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First-degree atrioventricular block
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First-degree atrioventricular block

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Contributors: Ryan Hoefen MD, PhD
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Synopsis

Cardiac electrical conduction abnormality characterized by prolonged conduction time from the sinus node to the ventricles, which is electrocardiographically identified by a long PR interval, generally greater than 200 msec. Can occur with normal QRS duration or wide QRS complex. Associated with many diseases, including congenital heart disease, myocardial infarction, angina pectoris, rheumatic fever, Hodgkin lymphoma, systemic lupus erythematosus, cardiomyopathy, coronary artery disease, Lyme disease, melanoma, sarcoidosis, and bacterial endocarditis. Findings include sinus bradycardia, syncope, presyncope, diastolic murmur, and bradyarrhythmia.

Related topics: Second-Degree Atrioventricular Block, Complete Atrioventricular Block

Codes

ICD10CM:
I44.0 – Atrioventricular Block, First-Degree

SNOMEDCT:
270492004 – First degree atrioventricular block

Differential Diagnosis & Pitfalls

Best Tests

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Drug Reaction Data

Below is a list of drugs with literature evidence indicating an adverse association with this diagnosis. The list is continually updated through ongoing research and new medication approvals. Click on Citations to sort by number of citations or click on Medication to sort the medications alphabetically.

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References

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Last Updated: 10/28/2016
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First-degree atrioventricular block
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First-degree atrioventricular block : Bradyarrhythmia, PR interval prolonged, Sinus bradycardia
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