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Background Little is known about the prevalence and prognostic impact of hyponatremia among patients admitted acutely to departments of internal medicine. We examined the prevalence of admission hyponatremia (serum sodium < 135 mmol/l) and its association with 30-day and 1-year mortality overall and according to diagnostic groups of previous morbidities and primary discharge diagnoses. Furthermore, we set out to identify threshold values predicting increased mortality, by treating serum sodium as a continuous variable.

Hyponatremia as a prognostic factor for 30-day and 1-year mortality in patients acutely admitted to departments of internal medicine