Abstract

This observational study investigated the impact of hyponatremia resolution on the results of a comprehensive geriatric assessment (CGA) in 150 patients with age ≥70 years and serum sodium <130 mEq/L. The test battery including Barthel index of Activities of Daily Living (ADL) and various tests of neurocognitive function, motor performance and mood stability was applied on admission and at discharge. Changes of individual test results (Δ) were analyzed and normonatremic patients matched for age, gender, and ADL served as reference group. Most CGA test results improved. The improvement was more pronounced in the hyponatremia group with respect to ADL (ΔADL: 14.3 ± 17.1 vs. 9.8 ± 14.7; p = 0.002) and MMSE (ΔMMSE: 1.8 ± 3.0 vs. 0.7 ± 1.9; p = 0.002). Effect sizes were small (i.e., >0.2) in the overall analysis for ΔADL and ΔMMSE and moderate (i.e., >0.5) for ΔMMSE in the euvolemic subgroup. Beneficial effects on ΔADL and ΔMMSE were only observed in the subgroup of patients in which [Na+] was raised by >5 mEq/L and multivariable linear regression analysis confirmed [Na+] increase to be an independent predictor of MMSE improvement. Resolution of hyponatremia has a beneficial impact on the geriatric patients’ overall functional status, in particular in euvolemic cases.

Highlights

  • The primary objective of this observational study was to analyze the impact of resolution of hyponatremia on the results of a commonly used comprehensive geriatric assessment (CGA) in a real-world setting

  • 6,066 geriatric patients were admitted during the study period. 145 (2.5%) were hypernatremic ([Na+] >145 mEq/L), 4,937 (81.5%) were normonatremic, and 984 (16%) were hyponatremic ([Na+]

  • This study demonstrates the effect of inpatient care in a specialized geriatric institution on the results of a CGA test battery in patients admitted with or for non-severely symptomatic hypotonic hyponatremia

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Summary

Objectives

The primary goal of this study was to analyze the effect of hyponatremia treatment on neurocognitive and motor performance over time, we looked at the effect of hyponatremia on CGA itself by comparing the baseline test results of hyponatremic patients with an age- and gender-matched control group that was not adjusted for ADL or any other baseline test result

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