title: [Association between electrocardiogram characteristics and long-term outcome in patients with idiopathic ventricular fibrillation].
abstract: OBJECTIVE
  To explore the association between clinical and ECG characteristics and prognoses in patients with idiopathic ventricular fibrillation (VF).
  
  
  METHODS
  We reviewed the data from 21 VF patients [male 47.6%, mean age (38.5 ± 19.0) years] with first event of VF, all patients were resuscitated after cardiac arrest and diagnosed as idiopathic VF. The prevalence of J wave was assessed and patients were divided into J wave positive (J+ group) and negative group (J- group). The end point was death or syncope from arrhythmia, and recorded VF recurrence during the follow-up.
  
  
  RESULTS
  J wave was frequent in subjects with idiopathic VF (71.4%). Among patients in the J+ group (15 cases), notch on the QRS wave was found in 7 subjects (46.7%), these patients were more likely to suffer from the sudden cardiac arrest during sleep at early morning than those with J wave but without notch on the QRS wave. Two patients dead suddenly in the J+ group and 1 dead from embolism in the J- group during follow-up [mean (42.4 ± 39.9) months]. The mean year-onset of VF or syncope was significantly higher in the J+ group than in the J-group [(1.3 ± 0.5) episodes/year vs. (0.4 ± 0.3) episodes/year, P < 0.01]. J wave positive was also associated with an increased risk of VF recurrence (RR 1.9, 95%CI 1.1 to 2.9, P = 0.03).
  
  
  CONCLUSIONS
  J wave prevalence is high in patients with history of idiopathic VF, and positive J wave is associated with high risk of recurrence of sudden cardiac death.
authors.affiliation: Clinic EP Lab and Arrhythmia Treating Center, Cardiovascular Institute and Fu Wai Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing 100037, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Yu-He
authors.initials: YH
authors.lastname: Jia
authors.forename: Ke-Xiu
authors.initials: KX
authors.lastname: Mao
authors.forename: Xu-Hua
authors.initials: XH
authors.lastname: Chen
authors.forename: Ying-Jie
authors.initials: YJ
authors.lastname: Zhao
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.forename: Yu-Mei
authors.initials: YM
authors.lastname: Zhang
authors.forename: Xia-Yang
authors.initials: XY
authors.lastname: Zhu
authors.forename: Yan
authors.initials: Y
authors.lastname: Tao
authors.forename: Wei
authors.initials: W
authors.lastname: Hua
authors.forename: Shu
authors.initials: S
authors.lastname: Zhang
authors.forename: Jian-Min
authors.initials: JM
authors.lastname: Chu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D016757:Death, Sudden, Cardiac; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D016896:Treatment Outcome; D014693:Ventricular Fibrillation / Q000503:physiopathology* / Q000628:therapy; D055815:Young Adult