title: [Blocked atrial extrasystole simulating impaired anterograde conduction during atrial stimulation].
abstract: In a 72-years-old patient with intermittent bradycardia definitive atrial pacing was considered. Surface ECG was misleading because of demonstrating 2:1 anterograde block during atrial stimulation at a rate of 100 beats per minute. Intracardiac recordings disclosed the bigeminal occurrence of premature atrial contractions. Every second stimuli fall within the premature atrial contraction's refractory period simulating impaired AV-conduction. Our report emphasizes the importance of intracardiac recordings during atrial stimulation in order to evaluate the anterograde conduction before pacemaker implantation.
authors.affiliation: Allami Kórház, Balatonfüred.
authors.forename: G
authors.initials: G
authors.lastname: Veress
mesh_terms: D000368:Aged; D001146:Arrhythmia, Sinus / Q000175:diagnosis / Q000628:therapy; D016275:Atrial Function; D001919:Bradycardia / Q000175:diagnosis* / Q000628:therapy; D005117:Cardiac Complexes, Premature / Q000175:diagnosis* / Q000628:therapy; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D006327:Heart Block / Q000175:diagnosis* / Q000628:therapy; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male