convulsion

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convulsion,

sudden, violent, involuntary contraction of the muscles of the body, often accompanied by loss of consciousness. It is not known what causes the abnormal impulses from the brain that result in convulsive seizures, since the disturbance may arise in normal brain tissue as well as in diseased or injured tissue. Convulsions may occur in such conditions as epilepsy, poisoning, high fever (especially in young children), disturbances of calcium or phosphorus metabolism, alkalosis, diabetes, oxygen insufficiency, and a low blood-sugar content, as well as in local irritation or injury of the brain. Persons undergoing convulsions should be guarded against self-injury (see epilepsyepilepsy,
a chronic disorder of cerebral function characterized by periodic convulsive seizures. There are many conditions that have epileptic seizures. Sudden discharge of excess electrical activity, which can be either generalized (involving many areas of cells in the brain)
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). Otherwise, treatment must be directed to the underlying cause.

convulsion

[kən′vəl·shən]
(medicine)
An episode of involuntary, generally violent muscular contractions, rhythmically alternated with periods of relaxation; associated with many systematic and neurological diseases.

convulsion

a violent involuntary contraction of a muscle or muscles
References in classic literature ?
So sudden and violent was the fit that the unfortunate prisoner was unable to complete the sentence; a violent convulsion shook his whole frame, his eyes started from their sockets, his mouth was drawn on one side, his cheeks became purple, he struggled, foamed, dashed himself about, and uttered the most dreadful cries, which, however, Dantes prevented from being heard by covering his head with the blanket.
Groans, and convulsions, and a discolored face, and friends weeping, and blacks, and obsequies, and the like, show death terrible.
However, as the woman seemed likely to die with the convulsions that were tearing her, they concluded that the third could do no more than put her out of her misery with a happy dispatch.
It had spared him the tortures of the agony, convulsions of the last departure; had opened with an indulgent finger the gates of eternity to that noble soul.
When the last convulsions of the body, which the spirit was leaving, occurred, Princess Mary and Natasha were present.
They may constitute the link between ape and man, all traces of which have been swallowed by the countless convulsions which have racked the outer crust, or they may be merely the result of evolution along slightly different lines--either is quite possible.
Young Lady Montbarry suddenly turned aside, and put her handkerchief over her mouth in convulsions of suppressed laughter.
Inglethorp was lying on the bed, her whole form agitated by violent convulsions, in one of which she must have overturned the table beside her.
She had been taken with a sudden fright, my mistress said, and master he told us she was in a fit of convulsions.
While this dumb convulsion lasted I could only watch it-- which I did the more intently when I saw Flora's face peep at me over our companion's shoulder.
Miss Marrable sank back in the arm-chair, and gave way to the second convulsion.
Ranges of mountains skirt this plain, and, in Captain Bonneville's opinion, were formerly connected, until rent asunder by some convulsion of nature.