause death, recurrent MI, revascularization, HF hospitalization, and stroke.

Main Results:

• In HFrEF and HFmrEF groups, in-hospital mortality was similar, but 3-year mortality was higher in NSTEMI.
• In the HFpEF group, STEMI showed higher in-hospital and 3-year mortality (all-cause and cardiac death) than NSTEMI.
• Excluding in-hospital deaths, 3-year mortality showed no difference between NSTEMI and STEMI in the HFpEF group.

Conclusions:

• In-hospital and 3-year outcomes for NSTEMI and STEMI vary significantly depending on LVEF.
• Stratifying myocardial infarction patients by LVEF provides critical insights into differential prognoses and guides clinical management.