Abstract 20577: Combination of Global Longitudinal Strain and Sympathetic Nervous Dysfunction Predicts Cardiac Events in Patients With Non-Ischemic Dilated Cardiomyopathy
Introduction: It has been reported that sympathetic nervous dysfunction by 123I-metaiodobenzylguanidine (MIBG) is associated with worse outcome in dilated cardiomyopathy (DCM) patients. However, the association between sympathetic nervous function and myocardial strain is not established.
Hypothesis: Global longitudinal strain (GLS) by two-dimensional speckle-tracking echocardiography (2DSTE) is correlated with sympathetic nervous activity, and stratifies DCM patients at risk for cardiac events with a combination of sympathetic nervous activity.
Methods: We studied 71 patients who had admitted to a cardiology department with heart failure at the initial visit (age 61±13 years, 45 males, LV ejection fraction (EF) 30±8 %). All patients underwent MIBG imaging for the delayed heart to mediastinum ratio (H/M), and echocardiography with conventional assessment including left atrial volume (LAV), LV end-diastolic and end-systolic volume (LVEDV, LVESV), LVEF, mitral regurgitation grade (MR), early transmitral flow to atrial contraction (E/A) and with 2DSTE analysis for GLS expressed with an absolute value. Cardiac events were assessed according to death and hospitalization with heart failure.
Results: There were 21 cardiac events in the follow-up period for 4.9±2.3 years. Univariate regression analysis showed LAV, LVEDV, LVESV, LVEF, MR, E/A and GLS had a significant correlation with delayed H/M (all p < 0.05). Multivariate regression analysis revealed that GLS was an independent predictor of delayed H/M. Dividing all patients into 4 groups by the median of GLS in patients with delayed H/M >1.6 or≤1.6, the combination of the worse delayed H/M and the worse GLS was significantly associated with cardiac events (p=0.03).
Conclusions: Left ventricular GLS is significantly correlated with delayed H/M and can be useful to stratify the risk in DCM patients with a combination of delayed H/M.
Author Disclosures: M. Chimura: None. T. Onishi: None. H. Kawai: None. S. Yamada: None. Y. Yasaka: None.
This research has received full or partial funding support from the American Heart Association.
- © 2014 by American Heart Association, Inc.