WSES 2020 Guidelines for Liver Trauma Management

Classification of Liver Injuries

• The World Society of Emergency Surgery (WSES) classification combines AAST anatomical grade with hemodynamic status to guide treatment:
• Hemodynamic status is considered more decisive than anatomical grade for management decisions. 2

Initial Diagnostic Approach

• Diagnostic strategy is dictated solely by the patient’s hemodynamic condition. 1
• E‑FAST is the rapid first‑line tool to detect intra‑abdominal free fluid in all trauma patients. [1][4]
• Contrast‑enhanced CT is the gold‑standard imaging modality and is mandatory for every hemodynamically stable patient being evaluated for non‑operative management (NOM). [1][3]
• Diagnostic peritoneal lavage (DPL) is reserved for low‑resource settings lacking CT or ultrasound, with an associated complication risk of up to 2 %. 5

Non‑Operative Management (NOM)

• NOM is the preferred treatment for all hemodynamically stable liver injuries (WSES Grades I‑III), irrespective of AAST grade, including severe AAST IV‑V lesions when stability is maintained. [1][3]5

Requirements for NOM in Transient Responders

• Immediate availability of:

Role of Angio‑Embolization

• In adults with an arterial contrast “blush” on CT, angio‑embolization may be employed as a first‑line hemorrhage‑control intervention. [5][3]4
• In pediatric patients, a contrast blush is not an absolute indication for angio‑embolization. [5][3]

Monitoring During NOM

• Continuous serial clinical assessments (physical examination and laboratory testing) are mandatory to promptly identify clinical deterioration. [1][4]

ICU Admission Criteria

• ICU care is indicated for moderate injuries (WSES II/AAST III) and for severe injuries when other criteria apply; minor injuries (WSES I) do not require ICU monitoring. [1][4]

Special Populations

• Concurrent head or spinal cord injury: NOM can be pursued with reliable clinical examination unless hemodynamic instability precludes achieving neuro‑trauma goals and bleeding is suspected. [1][4]
• Low‑resource environments: NOM is acceptable when the patient is hemodynamically stable, serial examinations remain negative, and imaging or laboratory studies do not reveal ongoing bleeding. [1][3]

Operative Management (OM)

• Hemodynamically unstable non‑responders (WSES IV) must receive immediate operative intervention. [1][3]

Surgical Principles

• Primary goals are rapid hemorrhage and bile‑leak control together with immediate damage‑control resuscitation. [1][5]

Specific Surgical Techniques

• Major hepatic resections should be avoided in the initial operation and considered only later for extensive devitalized tissue, performed by experienced surgeons. [1][3]
• Angio‑embolization serves as an adjunct for persistent arterial bleeding after non‑definitive or damage‑control surgery. [1][5]
• Resuscitative endovascular balloon occlusion of the aorta (REBOA) may be employed as a bridge to definitive hemorrhage control in unstable patients. [1][5]

Delayed Surgery Considerations

• Laparoscopy is recommended as the initial approach for delayed operative intervention to reduce invasiveness. [1][5]
• Interval laparoscopic exploration can function as an extension of NOM in a step‑up strategy when intra‑abdominal injury is suspected days after the initial trauma. [1][4]

Management of Complications

• Delayed hemorrhage (non‑critical): First‑line treatment is angiography with possible embolization. [1][5]
• Hepatic artery pseudo‑aneurysm: Managed by angiography/embolization to prevent rupture. [1][5]
• Intra‑hepatic abscess: Treated with percutaneous drainage. [1][5]
• Symptomatic or infected biloma: Managed with percutaneous drainage. [1][5]
• Post‑traumatic biliary complications: Combined percutaneous drainage and endoscopic techniques when percutaneous alone is insufficient. [1][5]
• Delayed post‑traumatic biliary fistula: Initial management includes lavage/drainage and endoscopic stenting in the absence of other indications for laparotomy. [1][5]

Supportive Care & Prophylaxis

• Venous thrombo‑embolism (VTE) prophylaxis: Mechanical methods are safe for all patients without absolute contraindications; low‑molecular‑weight heparin (LMWH) should be initiated promptly in selected NOM patients. [1][5]
• Anticoagulant reversal: Decisions should be individualized based on risk‑benefit assessment. [1][5]
• Early mobilization and early enteral nutrition are recommended for stable patients as soon as feasible. [1][5]

Critical Pitfalls to Avoid

• Relying solely on AAST anatomical grade to decide between operative and non‑operative management is erroneous; hemodynamic status remains the primary determinant, allowing stable high‑grade injuries to be managed non‑operatively and unstable low‑grade injuries to require surgery. 2
• Inadequate serial monitoring during NOM can miss clinical deterioration; vigilant monitoring is essential given a reported NOM failure rate of 3‑7 %. 1

Management of Elevated Liver Enzymes in Trauma Patients

Diagnostic Approach

• Hemodynamic assessment should be the first step in all trauma patients with abnormal liver enzymes, as it determines whether immediate imaging or a more conservative algorithm is appropriate (World Society of Emergency Surgery) 6.
• In hemodynamically stable patients, contrast‑enhanced computed tomography (CT) is the gold‑standard imaging modality for detecting hepatic injury, grading its severity, and identifying active contrast extravasation (blush) (World Society of Emergency Surgery) 6.
• A comprehensive laboratory panel—including ALT, AST, LDH, alkaline phosphatase, bilirubin, and GGT—should be obtained in stable patients to aid pattern recognition (American College of Radiology) 7.

Differentiating Direct Hepatic Injury from Ischemic Hepatitis

• An ALT/LDH ratio < 1.5 strongly suggests ischemic hepatitis (shock liver), whereas a ratio > 1.5 favors direct traumatic injury or other hepatocellular causes (American College of Radiology) 7.

Post‑Trauma Complications

Delayed Hemorrhage

• Delayed intra‑abdominal hemorrhage occurs in 1.7 %–5.9 % of patients managed non‑operatively, with an associated mortality of up to 18 % (World Society of Emergency Surgery) 8.

Hepatic Artery Pseudoaneurysm

• Hepatic artery pseudoaneurysm develops in approximately 1 % of liver trauma cases; it typically presents with hemobilia (melena or hematemesis) and a concurrent drop in hemoglobin several days after the initial injury, requiring urgent angiographic embolization (World Society of Emergency Surgery) 8.

Infectious Complications

• Intra‑hepatic abscesses are reported in 0.6 %–7 % of severe liver injuries, most often after American Association for the Surgery of Trauma (AAST) Grade IV‑V injuries managed non‑operatively; clinical clues include fever, leukocytosis, and persistently elevated or rising transaminases (World Society of Emergency Surgery) 8.

Biliary Complications

• Bilomas, bile leaks, and biliary fistulas occur in 2.8 %–30 % of liver trauma cases, especially when central (Grade IV‑V) lacerations are present; they manifest with jaundice, elevated bilirubin and alkaline phosphatase, and abdominal pain (World Society of Emergency Surgery) 8.

Monitoring and Follow‑Up

• During non‑operative management, serial physical examinations and repeat laboratory testing are essential to detect evolving complications (World Society of Emergency Surgery) 9.
• If liver enzymes rise or the patient clinically deteriorates, a repeat contrast‑enhanced CT should be performed to evaluate for abscess, biloma, or delayed hemorrhage (World Society of Emergency Surgery) 8.

Influence of Pre‑Existing Liver Disease

• Baseline hepatic enzyme abnormalities from chronic liver disease (e.g., fatty liver, viral hepatitis, cirrhosis) can obscure interpretation of trauma‑related enzyme changes and should be considered when applying diagnostic thresholds (American College of Radiology) 7.