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Hyponatremia

Summer Chavez, MPM, MPH, DO Reviewed 05/2023
 


BASICS

DESCRIPTION

  • Hyponatremia is a plasma sodium (Na+) concentration of ≤135 mEq/L.

  • Hyponatremia itself does not provide information about the total body water (TBW) state of the patient. Patients wit...

DIAGNOSIS

  • Symptoms are related to the rate of fall in serum Na+, onset, and degree of hyponatremia (1)[C]], (3)[C].

  • Acute (≤48 hours): no time for full adaptation, more likely to present with moderate...

TREATMENT

GENERAL MEASURES

  • Assess all medications patient is taking.

  • Institute seizure precautions.

  • Institute fluid restriction for hypervolemic patients.

  • Fluid resuscitation in hypovolemic patients. Indi...

ONGOING CARE

DIET

  • Euvolemic hyponatremia: Restrict water to 1-1.5 L/day.

  • Hypervolemic hyponatremia: water and Na+ restriction

PROGNOSIS

  • In hospitalized patients, hyponatremia is associated with an elevate...

REFERENCES

1
Rondon-Berrios  H, Agaba  EI, Tzamaloukas  AH. Hyponatremia: pathophysiology, classification, manifestations and management. Int Urol Nephrol.  2014;46(11):215...

SEE ALSO

Algorithm: Hyponatremia 

CODES

ICD10

  • E87.1 Hypo-osmolality and hyponatremia

SNOMED

  • 237844003 Drug-induced hyponatremia

  • 237842004 Hyponatremia with decreased serum osmolality

  • 267447008 Hypo-osmolality and or hyponatremia

  • 74185008 Hy...

CLINICAL PEARLS

  • Assess all medications patient is taking because many are associated with hyponatremia.

  • Alcohol-dependent individuals with vitamin deficiencies, elderly women taking thiazide diuretics,...

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