Symptoms, Triggers, and Daily Presentation of PMA

Living with a child who has Perioral Myoclonia with Absences (PMA) means becoming a keen observer of very subtle physical changes. Because PMA episodes are brief and often look like simple daydreaming or a facial tic, understanding the “signature” look of these events is key to managing your child’s care.

The Anatomy of an Episode

A typical PMA episode has two main components that happen at the same time: a loss of awareness and a specific type of facial movement.

• The Absence (Staring): Your child will suddenly stop what they are doing. This is often called behavioral arrest. They may have a blank stare, become unresponsive to their name, and seem “checked out” from their surroundings ^[1].
• The Perioral Myoclonia (Mouth Twitching): While they are staring, you will see rhythmic, involuntary twitching or contractions around the mouth ^[2]. This most often involves the orbicularis oris (the muscle that circles the lips), causing the corners of the mouth or the lips to twitch upward or outward ^[3].

These events are typically very short. In documented cases, episodes often last between 10 to 15 seconds, though this duration can vary ^[1]. Once the seizure ends, most children return to their normal activity immediately, though they usually have no memory of the brief “gap” in their day.

Other Physical Signs

While the mouth twitching is the defining feature, it is not always the only movement. Some children may experience axial-appendicular myoclonus, which are brief, involuntary jerks of the trunk (the body’s core) or the limbs ^[3]. These jerks happen alongside the staring and mouth twitching but are generally less prominent than the facial movements.

The Role of Overbreathing (Hyperventilation)

A common clinical test to trigger a PMA event is hyperventilation, or rapid, deep breathing. In clinical studies, about 63% of children with PMA had a seizure triggered during an EEG when asked to breathe deeply and quickly ^[2].

During a medical evaluation, the doctor will likely use this activation procedure to “capture” a seizure on the EEG monitor to confirm that the mouth movements and the brain’s electrical activity are time-locked (closely linked) ^[2][1].

Important Note on Daily Activities: Hyperventilation is a supervised medical test. While activities that involve fast breathing might occasionally provoke an event, you should generally not restrict your child’s ordinary exercise, play, or laughter unless your treating team gives individualized advice. Deliberately testing hyperventilation at home is also not recommended. It can be helpful to keep a simple seizure diary noting episode length and recovery, and to share safely recorded videos with the clinician.

First Aid and When to Seek Emergency Care

Most PMA events are brief and resolve on their own without medical intervention. They are not typically considered life-threatening emergencies. However, you should be aware of a rare but serious complication called status epilepticus ^[4].

Basic First Aid: If you witness a seizure, time the event, protect the child from injury, do not restrain them, and never put anything in their mouth.

You should contact emergency services if:

• You witness a convulsive (full-body shaking) seizure that lasts longer than 5 minutes, or the child has repeated seizures without regaining awareness in between ^[5].
• The child has a seizure that involves full-body stiffening or rhythmic shaking of the arms and legs (a tonic-clonic seizure) and they have breathing difficulty or injury ^[6].
• The event meets the emergency thresholds outlined in your child’s personalized Seizure Action Plan, or your child remains unusually sleepy for a prolonged period after the twitching stops.

For the vast majority of families, PMA is managed at home with daily medication and regular follow-ups with a neurologist. Understanding these daily patterns helps you provide the clear, descriptive information your child’s care team needs to fine-tune their treatment.