Overview of Absence Seizures

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Absence Seizures. PHANIE / Getty Images

An absence seizure, often referred to as petit mal seizure, is a non convulsive seizure that is often not recognized as a seizure. It usually occurs among children who have epilepsy, but it can affect adults as well. While absence seizures are not as disruptive or obvious as convulsive seizures, they cause impairment of consciousness, and can interfere with learning, driving, and other aspects of life.

There are diagnostic tests that can confirm that a person is having an absence seizure, and there are effective medical treatments that can help reduce their frequency, Loved ones can learn to recognize absence seizures, which helps in terms of safety and monitoring the effectiveness of treatment.

Symptoms

Absence seizures can go unnoticed. They can occur several times a day, and they rarely cause disruption, noise or very obvious manifestations. Sometimes, a child may experience them for months before others begin to take notice.

What an absence seizure feels like

The person experiencing the seizure is usually not aware that it is happening. If you have an absence seizure, you will have impaired consciousness during this time, which means that you are not aware of your surroundings or your movements. After the seizure, you will quickly resume awareness and continue to do what you were doing before the seizure.

What an absence seizure looks like

If you observe someone having an absence seizure, they may appear as though they are not paying attention to you.

A child having them in a classroom can appear to be bored or daydreaming. A typical absence seizure manifests as a staring spell that can last between 10 and 30 seconds. Rapid blinking of the eyes or automatisms (purposeless movements), such as finger tapping or lip smacking may occur as well. Absence seizures are more noticeable if they occur during a physical task or an interactive conversation.

Causes 

Absence seizures are caused by abnormal electrical activity throughout the brain. This causes impairment of consciousness without causing jerking movements or physical convulsions. It is not always clear why a person develops this tendency, but absence seizures usually have a genetic component to them.

Most people who experience absence seizures do not experience other types of seizures. Some people who have absence seizures may have a family history of epilepsy. And conditions characterized with severe developmental delay and refractory (medication resistant) epilepsy such as Rett Syndrome, Lennox-Gastaut syndrome, and Dravet syndrome involve convulsive seizures as well as absence seizures.

Triggers

If you have absence seizures, some triggers can make a seizure more likely to occur, but they can occur without a known reason. Some common triggers include:

  • Fevers
  • Fatigue, sleepiness
  • Lack of food
  • Illness
  • Stress, anxiety
  • Changes in anti-convulsant doses or other medication changes

Diagnosis

Absence seizures are usually first noticed among children between the ages of four to eight, but they can also begin during early adolescence. Parents, teachers, coaches or other adults who have a familiarity with childhood behavior and habits may recognize the episodes as seizures, rather than just simple "boredom." A medical evaluation can help confirm the diagnosis so that treatment can be initiated.

Your child's doctor will begin by taking a careful medical history. Often, a brain MRI is needed to identify whether there is a lesion in the brain that could be causing the episodes. A temporal lobe lesion, for example, can cause temporal lobe seizures, which may also manifest with repetitive movements, and can be mistaken for absence seizures.

An electroencephalogram (EEG) will show a symmetrical 3 Hz spike and wave pattern. This is described as generalized seizure activity because it involves both sides of the brain, in contrast to focal seizure activity, which involves only one region of the brain. Often, the abnormalities on EEG can be elicited by hyperventilation, so your child may be asked to breath rapidly during the EEG so that the pattern can emerge.

Other possible conditions that may present as absence seizures include temporal lobe epilepsy, behavioral disorders such as attention deficit hyperactivity disorder (ADHD), manifestations of psychological problems such as post traumatic stress disorder (PTSD), or psychiatric conditions such as schizophrenia.

Treatment

Absence seizures are treated with specific anticonvulsant medications. If your child has convulsive seizures and absence seizures, this may require more than one anti-seizure medication to treat the different types of seizures.

The medications used for treatment of absence seizure are:

  • Ethosuximide (Zarontin)
  • Valproic acid (Depakene)
  • Lamotrigine (Lamictal)

Lifestyle management

In addition to treatment, your child should avoid triggers that worsen the seizures or that are known to make them more frequent.

Known seizure triggers include:

  • Sleep deprivation
  • Alcohol
  • Recreational drugs
  • Smoking
  • Hyperventilation or games that involve prolonged breath holding
  • Fevers (give your child medication to lower a fevers during an infection)
  • Skipping meals

Coping Tips for Loved Ones

If your child has absence seizures, there can be academic and social consequences, as well as safety concerns. You can address these issues pre-emptively with several strategies.

  • Academic: Be sure that your child gets adequate sleep, food and drink. Skipping meals and skimping on sleep, while very common for children and adolescents, can cause your child to miss out on class instruction, making him or her to fall behind. Be sure to discuss your child's condition with teachers and try to see if your child can borrow notes or slides in order to stay on top of class lessons.
  • Social: Staring spells can cause your child to miss out on group conversations and jokes or to blank out during interactions with others. Kids can be mean if they notice. Whether your child will discuss this with peers is a very individual decision based on the circumstances and the people involved.
  • Safety: In general, absence seizures do not cause falls or injuries. But, if they happen while driving or riding a bike, the loss of consciousness can cause an accident. Make sure that your child only participates in these activities if the seizures are well controlled.

A Word From Verywell

Absence seizures are typically a childhood condition. For children who do not have other types of seizures, absence seizures tend to stop on their own after adolescence. Often, children who have epilepsy characterized by multiple seizure types also experience a significant decrease in the absence seizure type after adolescence.

Absence seizures are not usually harmful in an obvious way, but they can cause misunderstandings. Family members, teachers, coaches, and friends can become angry when a child who has absence seizures seems to be ignoring them or not responding appropriately. It is a challenge, and your child will benefit if you create a loving and supportive family and social network.

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