Stephen J. Schueler, M.D.

Overview Symptoms Evaluation EP studies Treatment pacemaker specialist Home Care diet pulse checks taking control warning signs Underlying Cause complete block left anterior hemiblock left posterior hemiblock Types Anatomy

Left Bundle Branch Block Overview

What is a left bundle branch block?
A person with a left bundle branch block has an abnormality in the electrical impulse that stimulates the muscle fibers in the heart to contract. A left bundle branch block may cause the heart to beat abnormally. This abnormal impulse is discovered on an electrocardiogram, but does not usually cause symptoms. A left bundle branch block is caused by any illness that damages the heart. The most common causes of left bundle branch block include congestive heart failure or coronary artery disease.

What are the symptoms of a left bundle branch block?
Usually, a left bundle branch block does not cause symptoms. Rare symptoms of a left bundle branch block include palpitations, fatigue, faintness, fainting, and shortness of breath during activity.

How does the doctor treat a left bundle branch block?
Treatment for a left bundle branch block depends on the underlying cause. Treatment for left bundle branch block may include medications or cardiac pacemaker.

Continue to Left Bundle Branch Block Symptoms

Last Updated: Nov 2, 2010 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Left Bundle Branch Block References
  1. Guerrero M, Harjai K, Stone GW, Brodie B, Cox D, Boura J, Grines L, O'Neill W, Grines C. Comparison of the prognostic effect of left versus right versus no bundle branch block on presenting electrocardiogram in acute myocardial infarction patients treated with primary angioplasty in the primary angioplasty in myocardial infarction trials. Am J Cardiol. 2005 Aug 15;96(4):482-8. [16098297]
  2. Lee SJ, McCulloch C, Mangat I, Foster E, De Marco T, Saxon LA. Isolated bundle branch block and left ventricular dysfunction. J Card Fail. 2003 Apr;9(2):87-92. [12751128]
  3. Nguyen K, Cigarroa JE, Lange RA, Hillis LD, Keeley EC. Presence and extent of angiographic coronary narrowing in patients with left bundle branch block. Am J Cardiol. 2004 Jun 1;93(11):1426-7, A10. [15165932]
  4. Reuben AD, Mann CJ. Simplifying thrombolysis decisions in patients with left bundle branch block. Emerg Med J. 2005 Sep;22(9):617-20. [16113178]
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