The Comparative Study Of The Defibrillation Leads Implanted In The Right Ventricular Outflow Tract And In The Right Ventricular Apex

ObjectiveTo compare the defibrillation thresholds (DFT), safety and therapeutic efficacy between the right ventricular outflow tract (RVOT) and right ventricular apex(RVA).MethodAccording the time order,19 patients who were enrolled in this trail underwent defibrillation threshold testing in the RVA or RVOT by using a binary search algorithm. After a follow-up of 6 months, relative parameters were tested and relative data which was stored in implantable cardioverter defibrillator were analyzed with statistical analysis.ResultThe difference of DFT in leads placed in the RVOT and RVA was not statistically significant (median:15Jvs17.5J, P=0.48). And, at time of device implantation, pacing impedance, R wave amplitude, pacing threshold were comparable in the RVOT and RVA. The difference of the incidence of inappropriate detections and therapies was not statistically significant (4/11vs1/8, P=0.267).ConclusionThe efficiency of defibrillation and pacing in the RVOT and RVA are similar. RVOT ICD lead placement exhibits similar lead stability, pacing threshold, R wave amplitude, pacing impedance, therapeutic efficacy as the RVA lead placement.