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  • Title: Unusual Wenckebach upper rate response of an atrial-based DDD pacemaker.
    Author: Fredman CS, Bjerregaard P, Janosik DL, Barold SS.
    Journal: Pacing Clin Electrophysiol; 1992 Jul; 15(7):975-8. PubMed ID: 1378607.
    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.
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