Heart HQ - Episode 21: Right Bundle Branch Block is when the normal electrical conduction activity in the heart is interrupted to the right ventricle. It can be diagnosed by the characteristic pattern it has on an ECG.
Mixed pattern of RBBB in precordial leads and LBBB in limb leads, with a higher rate of progression to complete heart block than typical bifascicular block
Right Bundle Branch Block (RBBB) activation of the right ventricle is delayed as depolarisation spreads across septum from left ventricle.
Bifascicular block is the combination of RBBB with either LAFB or LPFB. Conduction to the ventricles is via the single remaining fascicle.