Vascular Trauma

Basics & Clinical Clues - The Red Alert

• Definition: Injury to arteries or veins, potentially limb/life-threatening.
• Mechanisms:
  • Penetrating: Gunshot, stab.
  • Blunt: Fractures, dislocations, crush.
• Initial Steps: ABCDEs; control hemorrhage (direct pressure).
• Hard Signs (⚠️ RED ALERT - Direct to OT):
  • Pulsatile bleeding
  • Expanding hematoma
  • Palpable thrill / Audible bruit
  • Absent distal pulses
  • Distal ischemia (6 P's)
• Soft Signs (Investigate: ABI, CT Angio):
  • History of arterial bleeding
  • Injury proximity to major vessel
  • Small, stable hematoma
  • Associated nerve injury
  • Diminished pulses
• 📌 6 P's of Acute Limb Ischemia: Pain, Pallor, Pulselessness, Paresthesia, Paralysis, Poikilothermia.

⭐ Hard signs of vascular injury mandate immediate surgical exploration, often bypassing further imaging.

Diagnostic Workup - Spotting the Leak

• Initial step: Differentiate hard vs. soft signs of vascular injury.
  • Hard signs: Active hemorrhage, expanding hematoma, thrill/bruit, absent distal pulses, ischemia (📌 6 P's) → Immediate OR.
  • Soft signs: Hx of significant bleed, diminished pulses, proximity injury, nerve deficit → Further workup.
• Investigations for Soft Signs/Proximity:
  • Ankle-Brachial Index (ABI): Bedside. ABI < 0.9 indicates likely arterial injury.
  • Duplex Ultrasonography (DUS): Non-invasive, operator-dependent. Good for neck, extremity.
  • CT Angiography (CTA): Modality of choice for stable patients. High sensitivity & specificity.

    ⭐ CTA is the gold standard for diagnosing hemodynamically stable patients with suspected peripheral vascular trauma, offering detailed anatomical information.

  • Conventional Angiography: Invasive. Gold standard if therapeutic intervention (e.g., embolization, stenting) is anticipated.

Treatment Strategies - Plugging the Holes

• Initial Control & Resuscitation:
  • Direct pressure; tourniquet (last resort, document application time).
  • ATLS: Permissive hypotension (target SBP 80-90 mmHg) until definitive hemorrhage control.
  • Balanced transfusion: 1:1:1 (PRBC:FFP:Platelets).
• Surgical Principles & Techniques:
  • Achieve proximal & distal vascular control. Use vessel loops, clamps, or Fogarty catheter for temporary occlusion.
  • Repair Options:
    • Lateral arteriorrhaphy (simple lacerations).
    • End-to-end anastomosis (clean transections).
    • Interposition graft: Autologous vein (e.g., saphenous) ideal, especially in contamination. Prosthetic if vein unavailable/large vessel.
    • Ligation: For non-critical arteries if limb perfusion adequate.
  • Damage Control Surgery (DCS): Temporary Intravascular Shunt (TIVS) to restore flow quickly in unstable patients or complex injuries.
• Adjunctive Measures:
  • Fasciotomy: Mandatory for established compartment syndrome or prophylactically if ischemia > 4-6 hours.
• Endovascular Management (selected cases): Covered stents for pseudoaneurysms/fistulas; embolization for non-critical vessel bleeding.

⭐ Prophylactic fasciotomy is indicated if revascularization occurs after 4-6 hours of warm ischemia time to prevent reperfusion injury and compartment syndrome.

Complications & Regional Injuries - Aftermath & Hotspots

• Immediate/Early Complications:
  • Persistent Hemorrhage, Re-thrombosis
  • Compartment Syndrome (⚠️ intracompartmental pressure >30 mmHg or ΔP < 30 mmHg; requires fasciotomy)
  • Infection, Missed associated injuries
• Late Sequelae:
  • Pseudoaneurysm, Arteriovenous Fistula (AVF)
  • Chronic Limb Ischemia, Claudication
  • Venous Thromboembolism (VTE), Neuropathy, Chronic Pain
  • Amputation
• Key Regional Considerations:
  • Neck (Zones I,II,III): Vertebral artery injury (posterior stroke risk).
  • Thorax: Great vessel injury (e.g., Aorta, SVC, PA); high mortality.
  • Abdomen: Retroperitoneal hematoma; Aorto-iliac/caval injuries.
  • Extremities:
    • Popliteal artery (⚠️ highest amputation risk if repair delayed > 6-8 hrs).
    • Brachial artery (risk of Volkmann's ischemic contracture).

⭐ Hard signs of vascular injury (Pulsatile bleeding, Palpable thrill, Audible bruit, Expanding hematoma, Signs of distal ischemia) mandate surgical exploration.

High‑Yield Points - ⚡ Biggest Takeaways

• Hard signs (pulsatile bleed, expanding hematoma, absent pulse, thrill/bruit) mandate surgical exploration.
• Soft signs (history of bleed, diminished pulse, nerve deficit) warrant CTA or Doppler.
• ABI < 0.9 indicates arterial injury in extremity trauma; investigate.
• Compartment syndrome (pain out of proportion, 6 Ps) requires urgent fasciotomy.
• Temporary shunts are limb-saving in damage control or delayed repair.
• Proximal and distal control is key before vascular repair.
• Blunt aortic injury commonly occurs at the aortic isthmus.