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[Narcolepsy, from Westphal to hypocretin].

Yves Dauvilliers1, Bertrand Carlander, Michel Billiard

  • 1Faculté de médecine, Hôpital Gui de Chauliac, Montpellier.

Presse Medicale (Paris, France : 1983)
|February 3, 2005
PubMed
Summary

Narcolepsy, a neurological disorder, affects sleep with symptoms like excessive daytime sleepiness and cataplexy. Diagnosis involves specific tests, and treatments target sleepiness, muscle tone loss, and sleep disturbances.

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Area of Science:

  • Neurology
  • Sleep Medicine
  • Immunology

Context:

  • Narcolepsy is an underdiagnosed neurological disorder with a prevalence of 25-35 per 100,000.
  • Symptoms include irresistible sleep episodes, cataplexy, hallucinations, sleep paralysis, and disturbed nocturnal sleep.
  • Onset typically occurs in the second decade of life, but can range from childhood to fifties.

Purpose:

  • To review the diagnosis, pathophysiology, and treatment of narcolepsy.
  • To highlight key findings in narcolepsy research over the last twenty years.
  • To discuss current and future therapeutic strategies.

Summary:

  • Diagnosis relies on identifying cardinal symptoms and confirmed by polysomnography, HLA typing (DQB1*0602 association), and CSF hypocretin-1 levels.
  • Pathophysiology research benefits from canine models, revealing hypocretin deficiency in 90% of patients and a hypocretin receptor 2 mutation.
  • Narcolepsy involves distinct pharmacological controls for sleepiness (dopaminergic) and cataplexy (noradrenergic).

Impact:

  • Recent findings include a strong HLA DQB1*0602 association and hypocretin deficiency, suggesting potential autoimmune mechanisms.
  • Current treatments include modafinil for sleepiness, antidepressants or sodium oxybate for cataplexy, and hypnotics for sleep disturbances.
  • Future research focuses on hypocretin agonists and immunosuppressors for narcolepsy management.

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