Age dependent efficacy of implantable cardioverter-defibrillator treatment: observations in 450 patients over an 11 year period.
OBJECTIVE
To determine whether implantable cardioverter-defibrillator (ICD) treatment is beneficial in elderly patients with life threatening ventricular tachyarrhythmias.


METHODS
Since January 1984, ICDs were implanted in 450 patients to evaluate surgical risk, complications and mean survival in relation to patient age; 81 patients (18%) were < or = 50 years at the time of ICD implant, 254 patients (56%) were between 51 and 64 years, and the remaining 115 (26%) were > or = 65 years. Epicardial lead systems were implanted in 209 patients (46%), while transvenous lead systems were implanted in 241 (54%).


RESULTS
13 patients (3%) died perioperatively, more often after epicardial (11 of 209 patients, 5%) than after transvenous ICD implantation (one of 241 patients, < 1%) (p < 0.05). During a mean (SD) follow up of 28 (24) months (range < 1 to 114 months), 90 patients (20%) died. Of these, nine (2%) died from sudden arrhythmic death; five (1%) died suddenly, probably as a result of non-arrhythmic causes; 55 (12%) died from other cardiac causes (congestive heart failure, myocardial infarction); and 21 (5%) died from non-cardiac causes. The three, five, and seven year survival for arrhythmic mortality was 95% in patients < or = 50 years compared with a three year survival of 93% and a five and seven year survival of 91% in patients of 51 to 64 years, and a three, five, and seven year survival of 99% in patients > or = 65 years. 362 patients (80%) received ICD discharges (21 (43) shocks per patient), with a similar incidence among all three patient groups (< or = 50 years, 80%; 51 to 64 years, 81%; > or = 65 years, 79%). The time interval between ICD implant and the first ICD treatment was shorter in patients > or = 65 years (8 (8) months) than in patients between 51 and 64 years (11 (14) months) or < or = 50 years (11 (11) months) (p < 0.05). Survival time following first appropriate shock was 30 (24) months in patients < or = 50 years, 30 (26) months in patients of 51 to 64 years, and 19 (20) months in patients > or = 65 years.


CONCLUSIONS
Elderly patients benefit from ICD treatment, and survive for a considerable time after the first treatment. Therefore, elderly patients should be considered candidates for ICD implantation if life threatening ventricular tachy-arrhythmias are present.
Trappe
H J
HJ
Department of Cardiology and Angiology, University Hospital Herne, Ruhr University Bochum, Germany.
Pfitzner
P
P
Achtelik
M
M
Fieguth
H G
HG
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D017147:Defibrillators, Implantable / Q000009:adverse effects; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D015996:Survival Rate; D017180:Tachycardia, Ventricular / Q000401:mortality / Q000628:therapy*