Copyright © 2002 by the European Society of Cardiology.
Efficacy of a dual chamber defibrillator with atrial antitachycardia functions in treating spontaneous atrial tachyarrhythmias in patients with life-threatening ventricular tachyarrhythmias
a San Filippo Neri Hospital, Rome, Italy
b Santa Chiara Hospital, Trento, Italy
c Civile Hospital, Piacenza, Italy
d Careggi Hospital, Florence, Italy
e S. Anna Hospital, Como, Italy
f Medtronic, Italy
revised December 17, 2001; accepted December 18, 2001
Abstract
Background Atrial fibrillation has a high incidence in patients wearing an implantable cardioverter defibrillator for ventricular tachyarrhythmias and may lead to palpitations, heart failure, angina, stroke and inappropriate defibrillator discharge. The aim of the study was to evaluate the efficacy of a dual chamber defibrillator with atrial antitachycardia functions in treating spontaneous atrial tachyarrhythmias.
Methods One hundred and twelve patients, 88 male, mean age 64±11 years, were enrolled. Seventy-six had ischaemic heart disease, 21 idiopathic dilated cardiomyopathy, nine other heart diseases, six no structural heart disease. The mean left ventricular ejection fraction was 40±11%. Sixty-two had prior atrial tachyarrhythmias.
Results Follow-up lasted 11±9 months (range 142). Among 933 ventricular tachyarrhythmia episodes, 100% of ventricular fibrillation and 92% of ventricular tachycardia were successfully cardioverted. Among 414 detected sustained atrial tachyarrhythmias, 195 were classified as atrial tachycardia (47·1%), 192 as atrial fibrillation (46·4%) and 27 (6·5%) as sinus rhythm. The detection-positive predictive value was 93·5%. Therapy success rates: antitachy pacing on atrial tachycardia=71·3% (crude estimate); 66·1% (adjusted estimate); 50 Hertz on atrial fibrillation=36·2% (crude estimate); 13·5% (adjusted estimate); atrial shock on atrial fibrillation=62·5% (mean energy 7·8±14·1J). Shock efficacy was 32% when delivered energy was
2 atrial defibrillation threshold at implant and 92% when >2. Duration of successfully treated atrial episodes was significantly lower than that of unsuccessfully treated (6±26min vs 42±60).
Conclusions Atrial antitachy pacing and shock therapies demonstrated very high efficacy in treating atrial tachyarrhythmias in defibrillator patients. Copyright 2002 The European Society of Cardiology. Published by Elsevier Science Ltd. All rights reserved.
Key Words: Atrial fibrillation, ventricular tachyarrhythmias, dual chamber defibrillator, atrial antitachycardia therapies, cardioversion
f1 Correspondence: Dr Renato Ricci, M.D., Via Antonio Sogliano 84, 00164 Rome, Italy.
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