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convulsion (kәn-vul�shәn) a type of seizure consisting of a series of involuntary contractions of the voluntary muscles. Besides those occurring in epilepsy, convulsions can also be caused by chemical or hormonal imbalances in the blood; metabolic disturbances; injury to the brain such as from head injury, a tumor, or stroke; or numerous other causes such as infection, high fever, or cerebral edema.

clonic convulsion a convulsion marked by clonus.

febrile convulsion febrile seizure.

tetanic convulsion a tonic spasm without loss of consciousness and often associated with hypocalcemia. See also tetany.

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