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No transmural action potential duration (APD)gradient case. A, B: High repolarization gradients (HRGs) within 1 cm around the scar (blue) for endocardial (A) and epicardial (B) pacing. Endocardial lead locations are shown by red circles and epicardial lead locations by black circles. Regions of interest are highlighted by yellow circles.C: HRG volume for endocardial (red) and epicardial (black) pacing at 0.2–3.5 cm from a scar. Dashed lines indicate a significant difference (P<.05).
