Dravet syndrome, previously called severe myoclonic epilepsy of infancy (SMEI), is an epilepsy syndrome that begins in infancy or early childhood and can include a spectrum of symptoms ranging from mild to severe
Dravet syndrome is the most severe of a group of conditions known as SCN1A-related seizure disorders. Symptoms include seizures which first occur in infancy that are often triggered by high temperatures. In childhood, many types of seizures may occur and they may increase in frequency. Seizures may be difficult to treat. Other symptoms include loss of motor skills, intellectual disability, speech impairment, and difficulty with movement.
Dravet syndrome is caused by mutations in SCN1A gene.