Introduction
Syncope is the medical word for a short loss of consciousness, often described as fainting or a blackout. It happens when the brain briefly receives too little blood flow. This can be caused by a simple fainting reflex, but occasionally a heart rhythm or structural heart problem is involved.
Our experience
- The detail around the event matters: warning symptoms, posture, exertion and recovery all help guide assessment.
- An ECG, heart rhythm monitoring and an echocardiogram may be used when a heart cause needs to be considered.
- A blackout during exercise, without warning, or alongside chest pain or palpitations needs prompt medical attention.
Patient note
“Most faints have an explanation that is not dangerous. A careful account from you, and from anyone who saw the event, is often the most useful place to begin.”
FAQ
Is a blackout always caused by the heart?
No. Common causes include a fainting reflex, dehydration or a drop in blood pressure. A heart assessment is important when the circumstances or your history suggest a possible cardiac cause.
When should I seek urgent help?
Call 999 if a blackout occurs with chest pain, severe breathlessness, a persistent fast heartbeat, serious injury, or if the person does not recover promptly. If you are concerned, seek urgent medical advice.
What should someone who saw the event tell us?
Details such as what you were doing, colour change, movements, duration and how quickly you recovered can be very helpful. If possible, bring an account from a witness.
Can I drive after a blackout?
Driving advice depends on the cause and circumstances. Please raise this at your assessment and follow DVLA guidance where relevant.