Stephen J. Schueler, M.D.

Overview Symptoms Evaluation Treatment specialist Home Care warning signs Underlying Cause Anatomy

Heart Block First Degree Underlying Cause

An electrical impulse stimulates the muscle fibers in the heart to contract. The impulse spreads through the heart in a very organized manner, so that the atria contract first, followed by the ventricles.

In first degree heart block, the electrical impulse pauses slightly longer than normal.

Causes for first degree heart block include:

Continue to Heart Block First Degree Anatomy

Last Updated: Feb 1, 2011 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed Heart Block First Degree References
  1. Bevilacqua LM, Berul CI. Advances in pediatric electrophysiology. Curr Opin Pediatr. 2004 Oct;16(5):494-9. [15367841]
  2. Delisle BP, Anson BD, Rajamani S, January CT. Biology of cardiac arrhythmias: ion channel protein trafficking. Circ Res. 2004 Jun 11;94(11):1418-28. [15192037]
  3. Liautaud S, Khan AJ, Nalamasu SR, Tan IJ, Onwuanyi AE. Variable atrioventricular block in systemic lupus erythematosus. Clin Rheumatol. 2005 Apr;24(2):162-5. [15517446]
  4. Nagi KS, Joshi R, Thakur RK. Cardiac manifestations of Lyme disease: a review. Can J Cardiol. 1996 May;12(5):503-6. [8640597]
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