title: [Therapy with implanted cardioverter-defibrillator: Is a replacement of the impulse generator due to battery depletion also necessary without the occurrence of a tachyarrhythmia episode?].
abstract: The aim of this retrospective study was to evaluate the necessity of the replacement of an implantable cardioverter/defibrillator (ICD) in patients with pulse generator battery depletion without an adequate, spontaneous arrhythmia episode during the life-time of the first implanted device. In this study 213 patients with implanted ICDs were enrolled. In 62 patients an elective generator replacement due to battery depletion was performed. Both patient groups (Group A: patients with generator replacement n = 62 and Group B: patients without replacement n = 151) were not different with regard to main clinical characteristics, such as underlying heart disease and left ventricular function. In both groups there was a predominance of male patients (Group A: 89%; Group B: 83%). The mean age was 58 +/- 11 years and 59 +/- 11 years in Group A and Group B, respectively. Coronary artery disease was present in 66% and 68% of the patients. There was a comparable left ventricular ejection fraction: Group A: 30.5 +/- 9% vs Group B: 31.9 +/- 9%. The follow-up time was much longer in Group A patients compared to Group B patients (50.5 +/- 14 vs. 16.5 +/- 11 months). For the total patient group there was a 5 year event-free probability of 23%, no differences were found between both groups. The subanalysis in Group A patients revealed no difference in the probability of ICD-shock occurrence prior to or after the replacement of the pulse generator. In 48/62 (77%) of Group A patients adequate ICD discharges were documented. In 15/62 (24%) patients shock occurred before and after generator replacement. In 6/62 (10%) of Group A patients, the first adequate ICD-therapy was documented after generator replacement. The results of this study indicate the necessity of an ICD-pulse generator replacement even in patients without an adequate device discharge during the life-time of the first implanted device.
authors.affiliation: Abt. für Kardiologie Max-Planck-Institut für physiologische und klinische Forschung, Bad Nauheim.
authors.forename: M
authors.initials: M
authors.lastname: Dürsch
authors.forename: H F
authors.initials: HF
authors.lastname: Pitschner
authors.forename: T
authors.initials: T
authors.lastname: Schwarz
authors.forename: J
authors.initials: J
authors.lastname: Sperzel
authors.forename: S
authors.initials: S
authors.lastname: König
authors.forename: H
authors.initials: H
authors.lastname: Bahavar
authors.forename: W P
authors.initials: WP
authors.lastname: Klövekorn
authors.forename: J
authors.initials: J
authors.lastname: Neuzner
mesh_terms: D000368:Aged; D017147:Defibrillators, Implantable; D011211:Electric Power Supplies; D004868:Equipment Failure; D005260:Female; D005500:Follow-Up Studies; D006331:Heart Diseases / Q000150:complications / Q000401:mortality / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012189:Retrospective Studies; D015996:Survival Rate; D013610:Tachycardia / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*
vernacular_title: Therapie mit implantierbaren Kardioverter/Defibrillatoren: Ist ein Austausch des Impulsgenerators bei Batterieerschöpfung auch ohne stattgehabte Tachyarrhythmie-Episode notwendig?