Cataplexy

**Definition:** 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)

**Tree numbers:** - C10.886.425.800.200.750.500 - F03.870.400.800.200.750.500

**Synonyms:** - Henneberg Syndrome - Tonelessness Syndrome - Cataleptic Attacks