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Understanding West Syndrome: Symptoms, Causes, Diagnosis, and Treatment Options

Alan Lucks | MD

Medically reviewed by Alan Lucks | MD, Alan Lucks MDPC Private Practice - New York on November 10th, 2023.

Key Takeaways

  • This rare epilepsy syndrome strikes infants between 4-8 months old with characteristic "jackknife" spasms—sudden flexing of arms, legs, and neck lasting 1-2 seconds in clusters of 5-150 seizures.

  • Up to 90% of affected children experience developmental regression, losing previously acquired skills like sitting, babbling, or social responsiveness within weeks of seizure onset.

  • Brain malformations, tuberous sclerosis, and perinatal injuries cause about 80% of cases, while the remaining 20% have no identifiable underlying condition (cryptogenic).

  • EEG testing reveals the hallmark "hypsarrhythmia" pattern—chaotic, high-voltage brain waves that help distinguish this syndrome from other infant seizure disorders.

  • First-line treatments include ACTH hormone injections (response rate 70-80%) or vigabatrin 50-150mg/kg daily, with treatment most effective when started within 4 weeks of seizure onset.

West syndrome is a rare type of epilepsy that affects babies, usually between 4 and 8 months of age. It is named after the doctor who first discovered it and is also known by various other names, such as infantile spasms (IS) and epileptic spasms.

Symptoms of West Syndrome

The primary symptom of West syndrome is seizures that occur in clusters. These seizures are brief, lasting only a few seconds, but can happen up to 150 times in a single cluster. The typical seizure is characterized by a brief, sudden, symmetrical muscle contraction of the arms and legs, often occurring in clusters. But other seizure types can also occur. Some babies may experience as many as 60 clusters a day. Other symptoms may include:

  • Crankiness

  • Loss of appetite

  • Changes in sleep patterns

  • Acting as if they cannot see

  • Slowed development or regression

Causes and Risk Factors

West syndrome is a rare condition, affecting fewer than 6 out of every 10,000 babies. Slightly more than half of the affected infants are boys. Possible causes and risk factors include:

  • Genetic changes

  • Metabolic disorders

  • Unusual brain development or formation

  • Brain injury due to lack of oxygen or other causes

  • Brain infections

Understanding West Syndrome: Symptoms, Causes, Diagnosis, and Treatment Options

Diagnosing West Syndrome

If your child's doctor suspects West syndrome, they will ask for detailed information about your baby's seizures. Recording a video of the seizures can help the doctor differentiate between West syndrome and other conditions, such as colic. An electroencephalogram (EEG) is essential for diagnosing West syndrome, as it records the patterns of electrical activity in the brain. Other tests may include MRI or CT scans, as well as urine, blood, or cerebrospinal fluid (CSF) tests to help determine the underlying cause.

Treatment Options for West Syndrome

Treatment for West syndrome aims to control seizures and may include:

Medication

The most common medications used to treat West syndrome are ACTH (a hormone), vigabatrin (Sabril), steroids like prednisone, and vitamin B6 (if a deficiency is the cause). These medications can have side effects, so it is important to work closely with your child's doctor to balance the benefits and risks.

Ketogenic Diet

A ketogenic diet, which is high in fats and low in carbohydrates, may be recommended by your baby's doctor. This diet should only be implemented under the guidance of a nutrition specialist and may require hospitalization to initiate the process.

Surgery

In some cases, surgery may be necessary if brain scans show lesions or if the cause of West syndrome is a condition like tuberous sclerosis complex. Surgical options include corpus callosotomy (split-brain surgery) and resection of the affected brain areas.

Outlook and Support for West Syndrome

The long-term outlook for children with West syndrome depends on the underlying cause and their development before the onset of the condition. While some children may have normal mental abilities or only mild disabilities, others may experience severe mental disabilities, autism, or hyperactivity. Seeking prompt treatment and achieving quick seizure control can improve the chances of a more favorable outcome.

Parents of children with West syndrome can find support and information through online forums like the Infantile Spasms Project, run by the David Geffen School of Medicine at the University of California, Los Angeles.

The Bottom Line

Early recognition and treatment within the first month of symptoms is critical for preventing permanent developmental disability in affected infants. The distinctive spasm pattern and developmental regression require immediate neurological evaluation and EEG confirmation. If you notice these concerning symptoms in your infant, Doctronic can help connect you with pediatric specialists quickly.

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