A condition characterized by transient weakness or paralysis of somatic musculature triggered by an emotional stimulus or physical exertion. cataplexy is frequently associated with narcolepsy. During a cataplectic attack, there is a marked reduction in muscle tone similar to the normal physiologic hypotonia that accompanies rapid eye movement sleep (sleep, rem). (From Adams et al., Principles of neurology, 6th ed, p396)


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