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Generalized seizures affect both sides of the brain and typically involve both sides of the body. [3] They all involve a loss of consciousness and usually happen without warning. [3] [13] There are six main types of generalized seizures: tonic-clonic, tonic, clonic, myoclonic, absence, and atonic seizures. [3]
Because epileptic seizures typically include convulsions, the term convulsion is often used as a synonym for seizure. [1] However, not all epileptic seizures result in convulsions, and not all convulsions are caused by epileptic seizures. [1] [2] Non-epileptic convulsions have no relation with epilepsy, and are caused by non-epileptic seizures. [1]
In those whose seizures do not respond to medication; surgery, neurostimulation or dietary changes may be considered. [5] [6] Not all cases of epilepsy are lifelong, and many people improve to the point that treatment is no longer needed. [1] As of 2021, about 51 million people have epilepsy. Nearly 80% of cases occur in the developing world.
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.
A generalized tonic–clonic seizure, commonly known as a grand mal seizure or GTCS, [1] is a type of generalized seizure that produces bilateral, convulsive tonic and clonic muscle contractions. Tonic–clonic seizures are the seizure type most commonly associated with epilepsy and seizures in general and the most common seizure associated ...
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]
In children between the ages of 6 months and 5 years, a fever of 38 °C (100.4 °F) or higher may lead to a febrile seizure. [25] 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]
Thereafter, the seizure may or may not evolve into loss of consciousness and a generalized tonic–clonic seizure. [2] [1] In contrast to the auras in ecstatic seizures, most auras of seizures generally are unpleasant, including feelings of anxiety and fear (60%) as well as depression, while positive feelings are only rarely reported. [1]
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