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Related Experiment Videos

Pyridoxine dependent epilepsy: a suggestive electroclinical pattern.

R Nabbout1, C Soufflet, P Plouin

  • 1Department of Neuropaediatrics, INSERM U 29 Université René Descartes, Hospital Saint Vincent de Paul, Paris, France.

Archives of Disease in Childhood. Fetal and Neonatal Edition
|August 17, 1999
PubMed
Summary

Pyridoxine-dependent epilepsy has a distinct EEG pattern aiding early diagnosis. This condition is likely underdiagnosed, highlighting the need for improved recognition and testing.

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Area of Science:

  • Pediatric Neurology
  • Epileptology
  • Clinical Neurophysiology

Background:

  • Pyridoxine-dependent epilepsy (PDE) is a rare genetic disorder characterized by intractable seizures in neonates.
  • Early diagnosis and treatment with pyridoxine (vitamin B6) are crucial to prevent severe neurological deficits.

Purpose of the Study:

  • To identify a specific electroencephalographic (EEG) pattern indicative of pyridoxine-dependent epilepsy.
  • To assess the potential of EEG findings for improving early diagnosis of PDE.

Main Methods:

  • Retrospective analysis of clinical records and EEG data from neonates diagnosed with pyridoxine-dependent seizures between 1983 and 1994.
  • Inclusion criteria: seizures onset within 28 days of life; exclusion criteria: later onset.
  • Study included five patients from four families with follow-up ranging from 2 to 10 years.

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Main Results:

  • Neonates presented with hypotonia, decreased visual alertness, agitation, irritability, jitteriness, hyperalertness, sleeplessness, and startle reactions.
  • Seizure onset varied from 30 minutes to 3 days of life.
  • EEG revealed various seizure types, burst-suppression patterns (3/5), continuous/discontinuous patterns (2/5), and bilateral high-voltage delta slow wave activity (4/5). Severe to mild psychomotor delay was observed in all patients.

Conclusions:

  • An identifiable EEG pattern strongly suggests pyridoxine-dependent epilepsy.
  • Pyridoxine-dependent epilepsy is likely underdiagnosed, emphasizing the need for increased clinical awareness and diagnostic testing.