title: [Concealed His bundle extrasystoles causing atrioventricular block].
abstract: We present electrocardiograms of a 37 year-old male with frequent extrasystoles and second-degree atrioventricular block. Electrophysiological study confirmed the initial diagnosis of manifest and concealed His bundle ectopy as the cause of his brady- and tachyarrhythmia.
authors.affiliation: I Klinika Kardiologii i Elektrokardiologii Interwencyjnej oraz Nadciśnienia Tętniczego, Szpital Uniwersytecki, Kraków. mcjastrz@cyf-kr.edu.pl
authors.forename: Marek
authors.initials: M
authors.lastname: Jastrzębski
authors.forename: Tomasz
authors.initials: T
authors.lastname: Sondej
authors.forename: Piotr
authors.initials: P
authors.lastname: Kukla
mesh_terms: D000328:Adult; D054537:Atrioventricular Block / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D002036:Bundle of His / Q000002:abnormalities* / Q000503:physiopathology; D005117:Cardiac Complexes, Premature / Q000150:complications* / Q000175:diagnosis* / Q000503:physiopathology; D004562:Electrocardiography; D006801:Humans; D008297:Male