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A seizure is a sudden change in behavior, movement or consciousness due to abnormal electrical activity in the brain. [3] [6] Seizures can look different in different people.. It can be uncontrolled shaking of the whole body (tonic-clonic seizures) or a person spacing out for a few seconds (absence seizure
A generalized tonic-clonic seizure (GTCS), also known as a grand mal seizure, is a whole-body seizure that has a tonic phase followed by clonic muscle retrenchments. [14] [15] GTCSs can happen in people of all ages. [15] GTCSs are very hazardous, and they increase the risk of injuries and sudden unexpected death in epilepsy (SUDEP). [16]
Seizures may also occur as a consequence of other health problems; [30] if they occur right around a specific cause, such as a stroke, head injury, toxic ingestion, or metabolic problem, they are known as acute symptomatic seizures and are in the broader classification of seizure-related disorders rather than epilepsy itself.
Post-traumatic seizures (PTS) are seizures that result from traumatic brain injury (TBI), brain damage caused by physical trauma.PTS may be a risk factor for post-traumatic epilepsy (PTE), but a person having a seizure or seizures due to traumatic brain injury does not necessarily have PTE, which is a form of epilepsy, a chronic condition in which seizures occur repeatedly.
Seizures that occur after head injury are not necessarily due to epilepsy or even to the head trauma. [11] Like anyone else, TBI survivors may have seizures due to factors including imbalances of fluid or electrolytes , epilepsy from other causes, hypoxia (insufficient oxygen), and ischemia (insufficient blood flow to the brain). [ 11 ]
About 2-5% of all children will experience such a seizure during their childhood. [26] In most cases, a febrile seizure will not indicate epilepsy. [26] Approximately 40% of children who experience a febrile seizure will have another one. [26] In those with epilepsy, fever can trigger a seizure.
A seizure is a paroxysmal episode of symptoms or altered behavior arising from abnormal excessive or synchronous brain neuronal activity. [5] A focal onset seizure arises from a biological neural network within one cerebral hemisphere, while a generalized onset seizure arises from within the cerebral hemispheres rapidly involving both hemispheres.
[8] [9] Resective surgery involves cutting away or disconnecting areas of the brain that are generating or propagating seizures. [8] Epileptologists, neurologists with special training in epilepsy, will also confirm the diagnosis of epilepsy to make sure that seizure-like activity is truly due to epilepsy as opposed to non-epileptic seizures. [10]
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