Hyponatremia in Emergency Medicine Medication
- Author: Sandy Craig, MD; Chief Editor: Erik D Schraga, MD more...
Medication Summary
Appropriate treatment of hyponatremia depends on the correct classification of hyponatremia, the concomitant disease state, the severity of symptoms, and the severity of hyponatremia.
Electrolyte Supplements
Class Summary
Hypertonic saline may be used to rapidly increase serum sodium level in patients with severe acute or chronic hyponatremia, as manifested by severe confusion, coma, seizures, or evidence of brainstem herniation.
Hypertonic (3%) saline
Contains 513 mEq/L of NaCl. Volume of hypertonic saline administered depends on current and desired serum sodium levels and patient's weight. In general, increase of 4-6 mEq/L in serum sodium level is sufficient to arrest progression of symptoms in severe hyponatremia. Further rapid increase in serum sodium level not indicated.
Arginine Vasopressin Antagonists
Class Summary
These agents treat hyponatremia through V2 antagonism of AVP in the renal collecting ducts. This effect results in aquaresis (excretion of free water).
Conivaptan (Vaprisol)
Arginine vasopressin antagonist (V1A, V2) indicated for euvolemic (dilutional) and hypervolemic hyponatremia. Increases urine output of mostly free water, with little electrolyte loss.
Tolvaptan (Samsca)
Selective vasopressin V2 -receptor antagonist. Indicated for hypervolemic and euvolemic hyponatremia (ie, serum sodium level < 125 mEq/L) or less marked hyponatremia that is symptomatic and has resisted correction with fluid restriction. Used for hyponatremia associated with congestive heart failure, liver cirrhosis, and syndrome of inappropriate antidiuretic hormone secretion. Initiate or reinitiate in hospital environment only.
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