Argentine National Cardiac Magnetic Resonance Imaging Registry (RENAREC)

The usefulness of cardiac magnetic resonance imaging (MRI) has greatly increased in the last years. Different international registries have been published on its use; however, there is no data available from Argentina. Objective: The aim of this study was to evaluate different indications, protocols, safety and therapeutic consequences of cardiac MRI in Argentina. Methods: A prospective national registry was designed with collection of demographic data, indications for cardiac MRI, associated complications, diagnoses and therapeutic consequences. Results: A total of 34 centers from 10 provinces of Argentina (85% private and 59% with inpatient capacity) participated in the study, including 1131 patients (mean age 5418 years and 61% males). The main indications for cardiac MRI were hypertrophic cardiomyopathy (13.9%), and ventricular arrhythmia (12.3%). In 99.7% of cases, no study complications were reported. The most frequent results of cardiac MRI were: normal (31.2%), non-ischemic cardiomyopathy (14.7%), ischemic-necrotic cardiomyopathy (11.6%) and hypertrophic cardiomyopathy (8.9%). Clinical suspicion was confirmed in 23.6% of cases and cardiac MRI generated an unsuspected new diagnosis in 48.7% of cases. The main therapeutic consequences were hospital discharge (31.6%) followed by change in medication (28.1%). Conclusions: Cardiac MRI is widely used in Argentina, mainly in private centers with a very low incidence of complications. Cardiomyopathies (hypertrophic and dilated) and ventricular arrhythmia are its main indication, and it provides a new unsuspected diagnosis in almost half of the cases. Further studies are required to assess its clinical and therapeutic impact.