title: The potential role of local voltage potentials in right ventricular outflow tract arrhythmias: 47 cases with ventricular arrhythmias originating from right ventricular outflow tract.
abstract: OBJECTIVE
  The object of this study was to investigate the possible role of local voltage potentials (LVPs) in mapping the ventricular arrhythmias originating from right ventricular outflow (RVOT).
  
  
  METHODS
  Forty-seven patients with RVOT VAs (ventricular arrhythmias), referred for radiofrequency catheter ablation to our hospital, were analysed retrospectively for the prevalence, characteristics and electrophysiological evaluation of the LVPs recorded in successful and unsuccessful ablation sites.
  
  
  RESULTS
  Radiofrequency ablation was successful immediately in all the 47 cases. Catheter ablation was performed at a mean of 8 +/- 6 sites per patient. There were 58 effective ablation sites, 5 cases with changing morphology of ventricular arrhythmias (VAs), and 318 invalid ablation sites. Activation times at effective ablation sites were slightly earlierthan those at invalid ablation sites (-28 +/- 8 ms vs-24 +/- 7 ms, P < 0.05). The LVPs appeared during VAs in 47 sites of the 58 effective ablation sites (81.0%), far more than the 22 sites of the 318 invalid ablation sites (6.9%) (P < 0.01). In two cases VAs recurred during follow-up. They received a second catheter ablation.
  
  
  CONCLUSIONS
  Local ventricular potentials can be recorded in most patients with idiopathic VAs originating from the right outflow tract.The local potentials may facilitate successful radiofrequency ablation.
authors.affiliation: Dept. of Cardiology, The 98th Hospital of the PLA, Huzhou, China. jzfeng2013@163.com
authors.forename: Jin-Zhong
authors.initials: JZ
authors.lastname: Feng
authors.affiliation: Dept. of Cardiology, The 98th Hospital of the PLA, Huzhou, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wu
authors.affiliation: Dept. of Cardiology, The 98th Hospital of the PLA, Huzhou, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhou
authors.affiliation: Dept. of Cardiology, The 98th Hospital of the PLA, Huzhou, China.
authors.forename: Jun-Bo
authors.initials: JB
authors.lastname: Sun
authors.affiliation: Dept. of Cardiology, The 98th Hospital of the PLA, Huzhou, China.
authors.forename: Suai
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Dept. of Cardiology, The 98th Hospital of the PLA, Huzhou, China.
authors.forename: Yi-Hua
authors.initials: YH
authors.lastname: Qiu
authors.affiliation: Dept. of Cardiology, The 98th Hospital of the PLA, Huzhou, China.
authors.forename: He-De
authors.initials: HD
authors.lastname: Luo
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000328:Adult; D017115:Catheter Ablation; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D008297:Male; D012189:Retrospective Studies; D013617:Tachycardia, Supraventricular / Q000503:physiopathology* / Q000601:surgery