Objective Observed the efficacy of the patients with implantable cardioverter defibrillators (ICD). Sought to identify the reasons of inappropriate shocks, to minimise the risk of inappropriate shocks.
Methods Followed up nineteen patients with ICD. Stored ICD electrograms from all shocks episodes were analysed to distinguish appropriate and inappropriate shocks according to history of tachycardia. Any ICD therapy not delivered for VT or VF was deemed inappropriate shocks therapy. It can be considered as inappropriate that ICD firing for sinus tachycardia, supraventricular tachycardia, atrial fibrillation, atrial flutter, and nonsustained ventricular tachycaidia.
Result There is no shock episode in ten patients (52.63%). Appropriate shocks occurred in 6 patients (31.58%) Inappropriate shocks occurred in three patients (15.79%). Inappropriate shock episodes constituted 4 of 11 total shock episodes. We presented three cases of inappropriate shocks due to atrial fibrillation, sinus tachycardia and high frequency noise.
Conclusions Inappropriate shocks occurred commonly in our cases. Varied reason induced the inappropriate shocks. Programing the device parameter and choosing proper discriminators can minimised rate of inappropriate shocks.
- Implantable cardioveter-defibrillator (ICD) inappropriate shocks therapy ventricular arrhythmia