title: Intraoperative defibrillation threshold testing and postoperative long-term efficacy of cardioverter-defibrillator implantation.
abstract: The aim of this study was to determine the defibrillation threshold (DFT) of implantable cardioverter-defibrillators (ICDs) and outcomes of treatment. Sixty-four patients received cardioverter-defibrillator implantation. During implantation, the DFT was determined by the defibrillation safety margin (DSM). All patients were followed up for 12-48 months after the implantation. The overall DFT was 14.27±2.56 J and the DSM was 18.40±1.89 J. Malignant ventricular arrhythmias occurred in 42 patients following cardioverter-defibrillator implantation including 500 episodes of non-sustained ventricular tachycardia (VT) and 289 episodes of persistent VT. VT was treated using antitachycardia pacing (ATP); 265 episodes were treated successfully by a single ATP treatment (91.69%) and 12 episodes were treated successfully by two ATP treatments (4.15%). Twelve episodes were converted by low-energy electrical cardioversion (4.15%). A total of 175 ventricular fibrillation (VF) episodes were identified, of which 18 episodes automatically terminated prior to treatment. In total, 146 episodes were converted by a single cardioversion with a defibrillation energy of 13.21±2.58 J and 11 episodes were converted by two cardioversions with a defibrillation energy of 16.19±2.48 J. It is safe and feasible to determine the DFT by DSM measurement during cardioverterdefibrillator implantation.
authors.affiliation: Department of Cardiology, First Affiliated Hospital, Xinjiang Medical University, Urumqi, Xinjiang 830054;
authors.forename: Tianyi
authors.initials: T
authors.lastname: Gan
authors.forename: Xiaozhi
authors.initials: X
authors.lastname: Cao
authors.forename: Zhang
authors.initials: Z
authors.lastname: Yu
authors.forename: Baopeng
authors.initials: B
authors.lastname: Tang
authors.forename: Jinxin
authors.initials: J
authors.lastname: Li
authors.forename: Guojun
authors.initials: G
authors.lastname: Xu
authors.forename: Xianhui
authors.initials: X
authors.lastname: Zhou
authors.forename: Yanyi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yaodong
authors.initials: Y
authors.lastname: Li
authors.forename: Jianghua
authors.initials: J
authors.lastname: Zhang