A 28-year-old man is brought to the trauma center with a gunshot wound to the abdomen. On arrival, he is hypotensive (BP 90/60 mmHg), tachycardic (HR 130/min), with a single entry wound in the right lower quadrant and no exit wound. Focused assessment with sonography for trauma (FAST) shows free fluid in the pelvis. What is the most appropriate next step in management?

Explanation

## Management of Unstable Gunshot Wound to Abdomen ### Clinical Presentation Analysis **Key Point:** This patient demonstrates the classic triad of hemodynamic instability in penetrating abdominal trauma: - Hypotension (90/60 mmHg) - Tachycardia (130/min) - Positive FAST (free fluid in pelvis) These findings indicate **active intra-abdominal hemorrhage** requiring immediate surgical intervention. ### Why Immediate Exploratory Laparotomy is Correct **High-Yield:** In a hemodynamically unstable patient with penetrating abdominal trauma and positive FAST, the standard of care is **immediate surgical exploration without delay for additional imaging**. **Clinical Pearl:** The presence of free fluid on FAST in the setting of hemodynamic instability is pathognomonic for intra-abdominal bleeding until proven otherwise. Further imaging delays definitive hemorrhage control and increases mortality. **Mnemonic: UNSTABLE = OPERATE** - **U**nstable vitals (SBP <90, HR >120) - **N**eed immediate hemorrhage control - **S**urgical exploration is diagnostic and therapeutic - **T**ime is myocardium (every minute of delay increases mortality) - **A**void imaging delays - **B**lood products should be transfused en route - **L**aparotomy is the definitive next step - **E**xplore all four quadrants ### Management Decision Tree ```mermaid flowchart TD A[Penetrating abdominal trauma]:::outcome --> B{Hemodynamically stable?}:::decision B -->|No| C{FAST positive or peritoneal signs?}:::decision B -->|Yes| D[CT abdomen/pelvis with contrast]:::action C -->|Yes| E[Immediate exploratory laparotomy]:::urgent C -->|No| F[Serial exam + selective imaging]:::action E --> G[Hemorrhage control + organ assessment]:::action ``` ### Why Each Alternative is Wrong in This Context **Diagnostic Peritoneal Lavage (DPL):** - Invasive and time-consuming - FAST has replaced DPL as the rapid bedside test - In an unstable patient, DPL delays definitive care - Sensitivity is lower than FAST for free fluid detection **CT Imaging:** - Requires patient transport out of resuscitation area - Takes 15–30 minutes to acquire and interpret - Contraindicated in hemodynamically unstable patients - Patient may decompensate during imaging - Diagnosis (intra-abdominal bleeding) is already established by FAST + clinical instability **Doppler Ultrasound:** - Does not address the immediate hemorrhage - Vascular assessment is a secondary concern when the patient is bleeding - Delays hemorrhage control ### Resuscitation Principles During Transport to OR **Key Point:** While the patient is being prepared for surgery: - Two large-bore IVs (14–16 gauge) - Type O negative blood if available; type-specific once available - Avoid aggressive fluid resuscitation (permissive hypotension: SBP 90–100 mmHg) - Notify surgical team immediately - Prepare for massive transfusion protocol