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Related Experiment Videos

Congenital hyperekplexia: five sporadic cases.

Serge Rivera1, Frédéric Villega, Anne de Saint-Martin

  • 1Service de Réanimation Néonatale, Pédiatrie 2, Hôpitaux Universitaires de Strasbourg, 1 avenue Molière, 67098 Strasbourg, France. Serge.RIVERA@chru-strasbourg.fr

European Journal of Pediatrics
|October 8, 2005
PubMed
Summary

Hyperekplexia, or startle disease, causes exaggerated reflexes and apnea in newborns. Early clinical diagnosis is crucial for prompt treatment with clonazepam, improving outcomes.

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Area of Science:

  • Neurology
  • Genetics
  • Pediatrics

Background:

  • Hyperekplexia, also known as startle disease, is a rare neurological disorder.
  • It is characterized by an exaggerated startle reflex and tonic seizures in neonates.

Observation:

  • Sporadic cases present with severe neonatal hypertonicity and paroxysmal tonic manifestations.
  • Triggers include loud sounds, tactile stimuli, or nasal percussion, leading to excessive jerking.
  • Affected neonates face risks of apnea and sudden death.

Findings:

  • Diagnosis is primarily clinical, based on characteristic symptoms.
  • A genetic link is identified in the dominant form, involving the GLRA1 gene on chromosome 5.
  • Clonazepam demonstrates efficacy in reducing symptom severity.

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Implications:

  • Early diagnosis and intervention are critical for managing hyperekplexia.
  • The condition typically improves after infancy with normal psychomotor development.
  • Consider hyperekplexia in neonates with unexplained tonic attacks and hypertonicity.