title: Idiopathic left ventricular outflow tract ectopy: a single focus with extremely divergent breakouts.
abstract: BACKGROUND
  Idiopathic ventricular tachycardia (VT) and/or premature ventricular contractions (PVCs) arise most commonly from the right ventricular outflow tract and less frequently from the left ventricular outflow tract (LVOT), either below or above the semilunar valves.
  
  
  METHODS
  We report a case of 24-year-old man with idiopathic ventricular tachycardia from a single focus in the supravalvular left ventricular outflow tract with two extremely divergent breakouts observed during the ablation procedure.
  
  
  CONCLUSIONS
  Focal sources of ventricular arrhythmia in the aortic root may have different preferential exits and meticulous activation sequence mapping is the preferable strategy to delineate the site of origin.
authors.forename: Sherif
authors.initials: S
authors.lastname: Gouda
authors.affiliation: Department of Cardiology, Institute for Clinical and Experimental Medicine, Vídeňská 1958/9, Prague 14021, Czech Republic. dan.wichterle@ikem.cz.
authors.forename: Dan
authors.initials: D
authors.lastname: Wichterle
authors.forename: Petr
authors.initials: P
authors.lastname: Peichl
authors.forename: Josef
authors.initials: J
authors.lastname: Kautzner
mesh_terms: D000200:Action Potentials; D017115:Catheter Ablation; D004562:Electrocardiography; D022062:Electrophysiologic Techniques, Cardiac; D006329:Heart Conduction System / Q000503:physiopathology* / Q000601:surgery; D006352:Heart Ventricles / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D008297:Male; D011237:Predictive Value of Tests; D017180:Tachycardia, Ventricular / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery; D016896:Treatment Outcome; D018879:Ventricular Premature Complexes / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery; D055815:Young Adult