A 32-year-old male presents to the emergency department 20 minutes after a high-speed motor vehicle collision. On primary survey, he is alert and oriented, speaking in full sentences. Vital signs: BP 118/76 mmHg, HR 102/min, RR 24/min, SpO₂ 96% on room air. Breath sounds are equal bilaterally. On secondary survey, you note a tender, distended abdomen with bruising over the left flank. There is no obvious external bleeding. Focused Assessment with Sonography for Trauma (FAST) is positive for free fluid in the left upper quadrant. What is the most appropriate next step in management?

Explanation

## Clinical Context This patient has sustained blunt abdominal trauma with hemodynamic stability and imaging evidence of intra-abdominal free fluid (positive FAST). The next step depends on the patient's stability and the need to define the injury. ## Management Algorithm for Blunt Abdominal Trauma ```mermaid flowchart TD A[Blunt abdominal trauma]:::outcome --> B{Hemodynamically stable?}:::decision B -->|No| C[Resuscitate + OR for exploratory laparotomy]:::urgent B -->|Yes| D{FAST positive?}:::decision D -->|No| E[Serial exams, observe]:::action D -->|Yes| F[CT abdomen/pelvis with IV contrast]:::action F --> G{Solid organ injury?}:::decision G -->|Yes, non-operative candidate| H[ICU monitoring, serial exams, transfusion as needed]:::action G -->|Hollow viscus or active bleeding| I[Exploratory laparotomy]:::urgent ``` ## Key Point: **In a hemodynamically stable patient with positive FAST, CT imaging with IV contrast is the gold standard to characterize the injury, identify which organ is injured, and determine if operative intervention is needed.** This allows selective non-operative management of solid organ injuries (spleen, kidney, liver) when appropriate. ## High-Yield: - **Hemodynamic stability** is the key determinant: stable patients → imaging; unstable patients → OR - **FAST** is a rapid screening tool (sensitivity ~90% for free fluid) but does not identify the organ or bleeding source - **CT with contrast** provides anatomic detail, organ-specific grading, and guides operative vs. non-operative decisions - Serial abdominal exams and ICU monitoring are appropriate *after* imaging defines the injury ## Clinical Pearl: Non-operative management of blunt splenic and hepatic injuries is now standard in hemodynamically stable patients, even with high-grade injuries, provided ICU-level monitoring and transfusion capability are available. This patient's vital signs (BP 118/76, HR 102) indicate compensated shock at worst—not yet requiring immediate OR. [cite:ATLS 10th Edition, Chapter 5: Initial Assessment and Management]