title: Unusual Wenckebach upper rate response of an atrial-based DDD pacemaker.
abstract: We describe in this report an unusual form of Wenckebach upper rate response produced by a DDD pulse generator with atrial-based lower rate timing. The pacemaker maintained the programmed upper and lower rate intervals at the expense of a prolonged atrial paced-ventricular paced AV interval. This form of upper rate behavior eliminated the longer cycle (containing the unsensed P wave) that occurs at the end of the pacemaker Wenckebach sequence during traditional DDD pacing with ventricular-based lower rate timing.
authors.affiliation: St. Louis University Medical Center, Division of Cardiology, MO 63110-0250.
authors.forename: C S
authors.initials: CS
authors.lastname: Fredman
authors.forename: P
authors.initials: P
authors.lastname: Bjerregaard
authors.forename: D L
authors.initials: DL
authors.lastname: Janosik
authors.forename: S S
authors.initials: SS
authors.lastname: Barold
mesh_terms: D000328:Adult; D002304:Cardiac Pacing, Artificial / Q000379:methods*; D004562:Electrocardiography; D004867:Equipment Design; D005260:Female; D006325:Heart Atria; D006327:Heart Block / Q000150:complications / Q000628:therapy*; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000150:complications; D010138:Pacemaker, Artificial; D013616:Tachycardia, Sinus / Q000150:complications / Q000628:therapy