Cardiac Magnetic Resonance Imaging Based Ischemic Injury Pattern in Patients with Acute Myocardial Infarction Sensu...

Area of Science:

• Cardiology
• Medical Imaging
• Biochemistry

Background:

• ST-segment elevation myocardial infarction (STEMI) can impair left ventricular (LV) global systolic function post-revascularization.
• Assessing LV function is crucial for patient outcomes and guiding treatment strategies.

Purpose of the Study:

• To identify factors associated with decreased LV global systolic function in STEMI patients after revascularization.
• To correlate cardiac magnetic resonance imaging (MRI)-derived ischemic injury patterns and laboratory markers with LV systolic function.

Main Methods:

• 109 STEMI patients underwent contrast-enhanced cardiac MRI (1.5 Tesla) 7-10 days post-onset.
• Patients were categorized by left ventricular ejection fraction (LVEF): ≥50% (normal), 40-49% (mildly reduced), and <40% (low).
• Analysis included ischemic injury patterns from MRI and laboratory parameters like natriuretic peptides and troponin I.

Main Results:

• Patients with mildly reduced and low LVEF showed a predominance of ischemic injury pattern parameters compared to those with normal LVEF.
• Identified risk factors for LVEF <50% included male gender, longer time from anginal attack onset to revascularization, coronary artery status, and specific LV parameters.
• Elevated natriuretic peptide and troponin I levels were also associated with decreased LVEF.

Conclusions:

• Cardiac MRI and laboratory markers are valuable in characterizing LV systolic function post-STEMI.
• Key factors influencing reduced LVEF in STEMI patients include demographic, treatment-related, and cardiac injury characteristics.