title: [Clinical analysis of inappropriate shock of implantable cardioverter defibrillators].
abstract: OBJECTIVE
  Implantable cardioverter defibrillator (ICD) can effectively treat life-threatening ventricular arrhythmias. The most common side effect is inappropriate discharge. This study analyzes the incidence and causes of inappropriate discharges of ICD in our hospital.
  
  
  METHODS
  Forty-three patients implanted with ICD in our hospital from November 2001 to October 2007 were involved in our study. Patients were followed-up regularly. All episodes recorded and stored in the ICD were analyzed.
  
  
  RESULTS
  Seven of the 43 patients underwent ninety-six inappropriate discharges. Inappropriate discharges in six patients were caused by supraventricular tachyarrhythmias (SVT). In one patient the discharge was caused by noise. Most inappropriate discharges occurred in the first year after implantation. The history of atrial fibrillation before implantation is an independent predictor of inappropriate discharges.
  
  
  CONCLUSIONS
  The incidence of inappropriate discharge is 16.3% in our study and the most common cause is SVT. Most inappropriate discharges occur in the first year after implantation. Patients with atrial fibrillation history have a higher risk of inappropriate discharges.
authors.affiliation: Department of Cardiology, the Second Affiliated Hospital of Sun Yat-sen University, Guangzhou 510120, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Cheng
authors.forename: Ru-qiong
authors.initials: RQ
authors.lastname: Nie
authors.forename: Jing-feng
authors.initials: JF
authors.lastname: Wang
authors.forename: Wo-liang
authors.initials: WL
authors.lastname: Yuan
authors.forename: Shu-xian
authors.initials: SX
authors.lastname: Zhou
authors.forename: Chang
authors.initials: C
authors.lastname: Fang
mesh_terms: D000368:Aged; D017147:Defibrillators, Implantable / Q000009:adverse effects*; D004868:Equipment Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged