The Collapsed Patient: Blackouts and Syncope

The case: a sudden collapse

Imagine a woman in her 60s who is standing in a warm supermarket queue. She feels hot, sweaty and sick, her vision goes grey, and the next thing she knows she is on the floor with a worried crowd around her. She was out for less than a minute and quickly felt herself again, although a little washed out. A bystander says she looked very pale and there were a few small twitches of her arms. In the teaching setting, this picture is classic for a simple faint, known as vasovagal syncope. The warning signs beforehand — heat, nausea, greying vision — are typical. The short twitches can happen with any faint and do not always mean a seizure. The job now is to confirm the cause and rule out anything dangerous.

Taking the history: the clues that matter

Doctors learn most from the story around the event. They ask what the person was doing just before: standing for a long time, coughing, passing urine, or getting up quickly all point to a simple faint. They ask about warning symptoms; a faint with clear warning is usually benign, while collapse with no warning is more worrying. They ask what a witness saw, how long the person was out, and how quickly they recovered. A fast recovery suggests syncope, while long confusion afterwards suggests a seizure. Crucially, they ask about collapse during exercise, palpitations before the event, chest pain, and any family history of sudden death in a young relative. These last points hint at a heart cause and always raise concern, even when the person now feels fine.

Examination and simple tests

The examination is focused and practical. Staff check the pulse and blood pressure, including a reading lying down and after standing, to look for a drop that causes light-headedness (postural hypotension). They listen to the heart for murmurs that could signal a narrowed valve and check for signs of dehydration, bleeding or anaemia. In UK practice, a 12-lead ECG (a heart tracing) is recommended for almost everyone who has fainted, because it can spot rhythm and electrical problems that are otherwise silent. Blood tests may look for anaemia or low blood sugar. Most people with a clear simple faint, a normal examination and a normal ECG need nothing more. The tests are there to catch the smaller group whose faint is a warning of heart disease.

Red flags and dangerous causes

Certain features move a faint from harmless to urgent. Fainting during exercise, or while lying down, is a red flag. So is collapse with no warning, palpitations just before, chest pain, or breathlessness. An abnormal ECG, a heart murmur, heart failure, or a family history of sudden cardiac death in someone under 40 all raise concern for a cardiac cause such as an abnormal rhythm or a structural heart problem. Sudden collapse with a severe headache, weakness or slurred speech needs emergency assessment for a brain cause. Fainting in an older person on several blood-pressure medicines, or with unexplained falls, also deserves careful review. When any red flag is present, the safe route is urgent assessment rather than reassurance.

Management and safety-netting

For a simple faint, the plan is mostly education and reassurance. People learn their triggers, spot the warning signs early, and act fast — sitting or lying down and raising the legs can stop a faint before it happens. Staying well hydrated and standing up slowly helps, and any medicines that lower blood pressure are reviewed. People who faint are usually advised not to drive until assessed, and there are specific DVLA rules depending on the cause; a clinician can advise. If a cardiac cause is suspected, referral to a heart specialist and heart-rhythm monitoring follow. The key safety message is to seek urgent help for any faint linked to exercise, chest pain, palpitations, injury, or repeated episodes, and to phone 999 if someone does not wake up promptly.