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A: Ventricular preexcitation and a right bundle branch block were found in a 14-year-old girl who carries a de novo loss-of-function mutation of TBX3. The electrocardiogram (ECG) shown was her first. B: Preexcitation is no longer present after transcatheter ablation of a left-sided accessory pathway. The right bundle branch block remains. This ECG pattern has remained the same after 3 years of follow-up.
