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The tonic phase is usually the first phase and consciousness will quickly be lost (though not all generalized tonic–clonic seizures involve a full loss of consciousness), and the skeletal muscles will suddenly tense, often causing the extremities to be pulled towards the body or rigidly pushed away from it, which will cause the patient to ...
Flashing light, such as that from a disco ball, can cause seizures in some people. In some epileptics, flickering or flashing lights, such as strobe lights, can be responsible for the onset of a tonic clonic, absence, or myoclonic seizure. [28]
Tonic-clonic seizures occur with a contraction of the limbs followed by their extension and arching of the back which lasts 10–30 seconds (the tonic phase). A cry may be heard due to contraction of the chest muscles, followed by a shaking of the limbs in unison (clonic phase). Tonic seizures produce constant contractions of the muscles.
Systemic infection with high fever is a common cause of seizures, especially in children. [3] [25] These are called febrile seizures and occur in 2–5% of children between the ages of six months and five years. [26] [25] Acute infection of the brain, such as encephalitis or meningitis are also causes of seizures. [3]
A familial history of seizures puts a person at a greater risk of developing them. [12] [13] Generalized seizures have been broadly classified into two categories: motor and non-motor. [8] 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 ...
People with PSE experience epileptiform seizures upon exposure to certain visual stimuli. The exact nature of the stimulus or stimuli that triggers the seizures varies from one patient to another, as does the nature and severity of the resulting seizures (ranging from brief absence seizures to full tonic–clonic seizures).
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.
The seizures can be of the tonic–clonic type, with a regular pattern of contraction and extension of the arms and legs, or of types that do not involve contractions, such as absence seizures or complex partial seizures. [1] Status epilepticus is a life-threatening medical emergency, particularly if treatment is delayed. [1]
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