A 28-year-old woman is brought to the trauma bay following a fall from a 15-foot scaffold. On primary survey, she is alert and oriented, with a patent airway, respiratory rate of 20/min, and blood pressure of 110/70 mmHg. Breath sounds are equal bilaterally. She complains of severe right-sided chest pain and has visible bruising over the right chest wall. During the secondary survey, you palpate crepitus over the right ribs and hear diminished breath sounds on the right. Percussion is hyperresonant on the right. What is the most likely diagnosis, and what is the immediate management priority?

Explanation

## Clinical Presentation Analysis ### Patient Stability - **Vital signs stable:** BP 110/70, RR 20/min, alert and oriented - **No signs of tension physiology:** No hypotension, no JVD, no tracheal deviation - **Breathing spontaneously** without respiratory distress ### Physical Examination Findings | Finding | Interpretation | |---------|----------------| | **Crepitus over ribs** | Rib fractures present | | **Diminished breath sounds (right)** | Reduced air entry | | **Hyperresonance to percussion (right)** | **Air in pleural space** → pneumothorax | | **Visible chest wall bruising** | Blunt trauma | **Key Point:** The combination of **diminished breath sounds + hyperresonance** is pathognomonic for pneumothorax. Hyperresonance specifically indicates air, not fluid (dullness = haemothorax). ## Differential Diagnosis ```mermaid flowchart TD A[Blunt chest trauma with rib fractures]:::outcome --> B{Vital signs stable?}:::decision B -->|Yes| C{Percussion findings?}:::decision B -->|No| D[Tension pneumothorax - needle decompression]:::urgent C -->|Hyperresonant| E[Simple pneumothorax]:::outcome C -->|Dull| F[Haemothorax]:::outcome E --> G[CXR + observation]:::action F --> H[Tube thoracostomy]:::action ``` ## Why Simple Pneumothorax? **High-Yield:** The **hyperresonant percussion** is the discriminator: - **Hyperresonance** = **air** in pleural space = pneumothorax - **Dullness** = **fluid** in pleural space = haemothorax The patient is haemodynamically stable and breathing adequately, ruling out tension pneumothorax (which presents with hypotension, JVD, tracheal deviation, and respiratory distress). ## Management of Simple Pneumothorax 1. **Obtain CXR** to confirm diagnosis and estimate size 2. **Observation** — most simple pneumothoraces (< 2 cm at hilum) resolve spontaneously 3. **Supplemental oxygen** — increases resorption rate (4× faster with 100% O₂) 4. **Repeat CXR** at 24–48 hours 5. **Tube thoracostomy only if:** - Size > 2 cm - Respiratory compromise - Tension physiology - Failure to resolve **Clinical Pearl:** In a stable, breathing patient with a simple pneumothorax, rushing to tube thoracostomy is over-treatment. Observation with serial imaging is the standard approach. ## Why NOT the Other Options? **Tension pneumothorax** would present with: - Hypotension (SBP < 90) - Severe respiratory distress - JVD, tracheal deviation - This patient is stable — no tension physiology. **Haemothorax** would show: - **Dull percussion** (not hyperresonant) - Fluid level on CXR - Often associated with hypotension if large volume **Flail chest** (3+ rib fractures in 2+ locations): - Would present with **paradoxical chest wall movement** - Hyperresonance is NOT a feature of flail chest alone - Flail chest does not explain the percussion findings