Page 472 - ECG dr shamol_Slide

Patient with WPW have a tract that bypasses AV node which is known as

Kent bundle. In this condition, when impulse travels down through the atria
it reaches the Kent bundle and AV node simultaneously. The impulse travels

down the AV node and is met by normal physiological block. The impulse

also travels down the Kent bundle, does not meet any block and so begins to

spread through the ventricular myocardium. This progression is slow and gives
a wide pattern on the ECG.