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Original Research

Open Access

Incidence of hyponatraemia in the emergency unit


1Merkur University Hospital, Department of Internal Medicine, University of Zagreb, School of Medicine, Zagreb, Croatia

2Zagreb University School of Medicine, Zagreb, Croatia

3General Hospital Vinkovci, Department of Internal Medicine, Vinkovci, Croatia

DOI: 10.22514/SV101.062015.7 Vol.10,Issue S1,June 2015 pp.29-31

Published: 22 June 2015

*Corresponding Author(s): INGRID PRKAČIN E-mail:

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Hyponatraemia is an electrolyte disorder, defined as a serum sodium concentration (Na) <136 mmol/L. It occurs in up to 30% of hospitalised patients. The purpose of this study was to evaluate the frequency of hyponatraemia among all patients during a one month period in the emergency unit. During the one month period in 2014, 570 patients were included in this study. The study was approved by local ethics com-mittees and patients provided written in-formed consent. 

Out of the 570 patients, 41 (7%) had hy-ponatraemia. The median age was 67 (65.02±14.09) years and the majority of the patients were men (M:F = 23:18; 56.1:43.9%). Mild hyponatraemia (serum Na 130-135 mmol/L) was found in 71% (29/41), moderate (serum Na 125-129 mmol/L) in 17% (7/41), severe (serum Na 120-124 mmol/L) in 5% (2/41), and ex-tremely severe (serum Na< 120 mmol/L) in 7% (3/41) of patients. The treatment options included the restriction of fluid intake by administering hypertonic saline and loop diuretics.

We should be alert to acute hyponatraemia, especially in elderly patients with neuro-logical manifestations and poor progno-sis. The presented data are an important contribution to the better understanding of the epidemiology of hyponatraemia in Croatia.

Key words

 hyponatraemia, emergency unit

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