Lennox-Gastaut Syndrome occurs in childhood and involves multiple seizure types that are usually difficult to control as well as cognitive impairment.Myoclonic-astatic epilepsy has generalized myoclonic jerks or seizures followed by a loss of muscle tone.Juvenile myoclonic epilepsy (JME) starts around puberty and involves myoclonic seizures usually of the neck, shoulders, or upper arms, as well as generalized tonic-clonic seizures (affecting the whole body).Some examples of syndromes with myoclonic seizures include: Myoclonus can occur as the only seizure manifestation, as one component of a seizure, or one of multiple types of seizures within an epilepsy syndrome. Epileptic myoclonus is the presence of myoclonus in people living with epilepsy.It becomes more intense when a person attempts to move in a certain way (action myoclonus) or perceives a particular sensation. Myoclonic jerks usually involve only a few muscles in one part of the body, but jerks involving many muscles also may occur. Cortical reflex myoclonus originates in the cerebral cortex (the outer layer of the brain that is largely responsible for information processing). One of the causes may be brain damage that results from a lack of oxygen and blood flow to the brain, or it can be secondary to other medical or neurological conditions. It can be the most disabling form of myoclonus affecting the arms, legs, and face. It may become worse during attempts at precise, coordinated movements.
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