Pneumothorax and Flail Chest Management

Physiological Differences and Pathophysiology

Air accumulates in the pleural space, disrupting the negative pressure required for normal lung expansion and causing progressive lung collapse, with a spontaneous reabsorption rate of only 1.25-1.8% of hemithorax volume per 24 hours without intervention 1
Tension pneumothorax represents a life-threatening variant where progressive air accumulation increases intrathoracic pressure, compressing the heart and great vessels, reducing cardiac output, and causing cardiovascular collapse within minutes if untreated 2
Flail chest occurs when 3 or more consecutive ribs are fractured in 2 or more places, creating an unstable chest wall segment that moves paradoxically inward during inspiration, resulting in severe pulmonary restriction, rapid breathing, respiratory distress, and potential shock development 3

Simple pneumothorax is characterized by decreased or absent breath sounds on the affected side, chest pain, dyspnea, and respiratory distress, with a respiration rate >25 and oxygen saturation <90% 5, 2
Tension pneumothorax is a medical emergency with symptoms including progressive dyspnea, tracheal deviation away from the affected side, jugular venous distension, subcutaneous emphysema, elevated chest wall on the affected side, hypotension, tachypnea, pallor, and cold extremities 2
Point-of-care ultrasound should be considered for pneumothorax detection in the prehospital setting, with 92% sensitivity and 99.4% specificity 2

For simple pneumothorax, observation with high-flow oxygen (10 L/min) during transport is recommended for small pneumothorax (<2 cm) with minimal symptoms, which increases the reabsorption rate four-fold 1
Simple aspiration is recommended as first-line treatment for primary pneumothorax requiring intervention 1
Immediate needle thoracostomy is required for tension pneumothorax, using a No. 14 gauge needle (minimum 8.25 cm length) to convert tension to simple pneumothorax, followed by tube thoracostomy for definitive drainage 2
For flail chest, control paradoxical chest wall movement immediately using multi-head chest strap or towel clip traction for stabilization, and maintain airway patency and provide adequate oxygen supply to prevent respiratory failure 6, 3, 4
Aggressive pain control is paramount, using multimodal analgesia with intravenous or oral acetaminophen as first-line, and consider low-dose ketamine as an opioid alternative 4

Using needles shorter than 7-8 cm for needle thoracostomy, as these frequently fail to reach the pleural space in adults 2
Delaying decompression of tension pneumothorax for imaging or other interventions 2
Mandatory mechanical ventilation for chest wall fixation alone, as this outdated approach increases complications; reserve ventilation only for respiratory failure 6
Inadequate pain control, which leads to splinting, atelectasis, and pneumonia, particularly problematic in elderly patients with reduced physiological reserve 4

Elderly patients (>60 years) have higher mortality rates and require more aggressive management due to reduced physiological reserve, with monitoring for pneumonia, respiratory failure, and chronic pain complications 4
The American College of Surgeons recommends surgical stabilization of rib fractures (SSRF) as the primary treatment approach for flail chest patients, providing better long-term pulmonary function, reduced chest wall deformity, and cost-effectiveness despite surgical expense 3