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Abstract: FR-PO287

Hyponatremia and Mortality Among Very Elderly Residents in a Geriatric Health Service Facility

Session Information

Category: Fluid and Electrolytes

  • 902 Fluid and Electrolytes: Clinical


  • Naka, Tamayo, Nishizaki Hospital, Itoman city, Japan
  • Kohagura, Kentaro, University of the Ryukyus Hospital, Nishihara-cho, OKINAWA, Japan
  • Kochi, Masako, University of the Ryukyus, Nishihara-cho, Japan
  • Ohya, Yusuke, University of the Ryukyus, Nishihara-cho, Japan

Hyponatremia is common among elderly patients. This study aimed to examine the prognostic value of hyponatremia among elderly residents in a geriatric facility.


We retrospectively examined the association between serum sodium levels and mortality among 118 residents (82% female, mean age 85.5 years) in a single geriatric health service facility. We defined hyponatremia as Na <135 mEq/L. On the basis of single measurements of serum sodium at periodic examinations, the patients were divided into hyponatremia and non-hyponatremia groups. Multivariable Cox proportional hazards models were used to evaluate the effect of hyponatremia on mortality from May 2005 to April 2007.


Thirty-three patients (28%) had hyponatremia. Over a 1-year follow-up period, the cumulative survival rate was significantly lower in patients with hyponatremia than in those without hyponatremia. In a multivariate analysis, including traditional risk factors for death, hyponatremia was associated with an increased mortality risk (adjusted hazard ratio, 2.73; 95% confidence interval, 1.01–5.16; p = 0.047).


Hyponatremia is common and is a predictor of mortality in the near future among very elderly residents of a geriatric facility.