title: Narrow QRS ventricular tachycardia.
abstract: OBJECTIVE
  To determine the frequency and clinical characteristics of narrow QRS ventricular tachycardia (QRS duration less than or equal to 0.11 seconds).
  
  
  METHODS
  Consecutive survey of patients with ventricular tachycardia.
  
  
  METHODS
  Tertiary, referral-based arrhythmia service at a university medical center.
  
  
  METHODS
  Sequential sample of patients with inducible ventricular tachycardia who had a 12-lead electrocardiogram of the tachycardia available for review.
  
  
  RESULTS
  Of 106 patients with ventricular tachycardia, 5 (4.7%; 95% CI, 2.1% to 10.6%) had ventricular tachycardia with a QRS duration less than or equal to 0.11 seconds. Three of the five patients were previously incorrectly diagnosed as having supraventricular tachycardia. All five patients had at least two electrocardiographic findings other than QRS duration to suggest ventricular tachycardia.
  
  
  CONCLUSIONS
  Narrow QRS ventricular tachycardia should be considered in the differential diagnosis of narrow QRS tachycardias. Electrocardiographic findings other than QRS duration are usually present to suggest the diagnosis.
authors.affiliation: University of Washington Medical Center, Seattle 98195.
authors.forename: J J
authors.initials: JJ
authors.lastname: Hayes
authors.forename: R B
authors.initials: RB
authors.lastname: Stewart
authors.forename: H L
authors.initials: HL
authors.lastname: Green
authors.forename: G H
authors.initials: GH
authors.lastname: Bardy
mesh_terms: D003937:Diagnosis, Differential; D004562:Electrocardiography; D006352:Heart Ventricles; D006801:Humans; D008875:Middle Aged; D013610:Tachycardia / Q000175:diagnosis*; D013617:Tachycardia, Supraventricular / Q000175:diagnosis