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Updated: Jun 23, 2026

Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing

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Prognosis in bundle branch block

J McAnulty, S Rahimtoola

Annual Review of Medicine

|January 1, 1981

Summary

This summary is machine-generated.

Chronic bundle branch block (BBBC) in asymptomatic patients requires no intervention. Symptomatic patients with bradyarrhythmia may benefit from a permanent pacemaker if complete heart block is confirmed.

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Area of Science:

Cardiology
Electrophysiology

Background:

Chronic bundle branch block (BBBC) is a prevalent condition.
BBBC often indicates underlying heart disease.

Purpose of the Study:

To outline diagnostic and treatment strategies for patients with chronic bundle branch block.
To clarify the role of permanent pacemakers in managing symptomatic versus asymptomatic individuals.

Main Methods:

Review of clinical guidelines and evidence regarding chronic bundle branch block management.
Analysis of patient outcomes based on symptom presentation and documented arrhythmias.

Main Results:

Asymptomatic patients with BBBC do not require diagnostic studies or treatment.
Symptomatic patients require evaluation for bradyarrhythmia; permanent pacemaker insertion is indicated if complete heart block is documented.
Pacemaker insertion in symptomatic patients without documented arrhythmia did not demonstrate benefit in symptom prevention or survival.

Conclusions:

Management of chronic bundle branch block should be stratified based on symptomology and electrophysiological findings.
Permanent pacemaker implantation is reserved for symptomatic patients with documented complete heart block.
Clinical surveillance is recommended for symptomatic patients without documented arrhythmias.