title: Diagnosis and long-term follow-up of the Brugada syndrome in patients with idiopathic ventricular fibrillation.
abstract: OBJECTIVE
  Some patients with idiopathic ventricular fibrillation may suffer from the Brugada syndrome. The diagnostic criteria for the Brugada syndrome are uncertain and arbitrarily set. Therefore, we studied the prevalence of the Brugada syndrome using various diagnostic criteria and long-term follow-up in 37 idiopathic ventricular fibrillation patients.
  
  
  RESULTS
  Idiopathic ventricular fibrillation was diagnosed after thorough clinical evaluation in 37 survivors of an out-of-hospital cardiac arrest referred to our institute (UMC Utrecht). Retrospectively, nine patients (24%, group I) were classified as potentially having the Brugada syndrome based on the presence of (in)complete right bundle branch block and ST-segment elevation in leads V(1)-V(3)of > or =1 mm. Only three patients (8%, group II) showed (in)complete right bundle branch block and > or =2 mm ST-segment elevation. With the intermittent presence of these ECG features and/or their (re)appearance with class I antiarrhythmic drugs included as criteria, the percentage of the Brugada syndrome was attenuated in group I (2/37; 5%) and group II (1/37; 3%). Sixteen (43%) of all idiopathic ventricular fibrillation patients (mean follow-up 77+/-41 months) had a recurrent episode of syncope, ventricular tachyarrhythmias or sudden death. Recurrence rate was 3/9 (33%) in Brugada patients group I, 2/3 (66%) in group II and 13/28 (46%) in patients without the Brugada syndrome (P=ns).
  
  
  CONCLUSIONS
  Depending on the diagnostic criteria used, the Brugada syndrome was observed in 3% to 24% of patients with idiopathic ventricular fibrillation, underlining the importance of defining the precise diagnostic criteria in these patients. For all idiopathic ventricular fibrillation patients, the ventricular tachyarrhythmia recurrence rate was substantial during an average follow-up of more than 6 years.
authors.affiliation: Department of Cardiology, Heart-Lung Centre Utrecht, The Netherlands.
authors.forename: C A
authors.initials: CA
authors.lastname: Remme
authors.forename: E F
authors.initials: EF
authors.lastname: Wever
authors.forename: A A
authors.initials: AA
authors.lastname: Wilde
authors.forename: R
authors.initials: R
authors.lastname: Derksen
authors.forename: R N
authors.initials: RN
authors.lastname: Hauer
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002037:Bundle-Branch Block / Q000150:complications / Q000175:diagnosis*; D003430:Cross-Sectional Studies; D016757:Death, Sudden, Cardiac; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006323:Heart Arrest / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D016019:Survival Analysis; D016896:Treatment Outcome; D014693:Ventricular Fibrillation / Q000150:complications / Q000175:diagnosis*