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In some cases, attacks are aborted when the patient is called. The attack lasts from a few seconds to half a minute and evaporates as rapidly as it commenced. Absence seizures generally are not followed by a period of disorientation or lethargy (postictal state), in contrast to the majority of seizure disorders. [1]
A provoked (or an un-provoked, or an idiopathic) seizure must generally occur twice before a person is diagnosed with epilepsy. When used on its own, the term seizure usually refers to an epileptic seizure. The lay use of this word can also include sudden attacks of illness, loss of control, spasm or stroke. [4]
After a brain injury occurs, there is frequently a "silent" or "latent period" lasting months or years in which seizures do not occur; [6] Canadian neurosurgeon Wilder Penfield called this time between injury and seizure "a silent period of strange ripening". [7]
[3] [8] If a seizure lasts longer than 5 minutes, it is a medical emergency (status epilepticus) and needs immediate treatment. [3] [5] [9] Seizures can be classified as provoked or unprovoked. [3] [6] Provoked seizures have a cause that can be fixed, such as low blood sugar, alcohol withdrawal, high fever, recent stroke, and recent head trauma.
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.
PNES episodes can be difficult to distinguish from epileptic seizures without the use of long-term video EEG monitoring.Some characteristics which may distinguish PNES from epileptic seizures include gradual onset, out-of-phase limb movement (in which left and right extremities jerk asynchronously or in opposite directions, as opposed to rhythmically and simultaneously as in epileptic seizures ...
A soticlestat and antiseizure therapy combination also failed to reduce a severe type of seizure called the drop attack in patients with Lennox-Gastaut syndrome. This study enrolled 270 patients ...
A typical absences seizure usually last between 10 and 30 seconds. [3] Mild automatisms could be seen during the course of the absence and stop with the end of the absence seizure. When an EEG is recorded during the typical absence seizure, a 3 Hz spike-and-wave discharges is recorded starting with the start of the arrest of the activity. At ...
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