Pneumothorax management

🌬️ Core Concept - Air in the Wrong Place

Air in the pleural space between visceral/parietal pleura, causing lung collapse due to loss of negative intrapleural pressure.

• Spontaneous:
  • Primary (PSP): No underlying lung disease. Classic: tall, thin young men from ruptured apical blebs.
  • Secondary (SSP): Complication of lung disease (COPD, CF, Marfan).
• Traumatic:
  • Iatrogenic: From procedures (central line, thoracentesis) or barotrauma (mechanical ventilation).
• Tension: ⚠️ Life-threatening emergency.
  • One-way valve mechanism. Air enters, can't exit → mediastinal shift, ↓ venous return, hemodynamic collapse.

⭐ Tension pneumothorax is a clinical diagnosis (hypotension, JVD, absent breath sounds). Do not delay needle decompression for a chest X-ray.

🩺 Diagnosis - Spotting the Collapse

• Clinical Presentation:

  • Acute onset, sharp pleuritic chest pain & dyspnea.
  • Often in tall, thin young men (spontaneous) or with trauma/lung disease.
  • ⚠️ Tension Pneumothorax: Hypotension, JVD, cyanosis (medical emergency).

• Physical Exam:

  • Unilateral ↓ breath sounds.
  • Hyperresonance to percussion.
  • ↓ Tactile fremitus.
  • Tracheal deviation away from the affected side (tension).

• Imaging:

  • Chest X-ray (CXR):
    • Visceral pleural line with absent lung markings peripherally.
    • Best seen on expiratory film.
  • Ultrasound (POCUS):
    • Absence of lung sliding; "barcode sign" on M-mode.

⭐ Deep Sulcus Sign: On a supine CXR (e.g., trauma patient), a deep, lucent costophrenic angle is a subtle but specific sign of pneumothorax.

💨 Management - Getting the Air Out

Management strategy is dictated by patient stability and pneumothorax size/type. The goal is to remove pleural air and allow lung re-expansion.

• Observation & Oxygen: For small (<3 cm apex-to-cupola), stable, primary spontaneous pneumothorax (PSP).
  • Supplemental O₂ creates a nitrogen pressure gradient, accelerating air resorption by up to 4x.
• Aspiration/Catheter: For large, stable PSP. Less invasive than a large-bore chest tube.
• Chest Tube (Thoracostomy): Definitive treatment for:
  • Tension pneumothorax (always place after needle decompression).
  • Large or symptomatic PSP failing aspiration.
  • Nearly all secondary spontaneous pneumothoraces (SSP) due to poor pulmonary reserve.
  • Recurrent pneumothorax.

⭐ Placement Pearl: For emergent needle decompression, insert a 14-16 gauge needle superior to the 3rd rib in the 2nd intercostal space (ICS), midclavicular line (MCL). For a chest tube, use the "triangle of safety" (4th/5th ICS, anterior/mid-axillary line).

• Recurrence Prevention: Consider pleurodesis (chemical/mechanical) or VATS for recurrent episodes or persistent air leak >5 days.

📉 Complications - When Things Go South

• Tension Pneumothorax: Hemodynamic collapse, tracheal deviation. ⚠️ Emergent needle decompression → chest tube.
• Re-expansion Pulmonary Edema (RPE): Hypoxemia & cough after rapid inflation of a chronic lung collapse.
• Persistent Air Leak: Air bubbling in chest tube >5-7 days. Consider pleurodesis or VATS.
• Hemopneumothorax: Blood + air. Thoracotomy if output >1.5L initially or >200 mL/hr for 2-4 hrs.
• Subcutaneous Emphysema: Crepitus from air in tissues. Usually self-resolves; monitor airway.

⭐ RPE risk is highest with rapid evacuation of a large (>30%) pneumothorax present for >3 days.

⚡ Biggest Takeaways

• Tension pneumothorax is a clinical diagnosis requiring immediate needle decompression (2nd ICS MCL or 5th ICS AAL), followed by chest tube thoracostomy.
• Small, stable primary spontaneous pneumothorax (PSP) (<3 cm) is managed with observation and supplemental O₂.
• Large or symptomatic PSP requires aspiration or a chest tube.
• Secondary spontaneous pneumothorax (SSP) almost always requires a chest tube and admission.
• Recurrence prevention involves pleurodesis or VATS with blebectomy.