A cardiac conduction disorder characterized by an electrocardiographic finding of ventricular pre-excitation, which is a short PR interval and a long QRS interval with a delta wave. Most individuals are asymptomatic; however they can experience periods of palpitations, shortness of breath or syncope during tachycardic episodes. The disease is Wolff-Parkinson-White syndrome (MONDO_0008685). Also known as: WPW, Wolff-Parkinson-White pattern, Wolff-Parkinson-White pattern (finding), Wolff-Parkinson-white syndrome (disease), anomalous A-V excitation, anomalous atrioventricular excitation, ventricular familial preexcitation syndrome.