title: Electrocardiographic, electrophysiologic, and anatomical features of ventricular tachycardia originating from noncoronary cusp.
abstract: In this article, we report 2 young patients (a 15-year-old adolescent girl and a 25-year-old man) with drug-refractory palpitations. Admission electrocardiograms showed runs of ventricular tachycardia with left bundle-branch block morphology, left inferior axis, early precordial QRS transition, and positive QRS complex in lead I. In right ventricular mapping, the earliest activation site was found in the His bundle region. Aortic root mapping showed a very early fractionated ventricular signal with large atrial potential and no His potential in the noncoronary cusp region. Radiofrequency energy application in this region resulted in tachycardia termination within 5 to 10 seconds. During a 3- to 6-month follow-up period, the patients remained asymptomatic, and the electrocardiogram showed no ventricular arrhythmias.
authors.affiliation: Cardiac Electrophysiology Research Center, Rajaie Cardiovascular Medical and Research Center, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Sima
authors.initials: S
authors.lastname: Sayah
authors.forename: Shahab
authors.initials: S
authors.lastname: Shahrzad
authors.forename: Mehdi
authors.initials: M
authors.lastname: Moradi
authors.forename: Majid
authors.initials: M
authors.lastname: Haghjoo
mesh_terms: D000293:Adolescent; D000328:Adult; D002037:Bundle-Branch Block / Q000503:physiopathology* / Q000601:surgery*; D017115:Catheter Ablation; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D006801:Humans; D008297:Male; D017180:Tachycardia, Ventricular / Q000503:physiopathology* / Q000601:surgery*