Tachycardia mediated by an AV universal (DDD) pacemaker triggered by a ventricular depolarization.
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.
J
J
Pimenta
R
R
Soldá
C B
CB
Pereira
D000328:Adult; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000503:physiopathology*; D006327:Heart Block / Q000503:physiopathology / Q000628:therapy*; D006329:Heart Conduction System / Q000503:physiopathology; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D010138:Pacemaker, Artificial; D013610:Tachycardia / Q000503:physiopathology*