الفهرس 
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Abstract
The Wolff-Parkinson-White (WPW) syndrome refers to an AV conduction through an accessory pathway resulting in earlier activation, or preexcitation, of the ventricles than if the impulse had traveled through the AV node. The significance of WPW syndrome comes from its association with different types of arrhythmias. Approximately 80% of patients with arrhythmia have atrioventricular reentrant tachycardia, 15 to 30% have atrial fibrillation, and 5% have atrial flutter and even maybe sudden cardiac death due to degeneration of AF with high ventricular rates into ventricular fibrillation. As a result of that comes the significance of the accurate localization of the accessory pathway in order to successfully ablate it by invasive electrophysiological study which is the gold standard method. Several methods had been used to predict the site of this AP like ECGs algorithms Aruda ,Fitzpatrick ,Xie and St George’s , echocardiographic modilities such as M-mode, Tissue doppler and 2D speckle tracking. In our study we aim to evaluate the role of 2D speckle tracking in precise localization of accessory pathway in comparison to electrophysiology study (EPS) as the gold standard technique.