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Neonatal vitamin-responsive epileptic encephalopathies

Sidney M Gospe1

  • 1Departments of Neurology and Pediatrics, the Center on Human Development and Disability, University of Washington, Seattle, WA, USA. sgospe@uw.edu

Chang Gung Medical Journal
|February 27, 2010
PubMed

Insights

Certain rare metabolic disorders cause neonatal seizures resistant to standard treatment. Early diagnosis and treatment with specific vitamins like pyridoxine or folinic acid are crucial for better outcomes in these vitamin-responsive epileptic encephalopathies.

Area of Science:

  • Biochemistry
  • Genetics
  • Neonatal Neurology

Background:

  • Neonatal seizures often require anticonvulsants but can be refractory, leading to poor outcomes.
  • Rare vitamin-responsive inborn errors of metabolism can mimic neonatal encephalopathy with intractable seizures.

Purpose of the Study:

  • To review current understanding of three neonatal vitamin-responsive epileptic encephalopathies.
  • To propose a diagnostic and treatment protocol for these conditions.

Main Methods:

  • Literature review of pyridoxine-dependent seizures (ALDH7A1 deficiency), folinic acid-responsive seizures, and pyridoxal phosphate-dependent seizures (PNPO deficiency).

Main Results:

  • Pyridoxine-dependent seizures require pharmacologic pyridoxine (vitamin B6) with lifelong therapy, though developmental handicaps are common.
  • Folinic acid-responsive seizures are treated with folinic acid and may also involve antiquitin deficiency.
  • Pyridoxal phosphate-dependent seizures respond to pyridoxal phosphate, not pyridoxine.

Conclusions:

  • Early consideration of vitamin-responsive disorders is vital for encephalopathic newborns with seizures.
  • Specific vitamin supplementation is key for treating these rare metabolic epilepsies.
  • A proposed diagnostic and treatment protocol aims to improve management of these conditions.

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