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Difficulty: MediumCardiothoracic and Vascular Surgery

A 27-year-old male is transported to the trauma bay after sustaining a knife wound to his right thigh during an altercation. On initial assessment, the patient is diaphoretic and confused. Vital signs show a heart rate of 134/min and a blood pressure of 80/42 mmHg. Examination of the right lower extremity reveals a 4-cm laceration over the anteromedial thigh with a rapidly expanding, pulsatile swelling beneath the skin. The right foot is markedly pale compared to the left, and no pulses are audible on Doppler ultrasound over the right dorsalis pedis or posterior tibial arteries. Intravenous access is established and rapid crystalloid infusion is started. Which of the following is the most appropriate next step in management?

  1. Immediate operative explorationAnswer
  2. B
    CT angiography of the right lower extremity
  3. C
    Duplex ultrasonography of the right thigh
  4. D
    Bedside local wound exploration
  5. E
    Measurement of the injured extremity ankle-brachial index

Answer

Immediate operative exploration
The correct action is to proceed directly to the operating room. This patient presents in hemorrhagic shock with 'hard signs' of arterial injury (a rapidly expanding pulsatile hematoma, absent distal pulses, and pallor). The presence of any hard sign (which also includes palpable thrill, audible bruit, active pulsatile bleeding, and localized distal ischemia) is an absolute indication for emergent surgical exploration. Delaying definitive surgical care for any imaging studies in this context risks irreversible tissue damage, limb loss, and death.

Step-by-Step Solution

1
Identify the patient's hemodynamic status based on vital signs and mental status.
The patient is in hypovolemic shock (hypotension, marked tachycardia, confusion, diaphoresis).
Hemodynamic instability fundamentally alters the trauma management algorithm, prioritizing immediate life-saving interventions over diagnostic workups.
2
Evaluate the physical examination findings of the injured extremity.
The patient has an expanding pulsatile hematoma and absent distal pulses with pallor.
These findings constitute 'hard signs' of penetrating vascular injury.
3
Determine the appropriate management pathway for unstable patients with hard signs of vascular injury.
Immediate transport to the operating room for surgical exploration is required.
Any delay for imaging (like CT or duplex) or inappropriate bedside procedures increases the risk of exsanguination and limb loss.

Key Concept

Management of penetrating extremity vascular trauma and the indications for immediate surgical exploration.
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Topics

Cardiothoracic and Vascular Surgery

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