Abstract 17286: Reconciling Systolic and Diastolic Measures of Left Ventricular Noncompaction Cardiomyopathy in Cardiac Magnetic Resonance

Background: Previously, it was demonstrated that systolic measures identify higher levels of risk for events related to left ventricular noncompaction cardiomyopathy (LVNC) than diastolic measures. This analysis seeks to improve the ability of the diastolic measures to identify LVNC and predict associated events. Methods: Trabeculation/possible LVNC by cMRI was retrospectively observed among 122 consecutive cases. We assessed the extent of trabeculation, end-systolic noncompacted-to-compacted ratios (ESNCCR), end-diastolic noncompacted-to-compacted ratios (EDNCCR) along with myocardial thickening (MT) and ejection fraction (EF). Deaths, CHF readmissions, ventricular arrhythmias, and embolic events were pooled to increase statistical power and used to identify potential LVNC-associated events. Using logistic regression with an ESNCCR ≥ 2 to identify LVNC as the dependent variable and EDNCCR as the independent variable, analysis were performed with receiver operating curves with and without myocardial thickening as a covariate. Next, using pooled LVNC-associated events as the dependent variable, separate models were performed for ESNCCR ≥ 2 and EDNCCR ≥ 2.3, both adjusting for age, race, gender, body surface area, left ventricular ejection fraction, number of trabeculated segments, and myocardial thickening. Results: The area under the curve (AUC) for EDNCCR to identify potential LVNC was 0.84, but with adjustment for myocardial thickening, the AUC was 0.98, which was significantly increased (p-value = 0.005). Without adjusting for myocardial thickening, ESNCCR ≥ 2 was associated with LVNC-associated events, but EDNCCR ≥ 2.3 was not (p-value: 0.003 vs 0.2, respectively). With adjustment for myocardial thickening, both ESNCCR ≥ 2 and EDNCCR ≥ 2.3 were associated with LVNC-associated events (p-value: 0.03 vs 0.03, respectively). Conclusion: In using the diastolic measure to assess for possible left ventricular noncompaction cardiomyopathy, impaired function of the underlying compacted layer is important in identifying those with a higher risk of subsequent events. Further studies are needed to determine if individuals with increased trabeculations with preserved myocardial thickening are at increased risk of future events.