Atonic seizure

Other names: Akinetic seizure, astatic seizure
Multiple recurrent injuries on head following drop attacks

An atonic seizure (also called drop seizure, akinetic seizure, astatic seizure, or drop attack) is a type of seizure that consists of partial or complete loss of muscle tone that is caused by temporary alterations in brain function. These seizures are brief – usually less than fifteen seconds. They usually begin in childhood and may persist into adulthood. The seizure itself causes no physical injury, but the loss of control, predominantly in trunk muscles, can result in direct injury from falling. Electroencephalography can be used to confirm diagnosis. It is rare and can be indicative of Lennox–Gastaut syndrome (see Henri Gastaut).

Atonic seizures can occur while standing, walking, or sitting, and are often noticeable by a head drop (relaxing of the neck muscles). Fall injuries may result in impact to the face or head. As with common epileptic occurrences, no first aid is needed post-seizure, except in the instances where falling injuries have occurred. In some cases, a person may become temporarily paralyzed in part of his or her body. This usually does not last longer than 3 minutes.[1][citation needed]

There is no general treatment for patients with a seizure disorder. Each treatment plan is specifically tailored to the individual patient based on their diagnosis and symptoms. Treatment options may include medical therapy, nerve stimulation, dietary therapy, or surgery, as appropriate. Clinical trials may also be a valuable treatment alternative. Usually, anticonvulsants are given based on other symptoms and / or associated problems. Because the areas of the cerebellum which determine increases and decreases in muscle tone are close together, people experiencing atonic seizures are most likely experiencing myoclonic ones too, at some point. This may play a role in therapy and diagnostic.[2]One surgical approach, selective posterior callostomy, can greatly decrease instances of drop attacks and improve function and behavior in patients with intellectual disability.[3]

## References[edit | edit source]

1. ↑ "Atonic Seizures". Epilepsy Foundation. Archived from the original on 2019-03-30. Retrieved 2019-09-13.
2. ↑ "Atonic Seizure - Types of Seizures - The Johns Hopkins Epilepsy Center". Archived from the original on 2012-08-16. Retrieved 2012-08-18.
3. ↑ Paglioli, Eliseu; Martins, William Alves; Azambuja, Ney; Portuguez, Mirna; Frigeri, Thomas More; Pinos, Larissa; Saute, Ricardo; Salles, Cora; Hoefel, João Rubião (2016-11-08). "Selective posterior callosotomy for drop attacks: A new approach sparing prefrontal connectivity". Neurology. 87 (19): 1968–1974. doi:10.1212/WNL.0000000000003307. ISSN 1526-632X. PMID 27733569. S2CID 24541945.

## External links[edit | edit source]

Classification|

* ICD-10: G40.3
* MeSH: D004832

|

* v
* t
* e

Seizures and epilepsy (G40–G41, 345)

Basics|

* Seizure types
* Aura (warning sign)
* Postictal state
* Epileptogenesis
* Neonatal seizure
* Epilepsy in children

Treatments|

* Anticonvulsants
* Electroencephalography (diagnosis method)
* Epileptologist

Personal issues|

* Epilepsy and driving
* Epilepsy and employment

Seizure types
Epilepsy types|

| Focal|

Seizures
Simple partial
Complex partial
Gelastic seizure

Epilepsy
Temporal lobe epilepsy
Frontal lobe epilepsy
Rolandic epilepsy
Nocturnal epilepsy
Panayiotopoulos syndrome

|

Generalised|

* Tonic–clonic
* Absence seizure
* Atonic seizure
* Automatism
* Benign familial neonatal epilepsy
* Lennox–Gastaut
* Doose syndrome
* West

Status epilepticus|

* Epilepsia partialis continua
* Complex partial status epilepticus

Myoclonic
epilepsy|

* Progressive myoclonus epilepsies
* Dentatorubral–pallidoluysian atrophy
* Unverricht–Lundborg disease
* MERRF syndrome
* Lafora disease
* Juvenile myoclonic epilepsy

Non-epileptic
seizures|

* Febrile seizure
* Psychogenic non-epileptic seizures

Related
disorders|

* Sudden unexpected death in epilepsy
* Todd's paresis
* Landau–Kleffner syndrome
* Epilepsy in animals

Epilepsy
organizations|

* Citizens United for Research in Epilepsy
* Epilepsy Action
* Epilepsy Action Australia
* Epilepsy Foundation (USA)
* Epilepsy Outlook (UK)
* Epilepsy Research UK
* Epilepsy Society

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