A 28-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, airway patent, breathing at 24/min with clear bilateral breath sounds, heart rate 110/min, blood pressure 128/82 mmHg. Abdomen is soft but tender in the left upper quadrant with guarding. Pelvis is stable. During secondary survey, you note a 3 cm laceration over the left 10th intercostal space with minimal bleeding. What is the most appropriate next step in the management of this patient?

Explanation

## Assessment of Penetrating Thoracoabdominal Trauma **Key Point:** In a stable patient with a penetrating wound in the thoracoabdominal zone (between the 4th intercostal space and the anterior superior iliac spine), the priority is rapid assessment for intra-abdominal and intrathoracic injury using imaging and clinical examination, not empiric operative intervention. ### Primary Survey Findings - Hemodynamically stable (BP 128/82, HR 110 is compensatory tachycardia, not shock) - Airway patent, breathing adequate (RR 24 is elevated but oxygenation intact) - No signs of tension pneumothorax or massive hemothorax ### Secondary Survey Interpretation - Left upper quadrant tenderness with guarding suggests potential splenic injury - Intercostal laceration at 10th space places the wound in the thoracoabdominal zone - Minimal external bleeding does NOT exclude significant intra-abdominal hemorrhage ### Management Algorithm ```mermaid flowchart TD A[Penetrating thoracoabdominal wound]:::outcome --> B{Hemodynamically stable?}:::decision B -->|Yes| C[FAST + CT imaging]:::action B -->|No| D[Exploratory laparotomy]:::action C --> E{Free fluid/solid organ injury?}:::decision E -->|Yes, bleeding| F[Operative intervention]:::action E -->|No, peritoneal signs| G[Serial abdominal exams, observe]:::action E -->|No peritoneal signs| H[Discharge with follow-up]:::action ``` **High-Yield:** Stable patients with penetrating thoracoabdominal wounds are managed selectively with imaging (FAST + CT) and serial clinical examination. Mandatory exploration is reserved for hemodynamic instability or peritoneal signs. **Clinical Pearl:** A single elevated heart rate (110/min) in isolation does NOT mandate surgery; it reflects the body's response to trauma. Hypotension, tachycardia >120 with cool extremities, and peritoneal signs are the red flags for operative intervention. ### Why FAST? - Rapid bedside assessment for free intra-abdominal fluid (blood) - Can be repeated serially - Guides decision between observation and imaging [cite:ATLS 10th Edition, Chapter 5: Initial Assessment and Management]