Penetrating neck trauma

Background

Zones of Neck

• Defined by platysma violation
  • Assume significant injury has occurred until proven otherwise
  • Never probe neck wounds beneath the platysma (may disrupt hemostasis)
• Multiple structures are injured in 50%
  • Stab wound can enter in one zone and damage another
• Missed esophageal injury is leading cause of delayed death
• GSW that crosses midline of 2x as likely to cause injuries to vital structures
• Blunt cervical vascular injury should be treated with systemic anticoagulation
• Penetrating injury rarely results in unstable fracture

Clinical Features

Hard vs. Soft Neck Signs

Hard Signs	Soft Signs
Airway compromise	Subcutaneous emphysema
Air bubbling wound	Dysphagia, dyspnea
Expanding or pulsatile hematoma	Non-pulsatile, non-expanding hematoma
Active Bleeding	Venous oozing
Shock, compromised radial pulse	Chest tube air leak
Hematemesis	Minor hematemesis
Neuro Deficit/Paralysis/Cerebral ischemia	Paresthesias

Differential Diagnosis

Injuries Patterns by Zone

Zone	Anatomic Landmarks	Potential Injuries
1	clavicle to cricoid	subclavian artery and vein jugular vein common carotid artery trachea thryroid esophagus apex of the lung
2	cricoid to angle of mandible	carotid arteries internal jugular vein esophagus larynx cranial nerves X, XI, and XII spine
3	angle of mandible to base of skull	lateral pharynx cranial nerves VII, IX, X, XI, and XII spine carotids

Evaluation

Algorithm for CTA Neck after penetrating trauma]

Evaluation (WTA Algorithm)

• If hard signs or HD instability, attempt tamponade, secure airway, then OR.
• If no hard signs and yet suspect injury, CTA.

Imaging Options

• CXR
  • Pneumo/hemothorax, pneumomediastinum
• CTA
  • 1st line
• Angiography
  • Gold-standard
  • Useful if embolization or stent placement are anticipated or CT inconclusive

Management

General

• Airway
  • If integrity of larynx is in question trach may be safer than intubation
  • One attempt at intubation by most experienced provider with tube one size smaller
    • If failure, surgical airway should be performed
    • Emergency tracheostomy preferred to cricothyrotomy
  • Consider intubation if:
    • Stridor
    • Hemoptysis
    • Subcutaneous emphysema
    • Expanding hematoma
• Breathing
  • Minimize BVM (positive pressure > air into soft tissue plains)
• Circulation
  • Place IV on contralateral side of injury
• Disability
  • Neuro deficits may be secondary to direct cord injury or cerebral ischemia secondary to carotid injury
  • Place in C-collar if:
    • ALOC, neuro deficits, or significant blunt injury

By Zone

Zone I

• Portable CXR
• Evaluation is generally by selective, nonoperative management
• Vascular control can be difficult; requires thoracic surgical approach

Zone II

• Optimal management is controversial
  • Platysma
    • Not penetrated: obs and discharge
    • Penetrated and vitals/airway stable: CT angio of neck
    • Penetrated and unstable, expanding hematoma: OR
• All bleeding should be controlled with pressure, not with clamps

Zone III

• Treat as cranial injuries
• Evaluation is generally by selective, nonoperative management
  • Routine exploration of zone III is not indicated

By Structure

Esophagus

• Injuries are often initially asymptomatic
  • If missed can lead to neck space infection, mediastinitis
• Esophagoscopy or contrast esophagography indicated if:
  • CT is equivocal or abnormal
  • Missile trajectory places esophagus at risk for injury
  • Persistent symptoms

Laryngotracheal

• Suspect if:
  • Air bubbling through wound
  • Dyspnea, stridor
  • Hemoptysis
  • Subcutaneous emphysema
• Laryngoscopy is indicated if:
  • Suspect laryngotracheal injury even if CT is negative

Disposition

• If CT is negative, may observe patient

See Also

• Spinal cord trauma
• Blunt neck trauma
• Head trauma (main)