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Eur J Clin Invest. 2013 Sep;43(9):933-48. doi: 10.1111/eci.12123. Epub 2013 Jul 22.

Incidence and prognosis of dysnatraemia in critically ill patients: analysis of a large prevalence study.

Author information

1
Department of General Internal Medicine, Erasme Hospital, Université libre de Bruxelles, Belgium. fvdgheyn@ulb.ac.be

Abstract

BACKGROUND:

The objective of this study is to assess the impact of dysnatraemia on mortality among intensive care unit (ICU) patients in a large, international cohort.

MATERIAL AND METHODS:

Analysis of the Extended Prevalence of Infection in Intensive Care (EPIC II) study, a 1-day (8 May 2007) worldwide multicenter, prospective point prevalence study. Hyponatraemia was categorized as mild (130-134 mM/L), moderate (125-129 mM/L) or severe (< 125 mM/L). Hypernatraemia was also categorized as mild (146-150 mM/L), moderate (151-155 mM/L) or severe (> 155 mM/L). Patients with normal serum sodium (135-145 mM/L) constituted the reference group. The main outcome was hospital mortality. Analysis was conducted separately for patients admitted on the study day (25.8%) and those already present on the ICU (74.2%).

RESULTS:

Serum sodium was measured in 13 276 of the 13 796 patients (96.2%). A total of 3815 patients (28.7%) had dysnatraemia: 12.9% with hyponatraemia and 15.8% with hypernatraemia. The prevalence of dysnatraemia was significantly greater in patients already present on the ICU prior to the study day than for those just admitted (13.1% vs. 12.3% for hyponatraemia and 17.1% vs. 12.1% for hypernatraemia, both P < 0.001). Hospital mortality rates were higher in patients with dysnatraemia than in those with normal sodium levels and were directly related to the severity of hypo- and hypernatraemia. This association between dysnatraemia and mortality was similar in infected and noninfected patients (P = 0.061).

CONCLUSIONS:

Dysnatraemia is more frequent during the ICU stay than on the day of admission. Dysnatraemia in the ICU - even mild - is an independent predictor of increased hospital mortality.

KEYWORDS:

Hypernatraemia; hyponatraemia; intensive care; propensity score; sodium

PMID:
23869476
DOI:
10.1111/eci.12123
[Indexed for MEDLINE]

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