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  • Title: Tachycardia mediated by an AV universal (DDD) pacemaker triggered by a ventricular depolarization.
    Author: Pimenta J, Soldá R, Pereira CB.
    Journal: Pacing Clin Electrophysiol; 1986 Jan; 9(1 Pt 1):105-7. PubMed ID: 2419839.
    Abstract:
    A 44-year-old female had Chagas' disease with right bundle branch block, right axis deviation, and ventricular ectopic beats. An invasive evaluation showed a prolonged HV interval of 100 ms. A Medtronic Versatrax 7000 was implanted, after which a pacemaker-mediated tachycardia was observed. The esophageal lead ruled out the possibility of an atrial triggered tachycardia. The diagnosis was pacemaker-mediated tachycardia due to abnormal sensing of the terminal forces of the ventricular activation because of malposition of the atrial lead in the right ventricular out-flow tract.
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