What should you know about vasovagal seizure?

During a vasovagal faint, reduced blood flow to the brain can cause a short loss of posture and occasional brief movements. Warning symptoms may include nausea, sweating, warmth, grey or narrowing vision, and light-headedness. Recovery often begins promptly after lying down, although tiredness can follow.

A seizure may involve sustained rhythmic jerking, stiffening, tongue injury, loss of bladder control, unusual behaviour, or prolonged confusion afterwards. These clues are not enough to diagnose the cause at home. Low blood sugar, alcohol withdrawal, meningitis, heart rhythm problems, and head injury can also produce collapse or abnormal movements.

Protect the person from nearby hazards, cushion the head, and note when the episode starts. Do not restrain them, put anything in the mouth, or give food or drink until they are fully alert. Once movements stop, place an unconscious but breathing person on their side and monitor breathing. If possible, ask a witness to describe posture, colour, movements, and recovery.

Do not drive, swim alone, climb, or operate machinery after an unexplained collapse until a clinician has advised you. Keep prescribed medicines available for review.

Call emergency services if movements last more than a few minutes, repeat without recovery, breathing is abnormal, the person remains unresponsive, or there is a serious injury. Get urgent help for fever with stiff neck, severe headache, new weakness, pregnancy, suspected poisoning, or possible alcohol withdrawal. A first seizure-like event, even after a possible faint, needs medical assessment.

Ask whether the warning symptoms and recovery fit fainting or suggest a seizure. Share witness accounts, medicines, alcohol changes, recent illness, sleep, food intake, and injuries. Ask whether you need heart monitoring, blood tests, brain assessment, or temporary activity restrictions.