- Douglas R. Nordli Jr.
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Atonic seizure is one of a variety of seizure types including myoclonic, myoclonic–atonic, and tonic that can cause sudden falls. The exact delineation of the seizure type in the patient with drop seizures will often require polygraphic recordings. In the past, they have gone by a variety of different names including static, akinetic, and astatic. Atonia is meant to designate a pure loss of tone.
The ILAE glossary defines atonic seizures as a “sudden loss or diminution of muscle tone without apparent preceding myoclonic or tonic event lasing ≥1–2 seconds, involving head, runk, jaw, or limb musculature.” Astatic seizures are a “loss of erect posture that results from atonic, myoclonic or tonic mechanism.” Drop attacks are synonymous (Blume et al. 2001).
Atonic seizures are classified among the generalized seizures even though there is a clear clinical evidence of focal contributions (Engel 2001).
- Blume WT, Luders HO et al. (2001) Glossary of descriptive terminology for ictal semiology: report of the ILAE task force on classification and terminology. Epilepsia 42(9):1212–1218 CrossRef
- Engel J Jr (2001) A proposed diagnostic scheme for people with epileptic seizures and with epilepsy: report of the ILAE task force on classification and terminology. Epilepsia 42(6):796–803 CrossRef
- Tassinari CA, Michelucci R et al. (2008) Atonic and myoclonic-atonic seizures. In: Engel J Jr, Pedley TA (eds) Epilepsy: a comprehensive textbook, vol 1. Lippincott Williams & Wilkins, Philadelphia, pp 601–609
- Wheless JW, Clarke DF et al. (2005) Treatment of pediatric epilepsy: expert opinion, 2005. J Child Neurol 20(1):S1–S56; quiz S59–S60 CrossRef
- Atonic Seizures
- Reference Work Title
- Atlas of Epilepsies
- pp 395-398
- Print ISBN
- Online ISBN
- Springer London
- Copyright Holder
- Springer-Verlag London Limited
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- C. P. Panayiotopoulos PhD, FRCP (1) (2)
- Editor Affiliations
- 1. Department of Clinical Neurophysiology and Epilepsies, St. Thomas' Hospital
- 2. Department of Neurosciences, John Radcliffe Hospital
- Author Affiliations
- 1. Children’s Memorial Hospital, Feinberg School of Medicine, Northwestern University,, Chicago, IL, USA
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