Why is hyponatremia more present in the summer months?

Updated: Aug 24, 2020
  • Author: Kartik Shah, MD; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
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A study by Giordano et al found a significant increase in the prevalence of hyponatremia in elderly patients visiting a university hospital emergency department during the summer. Prevalence during the summer was 12.5% (zenith) in the elderly, compared with a mean monthly prevalence of 10.3% in these patients. The investigators suggested that factors such as reduced renal function, salt loss, a decline in salt intake, and increased water ingestion may play a role in the increased prevalence of hyponatremia in the elderly during hot-weather months. [12]

Similarly, a study by Huwyler et al found an increased incidence of adult patients with profound hyponatremia in a university hospital emergency department during the summer (1.29%, compared with 0.54% in the winter). Based on multivariate analysis, the investigators reported that the rise in incidence was related to patient age, the presence of psychiatric disorders, and the use of diuretics (either potassium-sparing or thiazide). [13]

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