Myocardial Work Analysis in ST-Elevation Myocardial Infarction: Insights into Left Ventricular Ejection Fraction-A...

Area of Science:

• Cardiology
• Echocardiography
• Cardiovascular Imaging

Background:

• Left ventricular ejection fraction (LVEF) is a standard prognostic marker in acute ST-elevation myocardial infarction (STEMI).
• Left ventricular myocardial work (MW) provides additional prognostic insights by accounting for loading conditions.
• Echocardiographic assessment of MW offers a more comprehensive view of cardiac function post-MI.

Purpose of the Study:

• To investigate the prognostic value of MW indices in STEMI patients stratified by LVEF.
• To determine if MW parameters can improve risk stratification beyond traditional LVEF assessment.
• To identify specific MW indices that predict adverse outcomes in different LVEF categories.

Main Methods:

• Prospective study of 119 STEMI patients undergoing primary percutaneous coronary angioplasty.
• Transthoracic echocardiography performed before discharge to assess MW indices.
• Patients stratified into reduced (≤40%), mildly reduced (41-49%), and preserved (≥50%) LVEF groups.
• Primary endpoint: composite of heart failure hospitalization, ventricular arrhythmias, all-cause mortality, and new acute coronary syndromes.

Main Results:

• Patients with preserved/mildly reduced LVEF showed higher global constructive work (GCW) and efficiency, and lower global wasted work (GWW) compared to reduced LVEF.
• GCW was the strongest predictor of adverse outcomes in the preserved LVEF group (AUC=0.730, p=0.035).
• GWW demonstrated significant predictive performance in the reduced LVEF group (AUC=0.787, p=0.001).

Conclusions:

• Myocardial work indices, specifically GCW and GWW, offer significant prognostic value in STEMI patients across different LVEF categories.
• MW enhances risk stratification beyond LVEF alone.
• These findings support the integration of MW assessment into clinical practice for improved management of STEMI patients.