Out-of-hospital cardiac arrest in octogenarians and nonagenarians.
BACKGROUND
Studies of elderly patients who have out-of-hospital cardiac arrest have contradictory results. The studies usually define elderly patients as those older than 70 years, and include relatively few octogenarians and nonagenarians.


OBJECTIVE
To compare the survival after out-of-hospital cardiac arrest of octogenarians, nonagenarians, and younger patients and to determine the influence of age on survival after adjusting for factors known to influence out-of-hospital cardiac arrest outcome.


METHODS
We conducted a retrospective cohort study in suburban King County, Washington, on 5882 patients who had out-of-hospital cardiac arrest from presumed cardiovascular disease between January 1, 1987, and December 31, 1998, and who received cardiopulmonary resuscitation from bystanders, emergency medical technicians, or both. The main outcome measure was survival to hospital discharge.


RESULTS
In patients who had out-of-hospital cardiac arrest due to a cardiac cause, younger patients had higher hospital discharge rates than octogenarians, who in turn had higher hospital discharge rates than nonagenarians (19.4% vs 9.4% vs 4.4%; P<.001). However, survival to hospital discharge improved significantly for younger patients, octogenarians, and nonagenarians who had ventricular fibrillation or pulseless ventricular tachycardia (36% vs 24% vs 17%; P<.001). After multiple logistic regression analysis controlling for other factors, increased age was weakly associated with decreased survival to hospital discharge (odds ratio, 0.92; 95% confidence interval, 0. 85-0.99).


CONCLUSIONS
Octogenarians and nonagenarians have lower survival to hospital discharge than younger patients, but age is a much weaker predictor of survival than other factors such as initial cardiac rhythm. Decisions regarding resuscitation should not be based on age alone. Arch Intern Med. 2000;160:3439-3443.
Kim
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C
Robert Wood Johnson Clinical Scholars Program, University of Washington, Campus Box 357183, Seattle, WA 98195-7183, USA. cathykim@u.washington.edu
Becker
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Eisenberg
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MS
D000368:Aged; D000369:Aged, 80 and over; D016887:Cardiopulmonary Resuscitation; D004632:Emergency Medical Services; D005260:Female; D006323:Heart Arrest / Q000401:mortality*; D006801:Humans; D008297:Male; D012044:Regression Analysis; D012189:Retrospective Studies; D012307:Risk Factors; D016019:Survival Analysis; D014861:Washington / Q000453:epidemiology