What are the treatment recommendations for normovolemic (euvolemic), asymptomatic hyponatremia?

Updated: Jun 17, 2019
  • Author: Eric E Simon, MD; Chief Editor: Vecihi Batuman, MD, FASN  more...
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For normovolemic (euvolemic), asymptomatic hyponatremic patients, free water restriction (< 1 L/d) is generally the treatment of choice. There is no role for hypertonic saline in these patients. Base the volume of restriction on the patient's renal diluting capacity. For instance, fluid restriction to 1 L/d, which is enough to raise the serum sodium in some patients, may exceed the renal free water excretion capacity in others, necessitating more severe restriction. This approach is recommended as initial treatment for patients with asymptomatic SIADH. However, many patients will not adhere to fluid restriction. Further, the definition of asymptomatic is changing due to the recognition that subtle but significant deficits, such as in gait, may be present. Therefore, pharmacologic treatment may be considered (see below).

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