The injured patient: a case-based trauma primary survey

The scene: why order matters

Imagine a young adult brought in by ambulance after being knocked off a bicycle by a car. The paramedics have given a short handover: fast collision, thrown a few metres, awake but confused. It is tempting to rush to the obvious bleeding leg wound. The trauma team does not. They know that a person can bleed dramatically from a limb yet still die faster from a blocked airway or a collapsed lung. So they work through the body in order of what kills quickest. The framework — airway, breathing, circulation, disability, exposure — was designed so nothing lethal is missed. Each letter is checked, treated, then rechecked. If the patient gets worse, the team returns to A and starts again. This discipline saves lives when everything is chaotic and time is short.

A and B: airway and breathing

First the team checks the airway — the tube that carries air to the lungs. They talk to the patient; a clear answer means air is moving and the brain has oxygen. If the airway were blocked by blood, vomit or swelling, they would clear and protect it, keeping the neck still in case the spine is injured. Next comes breathing. They look at how the chest rises, count the breaths, listen to both lungs and measure oxygen levels with a finger probe. A serious chest injury can trap air or blood around a lung and squash it, making breathing fail fast. Oxygen is given. Only once air is reliably reaching the lungs does the team move on. Breathing problems are common after a crash and can worsen quickly, so this step is repeated often.

C: circulation and bleeding

With air flowing, the team turns to circulation — the blood moving around the body. Serious injury often causes heavy bleeding, sometimes hidden inside the chest, tummy or pelvis where it cannot be seen. The team feels the pulse, checks how warm and pale the skin is, measures blood pressure and looks for obvious bleeding. Firm pressure or a tourniquet controls bleeding limbs. Two wide drips are placed so fluids and, when needed, blood can be given quickly. In our case the leg wound is packed and pressed. Modern UK trauma care favours giving blood early rather than large amounts of clear fluid, and treating the causes of bleeding fast. Losing too much blood starves organs of oxygen, so finding and stopping bleeding is urgent.

D and E: disability and exposure

D stands for disability, meaning a quick check of the brain and nerves. The team assesses how awake the patient is, often using a simple scoring scale, checks the pupils with a light, and measures blood sugar, because a low sugar can mimic a head injury. Our patient's confusion prompts close monitoring and a plan for an urgent brain scan. E stands for exposure: the team carefully removes clothing to look for other wounds, burns or bruising that might otherwise be missed, while keeping the patient warm, because cold blood clots poorly. They log-roll the patient to inspect the back. Throughout, the patient is kept comfortable and informed. After E, the team returns to A and reassesses, because injured patients can change from moment to moment.

After the survey: the bigger picture

Once the immediate threats are controlled, the team moves to a slower, head-to-toe secondary survey and arranges scans, X-rays and blood tests. In the UK, the most seriously injured are taken to a major trauma centre where surgeons, anaesthetists and specialists work together. A named team leader stands back and directs, keeping the picture calm and clear while others act. Families are updated and supported. The primary survey is not a one-off; it is a mindset that keeps rescuers focused on the deadliest problems first, in the same order every time. That reliability is exactly what makes it powerful, whether at the roadside, in a busy emergency department, or in a training scenario like this one.