Advanced Risk Stratification in Non-Ischemic Cardiomyopathy: The Prognostic Role of Cardiac Magnetic Resonance

Area of Science:

• Cardiovascular Imaging
• Cardiology
• Biomedical Engineering

Background:

• Non-ischemic cardiomyopathy (NICM) with reduced left ventricular ejection fraction (LVEF) carries a significant risk of life-threatening cardiovascular events.
• Cardiac magnetic resonance (CMR) imaging offers comprehensive assessment of myocardial tissue characteristics and function, crucial for risk stratification in NICM.

Purpose of the Study:

• To evaluate the role of CMR parameters in identifying patients with NICM and reduced LVEF at high risk for adverse cardiovascular outcomes.
• To assess the predictive value of native T1 mapping, extracellular volume (ECV), and right ventricular ejection fraction (RVEF) for sudden cardiac death (SCD), ventricular arrhythmias, and heart failure hospitalization (HHF).

Main Methods:

• Analysis of 57 first-diagnosed NICM patients with reduced LVEF undergoing CMR.
• CMR assessments included LVEF, RVEF, native T1 mapping, ECV, and late gadolinium enhancement (LGE).
• Patients were monitored for a composite endpoint of SCD, major ventricular arrhythmic events, and HHF.

Main Results:

• During follow-up, 31% of patients experienced cardiovascular events.
• Higher native T1 mapping values (p < 0.001), higher ECV (p < 0.001), and reduced RVEF (p < 0.03) were significantly correlated with increased risk for the composite endpoint.
• Native T1 mapping > 1018 ms (HR: 6.285, p = 0.001) and ECV > 28% (HR: 19.752, p = 0.004) independently predicted adverse events.

Conclusions:

• Elevated native T1 mapping and ECV values identify a high-risk subgroup for arrhythmic events in NICM patients.
• CMR-derived LVEF and RVEF provide additional risk stratification for the composite endpoint.
• Comprehensive CMR assessment can optimize risk stratification and management strategies for NICM patients.