• Autonomy (D) - NEGLECTED: The patient was asymptomatic (incidental finding). The surgeon is essentially pressuring/insisting on surgery without giving the patient the opportunity to weigh the risks and benefits and make their own informed choice. Autonomy requires that patients be given balanced information and allowed to decide for themselves.
• Non-maleficence (A): This means "do no harm." The surgeon is actually trying to prevent harm (cancer risk), so this principle is not being neglected - in fact, the surgeon believes they are acting to prevent future harm.
• Veracity (B): This refers to truth-telling. The surgeon is telling the truth about the cancer risk; there is no deception described.
• Beneficence (C): Acting in the patient's best interest. The surgeon believes surgery is in the patient's best interest, so they think they are fulfilling beneficence (even if paternalisticly).
• Justice (E): Fair distribution of healthcare resources. Not relevant here.

Reasoning: ATLS Primary Survey First

Breaking Down the Clinical Picture

Why FAST is the Next Step?

1. Neurogenic shock - possible due to cervical cord injury (loss of sympathetic tone)
2. Haemorrhagic shock - must be excluded first, as it is FAR more common and immediately life-threatening
3. FAST scan rapidly identifies intra-abdominal/pericardial haemorrhage at the bedside in under 3 minutes

You cannot assume hypotension is due to neurogenic shock alone until haemorrhagic causes are excluded. Missing an intra-abdominal bleed while attributing everything to neurogenic shock can be fatal.

Why Not the Other Options?

• B. CT spine / C. MRI spine: Spinal imaging is important but not the immediate next step. The patient needs haemodynamic stability addressed first. Also, CT spine would come before MRI in an acute trauma setting.
• D. Surgical intervention for cervical spine: Premature - imaging must confirm the lesion, and haemodynamics must be stabilised first.
• E. Vasopressin: Vasopressors may be needed for neurogenic shock, but only after haemorrhagic shock is excluded. Giving vasopressors to a patient bleeding into their abdomen would be dangerous - it would maintain BP while they exsanguinate internally. Norepinephrine (not vasopressin) is actually the preferred vasopressor for neurogenic shock if needed.

ATLS Primary Survey Sequence (ABCDE)

A - Airway (with C-spine protection) ✓ - collar in place
B - Breathing - assess
C - Circulation - BP 80/60 → FAST scan to rule out haemorrhage ← We are HERE
D - Disability (GCS 15)
E - Exposure

Regarding Neurogenic Shock vs. Haemorrhagic Shock

Option E: Vasopressin in Neurogenic Shock

What is Neurogenic Shock?

• Vasodilation - loss of vascular tone → BP drops
• Bradycardia - unopposed vagal tone (unlike haemorrhagic shock)
• Warm, dry skin - vasodilated peripheries

Why Was Vasopressin Listed as an Option?

• Binding V1 receptors on vascular smooth muscle
• Causing direct vasoconstriction - independent of the sympathetic system
• This is actually useful in neurogenic shock because the sympathetic system is down - vasopressin bypasses it entirely

Why Vasopressin is NOT the Next Step Here

If Neurogenic Shock IS Confirmed - What Vasopressor?

Summary

1. Haemorrhage must be ruled out first (FAST)
2. The tachycardia suggests haemorrhage, not pure neurogenic shock
3. Even for neurogenic shock, norepinephrine is first-line, not vasopressin

Why This is Compartment Syndrome

The Key Clinical Clues

Understanding High Voltage Electrical Burns

• Current travels through the body along the path of least resistance (nerves, blood vessels, muscles)
• Surface burns are minimal but internal/deep tissue destruction is massive
• Deep muscles undergo coagulative necrosis and oedema
• This causes massive swelling within the tight fascial compartments of the forearm
• The fascia does NOT expand → pressure rises → compartment syndrome

The 6 P's of Compartment Syndrome

The first two are already present. You do not need all 6 P's to act. Pain on passive movement + tense swelling = ACS until proven otherwise. Act immediately.

Why Fasciotomy (NOT Escharotomy)?

• The burns are not circumferential (entry and exit wounds are small)
• The problem is deep tissue oedema causing raised compartment pressure
• Cutting only the skin (escharotomy) will NOT decompress the deep fascial compartments
• Fasciotomy is required to release the deep fascia and decompress the muscles

Why the Other Options are Wrong

Sequence of Management

1. IMMEDIATE → Forearm Fasciotomy ← Answer
2. Concurrent → IV fluids (Parkland/Brooke formula, target UO 1-2 mL/kg/hr 
               for myoglobinuria)
3. Monitor → Urine for myoglobin (cola-coloured urine), CK levels, renal function
4. Later → Wound assessment, debridement, reconstruction

Understanding the Clinical Scenario

Why External Fixation First? (The Core Principle)

"Fix the bone BEFORE repairing the vessel"

The Reasoning:

• The unstable fracture continues to move
• Movement at the fracture site puts mechanical stress on the fresh vascular anastomosis
• The new repair can be disrupted, kinked, or torn during subsequent bone manipulation
• The graft/repair fails → limb lost

• The fracture is stabilised and immobilised
• The limb is brought to correct length and alignment
• The vascular surgeon now operates on a stable, still platform
• The anastomosis is protected from mechanical disruption
• Vascular repair is durable and protected

Why a Temporary External Fixator Specifically?

• Fast to apply (15-20 minutes) - does not significantly delay revascularisation
• Minimally invasive - pins placed away from the injury zone
• Does not interfere with the vascular field
• Provides sufficient stability for vascular repair
• Can be converted to definitive fixation (IM nail or plate) later once the limb is salvaged and soft tissues are assessed

The key word is "temporary" - this is a damage control orthopaedic (DCO) procedure, not definitive fracture management.

Why Not the Other Options?

• Time-consuming and operator-dependent
• In a limb with hard signs of vascular injury (absent pulses, cold limb), you do NOT need imaging to confirm - you already know surgery is needed
• The vascular team has already decided on exploration - further imaging just delays revascularisation
• Duplex is useful for soft signs of vascular injury (ABI <0.9, haematoma, bruit) where the diagnosis is uncertain

• Again, hard signs of ischaemia are already present - surgical exploration is already decided
• CTA would delay revascularisation (every minute of ischaemia = muscle death)
• CTA is useful when the level of injury is unclear or multiple injuries are suspected
• Not appropriate when exploration is already planned and limb is acutely ischaemic

• Fasciotomy is likely needed in this limb and should be done, but at the time of or after vascular repair - not before bone stabilisation
• Doing fasciotomy before bone fixation does not protect the vascular repair
• Standard practice: external fixation → vascular repair → fasciotomy (often done concurrently with repair)

• Systemic heparinisation has a limited role here
• The injury is mechanical/traumatic disruption of the vessel - not thrombosis
• Heparin risks bleeding in a polytrauma patient
• Some surgeons use regional (intra-arterial) heparin during vascular repair, but systemic IV heparin is not the immediate next step
• Also does not address the mechanical instability of the fracture

The Correct Sequence of Management

1. Damage control resuscitation (ATLS primary survey) - already underway
          ↓
2. Temporary external fixation of tibial fracture ← ANSWER
          ↓
3. Vascular exploration and repair
   (arterial reconstruction - vein graft most likely)
          ↓
4. Four-compartment fasciotomy
   (almost always done prophylactically after revascularisation 
    due to reperfusion oedema risk)
          ↓
5. Wound management, dressings
          ↓
6. Definitive fracture fixation (days later, once limb salvaged)

Ischaemia Time Awareness