<prompt> WPW syndrome is caused by:Bundle Branch BlockRight sided accessory pathwayEctopic pacemaker in atriumLeft bundle Branch block  <response>: Answer is B Right sided accessory pathway Wolf Parkinson White syndrome is caused by the presence of on additional accessory pathway connection between the atria and ventricle. The acessary pathway called bundle of Kent may be present as a connection between the left atrium and left ventricle Left sided or as a connection between the right atrium and right ventricle Right sided. Pre excitation resulting from left sided accessory pathways is called Type A Pre-excitation Pre excitation resulting from right sided accessory pathway is called Type B Pre-excitation The most common accessary pathways leading to pre-excitation syndromes WPW are left sided connecting left atrium to left ventricle. 