WordNet

a sudden occurrence (or recurrence) of a disease; "he suffered an epileptic seizure" (同)ictus, raptus
the taking possession of something by legal process
characterized by a lack of tonus
used of syllables; "an atonic syllable carries no stress" (同)unaccented

PrepTutorEJDIC

〈U〉〈C〉つかむ(つかまれる)こと / 〈U〉〈C〉強奪;差し押さえ;逮捕 / 〈C〉(病気・恐怖などが)襲うこと,発作

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/12/04 13:39:45」(JST)

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Atonic seizures (also called drop seizures, akinetic seizures or drop attacks), are a type of seizure that consist of a brief lapse in muscle tone that are caused by temporary alterations in brain function. The seizures are brief - usually less than fifteen seconds. They begin in childhood and may persist into adulthood. The seizure itself causes no damage, but the loss of muscle control can result in indirect damage 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 (the neck muscles relaxing) and damage sometimes results from hitting 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.

Treatment

There is no specific treatment for patients with a seizure disorder. Each treatment plan is 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 muscular tonus 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.^[1]

References

^ http://www.hopkinsmedicine.org/neurology_neurosurgery/specialty_areas/epilepsy/seizures/types/drop-attack-atonic-seizures.html

Information about Atonic Seizures from Epilepsy Foundation
Atonic Seizures : Epilepsy.com

Epilepsy Ontario :: Seizure Types :: Atonic Seizures

UpToDate Contents

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1. 小児痙攣およびてんかんの分類、病因、および臨床的特徴の概要 overview of the classification etiology and clinical features of pediatric seizures and epilepsy
2. 小児におけるてんかん症候群 epilepsy syndromes in children
3. 高齢患者における痙攣発作およびてんかん：病因、臨床像、および診断 seizures and epilepsy in the elderly patient etiology clinical presentation and diagnosis
4. 成人における初回痙攣発作の評価 evaluation of the first seizure in adults
5. 統合失調症に対するクロザピン投与のガイドライン guidelines for prescribing clozapine in schizophrenia

English Journal

Atonic phenomena in focal seizures: Nomenclature, clinical findings and pathophysiological concepts.

Kovac S, Diehl B.SourceInstitute of Neurology, National Hospital for Neurology and Neurosurgery, Queen Square, London, UK; Department of Neurology, University of Muenster, Muenster, Germany.
Seizure : the journal of the British Epilepsy Association.Seizure.2012 Jul 10. [Epub ahead of print]
Atonic seizures have traditionally been described in patients with generalized epilepsies; however, ictal atonia is increasingly recognized as a phenomenon of focal seizures. Recognition of atonia as a manifestation of focal seizures is crucial in order to not mislabel these events as non-epileptic.
PMID 22789404

Is the ketogenic diet effective in specific epilepsy syndromes?

Nangia S, Caraballo RH, Kang HC, Nordli DR, Scheffer IE.SourceChildren's Memorial Hospital Epilepsy Center, 2300 Children's Plaza, Box 29, Chicago, IL, 60614-3363, United States.
Epilepsy research.Epilepsy Res.2012 Jul;100(3):252-7. Epub 2012 Mar 15.
Is the ketogenic diet (KD) more effective in certain epilepsy syndromes The KD has been shown to be effective in treating multiple seizure types and epilepsy syndromes. We review the effectiveness of the KD in Dravet syndrome, epilepsy with myoclonic-atonic seizures, mitochondrial disease, tuberous
PMID 22424762

Japanese Journal

脳梁離断術の歴史と手術適応(<特集>てんかん外科)

馬場啓至,小野智憲,戸田啓介,馬場史郎
脳神経外科ジャーナル 16(3), 177-183, 2007-03-20
脳梁離断術は発作の二次性全般化を防止する目的で1940年Van WagenenとHerrenにより報告された.しかしながらその後,全般発作に対する有効性が確認され,過去30年多くの症例に行われた.特に脱力発作,強直発作,全般性強直間代発作に有効で,複雑部分発作についてはその効果が一定していない.手術適応を含め,手術時期,離断範囲など未解決の点も多い.切除外科とは異なり,脳梁離断術はあくまで緩和手術 …
NAID 110006223984

Partial Epilepsy Manifesting Atonic Seizure: Report of Two Cases

SATOW Takeshi,IKEDA Akio,YAMAMOTO Junichi,TAKAYAMA Motohiro,MATSUHASHI Masao,OHARA Shinji,MATSUMOTO Riki,BEGUN Tahamina,FUKUYAMA Hidenao,HASHIMOTO Nobuo,SHIBASAKI Hiroshi
Epilepsia : journal of the International League against Epilepsy 43(11), 1425-1431, 2002-11-01
NAID 10010879895