What should you know about complex febrile convulsion?

During a convulsion, a child may become unresponsive, stiffen, jerk, roll their eyes or change breathing. A complex pattern can include a seizure lasting more than a short period, another seizure during the same illness, or movements mainly on one side. The fever may come from a viral or bacterial infection, but the seizure itself does not identify the cause.

Clinicians assess the child’s recovery, temperature, examination findings and possible source of infection. They may consider other explanations, including low blood sugar, medication or substance exposure, or an infection affecting the brain and its coverings. A child who remains drowsy, has neck stiffness or appears very unwell needs urgent assessment.

Place the child on a safe surface on their side, move nearby objects away, loosen tight clothing and note when the movements start. Do not restrain them, put anything in their mouth, or give food, drink or medicine until they are fully alert. Do not try to cool them with ice or cold water.

When the seizure stops, stay with the child and check that breathing is normal. Arrange medical review after a first seizure or any complex episode, even if the child seems better. Record the fever, seizure duration, movements, recovery and medicines given.

Call emergency services if the seizure is continuing, breathing is difficult, the child does not wake normally, another seizure follows, or the movements are strongly one-sided. Urgent assessment is also needed for a severe headache, repeated vomiting, a stiff neck, a purple or non-blanching rash, or unusual confusion. These features can occur with serious infection such as meningitis.

Ask what may have caused the fever, whether testing is needed, how to manage future fevers, and whether an emergency medicine or seizure plan is appropriate. Clarify which changes in alertness, breathing or movement should trigger immediate help.