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Cyclosporine A neurotoxicity in a patient with idiopathic renal magnesium wasting

A K Al-Rasheed1, S I Blaser, B A Minassian

  • 1Division of Neurology, Department of Pediatrics, Hospital for Sick Children and University of Toronto, Toronto, Ontario, Canada.

Pediatric Neurology
|November 9, 2000
PubMed

Insights

A child with Gitelman syndrome experienced severe neurotoxicity from cyclosporine A after a heart transplant. Stopping the drug rapidly improved her neurological symptoms, highlighting a critical drug interaction.

Area of Science:

  • Pediatric Nephrology
  • Neuroscience
  • Transplant Medicine

Background:

  • Gitelman syndrome is a genetic disorder causing renal salt wasting and magnesium loss.
  • Cyclosporine A is an immunosuppressant commonly used post-transplant but known for potential neurotoxicity.
  • Drug interactions and pre-existing conditions can significantly alter drug efficacy and safety profiles.

Observation:

  • A pediatric heart transplant recipient presented with acute encephalopathy, seizures, and quadriparesis.
  • Neuroimaging revealed extensive bilateral cortical involvement.
  • The patient had suspected Gitelman syndrome, leading to idiopathic renal magnesium wasting.

Findings:

  • Cyclosporine A neurotoxicity was strongly suspected as the cause of the severe neurological symptoms.
  • Discontinuation of cyclosporine A led to rapid and dramatic clinical improvement, including seizure freedom and improved consciousness.
  • The patient's neurological deficits resolved significantly within six weeks, with full ambulation achieved.

Implications:

  • This case highlights the potential for severe neurotoxicity from cyclosporine A in patients with magnesium-wasting nephropathies like Gitelman syndrome.
  • Caution is advised when using cyclosporine A in transplant recipients with pre-existing magnesium homeostasis disorders.
  • This is the first reported case of concurrent cyclosporine neurotoxicity and magnesium-wasting nephropathy, underscoring the need for careful monitoring of electrolytes and neurological status.

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