Stephen J. Schueler, M.D.

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First Degree Heart Block Evaluation

Most often, a first degree heart block is discovered on an electrocardiogram taken for another reason. A person is said to have a first degree heart block when the measurement of the P-R interval on the EKG is slightly prolonged. In first degree heart block the PR interval is longer than 0.20 seconds. This can be measured directly off the EKG.

There are usually no findings on physical examination in a person with first degree heart block.

A healthy person with a first degree heart block rarely requires a cardiac evaluation. Those with cardiac symptoms, a history of heart disease, thyroid problems, or diabetes may require further testing.

Tests that may be used to evaluate first degree heart block include:

Continue to First Degree Heart Block Treatment

Last Updated: Dec 13, 2010 References
Authors: Stephen J. Schueler, MD; John H. Beckett, MD; D. Scott Gettings, MD
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PubMed First Degree Heart Block References
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  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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