Cardiomyopathies/etiology; Magnetic Resonance Imaging; Myocardial Ischemia/complications; Myocardium/pathology; Ventricular Dysfunction, Left/etiology; Aged; Cardiomyopathies/mortality; Cardiomyopathies/pathology; Cardiomyopathies/physiopathology; Cardiomyopathies/therapy; Contrast Media; Female; Gadolinium DTPA; Heart Transplantation; Heart Ventricles/pathology; Heart Ventricles/physiopathology; Humans; Image Interpretation, Computer-Assisted; Kaplan-Meier Estimate; Male; Middle Aged; Myocardial Ischemia/mortality; Myocardial Ischemia/pathology; Myocardial Ischemia/physiopathology; Myocardial Ischemia/therapy; Predictive Value of Tests; Proportional Hazards Models; Risk Assessment; Risk Factors; Severity of Illness Index; Sex Factors; Stroke Volume; Systole; Time Factors; Treatment Outcome; Ventricular Dysfunction, Left/mortality; Ventricular Dysfunction, Left/pathology; Ventricular Dysfunction, Left/physiopathology; Ventricular Dysfunction, Left/therapy