The importance of septal activation in the electrogenesis of the unipolar morphologies in bundle branch block: Experimental study with total extirpation of the free ventricular wall of the blocked ventricle

Abstract Total extirpation of the blocked free ventricular wall in cases of bundle branch block does not modify the general morphology of the tracings and suggests a poor contribution of the wall in the determination of such morphologies. The forces across the interventricular septum in cases of bundle branch block are very important, and they give a satisfactory explanation of the unipolar morphologies.