title: Complete atrioventricular block, retrograde atrial activation and intra-atrial block.
abstract: A case of complete atrioventricular block, retrograde atrial activation, and intra-atrial block was reported. Inhomogeneous inhibition of the atrioventricular junction and the so-called summation of impulses may both act together to make retrograde conduction possible when third-degree atrioventricular block was present. In lead 2, P waves were dome-shaped, and in lead V1, P waves were biphasic; narrow and peaked P waves intermittently appeared, denoting third-degree intra-atrial block. The peaked P waves signified that the right atrium was activated while the left atrium was not depolarized.
authors.affiliation: Shanghai Sixth People's Hospital, China.
authors.forename: W C
authors.initials: WC
authors.lastname: Chen
authors.forename: Z R
authors.initials: ZR
authors.lastname: Zeng
authors.forename: J
authors.initials: J
authors.lastname: Yao
mesh_terms: D001283:Atrioventricular Node / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria; D006327:Heart Block / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged