Many myocardial diseases are associated with bundle branch block. The prognosis of bundle branch block reflects the underlying myocardial disease and is therefore variable. Mass electrocardiographic surveys indicate that many apparently healthy individuals have bundle branch block.

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• I. RIGHT BUNDLE BRANCH BLOCK
  The right bundle branch is the continuation of the penetrating AV bundle and runs as a single discrete bundle beneath the endocardium of the ventricular septum to the base of the anterior papillary muscle. The bundle then runs in the moderator band to form a rich anastomos¬ing network of conducting fibers throughout the right ventricle. The subepicardial location and discrete nature of the bundle branch of the rim of the right ventricular outflow makes it vulnerable to trauma from catheters. Because of its discrete nature, the bundle is easily damaged by several diseases including focal hypoplasia that causes congenital right bundle branch block, anteroseptal myo-cardial infarction that commonly affects the ventricular septum, and right ventricular hypertrophy associated with diffuse subendocardial fibrosis.
• II. LEFT BUNDLE BRANCH BLOCK
  Left bundle branch block (LBBB) is common after age 60 and is due to a block of the conduction in the bundle that receives impulses from the atrium and conducts the electrical current through the left ventricle (Fig. 1). The ECG is typical, and the physician makes the diagnosis only after looking at the ECG.
• BIBLIOGRAPHY
  Hiss, R. G., and Lamb, L. E. Electrocardiographic findings in 122,043