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Radiofrequency ablation of bundle branch reentrant tachycardia in a patient with atrial septal defect.

A 22-year-old woman with an atrial septal defect surgically corrected during childhood presented with a wide QRS complex tachycardia with left bundle branch block morphology. Electrophysiological study was performed and bundle branch reentrant tachycardia was induced with morphology identical to clinical tachycardia. Radiofrequency catheter ablation of the right bundle branch was successful, resulting in complete right bundle branch block and cure of her ventricular arrhythmia.