ISSN 2996-8215
International Journal of Cardiology | Vol. 2, No. 3, March 2011 | pp. 17–24
DOI: 10.46882/2011/IJC/000024
Review Article
The Evolving Role of Cardiac Magnetic Resonance Imaging in the Assessment of Non-Ischemic Cardiomyopathies
Sarah L. Jenkins¹, David M. Ross²
¹Department of Cardiovascular Imaging, Toronto General Hospital, University of Toronto, Toronto, Ontario, Canada
²Division of Cardiology, Alfred Hospital, Monash University, Melbourne, Victoria, Australia
Abstract:
Non-ischemic cardiomyopathies (NICMs) encompass a heterogeneous group of myocardial diseases with diverse etiologies, pathophysiologies, and clinical trajectories. Traditional diagnostic modalities often fail to differentiate specific phenotypes or precisely risk-stratify patients. Over the past decade, cardiac magnetic resonance (CMR) imaging has emerged as an indispensable diagnostic and prognostic tool. This review synthesizes current clinical data on the utility of CMR tissue characterization techniques, focusing on late gadolinium enhancement (LGE) and parametric T1/T2 mapping, across major NICM phenotypes including hypertrophic (HCM), dilated (DCM), and arrhythmogenic right ventricular cardiomyopathy (ARVC). LGE allows for the precise visualization of myocardial fibrosis, with replacement fibrosis in DCM showing a mid-wall pattern distinct from ischemic subendocardial scarring. In HCM, the extent of LGE (greater than or equal to 15% of total LV mass) is strongly linked to an increased risk of sudden cardiac death, providing a hazard ratio of 2.42 (95% CI: 1.50–3.92) across several pooled registries. Emerging T1 mapping methodologies provide non-invasive quantification of diffuse interstitial fibrosis, which precedes macrovascular scarring. Furthermore, T2-weighted imaging remains the gold standard for localized myocardial edema identification in suspected acute myocarditis. CMR provides unparalleled tissue characterization that significantly enhances diagnostic accuracy, guides therapeutic interventions, and improves risk stratification in non-ischemic cardiomyopathies, establishing it as a foundational pillar of modern personalized cardiovascular medicine.
Keywords: Cardiac magnetic resonance, Non-ischemic cardiomyopathy, Late gadolinium enhancement, Myocardial fibrosis, Hypertrophic cardiomyopathy, Risk stratification
Received: December 12, 2010; Revised: January 25, 2011; Accepted: February 14, 2011; Published: March 22, 2011
Citation: International Journal of Cardiology, 2011, Vol. 2, No. 3, pp. 17–24, DOI: 10.46882/2011/IJC/000024