Final answer:
WPW syndrome's ECG findings include a delta wave, short PR interval, and broadened QRS complex, which indicate ventricular preexcitation.
Step-by-step explanation:
Wolff-Parkinson-White (WPW) syndrome is characterized by an atrioventricular accessory pathway that leads to ventricular preexcitation, bypassing the normal conduction through the AV node. This results in specific findings on an electrocardiogram (ECG). The hallmark sign of WPW on an ECG is the presence of a delta wave, which is a slurred upstroke in the QRS complex that represents early depolarization of the ventricles. Alongside the delta wave, a short PR interval and a broadened QRS complex may also be observed. These ECG abnormalities distinguish WPW from other types of cardiac arrhythmias or conduction abnormalities such as AV blocks or atrial fibrillation.