What should you know about fainting with eyes open and shaking?

Eyes may remain open during a brief loss of consciousness, and short-lived shaking can occur when blood flow to the brain falls. A seizure is another possibility, particularly when movements are prolonged or recovery is slow. A clinician will consider the whole account, including warning sensations, posture, breathing and awareness afterwards. Dehydration, anaemia, low blood sugar and abnormal rhythms can also contribute to fainting.

A witness should avoid interpreting the event as proof of one condition. The timing of eye opening, the character of the shaking and the return of normal conversation are more useful than a label.

Move hazards away and cushion the head without holding the limbs down. Never put fingers, food or an object in the mouth. Check breathing when the shaking ends, place the person on their side if they are breathing, and remain nearby until alertness returns.

Call emergency services for breathing trouble, repeated episodes without recovery, a significant injury, severe chest pain, new weakness, persistent confusion or movements that do not stop. Arrange prompt review after a first unexplained blackout or any event with no warning.

Ask whether you need heart-rhythm monitoring, blood tests or a blood sugar check. Tell the clinician about sleep, illness, fluid intake, medicines, family history and the exact recovery pattern.