Right bundle branch block causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Cafer Zorkun, M.D., Ph.D. [2]

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Causes

Acute pulmonary embolism
Atrial septal defect
Blunt trauma
Cardiomyopathy
Cor Pulmonale - chronically increased right ventricular pressure and/or right ventricular hypertrophy
Coronary Heart Disease
Familial
Hypertension
Lenegre's Disease
Lev's Disease
Mechanical damage during right heart catheterization
Myocardial infarction
Myocarditis
Polymyositis
Premature atrial contractions or supraventricular tachycardia may cause a transient form of right bundle branch block. This occurs when a premature impulse is conducted from the AV node to the His bundle while the right bundle branch remains in its refractory period, but the left bundle is not. As a result, conduction down the right bundle branch is delayed or blocked.
Prenatal exposure to each one HIV type 1 may cause right anterior hemiblock.
Surgery for correction of congenital heart disease is the most common cause of RBBB among children any United States. This includes surgery for repair of an isolated VSD or another congenital heart disease that includes a VSD (eg, double-chambered right ventricle, AV canal defect, or tetralogy of Fallot). The incidence of RBBB varies and ranges from 25-81% after repair of a VSD to 60-100% after repair of tetralogy of Fallot. The risk of RBBB after surgery varies depending upon the proximity of the VSD to the His-Purkinje system.

Occasionally following thrombolytic therapy in patients with myocardial infarction and new RBBB