title: Radiofrequency catheter ablation of an orthodromic tachycardia in a patient with single ventricle.
abstract: Radiofrequency catheter ablation of a recurrent orthodromic tachycardia was performed in a 10-year-old child with single ventricle and bidirectional Glenn procedure before a Fontan operation. Identification of a His bundle electrogram was achieved at the postero-inferior atrioventricular (AV) groove by the inferior vena cava route, and electrophysiological demonstration of a concealed accessory pathway-mediated tachycardia was possible when a ventricular extrastimuli given during the His bundle refractoriness showed advancement of the atrium. A single energy application during tachycardia in the right antero-superior region of the AV groove resulted in the definitive interruption of the accessory pathway.
authors.forename: Alonso
authors.initials: A
authors.lastname: Pedrote
authors.forename: Eduardo
authors.initials: E
authors.lastname: Arana
authors.forename: Lorena
authors.initials: L
authors.lastname: García-Riesco
authors.forename: Enriqueta
authors.initials: E
authors.lastname: Maya
authors.forename: Francisco
authors.initials: F
authors.lastname: Errazquin
mesh_terms: D017115:Catheter Ablation; D002675:Child, Preschool; D022062:Electrophysiologic Techniques, Cardiac; D005260:Female; D018729:Fontan Procedure; D006330:Heart Defects, Congenital / Q000453:epidemiology* / Q000601:surgery; D006352:Heart Ventricles / Q000002:abnormalities*; D006801:Humans; D012008:Recurrence; D013617:Tachycardia, Supraventricular / Q000453:epidemiology / Q000601:surgery*