Cataplexy vs. Catatonia



(medicine) An abrupt loss of muscle tone, sometimes associated with narcolepsy.


A severe psychiatric condition, often associated with schizophrenia, characterized by a tendency to remain in a rigid state of stupor for long periods which give way to short periods of extreme agitation.


A morbid condition caused by an overwhelming shock or extreme fear and marked by rigidity of the muscles.


an abnormal behavioral syndrome characterized by stupor, negativism, and muscular rigidity, sometimes alternating with purposeless excitement, and seen most frequently in schizophrenia; called also catatonic schizophrenia.


Cataplexy is a sudden and transient episode of muscle weakness accompanied by full conscious awareness, typically triggered by emotions such as laughing, crying, or terror. Cataplexy affects approximately 70% of people who have narcolepsy, and is caused by an autoimmune destruction of hypothalamic neurons that produce the neuropeptide hypocretin (also called orexin), which regulates arousal and has a role in stabilization of the transition between wake and sleep states.


extreme tonus; muscular rigidity; a common symptom in catatonic schizophrenia


a form of schizophrenia characterized by a tendency to remain in a fixed stuporous state for long periods; the catatonia may give way to short periods of extreme excitement


Catatonia is a neuropsychiatric behavioral syndrome that is characterized by abnormal movements, immobility, abnormal behaviors, and withdrawal. The onset of catatonia can be acute or subtle and symptoms can wax, wane, or change during episodes.

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