Heart muscles not receiving a sufficient supply
of oxygenated blood due vessel occlusions, heart attack, or inflammation
of the heart muscles. Other causes include hypertension, cardiomyopathies, congenital heart disease, and mechanical damage, as may occur during right-sided cardiac catheterization or with the placing of a pacing catheter in the right ventricle. RBBB can also result from fibrosis of the skeleton of the heart; this disorder is called Lev's disease".