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What types of seizures are linked to Dravet syndrome?
Dravet syndrome is a rare, severe form of epilepsy that usually begins in infancy. The seizures are often frequent, prolonged, and difficult to control with standard treatment. They can change over time, with different seizure types appearing as a child gets older.
The most common first seizure is a prolonged fever-related seizure, often called a febrile seizure. This may look similar to a typical childhood seizure at first, but in Dravet syndrome it is often longer and more severe. Over time, other seizure types usually develop.
Common seizure types
Children with Dravet syndrome may have tonic-clonic seizures, where the body stiffens and then jerks rhythmically. These seizures can affect the whole body and may last several minutes or longer. They are often very obvious to parents and carers.
Focal seizures are also common. These start in one part of the brain and may cause twitching, staring, unusual movements, or changes in awareness. Sometimes they spread and become a generalised seizure.
Myoclonic seizures can occur too. These involve sudden brief jerks of the arms, legs, or whole body. They may happen in clusters and can be mistaken for normal startles in younger children.
Seizures often triggered by fever or heat
Seizures in Dravet syndrome are frequently triggered by fever, illness, or even a rise in body temperature. A hot bath, warm weather, or physical exertion can sometimes bring one on. This makes seizure management more challenging for families.
In some children, flashing lights or strong visual patterns may also trigger seizures. However, temperature-related triggers are among the most common. Because of this, parents are often advised to monitor fevers closely and seek medical advice early.
Why seizure recognition matters
Seizures in Dravet syndrome can be prolonged and may lead to status epilepticus, which is a medical emergency. They can also happen in clusters, meaning several seizures occur close together. This can be frightening and exhausting for the child and family.
Recognising the type of seizure is important because treatment plans often need to be tailored carefully. Some anti-seizure medicines may help, while others can make seizures worse in Dravet syndrome. A specialist epilepsy team can advise on the safest options.
When to seek help
If a child has a seizure that lasts longer than five minutes, emergency help should be sought straight away. The same applies if seizures happen back to back, breathing is affected, or the child does not recover as expected. Parents and carers are often given a rescue medicine plan for this reason.
In the UK, children with suspected Dravet syndrome should be assessed by a paediatric neurologist or epilepsy specialist. Early diagnosis can help families better understand the seizure pattern and plan appropriate care. Support is also available through specialist epilepsy services and charities.
Frequently Asked Questions
The main Dravet Syndrome seizure types include prolonged febrile seizures, generalized tonic-clonic seizures, myoclonic seizures, focal seizures, hemiclonic seizures, absence-like seizures, and other mixed seizure patterns that can change over time.
Dravet Syndrome seizure types often begin in infancy, commonly with prolonged seizures triggered by fever, illness, overheating, or sometimes vaccination. Early seizures may look like generalized or hemiclonic convulsions.
A febrile seizure in Dravet Syndrome seizure types is a seizure associated with fever. In Dravet Syndrome, these seizures are often unusually long, frequent, or severe compared with typical childhood febrile seizures.
A hemiclonic seizure in Dravet Syndrome seizure types affects one side of the body, causing rhythmic jerking or stiffening on the left or right side. These seizures are common early in the condition.
A generalized tonic-clonic seizure in Dravet Syndrome seizure types involves stiffening of the body followed by rhythmic jerking of the arms and legs, often with loss of awareness. These seizures can be prolonged and may require emergency care.
Myoclonic seizures in Dravet Syndrome seizure types are brief, sudden muscle jerks that may affect one part of the body or the whole body. They can happen many times a day and may be mistaken for startles.
Focal seizures in Dravet Syndrome seizure types start in one area of the brain and may cause movements, sensations, or behaviors affecting one side of the body or causing altered awareness. They can sometimes spread and become generalized.
Absence-like seizures in Dravet Syndrome seizure types involve brief episodes of staring or reduced responsiveness. They may resemble typical absence seizures, but in Dravet Syndrome they can be part of a broader and more complex seizure pattern.
Yes, Dravet Syndrome seizure types often change over time. A child may start with prolonged fever-related seizures and later develop myoclonic, focal, generalized tonic-clonic, or mixed seizure types.
Common triggers for Dravet Syndrome seizure types include fever, infection, overheating, sudden temperature changes, sleep deprivation, excitement, and sometimes flashing lights or other sensory stimuli.
Some Dravet Syndrome seizure types, especially febrile or generalized tonic-clonic seizures, can last several minutes or longer. Prolonged seizures are a serious concern and may become status epilepticus.
Status epilepticus in Dravet Syndrome seizure types is a prolonged seizure or a series of seizures without full recovery between them. It is a medical emergency and needs urgent treatment.
Dravet Syndrome seizure types are often more frequent, prolonged, and varied than typical childhood seizures. They may be resistant to standard treatments and are often triggered by fever or temperature changes.
No, Dravet Syndrome seizure types do not always involve fever. While fever-triggered seizures are common early on, many people later have afebrile seizures that occur without any obvious trigger.
Yes, Dravet Syndrome seizure types can occur during sleep as well as when awake. Some seizures may be noticed by caregivers because of movements, sounds, or changes in breathing.
Yes, some Dravet Syndrome seizure types can affect breathing, especially prolonged generalized tonic-clonic seizures or severe convulsive seizures. Breathing changes during a seizure are a reason to seek urgent medical help.
Dravet Syndrome seizure types are diagnosed through medical history, seizure description, neurological evaluation, EEG testing, and often genetic testing, especially when an SCN1A variant is suspected.
A seizure diary for Dravet Syndrome seizure types can record the date, time, duration, seizure type, possible trigger, fever, rescue medication use, and recovery time. This helps clinicians adjust treatment.
The most urgent Dravet Syndrome seizure types are prolonged convulsive seizures, repeated seizures without recovery, seizures with breathing problems, and any seizure lasting longer than the person's emergency plan allows.
Accurately identifying Dravet Syndrome seizure types helps guide treatment, rescue medication use, emergency planning, and long-term care. It also helps distinguish seizure patterns and monitor changes over time.
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