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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 ...
Epilepsy and driving is a personal and public safety issue. A person with a seizure disorder that causes lapses in consciousness may put themselves and the public at risk if a seizure occurs while they are operating a motor vehicle.
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 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 seizures).
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.
Juvenile Myoclonic Epilepsy (JME), also referred to as Janz Syndrome and Impulsive Petit Mal, is a form of epilepsy that is characterized by absence, Myoclonic, and Generalized Tonic-Clonic Seizures. This epilepsy variant is marked by its idiopathic and hereditary characteristics, as well as its generalization across seizures.
JME first presents between the ages of 12 and 18 with prominent myoclonic seizures. These seizures tend to occur early in the morning. Patients with JME may also have generalized tonic-clonic seizures and absence seizures. Linkage of this disorder has been shown to mutations in the genes GABRA1, CACNB4, CLCN2, GABRD2, EFHC1, and EFHC2.
A focal impaired awareness seizure affects a larger part of the hemisphere and the person may lose consciousness. If a focal seizure spreads from one hemisphere to the other side of the brain, this will give rise to a focal to bilateral seizure. [5] [6] The person will become unconscious and may experience a tonic–clonic seizure.