An atonic seizure (also called drop seizure, akinetic seizure, astatic seizure, or

drop attack A drop attack is a sudden fall without loss of consciousness. Drop attacks stem from diverse mechanisms, including orthopedic causes (for example, leg weakness and knee instability), hemodynamic causes (for example, transient vertebrobasilar insuf ...

) is a type of

seizure An epileptic seizure, informally known as a seizure, is a period of symptoms due to abnormally excessive or synchronous neuronal activity in the brain. Outward effects vary from uncontrolled shaking movements involving much of the body with los ...

that consists of partial or complete loss of

muscle tone In physiology, medicine, and anatomy, muscle tone (residual muscle tension or tonus) is the continuous and passive partial muscle contraction, contraction of the muscles, or the muscle's resistance to passive stretch during resting state.O’Sull ...

that is caused by temporary alterations in

brain A brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. It is located in the head, usually close to the sensory organs for senses such as vision. It is the most complex organ in a v ...

function. These seizures are brief – usually less than fifteen seconds. They usually begin in

child A child ( : children) is a human being between the stages of birth and puberty, or between the developmental period of infancy and puberty. The legal definition of ''child'' generally refers to a minor, otherwise known as a person younger ...

hood and may persist into

adult An adult is a human or other animal that has reached full growth. In human context, the term ''adult'' has meanings associated with social and legal concepts. In contrast to a " minor", a legal adult is a person who has attained the age of major ...

hood. The seizure itself causes no physical

injury An injury is any physiological damage to living tissue caused by immediate physical stress. An injury can occur intentionally or unintentionally and may be caused by blunt trauma, penetrating trauma, burning, toxic exposure, asphyxiation, o ...

, but the loss of control, predominantly in trunk muscles, can result in direct

from

falling Falling or fallin' may refer to: *Falling (physics), movement due to gravity *Falling (accident) *Falling (execution) *Falling (sensation) People * Christine Falling (born 1963), American serial killer who murdered six children Books * ''Fall ...

Electroencephalography Electroencephalography (EEG) is a method to record an electrogram of the spontaneous electrical activity of the brain. The biosignals detected by EEG have been shown to represent the postsynaptic potentials of pyramidal neurons in the neocortex ...

can be used to confirm diagnosis. It is rare and can be indicative of Lennox–Gastaut syndrome (''see''

Henri Gastaut Henri Jean Pascal Gastaut (April 15, 1915, Monaco – July 14, 1995 Marseille) was a French neurologist and epileptologist. Biography Gastaut was educated in medicine at the University of Marseille, obtaining his medical doctorate in 1945. ...

). 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.

Treatment

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. One surgical approach, selective posterior callostomy, can greatly decrease instances of drop attacks and improve function and behavior in patients with intellectual disability.

References

External links

{{Seizures and epilepsy Pediatrics Seizure types