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21 May 2017 : Clinical Research  

Dysnatremia is an Independent Indicator of Mortality in Hospitalized Patients

Jiachang Hu123ABCDEF, Yimei Wang123ABCDEF, Xuemei Geng123BCDE, Rongyi Chen123BCDEF, Pan Zhang123BCDEF, Jing Lin123BCDEF, Jie Teng123ABCDE, Xiaoyan Zhang123ABCDEF, Xiaoqiang Ding123ABCDEFG*

DOI: 10.12659/MSM.902032

Med Sci Monit 2017; 23:2408-2425

Abstract

BACKGROUND: Dysnatremia is a risk factor for poor outcomes. We aimed to describe the prevalence and outcomes of various dysnatremia in hospitalized patients. High-risk patients must be identified to improve the prognosis of dysnatremia.

MATERIAL AND METHODS: This prospective study included all adult patients admitted consecutively to a university hospital between October 1, 2014 and September 30, 2015.

RESULTS: All 90 889 patients were included in this study. According to the serum sodium levels during hospitalization, the incidence of hyponatremia and hypernatremia was 16.8% and 1.9%, respectively. Mixed dysnatremia, which was defined when both hyponatremia and hypernatremia happened in the same patient during hospitalization, took place in 0.3% of patients. The incidence of dysnatremia was different in various underlying diseases. Multiple logistic regression analyses showed that all kinds of dysnatremia were independently associated with hospital mortality. The following dysnatremias were strong predictors of hospital mortality: mixed dysnatremia (OR 22.344, 95% CI 15.709–31.783, P=0.000), hypernatremia (OR 13.387, 95% CI 10.642–16.840, P=0.000), and especially hospital-acquired (OR 16.216, 95% CI 12.588–20.888, P=0.000) and persistent (OR 22.983, 95% CI 17.554–30.092, P=0.000) hypernatremia. Hyponatremia was also a risk factor for hospital mortality (OR 2.225, 95% CI 1.857–2.667). However, the OR increased to 56.884 (95% CI 35.098–92.193) if hyponatremia was over-corrected to hypernatremia.

CONCLUSIONS: Dysnatremia was independently associated with poor outcomes. Hospital-acquired and persistent hypernatremia were strong risk factors for hospital mortality. Effective prevention and proper correction of dysnatremia in high-risk patients may reduce the hospital mortality.

Keywords: Adolescent, Hospitalized, Hypernatremia, Hyponatremia, Mortality

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750