Understanding Absence Seizures: Causes, Symptoms, and Treatment Options

Alan Lucks | MD

Medically reviewed by Alan Lucks | MD, Alan Lucks MDPC Private Practice - New York on January 8th, 2024.

Key Takeaways

  • Episodes last 10-30 seconds and occur when abnormal electrical bursts at 3 Hz (cycles per second) disrupt normal brain activity in the thalamus.
  • Children may experience 10-200 episodes daily, often going undiagnosed for months because teachers and parents mistake them for daydreaming or attention problems.
  • Ethosuximide is considered first-line treatment with 70-80% effectiveness rates, while valproic acid works for 75% of patients but carries weight gain and hair loss risks.
  • Hyperventilation for 3-5 minutes can trigger an episode during medical evaluation, helping doctors confirm the diagnosis through EEG monitoring.
  • About 65-70% of children completely outgrow these seizures by late adolescence, though 10-15% may develop other seizure types like tonic-clonic seizures.

Absence seizures, previously known as "petit mal" seizures, are a type of generalized seizure that affects approximately two out of every 1,000 people. These seizures are caused by abnormal and intense electrical activity in the brain, which disrupts the normal communication between nerve cells (neurons).

Symptoms of Absence Seizures

Absence seizures typically last between 10 and 30 seconds and are most common in children aged 4 to 15. During an absence seizure, the person may:

  • Abruptly stop whatever they're doing (talking, walking)

  • Appear to "stare into space"

  • Briefly lose consciousness without falling down or collapsing

After the seizure, the person recovers fully with no lingering confusion or other ill effects. These "spells" may occur infrequently or many times per hour.

Understanding Absence Seizures: Causes, Symptoms, and Treatment Options

Impact on Learning and Development

In children, absence seizures may interfere with learning and are often misinterpreted as daydreaming or inattention. It's essential for parents and teachers to be aware of the signs and symptoms of absence seizures to ensure that affected children receive proper support and treatment.

Potential Progression to Other Seizure Types

Approximately 25% of people who experience absence seizures may develop another type of generalized seizure called tonic-clonic seizures (formerly known as "grand mal" seizures). However, the vast majority of children will outgrow absence seizures over time.

Causes of Absence Seizures

The exact underlying causes of absence seizures are not fully understood. However, some research suggests that genetic factors may play a role in the development of this condition. Further studies are needed to better understand the mechanisms behind absence seizures.

Treatment Options

Treatment for absence seizures typically involves the use of anti-epileptic medications. These drugs work to reduce the abnormal electrical activity in the brain, helping to control seizures. Some commonly prescribed medications for absence seizures include:

  • Ethosuximide (Zarontin)

  • Valproic acid (Depakene)

  • Lamotrigine (Lamictal)

In addition to medication, lifestyle changes such as maintaining a regular sleep schedule, managing stress, and avoiding triggers may help reduce the frequency of absence seizures. Regular check-ups with a neurologist are essential to monitor the effectiveness of treatment and make any necessary adjustments.

Resources and Support

If you or your child are experiencing absence seizures, it's essential to seek support from healthcare professionals and organizations dedicated to epilepsy awareness and research. Some helpful resources include:

By staying informed and working closely with healthcare providers, individuals and families affected by absence seizures can effectively manage this condition and maintain a high quality of life.

The Bottom Line

Most children with properly treated absence seizures can attend regular school and participate in normal activities, with seizures typically disappearing by their late teens. Consistent medication adherence is crucial since missed doses can trigger breakthrough seizures that affect learning and safety. If you notice brief staring spells or "zoning out" episodes in yourself or your child, Doctronic can help you understand whether medical evaluation is needed.

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