title: Multiple arrhythmogenic substrate for tachycardia in a patient with frequent palpitations.
abstract: We report a 26-year-old woman with frequent episodes of palpitation and dizziness. Resting electrocardiography showed no evidence of ventricular preexcitation. During electrophysiologic study, a concealed right posteroseptal accessory pathway was detected and orthodromic atrioventricular reentrant tachycardia incorporating this pathway as a retrograde limb was reproducibly induced. After successful ablation of right posteroseptal accessory pathway, another tachycardia was induced using a concealed right posterolateral accessory pathway in tachycardia circuit. After loss of retrograde conduction of second accessory pathway with radiofrequency ablation, dual atrioventricular nodal physiology was detected and typical atrioventricular nodal reentrant tachycardia was repeatedly induced. Slow pathway ablation was done successfully. Finally sustained self-terminating atrial tachycardia was induced under isoproterenol infusion but no attempt was made for ablation. During 8-month follow-up, no recurrence of symptoms attributable to tachycardia was observed.
authors.affiliation: Department of Pacemaker and Electrophysiology, Shahid Rajaie Cardiovascular Center, School of Medicine, Iran University of Medical Sciences, Tehran, Iran. haghjoo@rhc.ac.ir
authors.forename: Majid
authors.initials: M
authors.lastname: Haghjoo
authors.forename: Arash
authors.initials: A
authors.lastname: Arya
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Dehghani
authors.forename: Zahra
authors.initials: Z
authors.lastname: Emkanjoo
authors.forename: Amirfarjam
authors.initials: A
authors.lastname: Fazelifar
authors.forename: Mohammadali
authors.initials: M
authors.lastname: Sadr-Ameli