Breathing assessment and management

Breathing Assessment - The Primary Survey 'B'

• Assess (IAPP Method):
  • Inspect: Symmetrical chest rise, respiratory rate, cyanosis, penetrating wounds.
  • Auscultate: Equal, bilateral breath sounds.
  • Palpate: Tracheal deviation, subcutaneous emphysema, fractures.
  • Percuss: Hyper-resonance (pneumothorax) or dullness (hemothorax).
• Manage Life-Threatening Injuries Immediately:
  • Tension Pneumothorax: Needle decompression.
  • Open Pneumothorax: Three-sided occlusive dressing.
  • Massive Hemothorax: Chest tube (>1500 mL blood).
  • Flail Chest: Positive pressure ventilation.

⭐ A tension pneumothorax is a clinical diagnosis; do not delay treatment for a chest X-ray. Immediate needle decompression is life-saving.

Life-Threatening Injuries - Thoracic Trauma's Hit List

• Tension Pneumothorax: Air leak acts as a one-way valve.
  • Signs: Hypotension, JVD, absent breath sounds, tracheal deviation (late sign).
  • Tx: Immediate needle decompression (2nd ICS MCL or 5th ICS AAL) followed by chest tube.
• Open Pneumothorax (Sucking Chest Wound): Defect >2/3 tracheal diameter.
  • Signs: Sucking sound, bubbling wound, impaired ventilation.
  • Tx: Three-sided occlusive dressing, then chest tube.
• Massive Hemothorax: >1500 mL blood or >200 mL/hr output.
  • Signs: Shock, ↓ breath sounds, dullness to percussion.
  • Tx: Volume resuscitation, large-bore chest tube (36-40 Fr), possible thoracotomy.
• Flail Chest: ≥2 ribs fractured in ≥2 places.
  • Signs: Paradoxical chest wall motion. Underlying pulmonary contusion is the major problem.
  • Tx: O2, aggressive pain control (e.g., epidural), positive pressure ventilation if needed.
• Cardiac Tamponade: Blood in the pericardial sac compresses the heart.
  • Signs: Beck's Triad (Hypotension, JVD, muffled heart sounds).
  • Tx: Pericardiocentesis, surgical repair.

⭐ In tension pneumothorax, hypotension is due to superior vena cava (SVC) obstruction, leading to drastically reduced preload-a form of obstructive shock.

Definitive Management - Tubes, Drains & Vents

• Chest Tube Thoracostomy:

  • Indications: Pneumothorax, hemothorax, empyema.
  • Site: 4th or 5th intercostal space, anterior to mid-axillary line.
  • Tube Size: Large bore (28-32 Fr) for hemothorax to prevent clogging.
  • ⚠️ Warning: Surgical thoracotomy indicated if initial output >1500 mL or persistent bleeding >200 mL/hr for 2-4 hours.

• Mechanical Ventilation:

  • Indications: Apnea, GCS ≤ 8, impending airway compromise, refractory hypoxemia, severe flail chest.
  • Strategy: Lung-protective ventilation (6-8 mL/kg ideal body weight).

⭐ High-Yield: A persistent large air leak after chest tube insertion is highly suggestive of a tracheobronchial tree injury, a surgical emergency.

High‑Yield Points - ⚡ Biggest Takeaways

• Tension pneumothorax is a clinical diagnosis; treat immediately with needle decompression followed by a chest tube.
• An open pneumothorax (sucking chest wound) requires a three-sided occlusive dressing to function as a one-way valve.
• Massive hemothorax (>1500 mL initial output) is an indication for immediate operative thoracotomy.
• Flail chest from multiple rib fractures causes paradoxical chest wall motion and often requires positive pressure ventilation.
• The primary goal is ensuring adequate oxygenation and ventilation.