[2] The European Society of Cardiology (ESC) suggests using electrophysiology studies to look into it (EPS).

When pharmacologic stress or incremental atrial pacing induces high-degree atrioventricular block, a permanent pacemaker (PPM) is recommended.

If EPS is negative, long-term rhythm monitoring with an implantable loop recorder (ILR) is advised.

[4] Patients who suffer from bifascicular block are more likely to experience syncope and unexpected death.

[5] In those with bifascicular block and no symptoms, little with respect to treatment is needed.