title: Cardiomyopathy induced by incessant fascicular ventricular tachycardia.
abstract: A 12-year-old girl with symptoms of fatigue, decreased exercise tolerance and progressive dyspnea (New York Heart Association functional class III) with a possible diagnosis of dilated cardiomyopathy secondary to viral myocarditis. Because of incessant wide QRS tachycardia refractory to antiarrhythmic drugs, she was referred for electrophysiological study. The diagnosis was idiopathic left ventricular tachycardia involving the posterior fascicle of the left bundle branch. After successful treatment with radiofrequency catheter ablation guided by a Purkinje potential radiological and echocardiographic evaluation showed complete reversal of left ventricular function in the first 3 months and no recurrence of arrhythmia during 2 years of follow up.
authors.affiliation: Unidad de Electrofisiología, División de Cardiología, Hospital de Cardiología, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, México, DF, Mexico; Curso de Posgrado de Alta Especialidad en Electrofisiología Cardiaca, Facultad de Medicina, Universidad Nacional Autónoma de México, México, DF, Mexico. Electronic address: enve@prodigy.net.mx.
authors.forename: Enrique
authors.initials: E
authors.lastname: Velázquez-Rodríguez
authors.forename: Horacio
authors.initials: H
authors.lastname: Rodríguez-Piña
authors.forename: Alex
authors.initials: A
authors.lastname: Pacheco-Bouthillier
authors.forename: Luz María
authors.initials: LM
authors.lastname: Deras-Mejía
mesh_terms: D002311:Cardiomyopathy, Dilated / Q000209:etiology*; D002648:Child; D005260:Female; D006801:Humans; D017180:Tachycardia, Ventricular / Q000150:complications*
keywords: Fascicular ventricular tachycardia; Idiopathic left ventricular tachycardia; Mexico; Miocardiopatía mediada por taquicardia; México; Tachycardia-mediated cardiomyopathy; Taquicardia ventricular fascicular; Taquicardia ventricular izquierda idiopática; Taquicardia ventricular sensible a verapamil; Verapamil-sensitive ventricular tachycardia