title: Electrocardiographic characteristics of fasciculoventricular pathways.
abstract: BACKGROUND
  Fasciculoventricular (FV) pathways are rare variants of preexcitation, and their ECGs may be misinterpreted as Wolff-Parkinson-White syndrome with anteroseptal accessory pathways (WPW-AS). We analyzed the electrocardiographic characteristics of the patients with FV pathways to find out the different findings from WPW-AS.
  
  
  RESULTS
  Five patients with FV pathways and four patients with WPW-AS who underwent electrophysiologic studies were evaluated. Intervals and amplitudes of each wave and QRS morphologies were analyzed in standard 12-lead ECGs of these patients by two independent cardiologists without the information of the electrophysiologic findings. PR intervals were longer in FV pathways (122 +/- 11.0 vs 83 +/- 21 ms, FV pathways vs WPW-AS, P = 0.017). In lead V1, narrower width of R waves (25 +/- 6 vs 45 +/- 13 ms, P = 0.037) and smaller amplitude of S waves (12.8 +/- 8.3 vs 26.6 +/- 7.4 mm, P = 0.037) were observed in FV pathways. The polarity of delta waves in V1 was flat or negative in contrast with the cases of WPW-AS in which the polarity was positive. Three of five patients had notching in the descending limb of S waves in V1, which was not observed in WPW-AS.
  
  
  CONCLUSIONS
  FV pathways have different ECG characteristics from WPW-AS in PR interval and morphology of QRS complexes in lead V1 of the standard 12-lead ECG.
authors.affiliation: Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea.
authors.forename: Seil
authors.initials: S
authors.lastname: Oh
authors.forename: Yun-Shik
authors.initials: YS
authors.lastname: Choi
authors.forename: Eue-Keun
authors.initials: EK
authors.lastname: Choi
authors.forename: Hyo-Soo
authors.initials: HS
authors.lastname: Kim
authors.forename: Dae-Won
authors.initials: DW
authors.lastname: Sohn
authors.forename: Byung-Hee
authors.initials: BH
authors.lastname: Oh
authors.forename: Myoung-Mook
authors.initials: MM
authors.lastname: Lee
authors.forename: Young-Bae
authors.initials: YB
authors.lastname: Park
mesh_terms: D000293:Adolescent; D000328:Adult; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D011226:Pre-Excitation Syndromes / Q000175:diagnosis* / Q000503:physiopathology; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis