A 32-year-old man presents to the emergency department following a high-speed motor vehicle collision with blunt abdominal trauma. FAST examination reveals free fluid in the pelvis and perihepatic space. His vitals are: BP 95/60 mmHg, HR 128/min, RR 24/min, GCS 15. Which of the following is NOT an absolute indication for exploratory laparotomy in this patient?

Explanation

## Indications for Exploratory Laparotomy in Blunt Abdominal Trauma ### Absolute Indications **Key Point:** Exploratory laparotomy is mandatory in blunt abdominal trauma when there is hemodynamic instability (SBP <90 mmHg or MAP <65 mmHg) combined with positive FAST findings, or when there are peritoneal signs (rebound, guarding, rigidity). ### FAST-Positive Findings Requiring Laparotomy | Clinical Scenario | Hemodynamic Status | Management | |---|---|---| | Positive FAST | Unstable (SBP <90) | **Immediate laparotomy** | | Positive FAST | Stable | Observe, CT scan, serial exams | | Evisceration | Any | **Immediate laparotomy** | | Peritoneal signs | Any | **Immediate laparotomy** | **High-Yield:** The presence of free fluid alone on FAST in a hemodynamically stable patient with no peritoneal signs does NOT mandate immediate surgery. These patients can be managed conservatively with serial abdominal examinations and imaging (CT scan) if stable. ### Clinical Decision Algorithm ```mermaid flowchart TD A[Blunt abdominal trauma]:::outcome --> B{Hemodynamically stable?}:::decision B -->|No SBP <90| C{FAST positive?}:::decision C -->|Yes| D[Immediate laparotomy]:::urgent C -->|No| E[Resuscitate + reassess]:::action B -->|Yes| F{Peritoneal signs or evisceration?}:::decision F -->|Yes| G[Immediate laparotomy]:::urgent F -->|No| H{FAST positive?}:::decision H -->|Yes| I[CT abdomen/pelvis + serial exams]:::action H -->|No| J[Observe, serial exams]:::action ``` **Clinical Pearl:** In a stable patient with isolated free fluid on FAST and NO peritoneal signs, conservative management with serial clinical examination and CT imaging is the standard approach. This avoids unnecessary laparotomy and its associated morbidity. **Warning:** Do NOT confuse "positive FAST" with "indication for laparotomy." The FAST exam only detects the presence of free fluid; the decision to operate depends on hemodynamic stability AND clinical peritoneal signs. **Mnemonic — Absolute Indications for Laparotomy in Trauma:** **HELP** - **H**emodynamic instability + positive FAST - **E**visceration - **L**aparoscopic findings of peritoneal violation - **P**eritoneal signs (rebound, guarding, rigidity) [cite:ATLS 10th Edition Ch 5]