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Related Experiment Videos

Hyperekplexia and sudden neonatal death.

M A Nigro1, H C Lim

  • 1Department of Neurology, Wayne State University School of Medicine, Detroit, Michigan.

Pediatric Neurology
|May 1, 1992
PubMed
Summary

Hyperekplexia in newborns causes apnea and startle responses. Early recognition and treatment with clonazepam can prevent serious apneic episodes and improve outcomes.

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Area of Science:

  • Neonatal Neurology
  • Clinical Genetics

Background:

  • Hyperekplexia is a rare neurological disorder.
  • Characterized by exaggerated startle responses and apnea.

Observation:

  • Neonatal onset with spontaneous apnea and feeding difficulties.
  • Hyperekplexic startle response to nose tapping observed after 24 hours.
  • Apnea persisted until 1 year in untreated infants; 3/15 died neonatally.

Findings:

  • Clonazepam treatment (0.1-0.2 mg/kg/day) effectively reduced apneic episodes and startle reflexes.
  • Electroencephalographic studies were consistently normal.
  • Benzodiazepine efficacy suggests a central nervous system reflex etiology.

Implications:

  • Hyperekplexia should be considered in neonates with apnea, muscular rigidity, or near-miss SIDS.
  • Routine newborn examination should include assessment for hyperekplexic startle response.
  • Immediate monitoring and clonazepam initiation are crucial for at-risk infants.

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