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Narcolepsy Type 1 with Cataplexy

Hypocretin deficiency disorder with excessive daytime sleepiness and cataplexy attacks.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Nöroloji department. Book Appointment →

What is Narcolepsy Type 1 with Cataplexy?

Narcolepsy type 1 is defined by excessive daytime sleepiness for at least 3 months and either cataplexy with positive multiple sleep latency test or low CSF hypocretin-1 (orexin) level under 110 pg/mL.

It is caused by autoimmune destruction of hypocretin-producing neurons in the hypothalamus, often triggered by H1N1 influenza infection or vaccination in genetically susceptible individuals (HLA-DQB1*06:02).

Prevalence is 25-50 per 100,000; onset typically in adolescence or young adulthood, with significant diagnostic delay (5-15 years) common.

Symptoms

Excessive daytime sleepiness with irresistible sleep attacks lasting minutes
Cataplexy: sudden brief loss of muscle tone triggered by strong positive emotions (laughter, surprise), preserving consciousness
Sleep paralysis: temporary inability to move or speak when falling asleep or waking
Hypnagogic and hypnopompic hallucinations: vivid visual or auditory experiences at sleep-wake transitions
Disrupted nocturnal sleep with frequent awakenings
Automatic behaviour during periods of micro-sleep
Increased prevalence of obesity, depression, attention deficit and metabolic syndrome
Children may show motor activation, weight gain and complex facial expressions (cataplectic facies)

Risk Factors

HLA-DQB1*06:02 allele (present in over 95% of patients)
H1N1 influenza infection (2009 pandemic was associated with increased incidence)
Pandemrix H1N1 vaccination (specific Europe-only adjuvanted vaccine)
Family history (10 times higher risk in first-degree relatives)
Streptococcal infection has been investigated as a potential trigger
Autoimmune disorders may coexist (thyroid disease, type 1 diabetes)
Onset peaks in second and third decades of life

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Excessive daytime sleepiness for over 3 months interfering with work, school or driving warrants sleep medicine referral
  • Episodes of sudden muscle weakness with strong emotion suggest cataplexy and need urgent evaluation
  • Sleep attacks while driving or operating machinery require immediate restriction and assessment
  • New onset hypersomnia in children or adolescents, especially with weight gain or behavioural change, needs neurological assessment
  • Diagnostic confirmation requires polysomnography with multiple sleep latency test or CSF hypocretin measurement at a sleep disorders centre

Treatment Methods

01
Diagnostic workup: detailed sleep history, Epworth sleepiness scale, actigraphy
02
Polysomnography followed by multiple sleep latency test (mean sleep latency ≤8 minutes with ≥2 sleep-onset REM periods)
03
CSF hypocretin-1 measurement (under 110 pg/mL diagnostic of narcolepsy type 1)
04
Sleep hygiene: regular sleep schedule, planned brief naps (15-20 minutes), avoidance of alcohol and shift work
05
Wake-promoting agents: modafinil 100-400 mg daily (first line), armodafinil, methylphenidate, dextroamphetamine, solriamfetol, pitolisant
06
Cataplexy treatment: sodium oxybate (gamma-hydroxybutyrate, GHB) at bedtime and 4 hours later, low-sodium oxybate alternative
07
Selective serotonin or serotonin-noradrenaline reuptake inhibitors (venlafaxine, fluoxetine) for cataplexy as adjunct
08
Tricyclic antidepressants (clomipramine) for severe cataplexy
09
Patient and family education, support groups (Narcolepsy Network)
10
Driving safety assessment and workplace accommodations

Which Department to Visit?

You can visit our Nöroloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.