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Prolongation of Activation‐Recovery Interval over a Preexcited Region before and after Catheter Ablation in Patients with Wolff‐Parkinson‐White Syndrome

Activation‐Recovery Interval in WPW Syndrome. Introduction: Preexisting changes in repolarization properties play an important role in T wave abnormalities (cardiac memory) after ablation in patients with Wolff‐Parkinson‐White (WPW) syndrome. However, no report has provided direct evidence for prolongation of action potential duration (APD) over a preexcited region before and after ablation.