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Related Experiment Videos

Cyclic alternating pattern (CAP) alterations in narcolepsy.

Mario Giovanni Terzano1, Arianna Smerieri, Alessandra Del Felice

  • 1Department of Neuroscience, Sleep Disorders Center, University of Parma, Via Gramsci, 14, 43100 Parma, Italy. mterzano@unipr.it

Sleep Medicine
|June 3, 2006
PubMed
Summary
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Narcolepsy patients exhibit reduced cyclic alternating pattern (CAP) during non-rapid eye movement (NREM) sleep, suggesting decreased arousal. This finding may explain excessive sleepiness in narcolepsy.

Area of Science:

  • Sleep Medicine
  • Neurophysiology

Background:

  • Narcolepsy is a sleep disorder characterized by reduced arousal system activation.
  • Cyclic alternating pattern (CAP) reflects arousability during non-rapid eye movement (NREM) sleep.

Purpose of the Study:

  • To investigate cyclic alternating pattern (CAP) parameters in narcoleptic patients with cataplexy.
  • To compare CAP, arousals, and sleep measures between narcoleptic patients and healthy controls.

Main Methods:

  • Polysomnography (PSG) and multiple sleep latency test (MSLT) were performed on 25 drug-naive narcoleptic patients and 25 controls.
  • Sleep cycles were analyzed, including classification of CAP A phases (A1, A2, A3).

Main Results:

  • Narcoleptic patients showed increased wake time after sleep onset and reduced REM latency.

Related Experiment Videos

  • Arousal index was similar between groups, but CAP time, CAP rate, and number of CAP cycles were significantly reduced in narcoleptics.
  • Specific CAP A phase subtypes, particularly A1, were also reduced in narcoleptic patients.

    • Conclusions:

    • Reduced CAP in narcolepsy may indicate generally decreased arousability or stronger sleep-promoting forces.
    • This electroencephalographic (EEG) finding could explain narcolepsy symptoms like excessive sleepiness and impaired attention.
    • The results suggest reduced arousal, not necessarily sleep fragmentation, underlies some narcolepsy manifestations.