Abdominal Trauma

Blunt abdominal trauma is more challenging than penetrating trauma, where the decision to operate is usually straightforward. All abdominal trauma is managed one of three ways:

• Operative
• Non-operative management (NOM) with IR
• NOM without IR.

Pitfalls!

• Suspect rather than rely on numbers - Abdominal haemorrhage is often concealed, is always non-compressible and recognition is challenging.
• The surgical hand will only detect 50% of abdominal injuries, even in conscious patients.
• Beware in elderly, obese, obtunded, and spinal cord injured patients.
• This starts at the nipples anteriorly and scapular angle posteriorly, though trauma rarely respects these boundaries.
• Do not remove the pelvic binder to perform a laparotomy.
• Patients with a sustained SBP <70mmHg and abdominal trauma should be in theatre.
• Ureteric injuries are rare but commonly missed.

Surgery

• A midline laparotomy should be used over other approaches
• Haemorrhage control should occur as quickly as possible within 1 hr of presentation.
• A surgical consultant should be present for all trauma laparotomies.
• The following are the commonest indications for an immediate laparotomy:
  
  • Unstable patient with positive FAST
  • Peritonitis
  • Unstable patient with free fluid on CT
  • Hollow viscus injury
  • Retained weapon
  • Gunshot wound
  • Evisceration.
• A laparotomy should be strongly considered when free fluid is present in the absence of solid visceral injury.

Damage Control

• Utilise damage control principles (Proximal Control, Haemostasis and Faecal/Urinary diversion) over definitive procedures in selected patients with physiological compromise.
• Consider temporary abdominal closure in the presence of physiological compromise.
• The second look should follow between 24-72 hours after the first operation.

CT

CT is the gold standard imaging modality of choice in blunt abdominal trauma.

FAST

• A FAST should can be useful in the following situations:
  • Unstable patients.
  • Multiple casualties where triage can be challenging.
• FAST can rule in intra-abdominal haemorrhage.
• A negative FAST does not rule out injury.

Ultrasound

Ultrasound should not be used acutely to assess intra-abdominal injury in adults. CT is the modality of choice.

Imaging

• Perform CT in all penetrating trauma where Non-operative Management (NOM) is being considered.
• NOM should be considered if there is all three of:
  • Haemodynamic stability
  • Absence of peritonitis
  • Absence of diffuse abdominal tenderness (away from wound).

Laparoscopy

• Consider in left sided thoracoabdominal injuries to rule out diaphragmatic injury.
• Can be used to determine peritoneal penetration.

Antibiotics

• Administer a single pre-op dose of antibiotics as per local guidelines for all patients undergoing a laparotomy for penetrating trauma.
• If there is no hollow viscus injury, then no further antibiotics are required.
• If there is hollow viscus injury, then continue antibiotics for 24 hours.
• Consider repeat dosing of antibiotics during massive transfusion.

Penetrating Colon injuries

Resect penetrating colonic injuries and strongly consider leaving definitive repair or stoma formation until re-look laparotomy in damage control setting.

Penetrating Rectal Injuries

• Perform proximal diversion in patients with suspected non-destructive penetrating extra-peritoneal rectal injuries
• Do not use pre-sacral drains or perform distal rectal washout.

Discharge of penetrating injuries

Discharge after 24 hours in the presence of reliable clinical examination and minimal to no abdominal tenderness

Operative Management – Splenectomy

Indications:

• Separate indication for laparotomy.
• Unresponsive haemodynamic instability.
• Ongoing signs of haemorrhage after IR.

Non-operative Management (NOM)

Indications:

Any grade of injury even with free fluid and pseudoaneurysm.

Only consider in patients with severe Traumatic Brain Injury when there is immediate access to IR and surgery.

Risk Factors for failure of NOM:

• Age >55yrs
• Grade III, IV & V injuries
• High Injury Severity Score
• Large Haemoperitoneum
• Hypotension before resuscitation
• GCS<12
• Low haematocrit on admission
• Blush on CT
• Anticoagulated
• HIV
• Drug addiction
• Cirrhosis
• Blood Transfusion required.

Interventional Radiology

Considerations:

• IR should be considered where there is active arterial extravasation, regardless or injury grade and no other indication for laparotomy.
• Stabilisation is an important consideration regarding transfer of the patient but can occur simultaneously with transfer/IR treatment.

Admission and Ongoing Management

• Transfer patients with a grade III/IV/V to the MTC for a minimum of 48-72 hours observation and bed rest.
• Start LMWH 24 hours after injury in most cases, even in patients undergoing NOM.
• Reversal of anticoagulant should be individualised on risk-benefit.
• Consider repeat CT scanning during admission in:
  
  • Grade III-V injuries.
  • Decreasing haematocrit.
  • Presence of blush, pseudoaneurysm or AV fistula on initial scan.
  • Underlying splenic pathology.
  • Coagulopathy.
  • Neurologically impaired patients.

Vaccinations and Antibiotics

In splenectomy patients, commence prophylactic antibiotics immediately and give Pneumococcal, Hib, MenC and influenza vaccines after 14 days or on discharge.

Immune function is thought to be preserved in patients who have undergone embolisation.

Surgical principles

Absolute Indications

• Haemodynamic instability
• Peritonitis
• Penetrating injury with any of:
  
  • Significant free air
  • Localised thickened bowel wall
  • Evisceration
  • Impalement
  • Free fluid without solid visceral injury
  • Other organ injury requiring laparotomy.

Relative Indications

Severe Head or spinal cord injury which impairs clinical assessment.

Non-operative Management (NOM)

Should be attempted in all grades of liver injury not requiring laparotomy.
All Grade III/IV/V injuries and all penetrating liver trauma should be monitored in the MTC with 4-6 hourly bloods and clinical examination for 48hrs in a monitored environment.

Interventional Radiology

Indications (In the absence of another indication for laparotomy)

• Stable patients with active arterial extravasation on CT
• Unstable patients with active arterial extravasation responding to resuscitation
• Hepatic artery pseudo aneurysms
• Post operative repair for liver injury IR can be safely repeated if required.

Complications of Liver Trauma

12-14% complication rate, most commonly in Grade IV/V consisting of:

• Bleeding
• Abdominal compartment syndrome
• Abscesses
• Necrosis
• Biliary complications:
  
  • Leak
  • Haemobilia (raised bilirubin +/- upper GI bleed)
  • Biloma
  • Peritonitis
  • Fistula.

Further Imaging / Interventions

Perform a repeat CT in the presence of

• Abnormal inflammatory response
• Abdominal pain
• Fever
• jaundice
• Drop in Hb.

Biliary complications may require ERCP, stenting, drainage, or surgery.

History & Examination

• Pre-existing renal pathology/surgery makes injury more likely
• The following examination findings may suggest renal injury:
  
  • Flank pain
  • Flank abrasions
  • Fractured lower ribs
  • Abdominal tenderness/distension/mass.

Investigations

Perform a Urinalysis and Creatinine in all patients.

Imaging

USS

USS is not useful in the acute setting.

IVP

• IVP should only be used if CT is unavailable.
• Perform a one shot IVP in theatre for patients who were taken directly to theatre without imaging (2ml/kg of contrast followed by plain film after 10 mins.)

CT

• CT triple phase arterial, venous and urographic is the imaging modality of choice and indicated in the presence of:
  • Frank haematuria
  • Microscopic haematuria with a single episode of haematuria
  • All penetrating Trauma.
• Consider in the following, even in the absence of haematuria; Rapid deceleration injury
  
  • Direct flank trauma
  • Flank contusions
  • Lower rib/Thoracolumbar fractures.

Concerns regarding contrast worsening outcomes are unwarranted as low rates of contrast induced nephropathy are seen in renal trauma patients.

Non-operative management (NOM)

• All injuries can be attempted to undergo NOM.
• Pedicle and vascular avulsion injuries often require surgery +/- IR
• Transfer all patients with Grade III/IV/V injuries to the MTC for serial 6 hourly clinical and laboratory observation for 24 hrs in a monitored environment.

Interventional radiology

• All injuries can be attempted to undergo NOM.
• Pedicle and vascular avulsion injuries often require surgery +/- IR.

Transfer all patients with Grade III/IV/V injuries to the MTC for serial 6 hourly clinical and laboratory observation for 24 hrs in a monitored environment.

Indications

• Active extravasation of contrast at whole body CT / CT angiography.
• AV fistula
• Pseudoaneurysm
• Some blunt grade III.
• Grade IV/V injuries
• Penetrating injuries

Surgery

Absolute Indications

• Haemodynamic instability
• Expanding or pulsatile haematoma seen at laparotomy.

Relative indications

• Patients who have an abnormal one shot IVP during laparotomy
• Grade V blunt vascular injuries involving renal pedicle or avulsion*
• Grade IV or V penetrating injury*

*Senior Consultant input with Urology/IR if NOM is to be considered.

Nephrectomy is the procedure of choice in damage control / major haemorrhage.

Only attempt renal reconstruction if haemorrhage controlled and there is sufficient viable renal parenchyma.

Antibiotics

Indicated in the following:

• Devitalised tissue
• Significant soft tissue loss
• Immunosuppression
• Grade IV/V injuries
• Fever with no other obvious cause

48-72 hours of IV followed by 5 days of oral antibiotics.

Repeat imaging

• All grade V injuries after 72 hours
• At 48-72hrs if urinary extravasation seen on initial scan to determine need for diversion procedure
• Fever with no other explanation
• Decreasing haematocrit
• Significant flank pain.

Ongoing management / follow-up

• Bed rest until haematuria is light and bladder irrigation not required
• Follow up after 3 months, monitoring blood pressure, creatinine and urinalysis.

Investigations / Imaging

• CT scan is the diagnostic modality of choice
• Raised amylase is suggestive of but not diagnostic of pancreatic injury.

Principles

• Transfer all pancreatic injuries to the MTC
• Strategies include:
  • Operative
  • NOM
  • Drainage
  • Suture repair
  • Resection for major injuries
  • Endoscopic stenting
•  In damage control situations perform drainage only.

Management

Grade I/II injuries (no ductal involvement seen on CT)

• 1st Line is NOM
• Evaluate further with MRCP/ERCP as this may change the grade/management
• If diagnosed at laparotomy use non-resection management:
  
  • pancreatography, drainage or no drainage.

Grade III/IV (any ductal involvement)

• Operative management has fewer complications than NOM and is recommended.
• If diagnosed at laparotomy undertake resection (drainage if damage control)

Octreotide is not recommended as postoperative prophylaxis to prevent fistula.

Pancreatic Trauma Algorithm

Background

Gunshot wounds and RTCs are the commonest mechanism of injuries

Diagnosis

• The diagnosis is often delayed
• Haematuria is an unreliable finding
• Suspect if extravasation of contrast on CT
• Should be considered and looked for during laparotomy for other injuries

Further Imaging

The following features on CT warrant discussion with a urologist and consideration of retrograde/antegrade urography:

• Hydronephrosis
• Ascites
• Urinoma
• Mild ureteral dilation.

Management

Acutely

• Perform immediate repair in stable patients with acute injuries
• In damage control ligate the ureter and divert urine (usually by nephrostomy).

Delayed Diagnosis

Nephrostomy +/- Stent (Retrograde stenting is usually unsuccessful)