Abstract 3095: Prognostic Significance Of Post-revascularisation Irreversible Myocardial Injury Detected By Cardiovascular Magnetic Resonance Imaging
Background The prognostic significance of revascularization procedure related myocardial injury is uncertain. Delayed enhancement CMR (DE-CMR) has been shown to reliably identify areas of irreversible myocardial injury. We evaluated the prognostic significance of procedure related myocardial injury in a consecutive series of patients undergoing high risk PCI or CABG.
Methods/Results 152 patients underwent DE-CMR pre and 1– 6 days post elective PCI or CABG. Primary endpoint was defined as total mortality, non-fatal MI, ventricular arrhythmia terminated by ICD (VA), and unstable angina or heart failure requiring hospitalization. Secondary endpoint was the composite of total mortality, non-fatal MI and VA. During a median follow-up of 2.9 years, 27 patients (18%) reached the primary endpoint and 12 patients (8%) the secondary endpoint. 49 patients (32%) had evidence of new myocardial hyperenhancement (HE) with a median mass of 5.0g (IQR 4.8 –7.1). In a univariate analysis, age, LV EF post intervention, and presence of new HE were predictive of the primary outcome. Elevated troponin (at 24 h) showed a trend towards poorer outcome. In a multivariate Cox regression analysis only age and presence of new HE (HR 2.7, 95% CI 1.1, 5.8) remained independently correlated with occurrence of the primary endpoint. New myocardial HE was the single independent predictor of the composite secondary endpoint (HR 4.2 95% CI 1.2, 16.1).
Conclusion Even small amounts of procedure-related myocardial injury are associated with poorer medium term clinical outcomes. CMR identified myocardial injury may be a stronger prognostic marker than cardiac troponin in the setting of coronary revascularisation.