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BMC Emergency Medicine
Published in: BMC Emergency Medicine 1/2018

Open Access 01-12-2018 | Research article

Seasonal prevalence of hyponatremia in the emergency department: impact of age

Authors: Naohiko Imai, Kiyomi Osako, Nagayuki Kaneshiro, Yugo Shibagaki

Published in: BMC Emergency Medicine | Issue 1/2018

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Abstract

Background

Hyponatremia is one of the most commonly encountered electrolyte disorders in emergency department (ED). Seasonal fluctuations of the prevalence of hyponatremia has been reported. We investigated the impact of age on the seasonal prevalence of hyponatremia in the emergency department in Japan.

Methods

Total of 8377 patients presented to the ED between January 2015 and December 2016 were reviewed. The adult group aged between 18 and 64 years old consisted of 3656 patients and the elderly group aged over 65 years consisted of 4721 patients. Information collected included age, sex, serum sodium, and serum creatinine. Hyponatremia was defined as a serum sodium leve1 < 135 mEq/L and severe hyponatremia was defined as a serum sodium level < 125 mEq/L.

Results

Prevalence of hyponatremia was significantly higher in the elderly group than in the adult group (17.0% vs. 5.7%, p < 0.001). Similarly, the prevalence of severe hyponatremia was significantly higher in the elderly group than in the adult group (1.9% vs. 0.3%, p < 0.001). Prevalence of hyponatremia and severe hyponatremia was significantly higher in the elderly group than in the adult group in all seasons. In the elderly group, there was a significant correlation between weather high temperature during summer and prevalence of hyponatremia (r = 0.510, p = 0.011).

Conclusion

There was a major impact of age on the seasonal prevalence of hyponatremia and severe hyponatremia. Strategies to prevent hyponatremia and severe hyponatremia should be taken especially in the elderly patients during summer.
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Metadata
Title
Seasonal prevalence of hyponatremia in the emergency department: impact of age
Authors
Naohiko Imai
Kiyomi Osako
Nagayuki Kaneshiro
Yugo Shibagaki
Publication date
01-12-2018
Publisher
BioMed Central
Published in
BMC Emergency Medicine / Issue 1/2018
Electronic ISSN: 1471-227X
DOI
https://doi.org/10.1186/s12873-018-0182-5

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