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Epilepsy: Atonic Seizures - Topic Overview

An atonic seizure is a sudden loss of muscle tone in the muscles that hold the body and head upright.

  • The seizure occurs without warning and usually causes the person to fall down.
  • Some atonic seizures may be more limited, only causing the person's head to drop for a moment.

Atonic seizures are fairly uncommon and occur mostly in people with Lennox-Gastaut syndrome. This is a severe form of generalized epilepsy that begins in early childhood. (Children with Lennox-Gastaut syndrome may also have tonic seizures.)

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People who have atonic or tonic seizures are likely to be injured when they fall. Children may have to wear helmets and restrict their activities to prevent serious injury.

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WebMD Medical Reference from Healthwise

Last Updated: August 26, 2011
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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