Vascular Trauma

Background

Vascular trauma is among the most time-critical problems in surgery, with risk of exsanguination, ischemia, compartment syndrome, limb loss, and death. ^[1]

Epidemiology and mechanisms

• Vascular injury occurs in a minority of major trauma admissions, but disproportionately contributes to preventable death due to hemorrhage. ^[2]
• Civilian vascular trauma remains predominantly penetrating in many regions, while iatrogenic vascular injury (arterial access, endovascular and cardiac procedures) is increasingly common. ^[3]
• Mortality is highest in non-compressible torso hemorrhage and major junctional injuries; outcomes depend on rapid hemorrhage control and access to definitive repair. ^[1]

Modern management paradigm (EVTM and damage control)

• Contemporary care integrates open, endovascular, and hybrid options, aiming for rapid hemorrhage control with staged definitive repair ('damage control vascular surgery'). ^[4]
• Endovascular adjuncts (embolization, balloon occlusion, stent-grafts) and hybrid workflows are now central to many high-acuity scenarios. See 16EndoVascular Trauma Management (EVTM). ^[4]
• For thoracic aortic trauma and selected junctional injuries, outcomes have improved with endovascular-first strategies in appropriate anatomy and physiology. ^[5]

Etiology and Mechanisms

Table 14.2. Classification of Vascular Trauma by Mechanism ^[1]

Note: Iatrogenic vascular trauma is a growing category due to increasing endovascular interventions ^[3].

Pathophysiology

• Hemorrhage: rapid exsanguination → hypovolemic shock, coagulopathy, acidosis.
• Ischemia: arterial occlusion → tissue necrosis, compartment syndrome, limb loss.
• AV fistula: arterial pressure transmitted to venous system → high-output cardiac failure, venous hypertension ^[1].
• Pseudoaneurysm: risk of rupture, embolization.

The lethal triad of trauma (acidosis, hypothermia, coagulopathy) is exacerbated by uncontrolled vascular bleeding ^[6].

Hard Signs of Vascular Injury

Table 14.1. Clinical signs and an evidence-based evaluation pathway for suspected vascular injury ^[7]

Practical evaluation algorithm (stable patient)

1. Identify hard signs → proceed directly to hemorrhage control and definitive management (OR/hybrid suite) without delaying for imaging. ^[7]
2. If soft signs or proximity mechanism → obtain ABI/API.
3. ABI/API < 0.9 or abnormal Doppler/pressure asymmetry → CTA to define injury and plan repair. ^{[7] [8]}
4. Normal ABI/API (≥0.9) and no progressive symptoms → observation with serial neurovascular exams and repeat ABI/API if symptoms evolve. ^[7]

High-risk pitfall

• Knee dislocation has a substantial risk of popliteal artery injury; normal pulses do not exclude injury because of collateral flow or transient reduction. Maintain a low threshold for ABI/API and CTA based on local protocols. ^[9]

Diagnostics

Diagnostic priorities

• Diagnose life-threatening hemorrhage first (hemodynamics, ongoing blood loss), then define arterial/venous injury anatomy for repair planning. ^[1]
• Separate patients into unstable (needs immediate hemorrhage control) vs stable (can undergo imaging). ^[7]

Preferred tests by clinical scenario

Hemodynamically unstable or hard signs

• Proceed directly to operative/hybrid management; imaging should not delay hemorrhage control. ^[7]

Hemodynamically stable with suspected extremity vascular injury (no hard signs)

• ABI/API is the recommended screening test.

• ABI/API < 0.9 → obtain CTA. ^{[7] [8]}
• ABI/API ≥ 0.9 with reassuring exam → observe with serial exams (repeat ABI/API if symptoms change). ^[7]
• See 10PAD for ABI measurement technique and interpretation. ^[8]

Imaging modalities

• CT angiography (CTA): first-line anatomic test in stable patients; rapid, widely available, and sufficient for most operative or endovascular planning. ^[7]
• Duplex ultrasound (DUS): useful for targeted extremity evaluation and follow-up; limited for deep torso/junctional vessels and in extensive soft tissue injury. ^[1]
• Digital subtraction angiography (DSA): diagnostic and therapeutic; preferred when an endovascular intervention is likely (embolization, stent-graft, balloon occlusion) or when CTA is equivocal and the patient can be managed in a hybrid/IR environment. ^[10]

• See 3Chapter 3 for angiography fundamentals. ^[10]

Principles of Damage Control Vascular Surgery

Core concept

Damage control vascular surgery prioritizes rapid hemorrhage control and restoration of critical perfusion, deferring definitive reconstruction until physiology is corrected (hypothermia, acidosis, coagulopathy). ^{[6] [1]}

Stepwise damage-control sequence

1. Immediate hemorrhage control (compressible bleeding)

• Direct pressure, wound packing, junctional devices, and tourniquets.
• Early tourniquet application for severe extremity hemorrhage improves survival when used appropriately. ^[11]

1. Immediate hemorrhage control (non-compressible torso hemorrhage)

• Endovascular balloon occlusion (e.g., 16REBOA) as a bridge to definitive hemorrhage control in appropriately selected patients and systems. ^{[4] [12]}
• REBOA practice should follow system-level governance and training standards. ^[13]

1. Temporize perfusion and shorten operative time

• Temporary intravascular shunts (TIVS) to restore limb perfusion when definitive repair is unsafe or delayed (polytrauma, ortho fixation first, transfer). ^[2]
• Clamp/ligate selectively when permissible (e.g., select venous injuries) as a last resort for uncontrolled hemorrhage. ^[1]

1. Staged definitive reconstruction

• Definitive arterial/venous repair after resuscitation endpoints improve (warming, correction of coagulopathy, reduced vasopressor requirement). ^[6]

REBOA: practical safety principles

• Use REBOA as a bridge, not definitive hemorrhage control. ^[12]
• Registry data demonstrate feasibility but also emphasize complication risk and the need for appropriate indications and rapid definitive hemostasis pathways. ^[14]
• Consider partial or intermittent REBOA to reduce distal ischemia burden in selected scenarios when expertise and monitoring are available. ^[15]
• When comparing REBOA with resuscitative thoracotomy, observational data suggest outcome differences are highly dependent on patient selection and timing. ^[16]

Open Surgical Approaches

• Primary repair: small lacerations.
• Vein patch angioplasty: intimal or partial wall defects.
• Interposition graft: reversed saphenous vein graft is gold standard ^[7].
• Bypass grafting: when segment loss is long; prosthetic used if vein unavailable ^[7].
• Ligation: only for uncontrollable hemorrhage in non-critical vessels (e.g., some venous injuries) ^[1].

Endovascular Approaches

Where endovascular therapy adds the most value

Endovascular techniques are particularly useful for junctional and torso vessels where exposure is difficult and time to hemorrhage control is critical, and in patients with severe physiologic derangement where open repair is poorly tolerated. ^{[4] [3]}

Common endovascular options

• Covered stent-grafts

• Typical targets: subclavian/axillary, iliac, select carotid injuries, and thoracic aorta (BTAI). ^{[3] [5]}
• Key requirement: adequate landing zones and ability to maintain antiplatelet therapy when needed.

• Embolization (coils/plugs/particles)

• Commonly used for pelvic and solid-organ hemorrhage control as part of damage control resuscitation. ^[17]
• See 16EVTM for embolization workflows in hybrid trauma systems. ^[4]

• Balloon occlusion (REBOA or selective balloons)

• Bridge to definitive hemorrhage control in non-compressible hemorrhage, within system governance standards. ^{[13] [14]}

Patient selection and practical contraindications

• Avoid delaying hemorrhage control in unstable patients when endovascular capability is not immediately available (conversion to open should be anticipated). ^[1]
• Consider contamination, soft tissue destruction, and infection risk when selecting stent-grafts in penetrating wounds. (If long-term infection risk is high, open reconstruction may be preferred.) ^[18]

Traumatic aortic injury (BTAI): current principles (overview)

• TEVAR is generally preferred for grade II–IV injuries when anatomy is suitable, with anti-impulse therapy as early management. ^{[5] [19]}
• Left subclavian management should be individualized; see 6Thoracic Aortic and guidance on subclavian coverage strategies. ^[20]

Hybrid Approaches

• Combination of laparotomy + endovascular (e.g., pelvic bleeding controlled with embolization + external fixation).
• Increasing use in dedicated hybrid ORs ^[4]. See 16EVTM for hybrid trauma surgery protocols.

Complications

Early complications (hours–days)

• Hemorrhage or re-bleeding (suture line failure, shunt dislodgement). ^[1]
• Thrombosis/embolization of repair or shunt (acute ischemia). ^[1]
• Reperfusion injury, rhabdomyolysis, hyperkalemia, and compartment syndrome after revascularization. ^[1]
• Access complications from endovascular procedures (hematoma, pseudoaneurysm, limb ischemia). ^[1]
• REBOA-specific: distal ischemia and metabolic derangement risk increases with occlusion time; registry data highlight the importance of strict indications and rapid transition to definitive hemorrhage control. ^[14]

Late complications (weeks–years)

• Pseudoaneurysm and arteriovenous fistula. ^[1]
• Graft stenosis/occlusion and chronic limb ischemia. ^[1]
• Graft/endograft infection (particularly concerning after penetrating trauma with contamination or prolonged soft-tissue compromise). ^[18]
• TEVAR-related: endoleak, migration, and reintervention (requires surveillance). ^[19]

Follow-up

Goals of follow-up

• Detect repair failure (stenosis, thrombosis, pseudoaneurysm, endoleak), manage wound/soft tissue recovery, and support functional limb outcomes. ^[1]

Suggested surveillance by repair type

Extremity open repair (primary repair, patch, vein bypass/interposition)

• Clinical exam and noninvasive testing (DUS when feasible) early after repair, then interval follow-up based on injury pattern and reconstruction complexity. ^[1]

Peripheral covered stent-grafts (e.g., subclavian/axillary/iliac)

• Clinical exam plus DUS/CTA as anatomy dictates; ensure surveillance is feasible before choosing a stent-graft strategy. ^[1]

TEVAR for BTAI

• CTA surveillance is required to assess for endoleak and device-related complications, with interval imaging based on institutional protocol and guideline principles. ^{[19] [21]}

Antithrombotic considerations

• Antiplatelet and/or anticoagulation decisions depend on repair type, bleeding risk, and concomitant injuries.
• Stent-grafts commonly require antiplatelet therapy; ensure this is compatible with the patient's intracranial/solid organ injury profile. ^[1]

Quality improvement and outcomes tracking

• Participation in regional/national registries supports benchmarking and continuous improvement for vascular trauma pathways (including endovascular adjunct use and reintervention). ^{[22] [23] [24]}

Guidelines and Evidence

Key guidance documents (high yield)

• Extremity vascular trauma evaluation and management principles (hard signs → immediate management; ABI/API-based screening; CTA/DSA planning) are summarized in EAST guidance and remain foundational. ^[7]
• Pelvic trauma hemorrhage control (including embolization pathways) is addressed in WSES guidance. ^[17]
• REBOA governance and system implementation in civilian trauma systems is outlined in the ACS-COT/NAEMSP joint statement (patient selection, training, QA). ^[13]
• Descending thoracic aorta disease/TEVAR guidance informs BTAI technical decisions and complication mitigation strategies. ^[5]
• ACC/AHA aortic disease guideline provides contemporary standards relevant to TEVAR imaging surveillance and aortic management principles applicable to traumatic aortic injury follow-up. ^[19]

Cross-references

• See 16EVTM for hybrid workflows, balloon occlusion, and endovascular adjunct integration into damage control resuscitation. ^[4]

Blunt thoracic aortic injury (BTAI) management

Injury grading

• Grade I: Intimal tear
• Grade II: Intramural hematoma
• Grade III: Pseudoaneurysm
• Grade IV: Rupture ^[21]

Initial management (all grades)

• Anti-impulse therapy (typically beta-blockade) to reduce aortic wall stress while planning definitive management. ^{[21] [19]}

Definitive management

• TEVAR is generally preferred for grade II–IV BTAI when anatomy is suitable. ^{[5] [19]}
• Grade I injuries are often managed non-operatively with strict hemodynamic control and interval imaging. ^[5]
• In stable patients with major concomitant injuries, delayed repair may be appropriate to optimize physiology and reduce perioperative risk (timing should be individualized). ^{[21] [5]}

Technical considerations

• Sizing/oversizing: avoid excessive oversizing in young, small aortas. ^[5]
• Left subclavian artery coverage: may be required for an adequate proximal seal; selective revascularization is recommended in higher-risk situations (e.g., LIMA graft, dominant left vertebral, dialysis access, upper extremity ischemia risk). ^[20]
• Spinal cord ischemia mitigation: minimize coverage length where feasible and avoid sustained hypotension. ^[5]

Surveillance

• CTA surveillance after TEVAR is recommended to assess endoleak, migration, and device-related complications (typical schedule: early post-op and interval follow-up based on institutional protocol). ^{[19] [21]}

Temporary intravascular shunts (TIVS): indications, technique, and outcomes

Indications for Temporary Shunts

Temporary intravascular shunts (TIVS) are employed to restore limb perfusion rapidly in the damage control setting when immediate definitive repair is not feasible. Key indications include: ^[2]

• Combined injuries: Patients with concomitant orthopedic injuries requiring fracture stabilization before vascular reconstruction
• Physiologic exhaustion: Hypothermic, acidotic, or coagulopathic patients in the lethal triad who cannot tolerate prolonged vascular reconstruction
• Prolonged transfer: Patients requiring inter-facility transfer to definitive vascular care
• Mass casualty scenarios: Triage situations where multiple patients require sequential care

Technical Aspects

• Shunt selection: Use appropriately sized silicone or polytetrafluoroethylene (PTFE) shunts; size should match the vessel diameter to prevent dislodgement or thrombosis. Javid, Pruitt-Inahara, and Argyle shunts are commonly employed ^[2].
• Fixation: Secure shunts with vessel loops, umbilical tapes, or proprietary securing devices. Inadequate fixation risks dislodgement and catastrophic hemorrhage.
• Anticoagulation: Systemic anticoagulation is generally avoided in polytrauma patients due to bleeding risk. Local heparinized saline flush (100 units/mL) is used for shunt priming. Some centers advocate for low-dose systemic heparin (3000–5000 units) if no contraindications exist ^[2].
• Dwell time: Shunts may remain in place for 6–24 hours, with some series reporting successful patency beyond 48 hours ^[2]. Definitive repair should be performed once physiologic derangements are corrected and competing injuries are stabilized.

Outcomes

Data from military conflicts in Iraq and Afghanistan demonstrate limb salvage rates exceeding 90% when temporary shunts are employed appropriately, compared to 50–60% with ligation alone ^[25]. Civilian series confirm these benefits, with shunt patency rates of 85–95% and amputation rates of 5–15% when combined with staged definitive repair ^[2].

Integration with EVTM: TIVS can be combined with endovascular techniques such as REBOA to prioritize proximal hemorrhage control while maintaining distal limb perfusion ^[4]. See 16Ch. 16 for REBOA protocols and hybrid trauma workflows.

Limb salvage decision-making and fasciotomy indications

Timing of Revascularization

Ischemia tolerance of skeletal muscle is approximately 6 hours ^[7], after which irreversible damage occurs. Revascularization should be prioritized within this window whenever feasible. However, prolonged ischemia time alone should not mandate amputation if viable tissue remains.

Assessment of Limb Viability

Clinical examination remains the cornerstone of limb salvage decision-making:

• Motor function: Inability to dorsiflex or plantarflex the foot suggests advanced ischemia but may recover after revascularization if warm ischemia time is limited.
• Sensory examination: Loss of light touch and proprioception indicates nerve ischemia; complete anesthesia for >6 hours portends poor functional recovery.
• Muscle viability: Compartment palpation assessing for firmness, passive stretch pain, and muscle consistency. Woody, non-contractile muscle suggests necrosis.
• Skin perfusion: Mottling, dusky appearance, and capillary refill >3 seconds indicate severe ischemia.

Mangled Extremity Severity Score (MESS)

The MESS and similar scoring systems (Predictive Salvage Index, Limb Salvage Index) were developed to predict amputation necessity. However, these tools have limited positive predictive value and should NOT be used as sole criteria for amputation decisions ^[1]. Clinical judgment, incorporating all injury patterns, physiologic status, and patient factors, must guide limb salvage attempts.

Fasciotomy Indications

Prophylactic four-compartment fasciotomy should be performed liberally in the following scenarios: ^[7]

• Ischemia time exceeding 4–6 hours
• Combined arterial and venous injuries
• Crush injuries or significant soft tissue trauma
• Massive resuscitation (>6 units packed red blood cells)
• Elevated compartment pressures (>30 mmHg or within 30 mmHg of diastolic blood pressure)

Fasciotomy should be performed at the time of vascular reconstruction or immediately thereafter. Delayed fasciotomy after reperfusion injury develops has limited efficacy and increases morbidity.

Contemporary Evidence

Military experience from Operation Iraqi Freedom and Operation Enduring Freedom demonstrated that aggressive limb salvage attempts, incorporating temporary shunts, staged reconstruction, and liberal fasciotomy, achieved functional limb preservation in 85–90% of cases previously considered unsalvageable ^[25]. Civilian trauma centers adopting these damage control principles report similar outcomes ^[2].