Clark BA, Prystowsky EN. Electrocardiography of Atrioventricular Block.
Cardiol Clin 2023;
41:307-313. [PMID:
37321683 DOI:
10.1016/j.ccl.2023.03.007]
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Abstract
Delayed atrioventricular (AV) conduction most commonly occurs in the AV node, resulting from AH prolongation on an intracardiac electrocardiogram and PR prolongation on a surface electrocardiogram. AV conduction may be blocked in a 2:1 manner, with a normal PR interval and wide QRS suggesting infranodal disease, whereas a prolonged PR interval and narrow QRS are more suggestive of AV nodal disease. Block within the His is suspected when there is 2:1 AV block with normal PR and QRS intervals. Complete heart block occurs when the atrial rhythm is totally independent of a junctional or lower escape rhythm.
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