Top Trauma Topics You Must Know for FRCEM

Topic priority at a glance

Trauma is a core Emergency Medicine exam domain because it tests prioritisation under pressure. In MRCEM SBA, FRCEM SBA and FRCEM OSCE, the key question is usually not the final diagnosis but the next safe action. Candidates lose marks when they choose CT, a definitive operation, or a detailed investigation before treating the immediate life threat. High-scoring answers recognise shock early, distinguish its likely cause, use focused imaging appropriately, and escalate to the right pathway without delay.

For UK exams and UK practice, trauma answers should align with structured resuscitation, NICE guidance, RCEM practice, Resuscitation Council UK principles, and contemporary damage control resuscitation. That means catastrophic haemorrhage control first if present, then ABCDE, early blood products rather than excessive crystalloid, TXA when indicated, warming, calcium replacement, and rapid progression to theatre, interventional radiology, neurosurgery, cardiothoracic input, or transfer to a Major Trauma Centre when required.

Why These Top Trauma Topics Matter for FRCEM

Trauma remains a major cause of death and disability, particularly in younger patients, but it also affects older adults with frailty, anticoagulation and occult injury after apparently minor mechanisms. In the ED, the first minutes matter. The commonest avoidable errors are failure to recognise occult haemorrhage, delay in treating obstructive shock, over-reliance on imaging in unstable patients, and failure to appreciate that traumatic brain injury changes blood pressure priorities.

Exam questions mirror these real-world problems. Typical high-yield scenarios include:

• Unstable blunt trauma with a positive FAST
• Penetrating chest trauma with shock and suspected tamponade
• Pelvic fracture with unexplained haemodynamic instability
• Head injury with hypotension, where permissive hypotension is unsafe
• Chest trauma with tension pneumothorax or massive haemothorax
• Burns with airway risk or fluid resuscitation thresholds
• Pregnant trauma patient requiring maternal-first resuscitation and anti-D consideration

Key Definitions

Essential Pathophysiology

The highest-yield trauma concept is shock differentiation. Trauma shock is not always haemorrhage, although haemorrhagic hypovolaemia is the commonest cause.

Examiners often test mixed shock. A patient may be bleeding and also have a tension pneumothorax, or have haemorrhage with concurrent TBI. The correct answer is the dominant immediate threat.

Trauma physiology is also worsened by the lethal triad of hypothermia, acidosis and coagulopathy. Hypocalcaemia from blood product administration further impairs clotting and myocardial function. Good trauma care prevents these problems early rather than trying to correct them late.

Clinical Presentation

Trauma presentations are often pattern-recognition questions. Common exam patterns include:

• Blunt trauma, tachycardia, hypotension, abdominal tenderness, positive FAST: likely intra-abdominal haemorrhage
• Pelvic pain or deformity after high-energy blunt trauma with shock: pelvic haemorrhage until proven otherwise
• Penetrating chest trauma, hypotension, distended neck veins or POCUS pericardial fluid: tamponade physiology
• Chest trauma, severe hypoxia, unilateral absent breath sounds, shock: tension pneumothorax
• Head injury with low GCS and hypotension: treat hypotension aggressively; do not use permissive hypotension
• Spinal trauma with hypotension and relative bradycardia after bleeding excluded: neurogenic shock
• Burns with facial burns, soot, hoarseness or stridor: inhalational injury risk

Remember compensated shock. A trauma patient can be critically unwell with tachycardia, cool peripheries and rising lactate before blood pressure falls.

Red Flags and High-Risk Features

• Catastrophic external haemorrhage
• Airway compromise, facial burns, expanding neck haematoma, stridor
• Tension pneumothorax
• Massive haemothorax
• Cardiac tamponade
• Positive FAST in an unstable blunt trauma patient
• Pelvic instability or high-risk mechanism with unexplained shock
• GCS 8 or less, or deteriorating conscious level
• Hypoxia or hypotension in suspected TBI
• Open skull fracture, focal neurology, post-traumatic seizure
• Anticoagulated head injury
• Pregnancy beyond 20 weeks with significant trauma
• Burns with inhalational injury, circumferential burns, electrical or chemical burns
• Older patient with apparently minor mechanism but significant physiology or anticoagulation

Differential Diagnosis

In trauma, differentials are often framed by physiology rather than organ system.

Shock in trauma

• Haemorrhagic hypovolaemia
• Tension pneumothorax
• Cardiac tamponade
• Massive haemothorax
• Blunt cardiac injury or dysrhythmia
• Neurogenic shock
• Less commonly, medical causes precipitating trauma such as MI, PE or sepsis

Chest trauma deterioration

• Tension pneumothorax
• Open pneumothorax
• Massive haemothorax
• Pulmonary contusion
• Flail chest
• Cardiac tamponade
• Mainstem intubation if ventilated

Reduced GCS after trauma

• Traumatic brain injury
• Hypoxia
• Hypotension and shock
• Alcohol or drugs
• Hypoglycaemia
• Seizure or post-ictal state

Initial ED Assessment

Use a structured trauma approach. In exams, safe sequencing matters.

1. C-ABCDE

• Catastrophic haemorrhage: direct pressure, haemostatic dressing, tourniquet, pelvic binder if indicated
• Airway with cervical spine protection
• Breathing: oxygenation, ventilation, chest examination, immediate treatment of tension pneumothorax
• Circulation: pulse, BP, perfusion, external bleeding, pelvic assessment, access, bloods, major haemorrhage activation
• Disability: GCS, pupils, glucose, lateralising signs
• Exposure: full examination, temperature control, log roll only when appropriate and safe

2. Early escalation

• Activate trauma team or major trauma call
• Activate major haemorrhage protocol if indicated
• Call theatre, interventional radiology, trauma surgery, neurosurgery, cardiothoracic surgery or burns service early where relevant

3. Monitoring and access

• Continuous ECG, SpO2, BP, ETCO2 if intubated
• Two large-bore IV cannulae or rapid IO access if needed
• Arterial line later if appropriate, but do not delay resuscitation
• Warm patient and warm fluids or blood products

4. Focused adjuncts during primary survey

• eFAST if it will change immediate management and does not delay treatment
• Portable chest and pelvic X-ray in selected unstable patients if useful and immediately available
• VBG or ABG for lactate, base deficit and calcium

5. Key exam rule

If the patient is unstable, the answer is usually a resuscitative intervention or escalation step, not CT.

Investigations

Bedside and laboratory tests

• VBG or ABG: lactate, base deficit, pH
• FBC
• U&Es
• Coagulation screen
• Group and save or crossmatch
• Fibrinogen if available in major haemorrhage pathways
• Calcium
• Troponin and ECG if blunt cardiac injury suspected
• Pregnancy test where relevant

eFAST and POCUS

Use focused ultrasound to answer immediate questions:

• Is there pericardial fluid?
• Is there grossly poor cardiac filling or contractility?
• Is there pneumothorax or haemothorax?
• Is there intraperitoneal free fluid?

Important exam points:

• Tension pneumothorax is a clinical diagnosis. Do not wait for ultrasound in an unstable patient.
• Absent lung sliding supports pneumothorax in the right context but is not specific.
• A positive FAST in unstable blunt trauma is management-changing.
• A negative FAST does not exclude major haemorrhage, especially pelvic or retroperitoneal bleeding.
• Pericardial fluid in unstable penetrating trauma suggests tamponade and urgent senior operative escalation.

CT imaging

CT is for patients who are stable enough to leave resus or whose pathway specifically requires it after immediate threats are addressed.

NICE head CT: high-yield adult triggers

For adults with head injury, CT head within 1 hour if any of the following are present:

• GCS 12 or less on initial assessment
• GCS less than 15 at 2 hours after injury
• Suspected open or depressed skull fracture
• Any sign of basal skull fracture
• Post-traumatic seizure
• Focal neurological deficit
• More than one episode of vomiting

CT head within 8 hours for adults with any loss of consciousness or amnesia since the injury plus any of:

• Age 65 or over
• Any current bleeding or clotting disorder, including anticoagulant use
• Dangerous mechanism of injury
• More than 30 minutes of retrograde amnesia before the injury

Always check the current NICE head injury guideline for full detail and updates, especially around anticoagulants and antiplatelets.

NICE cervical spine imaging: high-yield principles

CT cervical spine is indicated in adults with suspected cervical spine injury if there is:

• GCS less than 13 on initial assessment
• Intubation
• Focal peripheral neurological signs
• Paraesthesia in upper or lower limbs
• Strong clinical suspicion of injury despite normal plain assessment
• Dangerous mechanism or inability to safely assess range of movement in line with NICE criteria

For exam purposes, know the broad rule: high-risk mechanism, abnormal neurology, reduced consciousness, or inability to clinically clear the neck usually means CT rather than plain films in adults.

Management in the Emergency Department

Core trauma management priorities

1. Control catastrophic haemorrhage
2. Secure airway if needed, with cervical spine protection
3. Treat immediately reversible breathing problems
4. Recognise shock early and identify the likely mechanism
5. Activate major haemorrhage protocol when appropriate
6. Use blood products early and minimise crystalloid
7. Give TXA early if indicated and within 3 hours of injury
8. Prevent hypothermia and replace calcium
9. Escalate early to theatre, IR, neurosurgery, cardiothoracic surgery or transfer pathway

Major haemorrhage and damage control resuscitation

Think major haemorrhage in any trauma patient with actual or suspected life-threatening bleeding, especially with shock, ongoing blood loss, pelvic injury, positive FAST, major chest bleeding, multiple long-bone fractures, or penetrating trauma.

Key principles:

• Stop the bleeding: pressure, tourniquet, haemostatic dressing, pelvic binder, chest intervention, theatre or IR
• Activate local major haemorrhage protocol early
• Use blood products rather than repeated crystalloid boluses
• Warm the patient and all fluids or blood products where possible
• Check and replace calcium during ongoing transfusion according to local protocol
• Monitor lactate, base deficit, coagulation and fibrinogen where available
• Do not delay haemostasis while trying to normalise physiology

TXA:

• Give as early as possible and within 3 hours of injury in major trauma patients with active or suspected significant bleeding
• Common adult regimen in UK practice: 1 g IV over 10 minutes, then 1 g IV over 8 hours
• Do not give late for traumatic bleeding beyond 3 hours after injury

Permissive hypotension:

• Consider in selected exsanguinating trauma patients without suspected TBI while awaiting haemorrhage control
• The aim is adequate perfusion, not normal blood pressure before haemostasis
• Common exam framing is maintaining a radial pulse or SBP around 80 to 90 mmHg in selected patients, but this is not a universal target
• Do not use permissive hypotension in suspected or confirmed TBI

Chest trauma

Tension pneumothorax

• Clinical diagnosis in an unstable patient
• Features: severe respiratory distress, hypoxia, unilateral reduced air entry, shock, peri-arrest state
• Immediate treatment: chest decompression without waiting for imaging
• In UK trauma practice, finger thoracostomy may be used in the appropriate setting by trained clinicians; otherwise immediate needle decompression followed by definitive chest drain according to local protocol and operator competence

Massive haemothorax

• Suspect with shock, reduced air entry, dullness, chest trauma and large pleural blood collection
• Requires urgent chest drainage and senior trauma/thoracic escalation
• Think ongoing intrathoracic haemorrhage and need for operative control

Open pneumothorax

• Apply an appropriate vented dressing or three-sided dressing according to local practice and urgent chest drain away from