title: [Antitachycardia pacing in patients with implanted cardioverter defibrillators].
abstract: Efficacy and safety of the use of antitachycardia pacing (ATP) function in 54 patients (age 18-54, mean age 62.2 +/- 11.5 years, 6 women) with cardioverter defibrillators implanted for prevention of sudden death. Duration of follow-up was 6-64 months (mean 27.3 +/- 8.6 months). Ischemic heart disease (IHD) was etiopathogenetic basis for development of ventricular rhythm disturbances in 38 (70.4%) patients. Arrhythmogenic right ventricular dysplasia (ARVD) was diagnosed in 8 (14.8%), hypertrophic cardiomyopathy--in 3, dilated cardiomyopathy--in 2, the Brugada syndrome--in 2 patients, and long QT syndrome--in 1 patient. Three regimens of ATP were studied--burst, ramp, ramp(+)--which were activated in 22 patients (17 with IHD and 5 with ARVD). We registered 776 episodes of ATP occurring because of ventricular tachycardia (VT) in 20 of 22 patients with activated ATP. Overall efficacy of burst ATP was 49.1%; VT was not terminated or was accelerated in 43.2 and 7.6% of cases, respectively. Ramp ATP was effective in 44.3, ineffective--in 33.9, and caused VT acceleration in 21.8% of cases, what called forth fulfillment as a next step of shock therapy (cardioversion or defibrillation). ATP led to successful termination of VT in 67.5% of patients with IHD and to acceleration of arrhythmia--in 6% of episodes. Most effective type was ramp ATP which effectively terminated VT in 76.3% of cases, while efficacy of burst ATP was 61.4% (p < 0.01). In patients with ARVD total efficacy of ATP was 25%, acceleration of VT during ATP was observed in 24% of cases; optimal was burst ATP, which efficacy was 33.9%--significantly higher than efficacy of ramp and ramp+ ATP (19.4 and 24.4%, respectively, p < 0.005).
authors.forename: A V
authors.initials: AV
authors.lastname: Ardashev
authors.forename: A O
authors.initials: AO
authors.lastname: Dzhandzhgava
authors.forename: E G
authors.initials: EG
authors.lastname: Zheliakov
mesh_terms: D000293:Adolescent; D000328:Adult; D016757:Death, Sudden, Cardiac / Q000209:etiology / Q000517:prevention & control*; D017147:Defibrillators, Implantable / Q000592:standards*; D004554:Electric Countershock / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D004562:Electrocardiography; D004869:Equipment Safety; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D012307:Risk Factors; D017180:Tachycardia, Ventricular / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology / Q000628:therapy; D016896:Treatment Outcome