Differential diagnosis of tachycardia with a typical left bundle branch block morphology

Figure 4 Typical action potential from within the His-Purkinje system. If this potential was from the left bundle branch, impulses that occur (encroach upon) the absolute refractory period will not excite the tissue. A new action potential will not occur and (assuming it is not also refractory) conduction will occur solely through the right bundle branch. Adapted from[11], with permission.