The Primary Survey Explained: From DRSABCD to ABCDE
Every paramedic and nursing student learns the primary survey early, and almost everyone gets confused by the letters at some point. Is it DRSABCD or ABCDE? Is C for CPR or circulation? Is D for defibrillation or disability? The short answer is that both are correct, because they are two tools for two different situations. Understanding why makes the whole assessment far easier to remember under pressure.
Two versions of the same idea
DRSABCD is the basic life support sequence used in the Australian and New Zealand resuscitation guidelines. It is designed for a collapsed person who may be in cardiac arrest: Danger, Response, Send for help, Airway, Breathing, CPR and Defibrillation. Its job is to get compressions and a defibrillator to a person who needs them as quickly as possible.
ABCDE is the structured clinical assessment used for any unwell or injured patient who is not in cardiac arrest: Airway, Breathing, Circulation, Disability and Exposure. In trauma it is often written as cABCDE, with catastrophic haemorrhage controlled first, because massive external bleeding can kill faster than an airway problem. The principle behind both is the same. You find and treat the problems that will kill the patient soonest, in that order, before moving on.
Find the thing that will kill the patient first, fix it, then move to the next letter.
Danger and response
Before you touch anyone, check the scene for danger to yourself, your crew, bystanders and the patient: traffic, fire, electricity, sharps, aggression or an unstable structure. You cannot help anyone if you become a patient yourself. Then assess response. A quick AVPU check (Alert, responds to Voice, responds to Pain, Unresponsive) gives an immediate sense of how sick the patient is and whether you need more help straight away.
Airway
Is the airway open and clear? Listen for noisy breathing such as snoring, gurgling or stridor, and look for vomit, blood, swelling or foreign bodies. A patient who is talking normally has a patent airway for now. Simple manoeuvres such as positioning, suction and airway adjuncts come before anything advanced. In trauma, protect the cervical spine according to your local guidelines while you manage the airway.
Breathing
Look, listen and feel. Count the respiratory rate over a full 30 to 60 seconds rather than guessing, because it is one of the most sensitive early signs of deterioration. Check oxygen saturation, chest movement and symmetry, work of breathing and accessory muscle use, and listen to air entry on both sides. Treat what you find, such as positioning, oxygen for hypoxaemia or assisted ventilation, before moving on.
Circulation
Assess pulse rate and quality, skin colour, temperature and moisture, capillary refill and blood pressure. Look for obvious bleeding and think about hidden blood loss into the chest, abdomen, pelvis and long bones. A cool, pale, sweaty patient with a fast pulse is shocked until proven otherwise, even if the blood pressure is still normal, because blood pressure often falls late.
Disability
Disability means neurological status. Recheck the level of consciousness using AVPU or the Glasgow Coma Scale, look at the pupils and check a blood glucose level. Hypoglycaemia is one of the most common reversible causes of an altered conscious state, and it is easy to miss if you don't measure it.
Exposure
Expose the patient enough to find injuries, rashes, bleeding or other clues you would otherwise miss, while protecting their dignity and keeping them warm. Check temperature. Hypothermia worsens bleeding and outcomes in trauma, so cover the patient again once you have looked.
The primary survey is a loop, not a list
The most common mistake students make is treating the primary survey as something you do once at the start. Patients change. Reassess after every intervention, whenever the patient's condition changes and before you move them. If something gets worse, go back to A and work through again. The secondary survey, a detailed head to toe examination and history, only comes once the primary survey problems are under control.
Check danger before you approach, every time.
Treat problems as you find them rather than finishing the whole list first.
Measure the respiratory rate and blood glucose instead of estimating.
Reassess after each intervention and before every move.
Conclusion
DRSABCD gets a collapsed patient the CPR and defibrillation they may need. ABCDE gives every other sick or injured patient a structured, prioritised assessment. Learn both, know which one you are using and why, and practise until the sequence runs automatically. That frees your thinking for the patient in front of you.
References
Australian and New Zealand Committee on Resuscitation (ANZCOR). Guideline 8: Cardiopulmonary Resuscitation. Australian Resuscitation Council.
Thim T, Krarup NH, Grove EL, Rohde CV, Løfgren B. Initial assessment and treatment with the Airway, Breathing, Circulation, Disability, Exposure (ABCDE) approach. Int J Gen Med. 2012;5:117.
American College of Surgeons Committee on Trauma. Advanced Trauma Life Support (ATLS) Student Course Manual. 10th ed. Chicago: American College of Surgeons; 2018.
Resuscitation Council UK. The ABCDE approach. London: Resuscitation Council UK.
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Disclaimer: This article is general education for students. It is not medical advice, and it does not replace your service's clinical practice guidelines, your educators or your local protocols.
