Hyponatremia in Emergency Medicine Medication

  • Author: Sandy Craig, MD; Chief Editor: Erik D Schraga, MD   more...
 
Updated: Apr 13, 2010
 

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.

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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.

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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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Contributor Information and Disclosures
Author

Sandy Craig, MD  Residency Program Director, Carolinas Medical Center; Associate Professor, Department of Emergency Medicine, University of North Carolina at Chapel Hill School of Medicine

Sandy Craig, MD is a member of the following medical societies: Alpha Omega Alpha and Society for Academic Emergency Medicine

Disclosure: Nothing to disclose.

Specialty Editor Board

Erik D Schraga, MD  Staff Physician, Department of Emergency Medicine, Mills-Peninsula Emergency Medical Associates

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD  Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment

Howard A Bessen, MD  Professor of Medicine, Department of Emergency Medicine, University of California, Los Angeles, David Geffen School of Medicine; Program Director, Harbor-UCLA Medical Center

Howard A Bessen, MD is a member of the following medical societies: American College of Emergency Physicians

Disclosure: Nothing to disclose.

John D Halamka, MD, MS  Associate Professor of Medicine, Harvard Medical School, Beth Israel Deaconess Medical Center; Chief Information Officer, CareGroup Healthcare System and Harvard Medical School; Attending Physician, Division of Emergency Medicine, Beth Israel Deaconess Medical Center

John D Halamka, MD, MS is a member of the following medical societies: American College of Emergency Physicians, American Medical Informatics Association, Phi Beta Kappa, and Society for Academic Emergency Medicine

Disclosure: Nothing to disclose.

Chief Editor

Erik D Schraga, MD  Staff Physician, Department of Emergency Medicine, Mills-Peninsula Emergency Medical Associates

Disclosure: Nothing to disclose.

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