http://www.fpnotebook.com/

Hypoosmolar Hyponatremia

See Also
1. Hyponatremia
Definition
1. Hyponatremia with Measured Serum Osmolality <280 mOsm
Approach
1. Assess Extracellular Fluid Volume
  1. Orthostatic Blood Pressure and Pulse
  2. Skin turgor
  3. Edema
2. What is Patient's Volume Status?
  1. Hypervolemic Hypoosmolar Hyponatremia
  2. Non-Hypervolemic (Iso- or Hypovolemic)
    1. Difficult to distinguish Iso- from Hypovolemic
    2. Hypovolemic Hypoosmolar Hyponatremia
    3. Isovolemic Hypoosmolar Hyponatremia
3. Obtain Urine Sodium
  1. Differentiate renal from extrarenal cause
Management
1. See Hyponatremia Management
2. See specific protocols based on fluid status above
References
1. Kone in Tisher (1993) Nephrology, p. 87-100
2. Levinsky in Wilson (1991) Harrison's IM, p. 281-84
3. Rose (1989) Acid-Base and Electrolytes, p. 601-38

Navigation Tree

Please see the Terms and Conditions. Please also see the privacy statement regarding advertising on this page. Although access to this page is not restricted, the information found here is intended for use by medical providers. Patients should address specific medical concerns with their physicians.

This page was written by Scott Moses, MD. This page was last revised before 5/10/08, prior to consistent tracking of revision date. This page was last published on 6/1/2008. Please send comments and questions to the editor. Contact information may be found on the page About the Family Practice Notebook. These pages are best viewed with Microsoft Internet Explorer 6.0.