Abstract
This paper reports 4 cases of ventricular preexcitation (WPW) accompanied by left bundle branch block (LBBB). WPW appeared intermittently in all cases: Case 1 involved a right-sided accessory pathway, while Cases 2-4 involved left-sided accessory pathways. The electrocardiographic characteristics of both right-sided and left-sided accessory pathways coexisting with LBBB are discussed.