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Difficulty: MediumTrauma and Burns

Paramedics arrive at the trauma bay with a 2424-year-old construction worker who sustained a stab wound to the left lower chest during an altercation at a job site. The injury occurred approximately 3030 minutes ago. On presentation, blood pressure is 82/45 mm Hg82/45 \text{ mm Hg} and heart rate is 134/min134 \text{/min}. Pulse oximetry shows 96%96\% on supplemental oxygen. Primary survey reveals a 3-cm3\text{-cm} linear laceration in the left 6th6^{\text{th}} intercostal space at the midclavicular line. The airway is patent. Breath sounds are clear and symmetric bilaterally, and heart sounds are normal without muffling. Examination of the abdomen reveals diffuse rigidity, guarding, and severe tenderness to palpation in all four quadrants. Which of the following is the most appropriate next step in the management of this patient?

  1. A
    Cross-sectional imaging of the abdomen and pelvis with intravenous contrast
  2. Exploratory laparotomyAnswer
  3. C
    Serial abdominal examinations and intravenous fluid resuscitation
  4. D
    Placement of a tube thoracostomy on the left side
  5. E
    Administration of broad-spectrum intravenous antibiotics and close observation

Answer

Exploratory laparotomy
The correct intervention is an exploratory laparotomy. This patient has sustained a penetrating injury to the left lower chest. Because the diaphragm can elevate as high as the 4th intercostal space during full expiration, any wound below this level must be considered a potential intra-abdominal injury. The patient presents with overt hemodynamic instability (tachycardia and severe hypotension) alongside frank peritonitis (diffuse rigidity and guarding). According to Advanced Trauma Life Support (ATLS) guidelines, the combination of penetrating abdominal/thoracoabdominal trauma, shock, and peritonitis is an absolute indication for immediate operative intervention. Prompt laparotomy is required to arrest hemorrhage and control hollow viscus contamination.

Step-by-Step Solution

1
Identify the anatomic zone of injury.
The stab wound is in the left 6th6^{\text{th}} intercostal space, which falls into the thoracoabdominal region (typically defined as inferior to the 4th4^{\text{th}} intercostal space anteriorly).
Because the diaphragm can rise as high as the 4th4^{\text{th}} intercostal space during expiration, any penetrating wound below the nipples must be assumed to involve intra-abdominal organs.
2
Assess the patient's hemodynamic status and physical examination findings.
The patient is in hypovolemic shock (blood pressure 82/45 mm Hg82/45 \text{ mm Hg}, heart rate 134/min134 \text{/min}) and exhibits clear signs of peritonitis (diffuse rigidity and guarding).
Hemodynamic instability and peritonitis are critical branch points in trauma algorithms that dictate whether a patient goes to imaging or directly to the operating room.
3
Determine the definitive management plan based on the findings.
The combination of penetrating trauma, hemodynamic instability, and peritonitis requires immediate exploratory laparotomy.
Surgical exploration is required to rapidly identify and control intra-abdominal bleeding and hollow viscus spillage; delaying for imaging in this state is fatal.

Key Concept

Hemodynamically unstable patients with penetrating thoracoabdominal trauma and signs of peritonitis require immediate exploratory laparotomy without delay for further imaging.
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Topics

Trauma and Burns

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