Glossary

Getting a specific diagnosis

By confirming a diagnosis early on, your doctors can work with you to develop the right treatment plan. Unrecognized and/or uncontrolled seizures are linked to developmental delays, learning and behavioral disorders, and other negative long-term outcomes. Check out our seizure library for help with recognizing different types of seizures.

Seizure library

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“It was his adult neurologist who finally made the diagnosis of LGS. With a proper diagnosis, he was able to get on medications that worked better for him.

— Annette, parent of a loved one living with LGS

Diagnosis can be challenging

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Evolving symptoms

Even if symptoms shift or appear slowly, each sign brings you one step closer to the answers and support your loved one deserves.

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Symptoms may match more than one condition

LGS can look similar to other conditions at first, but with careful testing and evaluation, your doctor can better pinpoint the right path forward.

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Multiple causes

There are several factors that may cause a person to develop LGS, such as a brain injury early in life, abnormal brain function in the womb, certain genetic mutations, brain infections, metabolic disorders, or immune disorders. In some cases, the cause may even be unknown.

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Confirming diagnosis

LGS itself is not genetic, but it can appear alongside genetic conditions. In some cases, a genetic mutation may be the underlying cause of seizures that later develop into LGS. While LGS isn’t inherited, genetic testing may help your doctor better understand what’s driving the seizures and guide the path to diagnosis.

What kind of testing is available for LGS?

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REST-LGS tool

Your doctor may use an expert-approved tool like the Refractory Epilepsy Screening Tool for LGS (REST-LGS) to help assess the likelihood of an LGS diagnosis.

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Genetic testing

There are many different genes that can be associated with LGS. Genetic testing may help identify if your loved has one of these genes to support a diagnosis of LGS, or may help identify other underlying conditions that could be contributing to seizures.

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Electroencephalograms (EEGs)

Some EEG results like a slow spike-wave pattern (SSW) are a strong indicator of LGS.

Ready to talk to your doctor about LGS? First, answer a few questions. Your responses will help create a personalized discussion guide you can use to get the conversation started.

Begin questionnaire

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“There was a sense of relief after getting a diagnosis and finally having some understanding of what this is and what options might look like for treatment.

— Jon, parent of a loved one living with LGS

What's next after diagnosis?

There are still potential treatment options out there for uncontrolled seizures that might work for your loved one.

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Medications

Medications, including antiseizure medications (ASMs)*, are used to treat seizures. Certain rescue medications may be used for seizures that last longer than 5 minutes or occur very close together without breaks.

Learn about a specific medication for LGS

*It may be necessary to try more than one ASM at a time to effectively reduce the number of seizures because these drugs may work through different targets in the brain. These therapies may take a while to start working, and it is not uncommon for people to be on multiple therapies at a time.

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Dietary therapies

Some people try dietary approaches, such as the high-fat, low-carb, medical ketogenic diet, which is carefully monitored by a dietitian.

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Devices and surgery

For some people, the use of implanted devices or surgical methods may be recommended.

More to explore:

Learn more about the different types of seizures

Seizure library

Talk to your doctor about LGS 

Meeting with your doctor

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Autism
  • A neurodevelopmental disorder that can exhibit characteristics such as deficits in social communication, repetitive behaviors, and restricted interests 
  • Autism is more common in males than females, with an estimated ratio of around 3:1 
Cerebral palsy
  • A neuromotor disorder caused by an injury to the developing brain before or shortly following birth 
  • Development of movement, muscle tone, and posture can be affected 
Developmental delays
  • Refers to when a child does not achieve developmental milestones in comparison to peers of the same age range 
  • Examples include lack of engagement with age-appropriate toys, speech delays, or other delays identified by a doctor 
Electroencephalogram (EEG)
  • A diagnostic test that measures electrical activity in the brain using small electrodes attached to the scalp 
  • It is commonly used to detect abnormalities related to epilepsy and other neurological disorders 
Epileptologist
  • A neurologist who has undergone specific training in the diagnosis and management of epilepsy 
  • Epileptologists focus on the management of patients with epilepsy 
Genetic mutation
  • A permanent alteration in the DNA sequence that makes up a gene 
  • Some genetic mutations are hereditary, while others occur spontaneously 
  • Certain mutations are linked to specific medical conditions, including some forms of epilepsy 
Immune disorders
  • Disorders that result from a dysfunction in the immune system, which may be overactive or underactive 
  • Some immune disorders are thought to contribute to the development of epilepsy and other neurological conditions 
Lennox-Gastaut syndrome (LGS)
  • Lennox-Gastaut syndrome (LGS) is a rare form of epilepsy that usually begins in childhood and is associated with multiple kinds of seizures
Metabolic disorders
  • A group of disorders that affect the body's ability to convert food into energy 
  • These disorders can be genetic and may lead to a variety of health issues, including developmental delays and neurological symptoms 
Neurologist
  • A medical specialist who diagnoses, manages, and treats disorders of the nervous system, including the brain, spinal cord, nerves, neuromuscular junction, and muscles 
  • Neurologists often serve as the first point of contact for patients with neurological symptoms 
Paroxysmal fast rhythms
  • Paroxysmal fast rhythms, also known as generalized paroxysmal fast activity (GPFA), are patterns of neural activity consisting of 8–26 Hz bursts of generalized rhythmic discharges 
  • Paroxysmal fast rhythms have traditionally been associated with Lennox-Gastaut syndrome 
Refractory epilepsy
  • May also be referred to as “uncontrolled,” “intractable,” or “drug-resistant” epilepsy 
  • Occurs when a person has failed to become (and stay) seizure free with adequate trials of 2 appropriately selected antiseizure medications 
Refractory Epilepsy Screening Tool for LGS (REST-LGS)
  • A questionnaire-based tool developed by experts to improve both the identification and treatment of patients with Lennox-Gastaut syndrome (LGS)
  • Helps providers to assess the likelihood that a patient has LGS based on four major symptoms and four minor features commonly associated with LGS 
Slow spike-wave pattern (SSW)
  • Refers to a pattern seen on an electroencephalogram (EEG) characterized by slow, high-amplitude spike-and-wave discharges 
  • This pattern is often associated with specific types of epilepsy, including Lennox-Gastaut syndrome (LGS)
Tuberous sclerosis complex (TSC)
  • Tuberous sclerosis complex (TSC) is a genetic condition characterized by the development of noncancerous tumors that may cause a range of symptoms, including seizures