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Paeds Casesrespiratory-sleep-and-airway

Paeds Cases · respiratory-sleep-and-airway

Narcolepsy and hypersomnolence — structured clinical encounter

Structured encounter testing the approach to a school-aged child with three months of irresistible daytime sleepiness who loses muscle tone in the head and knees when laughing and has gained weight rapidly: the recognition of cataplexy and narcolepsy type 1, the exclusion of secondary sleepiness, the confirmatory polysomnography, multiple sleep latency test and cerebrospinal fluid orexin, the layered management of sleepiness and cataplexy, the monitoring, and the conversation with the family about a lifelong condition and its impact on school and safety.

structured clinical encounter2 min readVerification in progress

Target exams

RACP General PaediatricsRACP DCEMRCPCH ClinicalRCPSC Pediatrics
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Target exams

RACP General PaediatricsRACP DCEMRCPCH ClinicalRCPSC Pediatrics
Prompt
A ten-year-old boy has three months of irresistible daytime sleepiness, falling asleep in class despite adequate night-time sleep, and his knees buckle and head drops for a second or two when he laughs, with preserved awareness. He has gained weight rapidly over the same period. You are the paediatric registrar working through the diagnosis, confirmation, management and counselling.

Station 1 — recognition

Asked for my first impression, I explain that a previously well child with three months of irresistible daytime sleepiness who loses muscle tone in the head and knees when he laughs, while staying fully aware, has cataplexy, and cataplexy is nearly specific for narcolepsy type 1. The rapid weight gain fits the hypothalamic involvement typical of paediatric narcolepsy, so I would treat this as narcolepsy type 1 until proven otherwise. [2] [9]

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References14ShowHide
  1. [1]Morse AM; Kim SY; Harris S; et al Narcolepsy: Beyond the Classic Pentad. CNS Drugs, 2025.PMID 40111737
  2. [2]Rocca FL; Pizza F; Ricci E; et al Narcolepsy during Childhood: An Update. Neuropediatrics, 2015.PMID 25961600
  3. [3]Barateau L; Pizza F; Chenini S; et al Narcolepsies, update in 2023. Rev Neurol (Paris), 2023.PMID 37634997
  4. [4]Rauf R; Asif S; AlSaafeen A; et al Orexin Deficiency in Narcolepsy: Molecular Mechanisms, Clinical Phenotypes, and Emerging Therapeutic Frontiers. Brain Behav, 2025.PMID 41076550
  5. [5]Vassalli A; Tafti M; Liblau RS Narcolepsy is (not) an autoimmune disease. Nat Rev Neurol, 2026.PMID 42321519
  6. [6]Ding WT; Gao JY; Guo ZL; et al Research Progress in the Roles of Influenza A H1N1 Virus and Its Vaccine in the Pathogenesis of Narcolepsy Type 1. Zhongguo Yi Xue Ke Xue Yuan Xue Bao, 2025.PMID 41503654
  7. [7]Poli F; Pizza F; Mignot E; et al High prevalence of precocious puberty and obesity in childhood narcolepsy with cataplexy. Sleep, 2013.PMID 23372264
  8. [8]Dhanju S; Al-Saleh S; Amin R; et al A retrospective analysis of clinical characteristics of childhood narcolepsy. Paediatr Child Health, 2018.PMID 30455579
  9. [9]Pillen S; Pizza F; Dhondt K; et al Cataplexy and Its Mimics: Clinical Recognition and Management. Curr Treat Options Neurol, 2017.PMID 28478511
  10. [10]Biscarini F; Vandi S; Zenesini C; et al Use of Portable 24-Hour Polysomnography as Alternative Diagnostic Tool for Narcolepsy Type 1 in Adults and Children. Neurology, 2025.PMID 40080737
  11. [11]Tang SH; Min J; Zhang X; et al Incidence of pediatric narcolepsy diagnosis and management: evidence from claims data. J Clin Sleep Med, 2024.PMID 38450539
  12. [12]Keam SJ Pitolisant: Pediatric First Approval. Paediatr Drugs, 2023.PMID 37233887
  13. [13]Moresco M; Pizza F; Antelmi E; et al Sodium Oxybate Treatment in Pediatric Type 1 Narcolepsy. Curr Drug Metab, 2018.PMID 29512449
  14. [14]Dauvilliers Y; Lammers GJ; Lecendreux M; et al Effect of sodium oxybate on body mass index in pediatric patients with narcolepsy. J Clin Sleep Med, 2024.PMID 37942930
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