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cataplexy
cat·a·plex·y C0155500 (kăt′ə-plĕk′sē)n. pl. cat·a·plex·ies A sudden loss of muscle tone and strength, usually caused by an extreme emotional stimulus.
[From Greek kataplēxis, fixation (of the eyes), from kataplēssein, to astound, terrify : kata-, intensive pref.; see cata- + plēssein, plēk-, to strike; see plāk- in Indo-European roots.]
cat′a·plec′tic (-plĕk′tĭk) adj.cataplexy (ˈkætəˌplɛksɪ) n1. (Pathology) sudden temporary paralysis, brought on by severe shock2. (Zoology) a state of complete absence of movement assumed by animals while shamming death[C19: from Greek kataplēxis amazement, from kataplēssein to strike down (with amazement), confound, from kata- down + plēssein to strike] ˌcataˈplectic adjcataplexya temporary paralytic or hypnotic state, often brought on by strong emotion. — cataplectic, adj.See also: NervesTranslationscataplexy
cataplexy[′kad·ə‚plek·sē] (medicine) Sudden loss of muscle tone provoked by exaggerated emotion, such as excessive anger or laughter, often associated with a profound desire for sleep. Prostration by the sudden onset of disease. Hypnotic sleep. cataplexy
cataplexy [kat´ah-plek″se] a condition, often associated with narcolepsy; marked by abrupt attacks of muscular weakness and hypotonia triggered by an emotional stimulus, such as mirth, anger, or fear. adj., adj cataplec´tic.cat·a·plex·y (kat'ă-plek'sē), A transient attack of extreme generalized weakness, often precipitated by an emotional response, such as surprise, fear, or anger; one component of the narcolepsy quadrad. [cata- + G. plēxis, a blow, stroke] cataplexy (kăt′ə-plĕk′sē)n. pl. cataplex·ies A sudden loss of muscle tone and strength, usually caused by an extreme emotional stimulus.
cat′a·plec′tic (-plĕk′tĭk) adj.A rare—1:2,000—condition characterised by recurrent episodes of abrupt decrease/loss of muscle tone either limited to muscle groups, or generalized, leading to muscle weakness, paralysis or postural collapse; cataplexy in an awake person is pathognomonic of narcolepsy, and is triggered by emotional stimuli or stress, which may cause knee-buckling; cataplectic attacks are dangerous for machinists, house painters, construction workers
Precipitating factors Outburst of emotion, strenuous physical exercise, flashes of light. It may present as a side effect of SSRI discontinuation syndrome
Diagnosis Flat EMG potentials, loss of tendon reflexes during an attack, eye movements similar to those of REM sleep, REM sleep pattern immediately on falling asleep
Management Imipramine, protripyline, IMAOscataplexy Neurology An abrupt ↓/loss of muscle tone either limited to muscle groups, or generalized, leading to muscle weakness, paralysis or postural collapse; cataplexy in an awake person is pathognomonic of narcolepsy, and is triggered by emotional stimuli or stress, which may cause knee-buckling; cataplectic attacks are dangerous for machinists, house painters, construction workers Management Imipramine, protripyline, IMAOs. See Narcolepsy. cat·a·plex·y (kat'ă-plek-sē) A transient attack of extreme generalized muscular weakness, often precipitated by an emotional state such as laughing, surprise, fear, or anger. [cata- + G. plēxis, a blow, stroke]cataplexy The momentary paralysis, or weakness of the limbs, that sometimes affects people surprised by a strong emotion such as, anger, fear, jealousy, happiness or hilarity.cataplexy a human nervous condition in which individuals suddenly collapse to the ground without loss of consciousness. It can be induced by strong emotion.CataplexyA symptom of narcolepsy in which there is a sudden episode of muscle weakness triggered by emotions. The muscle weakness may cause the person's knees to buckle, or the head to drop. In severe cases, the patient may become paralyzed for a few seconds to minutes.Mentioned in: Narcolepsy, Sleep Disorders |