![]() Seizures generally start within the first year of life. Not all SCN1A mutations are associated with Dravet syndrome. It is considered a de novo or "new" mutation in the child. This mutation is most often not inherited from the parents. ![]() About 8 out of 10 people with this syndrome have a gene mutation in SCN1A that causes problems in the way ion channels in the brain work.MRI (magnetic resonance imaging) and EEG (electroencephalogram) tests are usually normal in infants at first. ![]() By later childhood, most children also develop a crouched walk. Yet as seizures continue, most children develop some level of developmental disability.
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