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Massive vasopressin-resistant polyuria induced by dexamethasone

M Toftegaard1, F Knudsen

  • 1Department of Anaesthesia and Intensive Care, Aalborg Hospital, Denmark.

Intensive Care Medicine
|March 1, 1995
PubMed
Summary

A rare case of severe polyuria, a condition of excessive urination, occurred after a standard dexamethasone dose in a patient with a brain tumor. This polyuria was resistant to vasopressin treatment.

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Area of Science:

  • Endocrinology
  • Nephrology
  • Neuro-oncology

Background:

  • Dexamethasone is a potent glucocorticoid used to manage cerebral edema in patients with brain tumors.
  • Polyuria, or excessive urination, can be a symptom of various endocrine and renal disorders, including diabetes insipidus.

Observation:

  • A 15-year-old female patient with a brain tumor developed massive polyuria (up to 1250 ml/hour) immediately after intravenous administration of a standard dose of dexamethasone (4 mg).
  • The induced polyuria was unresponsive to therapeutic doses of vasopressin, a hormone that regulates water reabsorption.

Findings:

  • This case presents the first reported instance of glucocorticoid-induced polyuria that is resistant to vasopressin in a human patient.
  • The patient's condition did not align with any previously identified causes of diabetes insipidus, suggesting a direct or indirect effect of dexamethasone.

Implications:

  • This finding highlights a potential, previously unrecognized adverse effect of dexamethasone, necessitating careful monitoring for polyuria in patients receiving this medication.
  • Further research is warranted to elucidate the precise mechanism of dexamethasone-induced, vasopressin-resistant polyuria and its clinical significance.

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