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Wolff-Parkinson-White (WPW) electrocardiographic (ECG) pattern. 1 The terminology WPW was first used to describe a “bundle-branch pattern” with a short PR interval in healthy young people prone to paroxysmal tachycardia and/or atrial fibrillation. Although isolated case reports preceded the 1930 landmark manuscript, history correctly credits identification of the syndrome to Drs. Wolff, Parkinson, and White. Over the years, the syndrome evolved through observations by anatomists and electrophysiologists to appreciate a reentrant circuit involving both the AV node–His axis as well as the accessory pathway. Isolated ventricular preexcitation refers to the abnormal ECG pattern in the absence of any clinical cardiovascular symptoms. Isolated