Reduced Survival with Increasing Plasma Osmolality in Elderly Continuing-care Patients

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Abstract
The results reported here are from a 2-year follow-up study of 58 elderly patients in a continuing-care unit. Most of these patients were in a hyperosmolar state at the time of entry (mean plasma osmolahty 304 ± 8 mOsmol/kg). The survival of those patients with the highest osmolality (> 308 mOsmol/kg) was significantly reduced (p = 0.025), with an increased mortality at 2 years (15/20 patients, p = 0.053). There was no correlation between age and plasma osmolality (r = 0.02) and the effect of osmolality on survival was independent of age. Hyperosmolality was either a marker for, or a cause of, increased mortality in this group of frail elderly patients.

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