Clinical and electrophysiological characteristics of patients with paroxysmal intra-His block with narrow QRS complexes

Atrioventricular (AV) block is usually due to infranodal disease and associated with a wide QRS complex; such patients often progress to complete AV block and pacemaker dependency. Uncommonly, infranodal AV block can occur within the His bundle with a narrow QRS complex.
Source: Heart Rhythm - Category: Cardiology Authors: Source Type: research
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