Body surface mapping using an ECG belt to characterize electrical heterogeneity for different left ventricular pacing sites during cardiac resynchronization: Relationship with acute hemodynamic improvement

Background Electrical heterogeneity (EH) during cardiac resynchronization therapy may vary with different left ventricular (LV) pacing sites. Objective The purpose of this study was to evaluate the relationship between such changes and acute hemodynamic response (AHR). Methods Two EH metrics—standard deviation of activation times and mean left thorax activation times—were computed from isochronal maps based on 53-electrode body surface mapping...