Class IIa | RBBB with LAFB or LPFB (new or indeterminate) | |
---|---|---|
RBBB with 1st degree AV block | ||
LBBB (new or indeterminate) | ||
Recurrent sinus pauses (> 3 seconds) not responsive to atropine | ||
Incessant VT, for atrial or ventricular overdrive pacing (transvenous pacing required) | ||
Class IIb | Bifascicular block of indeterminate age | |
New or age indeterminate isolated RBBB |