Understanding EMAtS (Doose Syndrome)

If your child was healthy and meeting every milestone until suddenly being overwhelmed by seizures, the world can feel like it has shifted under your feet. This experience—of a previously healthy child suddenly developing frequent, unpredictable seizures—is a common presentation of Epilepsy with Myoclonic-Atonic Seizures (EMAtS), formerly and still commonly known as Doose Syndrome.

EMAtS is a rare condition, accounting for approximately 1% to 2% of all childhood epilepsies ^[1][2]. It typically begins between the ages of 2 and 4, though onset can range from 6 months to 6 years ^[3][4]. For many parents, the diagnosis marks the beginning of a period characterized by intense medical appointments, new terminology, and a deep sense of uncertainty.

Defining EMAtS

The name of this syndrome describes its core feature: myoclonic-atonic seizures.

• Myoclonic: A sudden, brief muscle jerk.
• Atonic: A sudden loss of muscle tone, often causing the child to go limp.
  When these happen together, they often result in drop attacks, where a child may suddenly fall to the ground ^[4][5].

While the seizures are the most visible part of the condition, EMAtS may be associated with learning or developmental difficulties, and is considered a developmental and epileptic encephalopathy. This means that both the frequent seizure activity and the underlying brain patterns can interfere with a child’s development ^[6].

Navigating the “Stormy Phase”

Many families describe a period of “seizure chaos” shortly after diagnosis. Clinicians often refer to this informally as the stormy phase ^[4]. This is a characteristic evolution of the syndrome where seizures become frequent, intense, and often resistant to the first few medications tried ^[7].

During this phase, you may observe:

• High Seizure Frequency: Children may experience dozens, or in severe cases, hundreds of brief seizures a day ^[8][9].
• Multiple Seizure Types: In addition to drop attacks, you may see generalized tonic-clonic seizures (convulsions), absences (staring spells), or prolonged states of confusion ^[1][3].
• Apparent Developmental Regression: Children may seem to “plateau” or lose previously mastered skills, such as speech or potty training ^[5]. It is vital to note that true developmental regression requires a prompt medical assessment. Apparent loss of skills can reflect ongoing seizures, medication side effects, sleep deprivation, or nonconvulsive status epilepticus—issues that your doctor can help evaluate and address.

The Emotional Impact on the Family

The sudden transition to managing a child with complex medical needs can cause what some experts call diagnostic trauma. Parents often experience:

• Hypervigilance: A constant, exhausting state of “waiting for the next fall,” which often leads to severe sleep deprivation for the whole family ^[10][11].
• Grief: Mourning the life you imagined for your child while simultaneously managing their new needs ^[12].
• Social Isolation: The difficulty of taking a child who may have a “drop attack” at any moment into public spaces can lead families to withdraw from social activities ^[12].

Treatment and the Path Forward

While the “stormy phase” is grueling, there is significant cause for hope. Research shows that over 60% of children with EMAtS in some cohorts eventually achieve complete seizure freedom ^[1][5].

Current management strategies emphasize:

1. Careful Medication Selection: Some common epilepsy drugs (like levetiracetam) can actually worsen seizures in some children with EMAtS ^[13][1]. Your doctor will carefully choose and monitor medications like valproate, clobazam, or ethosuximide ^[7].
2. Early Ketogenic Diet Consideration: The ketogenic diet (a medical diet supervised by specialists) has strong observational evidence in EMAtS. Experts frequently consider this diet early in treatment rather than waiting for multiple medications to fail ^[5][14].
3. Safety Planning: Because of the risk of injury from falls, children may wear specialized helmets, guided by their medical team ^[15].

The road to stability in EMAtS can be long, but the majority of children do eventually find a path to better seizure control ^[1].