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Representative ECGs and changes of LV septal (SEP) and lateral (LTR) strain from control (A), 6-week paced DHF (B), and CRT (C) dogs. ECGs from DHF and CRT dogs are shown during pacing, and control is shown during sinus rhythm. Biventricular pacing synchronized the strain patterns between LV septal and lateral walls and abbreviated the DHF-induced prolongation of QRS duration.
