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Intensive care is being scrutinized as a major factor in increasing health care costs. We examined 404 consecutive admissions to the medical ICUs at a university medical center to study patterns of consumption of ICU resources and the proportion of resources used by patients admitted for monitoring only. We found a skewed distribution of ICU resource consumption, with the "high-cost" 8 percent using as many ICU resources as the "low-cost" 92 percent. Forty-one percent of admissions did not receive acute ICU treatments, but these admissions consumed less than 10 percent of ICU resources. Reducing the number of patients admitted for monitoring will have a relatively small impact on hospital charges. Since over 70 percent of the high-cost patients died, improved understanding of prognosis and better physician-patient communication may substantially reduce the proportion of critical care resources expended on futile treatment.

Since intensive care is expensive and has limited efficacy, its use should be reserved primarily for patients with acute, reversible illnesses. Although age is related to ICU mortality, more important predictors of ICU outcome are severity of the acute illness, the admitting diagnosis, and previous health status. Thus, age should not be the sole factor considered prior to ICU transfer or the initiation or denial of resuscitative efforts. Geriatric physicians should prospectively develop individualized plans for each of their patients based upon the patients' wishes after a discussion of diagnosis, prognosis, and the likely efficacy and side effects of the available treatments.