title: Permanent right bundle-branch block heralded by intermittent block and ventricular extrasystoles. A 13-year observation.
abstract: A patient is described in whom the occurrence of frequent ventricular extrasystoles of right ventricular origin and intermittent right bundle-branch block caused by interpolation of these extrasystoles heralded the slow development of permanent right bundle-branch block over a period of observation of 13 years. Such a clinical course suggested gradual progression of an organic lesion in the intraventricular conducting system. The differential diagnosis of intermittent bundle-branch block and aberrant intraventricular conduction, and possible mechanisms of ectopic impulse formation in the presence of bundle-branch block are discussed.
mesh_terms: D000368:Aged; D002037:Bundle-Branch Block / Q000175:diagnosis / Q000209:etiology*; D005117:Cardiac Complexes, Premature / Q000150:complications* / Q000175:diagnosis; D003326:Coronary Circulation; D003937:Diagnosis, Differential; D004562:Electrocardiography; D006801:Humans; D008297:Male