5.1 Hepatic & Splenic Trauma Grading & Non-Operative Management

Hepatic & Splenic Trauma Grading & Non-Operative Management

Clinical Core: Solid organ injuries to the liver and spleen represent the leading cause of intra-abdominal hemorrhage following blunt abdominal trauma. Hemodynamic stability is the absolute prerequisite for Non-Operative Management (NOM). Serial abdominal exams, trended laboratory parameters, and early recognition of vascular complications are critical nursing priorities.

The liver and spleen are the most frequently injured solid organs in blunt abdominal trauma due to their anatomic locations, high vascularity, and friable parenchymal structure. The liver occupies the right upper quadrant (RUQ) and is protected by the lower rib cage, making it susceptible to deceleration injuries, direct blunt forces, and lower rib fractures (ribs 8–12). The spleen, located in the left upper quadrant (LUQ), is the most commonly injured solid organ in blunt trauma, often compromised by left lower rib fractures (ribs 9–11), seatbelt compression, or direct blows.

---

Organ Injury Grading: AAST Classification

The American Association for the Surgery of Trauma (AAST) Organ Injury Scale provides a standardized anatomical grading system (Grades I through V/VI) based on computed tomography (CT) imaging or intraoperative findings. Understanding these grades allows the trauma nurse to anticipate clinical trajectory, transfusion requirements, and intervention urgency.

---

Non-Operative Management (NOM) Selection & Protocol

Over the past three decades, the management of blunt hepatic and splenic injuries has shifted dramatically from routine exploratory laparotomy to Non-Operative Management (NOM). Today, over 80% to 90% of blunt solid organ injuries are managed non-operatively.

Prerequisites for NOM Selection

NOM is appropriate ONLY when all of the following criteria are satisfied:

1. Hemodynamic Stability: Normal blood pressure and heart rate, or rapid stabilization following a modest crystalloid fluid bolus (<1 L).
2. Absence of Peritoneal Signs: No involuntary guarding, rigidity, or severe rebound tenderness that would suggest concomitant hollow viscus perforation.
3. Absence of Associated Surgical Indications: No unmanageable extra-abdominal injuries or hollow viscus injuries requiring immediate laparotomy.
4. Institutional Resources: Immediate availability of a trauma surgeon, continuous ICU/stepdown monitoring, operating room availability, and rapid access to blood products.

Nursing Monitoring & Care Protocol

Trauma nurses executing a NOM protocol must adhere to a strict surveillance bundle:

• Serial Abdominal Examinations: Physical assessment performed every 1 to 2 hours during the first 24 hours. The exam must focus on increasing abdominal girth, progressive tenderness, guarding, or distension. To maintain consistency, the same examiner should perform serial checks whenever possible.
• Serial Hemoglobin and Hematocrit (Hgb/Hct): Drawn every 4 to 6 hours for the first 24 to 48 hours. A steady drop in Hgb (>2 g/dL decline) or ongoing red blood cell transfusion requirements signals active occult hemorrhage and NOM failure.
• Hemodynamic & Perfusion Surveillance: Continuous telemetry and arterial line monitoring. Tachycardia is frequently the earliest sign of ongoing intra-abdominal bleeding, preceding explicit hypotension. Base deficit (> -4 mEq/L) and serum lactate levels must be trended to detect occult hypoperfusion.
• Activity Restrictions: Strict bed rest for 24 to 48 hours. Strenuous physical activity, contact sports, and heavy lifting are prohibited for 6 to 12 weeks post-injury, depending on organ grade, to prevent delayed rupture.

---

Classic Clinical Signs & Angioembolization

Kehr's Sign & Cutaneous Signs

• Kehr's Sign: Referred pain to the top of the left shoulder caused by diaphragmatic irritation from subdiaphragmatic blood collection. It is a classic clinical indicator of splenic rupture or hematoma expansion.
• Cullen's Sign & Grey Turner's Sign: Periumbilical ecchymosis (Cullen's) and flank ecchymosis (Grey Turner's) represent retroperitoneal or intraperitoneal hemorrhage. These signs typically require 24 to 48 hours to manifest visually.

Transcatheter Arterial Embolization (TAE)

Angiography with embolization has revolutionized NOM, increasing success rates to over 95% even in high-grade (Grades III–V) injuries.

• Indications: Presence of a contrast extravasation ("active blush"), pseudoaneurysm, or arteriovenous fistula on initial dynamic contrast CT in a hemodynamically stable patient.
• Post-Procedure Nursing Care: Monitor puncture site (femoral or radial) for hematoma formation, check distal pedal pulses hourly, enforce leg immobilization if femoral access was used, and monitor renal function (BUN/Creatinine) due to IV contrast load.

---

Complications & Post-Splenectomy Infection Prevention

Delayed Rupture & Hepatic Complications

• Delayed Splenic Rupture: Typically occurs within 10 to 14 days post-injury due to subcapsular hematoma expansion or pseudoaneurysm rupture. Patients presenting with sudden LUQ pain, tachycardia, and syncope after discharge must be evaluated immediately.
• Hemobilia: A rare hepatic vascular complication characterized by the classic triad of RUQ biliary colic pain, obstructive jaundice, and upper gastrointestinal bleeding (melena or hematemesis). It results from a fistula between a hepatic artery branch and a bile duct.

Overwhelming Post-Splenectomy Infection (OPSI)

Patients undergoing operative splenectomy lose the filtering function of splenic macrophages and IgM antibody production, placing them at lifelong risk for fulminant bacteremia known as Overwhelming Post-Splenectomy Infection (OPSI). OPSI carries a mortality rate exceeding 50% within 24 to 48 hours of symptom onset.

• Encapsulated Pathogens: Primary causative organisms are Streptococcus pneumoniae, Neisseria meningitidis, and Haemophilus influenzae type b (Hib).
• Immunization Timing: Vaccines against S. pneumoniae (PCV20/PPSV23), N. meningitidis (MenACWY and MenB), and H. influenzae type b must be administered:
  • Unplanned/Emergency Splenectomy: Administer vaccines on Post-Operative Day 14 (or prior to discharge if discharged earlier). Administering vaccines immediately post-op yields suboptimal antibody titers due to trauma-induced immunosuppression.
  • Elective Splenectomy: Administer vaccines 14 days prior to surgery.
• Patient Education: Post-splenectomy patients must carry a medical alert card, seek immediate medical attention for any fever (>38.0°C / 100.4°F), and keep prophylactic oral antibiotics on hand for travel.