<prompt> WPW syndrome is caused byBundle Branch BlockRight sided accessory pathwayEctopic pacemaker in atriumLeft budle Branch block  <response>: Ans. is b i.e., Right sided accessory pathway Anatomy Location ofAccessory pathway in W.R W syndrome Electrophysiological studies and mapping have shown that accessory. Atrioventricular pathways may be located anywhere along the A-V rign or groove in the septum. The most frequent locations are : - Left lateral 50, posteroseptal 30 right anteroseptal 10. Right lateral 10. Preexcitation resulting from left sided accessory is called type A preexcitation. Preexcitation resulting from right sided accessory pathway is called type B preexcitation. 