Developmental and Epileptic Encephalopathy (DEE)

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Download the DEE ToolkitWhat is developmental and epileptic encephalopathy (DEE)?
Developmental and epileptic encephalopathy (DEE) refers to a group of severe epilepsies that are characterized both by seizures, which are often drug-resistant, as well as encephalopathy, which is a term used to describe significant developmental delay or even loss of developmental skills. In the DEEs, there are two factors that contribute to the developmental delay.
- Developmental encephalopathy implies that developmental delays are the direct result of the underlying cause of their epilepsy.
- In addition, some children with DEEs also have an epileptic encephalopathy due to very frequent seizures and markedly abnormal EEGs, which may substantially worsen developmental problems.
Importantly, if seizure control can be improved, the Epileptic Encephalopathy component of the delay should improve, however the Developmental Encephalopathy component will not change.
Most DEEs begin early in life, often starting in infancy. Children often have very frequent and severe seizures which can be of multiple types. Often epileptic spasms, tonic or atonic seizures and myoclonic seizures can be seen. In most cases, seizures are life long, although less commonly can abate with time with certain syndromes or specific causes.
The electroencephalographs (EEGs) in children with DEEs are typically very abnormal, showing diffuse slowing of the background, and frequent seizure discharges. However, in some cases, the EEGs done early on (before or very shortly after the seizure onset) may not show abnormalities.
What causes DEE?
Children who have a developmental and epileptic encephalopathy (DEE) should be promptly referred to a pediatric epilepsy specialist to carefully evaluate for underlying cause, and to choose the best treatment. There are many types of epilepsy that fall into the DEE group:
- Infantile spasms or West syndrome
- Early Myoclonic Encephalopathy
- Ohtahara syndrome
- Epilepsy in Infancy with Migrating Focal Seizures
- Dravet syndrome
- Lennox-Gastaut syndrome
- Myoclonic Atonic Epilepsy (Doose syndrome)
- Landau-Kleffner syndrome
- Epileptic encephalopathy with Continuous Spike and Wave in Sleep
- Febrile infection-related epilepsy syndrome (FIRES)
Some syndromes are highly correlated with specific causes (such as Dravet syndrome with SCN1A gene changes) while other syndromes have multiple, possible causes (such as infantile spasms).
Additionally, many children will have an identified underlying cause for their seizures. Increasingly, genetic causes are recognized in early-life DEEs. Another common cause is structural brain changes, which can be a result of abnormal brain development (such as cortical dysplasia or hypothalamic hamartoma) or a brain injury that occurs early in life.
Less commonly, DEEs can be the result of a metabolic cause, due either to inability of the body to produce a key component to keep cells healthy or to build-up of a product that is toxic to cells.
Treatments are often targeted based on seizure type(s) or epilepsy syndrome. However, treatments may also be targeted to the specific cause. For example, some children with a structural cause can be good candidates for epilepsy surgery, which should be done early to prevent further neurological regression. Some genetic disorders may respond very well to a certain medication, but significantly worsen with another agent. Metabolic disorders may respond well to a specific supplement or diet. Increasingly, there are very focused “precision” treatments that involve enzyme replacement or genetic treatments for some conditions.
What to do when there is no known cause?
Many pediatric epileptologists are comfortable doing genetic testing. If not, you should discuss referral to a geneticist. There is no one test to diagnosis for all genetic epilepsies. Find more information on various tests to identify the specific causes of each child’s epilepsy.
At times, insurance may deny genetic testing. However, epilepsy panels can be done free of charge through Invitae for children under 8 years of age.
The field of genetics is evolving rapidly. With new causes of epilepsy being found and information for variants originally identified as having unknown significance (or VUSs), it is important to have genetic reports reviewed or additional testing done every 2 years. A geneticist is often a key member of your healthcare team, even if you do not see them very often.
What challenges do people with DEE face?
People with developmental and epileptic encephalopathy (DEE) typically have epilepsy that is often challenging to treat. Seizures are often very frequent, and respond poorly to most medications, meaning they are drug-resistant. In many cases, the specific cause or epilepsy syndrome may guide treatment choice.
In some cases, seizures will go away, but people are often left with a serious neurological disability that has a tremendous impact on their quality of life. In addition to seizures, the following problems are common in children with DEE.
- Intellectual disability – people with DEE all have variable degrees of intellectual disability, relating to the underlying cause of their epilepsy as well as the frequency of seizures. In many cases, developmental delays can become more problematic with time, particularly during periods of very frequent seizures.
- Movement disorders – many people with DEE have various movement disorders including spasticity, choreiform movements, dystonia, and myoclonus. It is important to distinguish these movements from seizures, as treatment is different. If your child develops a new movement, you can often help your health care provider make the correct diagnosis by recording the movement with a cellphone or camera. In other cases, a video-EEG study may be required to confirm which events are seizures versus movement disorders.
- Respiratory issues – Respiratory problems such as aspiration (breathing food, saliva, or stomach contents into the lungs) and recurrent pneumonias are common in people with DEEs. These are mostly seen in those with severe delay with abnormal tone (hypotonia or hypertonia) that limits their ability to roll, turn, or raise their heads or cough. However, superimposed frequent seizures may increase the risk of aspiration.
- Gastrointestinal issues – Many people with DEEs have difficulty with coordinating their swallow, or problems with gastroesophageal reflux (food coming from the stomach into the feeding tube or esophagus). This leads to an increased risk of aspiration and pneumonia. In such cases, a person may need placement of a feeding tube, and surgery to decrease the risk of reflux (Nissen fundoplication). Due to limited mobility, constipation is also common.
- Orthopedic concerns – Orthopedic concerns, such as hip dislocation and scoliosis (curvature of the spine) are commonly seen. Additionally, people with DEEs are at increased risk of bone fractures due to limited mobility and chronic use of antiseizure medications. Vitamin D supplementation is important to try to mitigate this risk.
- Sleep – Sleep problems are commonly seen which can include excessive daytime sleepiness, problems with sleep maintenance and sleep apnea.
- Sudden Unexpected Death in Epilepsy (SUDEP) and increased risk of death – Persons with DEEs have a significantly increased risk of death compared to otherwise healthy individuals. Several factors contribute to this increased risk. Most deaths are in fact unrelated to seizures but the result of significant neurological disability- and in many cases, death is due to pneumonia. Occasionally, deaths can be related to seizures, either due to SUDEP, seizure-related injury or status epilepticus.
What evaluation is typically done for DEEs?
The evaluation for people with DEE focuses on the following:
- Identifying the underlying cause,
- Evaluating current seizure frequency and types,
- Identifying other medical and psychosocial issues that need to be addressed
- Determining treatment options
The most important part of the evaluation will be sitting down with your health care provider and having a detailed discussion about developmental, medical, and seizure history. Additional evaluations will be arranged based on that discussion. Depending on the history and circumstances, evaluations may be made in a stepwise or more comprehensive fashion. Stepwise testing allows more selective evaluation, with a few tests being ordered and then additional tests being ordered only if the first tests do not reveal the underlying cause.
Identifying the Cause
As we learn more about more precision epilepsy treatments, identification of the specific cause can be helpful in determining preferred treatments. EEG (electroencephalogram) and brain MRI (magnetic resonance imaging) are performed as common practice. Blood tests for genetic disorders should be strongly considered in most cases, and the person’s genetic tests may be compared to those of his/her parents. Tests looking for possible metabolic or inflammatory disorders may be performed on blood, urine, and/or spinal fluid samples. Finally, if it is felt that seizures are coming from a focal area of the brain, but the MRI does not help in figuring out where seizures are coming from, other imaging tests may be performed, including PET (positron emission tomography) and MEG (magneto-encephalography).
Evaluating Seizure Frequency and Types
During the visit, the doctor will take a careful history of all seizure types, including a description of what the person does, how long they last, how often they occur, what the person is like after the seizure, and seizure triggers. They will also ask about whether, and how often, seizure rescue medications are needed for each seizure type. Sometimes, the history alone is not sufficient. Prolonged EEG may be used to determine how many times per day seizures occur or to better classify what types of seizures the patient is having. Prolonged EEGs with video are most helpful. This is done either in the hospital setting (prolonged video EEG) or at home (prolonged ambulatory EEG). Home videos of the different seizure types are also helpful and may decrease the need for a prolonged EEG.
Identifying Other Medical and Psychosocial Issues
People with epilepsy are at risk for learning, behavioral, and emotional disorders. Those with DEE not only are more likely to have these difficulties, but also likely to have other medical complications. It is important to treat the whole person and address all areas of concern. Comprehensive care with good communication between the different providers is important. Often, a comprehensive or complex care clinic can help families manage all of the different providers involved in the care of their loved one.
Determining Treatment Options
While anti-seizure medications (ASMs) are the mainstay of epilepsy treatment, those with DEEs often have an incomplete response and additional treatment options may be pursued. These options can include trials of other medications, especially if the person has not yet tried medications shown to be more helpful for his/her epilepsy syndrome. It is important to keep a record of all of the different treatments your loved one has previously tried. If the evaluation of current seizure types suggests the majority of seizures are coming from one area of the brain, surgery to remove that area might be possible. If the evaluation suggests an underlying metabolic or inflammatory disorder, this will lead to other treatment options. Finally, the person should also be evaluated to see if he/she is a candidate for ketogenic diet.
Developing Your Healthcare Team
One of the most important lessons families with children with complex seizure disorders learn is taking charge of building a healthcare team for their loved one. Many early signs of emerging developmental and epileptic encephalopathy (DEE) may be hard to detect. However, due to knowing and observing their child closely, families often have sound instincts that “something is really off.”
Families suspecting their child may have a complex seizure disorder with or without developmental delays should consider the following steps in building a tailored healthcare team to assure your child’s early diagnosis and optimal treatment.
Specialists
There is little to lose and a lot to gain by seeking out a doctor with special expertise in early onset childhood epilepsy as early as possible. You may want to seek out a pediatric epileptologist (a neurologist who specializes in treating epilepsy in children) rather than a general child neurologist, who focuses on all disorders of the brain, including epilepsy.
A pediatric epileptologist with this expertise will oftentimes be found at a specialized epilepsy center – either through a Children’s Hospital or other teaching/university affiliated hospital. Epilepsy Centers have various levels of capabilities – try to find a “Level 4” center if possible. Epilepsy Centers are certified by and can be identified through the National Association of Epilepsy Centers.
After receiving a diagnosis, families usually benefit from identifying a team of specialists in your child’s specific disorder (e.g. Dravet Syndrome or CDKL5). This typically involves a pediatric epileptologist, and often other specialists such as geneticists. This is important since each condition is not only rare, but often remarkably diverse – so you will want a specialist who follows the quickly emerging literature to get the best treatment for your child.
Patient organizations are often a good source for information on either dedicated treatment centers or individual clinicians. Visit the Rare Epilepsy Network for a list of patient organizations in over 60+ rare epilepsies.
If specialty centers with disease-specific expertise are challenging to get to, consider using them as consultants who can work in partnership with your local provider, sharing expertise and insights into the condition, complexities, and treatments. Oftentimes centers with specialty expertise will provide a telehealth consultation where they will review your child’s history, along with results of their testing, and provide advice about next steps.
Finding the right team of medical professionals is critical – you need providers that you are confident in, who listen to you, and talk to you in a voice you understand. Ideally, find doctors who takes a holistic view of your child beyond the epilepsy, assuring you get appropriate support for the wide range of other medical issues often referred to as comorbidities. The goal is to find providers who will collaborate with you and other professionals on the team. You want them to be accessible and understand the often-difficult decisions/tradeoffs you will be required to make on your child’s behalf.
A complex care team
Many children’s hospitals have a complex care team, often managed by doctors who help integrate the care for complex cases. A complex care team might assist in integrating treatment by a range of specialists including for example, a neurologist, neurosurgeon, gastroenterologist, pulmonologist, endocrinologist, neuropsychologist, physical medicine specialist, social worker, and other specialists. They are often extremely helpful to families in troubleshooting a wide range of problems and challenges in their children’s care. If such a program is not available, you will want to cultivate the right relationship with either your primary care doctor, neurologist, or epileptologist to be sure you have someone who is focusing on your child as a whole and coordinating care across many specialties.
Pediatric hospice for palliative care
Pediatric hospice or palliative care can be helpful to families with children whose condition is considered life threatening. Death does not need to be imminent for these teams to be involved. It is quite different than adult hospice because it can be provided along with treatments meant to cure. It can begin at any age and at any stage of an illness. Such programs often provide much needed support for families including assistance in coordinating care across many providers and even managing prescriptions and insurance appeals. Palliative care benefits both the child and the family by focusing on efforts to relieve the symptoms, pain and emotional wear-and-tear that makes managing a complex medical condition so difficult for the child and the family. For a guide to pediatric hospice care provided by the American Academy of Pediatrics, visit the Healthy Children’s website.
Resources for DEEs
As you begin your journey in finding supports for you and your family, know you are not alone. Seeking ways to support your child and family can be both empowering and yet challenging. Here are a few starting points to give you guidance. This list is not exclusive, rather ways to begin.
Enroll In Your Local Early Intervention Program
Seek out assistance from your local early intervention program, provided by law in every state, which provides services for babies and young children with developmental delays and/or disabilities and support for their families. Services may include speech therapy, physical therapy, and other types of services based on the needs of the individual child and family.
Medical specialists in physical medicine and related therapies will be available through the Physical Medicine and Rehabilitation unit in your hospital. They are often critical for getting referrals for equipment support needs (such as orthotics, a wheelchair, walker aid, specialized bathing equipment etc.)
Calling your local school district office would be a good place to start asking how to have your child assessed for early intervention services.
Identify Your Support Network
Parents of children with complex medical conditions are so laser focused on getting help for their children that they often neglect support for themselves and their family. Support services should be available through your hospital, other public (e.g. country, state and county programs) or private support service programs, or possible peer-support programs through your rare disease community. Families should prioritize getting some respite care for the “marathon” of caring for your child.
Support services may also be helpful in determining whether your child may be eligible for a Medicaid waiver program in your state, which often provides substantial support for the care of medically complex children. Some states have a long wait list for waivers, so as soon as you see the potential need for services like skilled nursing or respite care, sign up. There are also ways to expedite this process if your child meets certain care criteria. These systems can be difficult to maneuver, but most states have advocates ready to help you.
Advocacy Groups
The Arc is an advocacy group throughout the U.S. that supports people with developmental disabilities and their caregivers. They have expertise in advocacy, parent to parent supports, and the like. This group started many years ago by parents who advocated for children and adults to live in the community as independently as possible.
National Programs
National Organization for Rare Diseases (NORD) is a national program providing education regarding a child’s rare disease diagnosis and support. They also provide links on their website to patient assistance programs for various rare diseases as well as additional financial assistance resources.
The Sibling Support Project is a national program dedicated to the siblings of people with special developmental, health, and mental health needs.
State Programs
Each state has at least one parent training and information center that specializes in navigating specific support programs for you and your child, such as parent to parent, financial programs for your state and local area.
Services for Children and Youth with Special Health Needs is a Title V program that have very helpful staff who are experts in your state’s programs. You can find your area’s contact by searching the internet with the name of your state and “services for children and youth with special health needs.”
Additional Programs
- TEFRA/Katie Beckett Programs- open a pathway for your child to have Medicaid eligibility, without parent income considered for eligibility. Some states look at a parent fee if you choose to participate in this program.
- Pacer Center- You may have insurance from your workplace and still have Medicaid for your child as a safety net. Take a look at Pacer Center's website for detailed information, including videos and translated material to learn more.
- County case managers/resource coordinators- can assist with local resource navigation and supports such as respite care, family support grant, waiver services, respite care. Contact your local county and request an intake worker to help learn more of your county’s first step in getting connected.
- Waiver Services- A child will typically need to be on Medicaid through TEFRA to be assessed for waiver programs in your state. The waiver service program is like Medicaid with added coverage for things such as home modifications, in home care, and the like. In some limited states, paid parent program is one wavier service offered. Your county case manager/resource coordinator is your contact.
- SSI for children- a federal financial program for a child who has significant health needs AND assessed your family income and assets to see if you meet the financial guidelines. It is a complex application process, so seek a local advocate/county case manager/ARC representative to assist.
- DEE-P Connections- an organization providing resources and leveraging knowledge to improve DEE outcomes.
Resources
Epilepsy Centers
Epilepsy centers provide you with a team of specialists to help you diagnose your epilepsy and explore treatment options.
Epilepsy Medication
Find in-depth information on anti-seizure medications so you know what to ask your doctor.
Epilepsy and Seizures Helpline
Call our Epilepsy and Seizures Helpline and talk with an epilepsy information specialist or submit a question online.
Tools & Resources
Get information, tips, and more to help you manage your epilepsy.