Management of Right Bundle Branch Block

Initial Evaluation

A comprehensive clinical assessment is necessary to determine if the patient is symptomatic or asymptomatic, according to the American Heart Association 1
A 12-lead ECG is required to confirm RBBB diagnosis and look for additional conduction abnormalities, as recommended by the American College of Cardiology 1, 2
Transthoracic echocardiography is reasonable to assess for structural heart disease, particularly if the patient is symptomatic, according to the American College of Cardiology 2
Laboratory testing based on clinical suspicion is necessary to identify potential underlying causes, as recommended by the American College of Cardiology 2

Asymptomatic isolated RBBB with normal PR interval and 1:1 AV conduction typically requires no specific treatment beyond observation, according to the American College of Cardiology 2
RBBB with left anterior or posterior fascicular block requires monitoring and further evaluation, as recommended by the American College of Cardiology 2
RBBB with syncope and HV interval ≥70 ms or evidence of infranodal block at electrophysiology study is considered high risk and may require permanent pacing, according to the American College of Cardiology 2

Ambulatory ECG monitoring (24-hour to 14-day) is necessary to detect potential intermittent AV block in symptomatic patients, as recommended by the American Heart Association and the American College of Cardiology 1, 2
Exercise testing is reasonable if symptoms are exercise-related or to assess chronotropic competence, according to the American Heart Association 1
Electrophysiology study (EPS) is reasonable in patients with syncope and RBBB to assess for HV interval prolongation or infranodal block, as recommended by the American College of Cardiology 2
Advanced cardiac imaging (cardiac MRI, CT) is necessary if structural heart disease is suspected but not evident on echocardiography, according to the American College of Cardiology 2

In tetralogy of Fallot patients, RBBB is common after repair and requires special attention, as recommended by the American Heart Association 3
In Ebstein's anomaly, RBBB may coexist with accessory pathways, requiring careful evaluation, according to the American Heart Association 3

No specific treatment is indicated for asymptomatic patients with isolated RBBB and 1:1 AV conduction, according to the American College of Cardiology 2
Permanent pacing is recommended for patients with syncope and RBBB who have HV interval ≥70 ms or infranodal block on EPS, as well as for patients with alternating bundle branch block or Kearns-Sayre syndrome and conduction disorders, according to the American College of Cardiology 2

Misdiagnosing ventricular tachycardia as SVT with RBBB aberrancy, especially in patients with structural heart disease, is a common pitfall, as warned by the American Heart Association 3
Unnecessary permanent pacing in asymptomatic patients with isolated RBBB is not indicated and may cause harm, according to the American College of Cardiology 2