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Hyponatremia during therapy with amiodarone.

M Odeh1, E Schiff, A Oliven

  • 1Department of Internal Medicine B, Bnai Zion Medical Center, and Technion Faculty of Medicine, Israel Institute of Technology, Haifa.

Archives of Internal Medicine
|November 26, 1999
PubMed
Summary

A rare case of severe hyponatremia, a dangerous drop in sodium levels, was linked to amiodarone, a heart medication. This condition, syndrome of inappropriate antidiuretic hormone secretion (SIADH), resolved after stopping the drug.

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Area of Science:

  • Endocrinology
  • Cardiology
  • Pharmacology

Background:

  • Amiodarone is a widely used antiarrhythmic medication.
  • Syndrome of Inappropriate Antidiuretic Hormone secretion (SIADH) is a common cause of hyponatremia.
  • Drug-induced SIADH is a recognized but uncommon adverse effect.

Observation:

  • An elderly woman developed severe symptomatic hyponatremia during amiodarone therapy.
  • The patient's condition was diagnosed as SIADH.
  • No other potential causes for SIADH were identified.

Findings:

  • The patient's hyponatremia resolved completely after amiodarone discontinuation.
  • The electrolyte abnormality did not recur during a 6-month follow-up period.
  • This represents only the second reported case of amiodarone-induced SIADH in the medical literature.

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Implications:

  • Clinicians should consider amiodarone as a potential cause of SIADH in patients presenting with hyponatremia.
  • Early recognition and drug withdrawal are crucial to prevent severe neurologic complications and mortality associated with hyponatremia.
  • This case highlights the importance of monitoring electrolyte balance in patients receiving amiodarone.