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.
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