The Primary Alteration of Ventricular Myocardium Conduction: The Significant Determinant of Left Bundle Branch Block Pattern

Figure 2

In the intraventricular conduction disturbances the activation of the whole ventricle or its part is delayed. In the generalized intraventricular block the delay can be caused by: (1) The delayed onset of activation due to blocks in H-P system; (2) slowed activation propagation in the pathologically changed ventricular myocardium; (3) combination of both causes. In the regional intraventricular block the delay can be caused by: (1) The delayed onset of activation in particular ventricular area due to blocks in fascicles, (2) slowed activation propagation in the particular ventricular region due to locally pathologically changed myocardium, (3) combination of both causes. BBB: bundle branch blocks, FB: fascicular blocks.