Chest Trauma

Chest trauma accounts for 25-50% of all trauma-related deaths and is a leading cause of preventable mortality in trauma patients. Rapid identification and management of life-threatening thoracic injuries is essential for intensive care physicians.

Epidemiology

Chest trauma represents the second most common cause of death in trauma patients, following only head injury. Approximately 25% of trauma deaths are directly attributable to thoracic injury, with thoracic injury contributing to up to 50% of all trauma mortality when considering associated injuries[1].

Mechanisms of Injury:

• Blunt trauma (85%): Motor vehicle collisions (most common), falls from height, crush injuries, blast injuries
• Penetrating trauma (15%): Stab wounds (most common), gunshot wounds, impalement injuries

Blunt chest trauma is associated with a higher mortality rate than penetrating trauma due to the high likelihood of multi-system injuries and the kinetic energy transfer pattern[2]. Penetrating trauma typically causes more localized injury but carries significant risk depending on trajectory and weapon characteristics.

Initial Assessment and Resuscitation

The primary survey in chest trauma follows the standard ABCDE approach with specific focus on identifying immediately life-threatening thoracic injuries. The "six deadly chest injuries" must be identified and treated during the primary survey:

1. Airway obstruction
2. Tension pneumothorax
3. Open pneumothorax
4. Massive hemothorax
5. Flail chest with pulmonary contusion
6. Cardiac tamponade

Clinical Assessment:

• Inspection: Respiratory rate, work of breathing, chest wall deformities, paradoxical movement, open chest wounds, ecchymoses (seatbelt sign)
• Palpation: Crepitus, tenderness, paradoxical movement, subcutaneous emphysema, tracheal deviation
• Percussion: Hyperresonance (pneumothorax), dullness (hemothorax)
• Auscultation: Bilateral breath sounds, heart sounds (muffled in tamponade)

Diagnostic Investigations:

1. Chest X-ray (CXR): Supine anteroposterior view in trauma bay. Sensitivity for pneumothorax is only 50-70% in supine patients[3]. Limited for posterior hemothorax.

2. Focused Assessment with Sonography for Trauma (FAST) / Extended FAST (eFAST): Rapid bedside ultrasound for detection of:

   • Hemoperitoneum (standard FAST)
   • Pneumothorax (eFAST pleural views)
   • Pericardial effusion (cardiac tamponade)

   eFAST has 86-98% sensitivity and 97-99% specificity for pneumothorax detection compared to CT, significantly superior to supine CXR[4].

3. Computed Tomography (CT): Chest CT with intravenous contrast is the gold standard for detailed assessment of thoracic injuries. Indications include:

   • Abnormal CXR or eFAST findings requiring further characterization
   • High-energy mechanism with clinical suspicion of injury
   • Hemodynamic stability allowing transfer to CT suite
   • Evaluation of aortic injury, diaphragmatic rupture, or occult pneumothorax

Specific Thoracic Injuries

Rib Fractures and Flail Chest

Rib Fractures:

Rib fractures are the most common thoracic injury, occurring in up to 50% of patients with significant blunt chest trauma. Mortality increases with the number of fractured ribs, particularly in elderly patients[5].

Risk Stratification:

• 1-2 rib fractures: Low mortality (below 5%)
• 3-4 rib fractures: Moderate mortality (10-15%)
• 5+ rib fractures: High mortality (20-30%)
• Bilateral rib fractures: Very high mortality (30-50%)

Complications of Rib Fractures:

• Pain leading to atelectasis and pneumonia
• Pneumothorax (5-10% per rib fracture)
• Hemothorax
• Pulmonary contusion (underlying lung injury)
• Flail segment (3+ adjacent ribs fractured in ≥2 places)

Management:

• Analgesia: Multimodal approach including:

  • Paravertebral block or epidural analgesia (superior to IV opioids for elderly patients)[6]
  • Intercostal nerve blocks
  • Patient-controlled analgesia with opioids
  • NSAIDs (caution in renal impairment, bleeding risk)

• Pulmonary hygiene: Incentive spirometry, early mobilization, chest physiotherapy

• Surgical fixation: Indications for rib fixation (osteosynthesis) include[7]:

  • Flail chest with paradoxical movement requiring mechanical ventilation
  • 3+ rib fractures with deformity greater than 2 rib width and pulmonary dysfunction
  • Severe pain refractory to optimal analgesia
  • Progressive chest wall deformity
  • Open rib fractures with thoracotomy required for other injuries

Evidence for Rib Fixation:

The FLAIL trial demonstrated that surgical fixation of flail chest reduced pneumonia (RR 0.43), tracheostomy requirement (RR 0.44), ICU stay (mean reduction 5 days), and mortality (RR 0.48) compared to non-operative management[8]. A systematic review by Marasco et al. found rib fixation reduced ventilator days (mean reduction 5.2 days) and ICU stay (mean reduction 7.1 days) with no increase in complications[7].

Flail Chest:

Flail chest results from fracture of 3 or more adjacent ribs in 2 or more places, creating a free-floating segment that moves paradoxically with respiration. The pathophysiology involves both the unstable chest wall segment and underlying pulmonary contusion.

Pathophysiology:

• Paradoxical movement reduces tidal volume and causes ventilation-perfusion mismatch
• Underlying pulmonary contusion causes intrapulmonary shunting
• Pain limits chest wall expansion and cough
• Hypoxia from combined ventilatory failure and shunting

Management Principles:

• Analgesia: Epidural or paravertebral block is first-line
• Ventilatory support: Non-invasive ventilation (BiPAP) for selected patients, intubation for severe hypoxia, respiratory fatigue, or altered mental status
• Surgical fixation: For patients requiring mechanical ventilation (shortens duration), severe paradoxical movement, or progressive respiratory failure
• Pulmonary hygiene: Aggressive chest physiotherapy, early mobilization

Pulmonary Contusion

Pulmonary contusion is a bruise of the lung parenchyma resulting from direct compression or rapid deceleration. It is the most common potentially lethal chest injury, present in up to 70% of patients with significant blunt thoracic trauma[9].

Pathophysiology:

• Hemorrhage and edema within alveolar spaces and interstitium
• Increased lung stiffness and reduced compliance
• Ventilation-perfusion mismatch with intrapulmonary shunt
• Progressive worsening over first 24-72 hours (peak at 72 hours)

Clinical Features:

• Hypoxia (PaO2/FiO2 ratio below 300)
• Tachypnea and increased work of breathing
• Decreased breath sounds over affected area
• Chest wall bruising or rib fractures

Radiographic Findings:

• CXR: Patchy or diffuse consolidation, often not apparent until 6-24 hours post-injury
• CT: Ground-glass opacities, consolidation, may underestimate severity initially

Management:

• Ventilatory support: Lung-protective ventilation (tidal volume 6 mL/kg PBW, PEEP 5-10 cmH2O)
• Avoid excessive fluids: Conservative fluid strategy to minimize pulmonary edema
• Analgesia: Adequate pain control to enable deep breathing and coughing
• Treat underlying injuries: Rib fractures, pneumothorax, hemothorax
• Monitoring: Serial CXR, ABG, ventilator parameters

Prognosis:

• Resolution typically occurs within 3-7 days in most patients
• 10-20% develop ARDS, particularly with bilateral contusions
• Mortality 10-25% for severe contusions requiring mechanical ventilation[10]

Pneumothorax

Simple Pneumothorax:

A simple pneumothorax involves air in the pleural space without hemodynamic compromise. In trauma patients, this is usually caused by rib fractures penetrating the pleura or alveolar rupture from increased intrathoracic pressure.

Diagnosis:

• Decreased breath sounds on affected side
• Hyperresonance to percussion
• Dyspnea, chest pain
• CXR: Pleural line, lung edge, increased radiolucency (sensitivity 50-70% supine)
• eFAST: Absence of lung sliding, presence of lung point (100% specific)[4]

Management:

• Small pneumothorax (below 15% lung collapse, hemodynamically stable): Observation with supplemental oxygen (accelerates resorption by reducing nitrogen in pleural space)
• Moderate to large pneumothorax (≥15% lung collapse, symptomatic): Chest tube insertion (thoracostomy)
• All pneumothoraces in patients requiring positive pressure ventilation should be treated with chest tube

Tension Pneumothorax:

Tension pneumothorax is a medical emergency caused by progressive accumulation of air in the pleural space with one-way valve effect, leading to mediastinal shift, compression of the vena cava, and cardiovascular collapse.

Clinical Diagnosis:

• Respiratory distress and tachypnea
• Absent breath sounds on affected side
• Tracheal deviation away from affected side (late sign)
• Hypotension and distended neck veins
• Hyperresonance to percussion
• Cardiac arrest may be the initial presentation

Management:

1. Immediate decompression if clinical diagnosis and cardiovascular compromise:

   • Needle thoracostomy: Second intercostal space, midclavicular line using 14-16 gauge cannula (4-5 cm in adults)
   • Alternative: Fifth intercostal space, anterior axillary line (avoids internal mammary artery, more successful in larger patients)[11]

2. Chest tube insertion: After needle decompression, place formal chest tube (20-28 Fr) in fourth or fifth intercostal space, anterior axillary line

Critical Point: Do NOT delay needle decompression for CXR confirmation in hemodynamically unstable patients with clinical suspicion. Tension pneumothorax is a clinical diagnosis requiring immediate intervention[12].

Occult Pneumothorax:

An occult pneumothorax is not visible on initial supine CXR but is detected on CT or eFAST. Management controversy exists between observation and chest tube placement.

Management Approach:

• Observation with close monitoring: Hemodynamically stable patients, small pneumothorax (below 15% on CT), no planned positive pressure ventilation
• Chest tube placement: Hemodynamic instability, progression on repeat imaging, need for positive pressure ventilation or general anesthesia

A systematic review found that observation of occult pneumothorax is safe in selected patients, with 5-15% requiring subsequent chest tube placement, primarily those requiring positive pressure ventilation[13].

Hemothorax

Hemothorax is accumulation of blood in the pleural space, usually from lung parenchymal injury, intercostal vessel injury, or major vessel injury.

Classification:

• Minimal: below 350 mL blood (blunted costophrenic angle)
• Moderate: 350-1500 mL blood
• Massive: greater than 1500 mL blood initial output

Clinical Features:

• Decreased breath sounds
• Dullness to percussion
• Shock in massive hemothorax
• Mediastinal shift in massive hemothorax

Diagnosis:

• CXR: Blunted costophrenic angle, opacification of hemithorax
• eFAST: Detection of pleural fluid (92-96% sensitivity)[4]
• CT chest: Quantification, detection of active contrast extravasation

Initial Management:

1. Chest tube insertion: Large-bore tube (28-36 Fr) to allow evacuation of blood and monitor ongoing bleeding
2. Adequate drainage: If chest tube output greater than 1500 mL initially, prepare for thoracotomy
3. Autologous blood transfusion: Blood from chest tube can be reinfused using cell-saver device if contamination is not a concern

Massive Hemothorax:

Massive hemothorax is defined by initial chest tube output greater than 1500 mL or ongoing output greater than 200 mL/hour for 2-4 hours[14].

Indications for Thoracotomy in Hemothorax:

• Initial chest tube output greater than 1500 mL
• Ongoing bleeding greater than 200 mL/hour for 2-4 hours
• Persistent hemodynamic instability despite chest tube placement
• Incomplete evacuation of hemothorax (retained clot) leading to empyema risk
• Cardiac tamponade with hemothorax

Retained Hemothorax:

• Failure to evacuate greater than 500 mL blood after chest tube placement
• Increased risk of empyema and fibrothorax
• Management options:
  • Additional chest tube placement
  • Video-assisted thoracoscopic surgery (VATS) evacuation (recommended for hemothorax persisting greater than 3 days)[15]
  • Thrombolytic agents (tPA) through chest tube (alternative to VATS in selected patients)

Cardiac Injury and Tamponade

Blunt Cardiac Injury:

Blunt cardiac injury encompasses a spectrum from myocardial contusion to cardiac rupture. Myocardial contusion is the most common form, occurring in up to 20% of patients with significant blunt chest trauma[16].

Diagnosis:

• ECG: Abnormal in 40-80% of patients with myocardial contusion (arrhythmias, ST-T changes, conduction abnormalities)
• Cardiac biomarkers: Troponin elevation (sensitive but non-specific)
• Echocardiography: Wall motion abnormalities, pericardial effusion, reduced ejection fraction

Management:

• Patients with abnormal ECG should be admitted to monitored bed for 24-48 hours
• Patients with normal ECG and troponin can be discharged if no other injuries
• Treat complications: Arrhythmias, cardiac dysfunction, pericardial effusion

Penetrating Cardiac Injury:

Penetrating cardiac injury is highly lethal, with mortality approaching 90% for patients not reaching definitive care and 20-50% for those reaching trauma center[17].

Clinical Features:

• Central penetrating wound (precordial or epigastric)
• Beck's triad (hypotension, muffled heart sounds, distended neck veins) - often incomplete
• Pulsus paradoxus
• Electrical alternans (rare)

Diagnosis:

• eFAST: Pericardial effusion (90-95% sensitivity for tamponade)[4]
• Subxiphoid pericardial window: If eFAST equivocal or patient unstable for CT
• ECG: Electrical alternans, low voltage (non-specific)

Emergency Department Thoracotomy (EDT):

EDT is performed for patients with penetrating thoracic injury who lose vital signs (pulseless, no breathing) during transport or shortly after arrival at the trauma center.

Indications for EDT:

• Penetrating thoracic trauma with loss of vital signs at trauma center or witnessed en route
• Blunt trauma with loss of vital signs at trauma center (controversial, very low survival)[18]
• Pericardial tamponade on eFAST with cardiovascular collapse

Contraindications for EDT:

• Prolonged asystole (greater than 15 minutes) without CPR
• Severe coagulopathy or anticoagulation
• Significant comorbidities limiting meaningful survival
• Blunt trauma with absent signs of life at scene (extremely poor survival)

Outcomes:

• Penetrating cardiac injury with EDT: 8-35% survival, 10-20% neurologically intact
• Blunt trauma with EDT: below 2% survival, rarely neurologically intact[18]

Pericardial Tamponade:

Cardiac tamponade is a medical emergency requiring immediate pericardial drainage. In trauma, this is usually from penetrating injury or, less commonly, blunt cardiac rupture.

Pathophysiology:

• Pericardial fluid accumulation increases pericardial pressure
• Equalization of diastolic pressures across all cardiac chambers
• Reduced ventricular filling and stroke volume
• Compensatory tachycardia initially, followed by cardiovascular collapse

Clinical Diagnosis:

• Beck's triad (often incomplete in trauma)
• Pulsus paradoxus (greater than 10 mmHg decrease in systolic BP during inspiration)
• Elevated jugular venous pressure
• Kussmaul's sign (paradoxical rise in JVP with inspiration)

Diagnostic Approach:

1. eFAST: First-line, immediate bedside assessment
2. CXR: Enlarged cardiac silhouette (low sensitivity in acute setting)
3. CT: If patient stable, confirms pericardial fluid and associated injuries

Treatment:

• Needle pericardiocentesis: For temporary stabilization if patient unstable for operative drainage

  • Subxiphoid approach using 18-gauge needle attached to ECG monitoring
  • Aspirate blood until hemodynamic improvement
  • "Caution: Pericardiocentesis may miss clotted blood or be unsuccessful"

• Surgical drainage: Definitive treatment

  • "Pericardial window (subxiphoid or thoracoscopic): Diagnostic and therapeutic"
  • "Thoracotomy: Required for concurrent cardiac injury or repair"
  • "Sternotomy: For cardiac repair or mediastinal exploration"

Diaphragmatic Rupture

Diaphragmatic rupture occurs in 0.8-5% of patients with blunt trauma and 10-15% of penetrating thoracoabdominal trauma[19]. Left-sided injuries are more common (70-80%) due to relative protection of right hemidiaphragm by the liver.

Mechanisms:

• Blunt: Lateral impact causing sudden increase in intra-abdominal pressure
• Penetrating: Direct trauma (gunshot > stab wounds)

Clinical Features:

• May be asymptomatic initially (up to 50%)
• Dyspnea, respiratory distress
• Absent breath sounds on affected side
• Bowel sounds in chest (rare, late finding)
• Chest tube output with enteric contents (diagnostic)

Diagnosis:

• CXR:

  • Left diaphragm elevation with irregular margin
  • Nasogastric tube above diaphragm (diagnostic if seen)
  • Pleural effusion, mediastinal shift
  • Sensitivity 27-62%[20]

• CT:

  • Collar sign (waist constriction of bowel at diaphragmatic defect)
  • Dependent viscera sign (bowel or liver abutting posterior ribs)
  • Sensitivity 70-100% when using coronal/sagittal reconstructions[21]

• Diagnostic laparoscopy: For equivocal cases or when performing laparotomy for other injuries

Management:

• Surgical repair: All diaphragmatic injuries should be repaired

• Approach:

  • "Left-sided: Laparotomy (primary approach) or thoracotomy (repair of chronic defects)"
  • "Right-sided: Thoracotomy (better exposure) or laparotomy"
  • "Chronic injuries (greater than 2 weeks): Thoracotomy for better exposure and repair of defect"

• Timing:

  • "Acute injuries: Repair during initial laparotomy if identified"
  • "Delayed diagnosis: Elective repair (strangulation risk increases over time)"

• Complications:

  • Recurrence (5-10%)
  • Pulmonary complications (atelectasis, pneumonia)
  • Intra-abdominal organ injury during repair

Open Pneumothorax (Sucking Chest Wound)

Open pneumothorax occurs when a chest wall defect creates a direct communication between the pleural space and the external environment. This results in equalization of intrathoracic pressure with atmospheric pressure, compromising ventilation and causing a sucking wound during inspiration.

Pathophysiology:

• During inspiration, negative intrathoracic pressure draws air through the chest wall defect
• Larger wounds (greater than 2/3 tracheal diameter) cause greater air entrainment
• Progressive lung collapse with mediastinal shift
• Ventilation-perfusion mismatch and hypoxia
• May progress to tension pneumothorax if wound acts as one-way valve

Clinical Features:

• Visible chest wall defect
• Audible sucking sound during inspiration
• Air bubbling from wound
• Respiratory distress
• Hypoxia and hypercapnia
• Hypotension if large defect or associated injuries

Immediate Management:

The initial step is to create an airtight seal, converting the open pneumothorax to a closed pneumothorax, then manage with chest tube.

1. Initial occlusive dressing:

   • Cover wound with sterile non-porous dressing (Vaseline gauze, plastic, occlusive dressing)
   • Tape on three sides only (flutter valve effect) - allows egress during exhalation
   • Do NOT tape on all four sides (creates tension pneumothorax)

2. Chest tube insertion:

   • Insert chest tube away from wound site
   • Standard size (28-32 Fr) for adult patients
   • Place in fourth or fifth intercostal space, anterior axillary line

3. Definitive wound closure:

   • Surgical repair in operating room
   • Debridement of devitalized tissue
   • Primary closure or delayed closure with soft tissue coverage
   • Muscle flaps or tissue expanders for large defects

Special Considerations:

• Battlefield/austere environments: Chest seals (Asherman or commercial chest seals) are preferred
• Associated injuries: Assess for lung laceration, vascular injury, esophageal injury
• Prophylactic antibiotics: For penetrating chest wall wounds (cover skin flora)

Tracheobronchial Injury

Tracheobronchial injuries are rare, occurring in 0.5-1% of patients with blunt trauma and 2-3% of penetrating chest trauma[1]. High mortality (15-30%) due to associated injuries and delayed diagnosis.

Mechanisms:

• Blunt: Rapid deceleration causing trachea to strike against sternum; shearing forces at carina
• Penetrating: Direct injury from stab wounds or projectiles; transmediastinal injuries

Anatomic Locations:

• Trachea: Cervical (80%) vs intrathoracic (20%)
• Bronchi: Right main bronchus (more common due to anatomy) > left main bronchus
• Carina involvement: Poor prognosis

Clinical Features:

• Stridor or upper airway obstruction (tracheal injury)
• Subcutaneous emphysema (rapid progression)
• Hemoptysis
• Pneumothorax with persistent air leak despite chest tube
• Pneumomediastinum
• Cervical emphysema (with cervical tracheal injury)
• Dyspnea and respiratory distress
• Absent breath sounds if bronchial transection

Diagnosis:

• CXR: Pneumothorax, pneumomediastinum, subcutaneous emphysema, "fallen lung sign" (collapsed lung dependent on gravity due to loss of bronchial connection)
• CT: Pneumomediastinum, discontinuity in airway, pneumopericardium
• Bronchoscopy: Gold standard for diagnosis
  • Direct visualization of airway injury
  • Determines extent and location
  • Guides airway management
  • Can stent temporary airway if needed

Management:

Airway Management:

• Secure airway first before attempting to diagnose

• Intubation:

  • Standard orotracheal intubation may fail with transection
  • Consider fiberoptic intubation
  • For distal injuries, may need mainstem intubation of uninjured side
  • Surgical airway (cricothyroidotomy) for cervical tracheal injuries preventing intubation

• Bronchoscopic guidance:

  • Place endotracheal tube distal to injury if possible
  • Or place in uninjured bronchus
  • Seal injury from ventilated side

Surgical Repair:

• Timing: Immediate repair for complete transection or airway compromise; delayed for partial injuries in stable patients
• Approach:
  • "Cervical trachea: Cervical incision, primary repair or tracheostomy"
  • "Intrathoracic trachea: Right thoracotomy, primary repair"
  • "Bronchial injury: Right or left thoracotomy, primary anastomosis"
• Technique:
  • Debridement of damaged edges
  • Primary end-to-end anastomosis with absorbable sutures
  • Tension-free repair critical
  • Pedicled tissue flap (pericardial fat, intercostal muscle) to reinforce repair
  • Postoperative bronchoscopy to confirm patency

Postoperative Care:

• Mechanical ventilation with low inspiratory pressures
• Perioperative antibiotics
• Serial bronchoscopy to assess anastomosis
• Treat associated injuries (esophageal, vascular, cardiac)

Complications:

• Anastomotic stenosis (10-20%)
• Airway dehiscence
• Recurrent stridor
• Aspiration pneumonia
• Ventilator dependence

Traumatic Aortic Injury

Traumatic aortic injury (TAI) occurs in 0.5-1.5% of patients with blunt trauma, most commonly at the aortic isthmus (ligamentum arteriosum) where the relatively mobile aorta transitions to the fixed descending aorta[22]. TAI is highly lethal, with 85% mortality at the scene, 10-15% in-hospital mortality even with treatment[23].

Mechanism:

• Rapid deceleration causing shearing force at aortic isthmus
• Compression between spine and anterior chest structures
• Increased intravascular pressure from compression

Clinical Features:

• Often associated with severe mechanism of injury
• Pseudocoarctation syndrome: Discrepancy in upper vs lower extremity blood pressures (greater than 20 mmHg difference)
• Radio-femoral delay
• Chest wall ecchymoses (seatbelt sign)
• Back pain (rare)

Diagnosis:

• CXR findings (diagnostic delay without CT):

  • Widened mediastinum (greater than 8 cm at level of aortic knob)
  • Deviated trachea or nasogastric tube
  • Obscured aortic knob
  • Apical pleural cap
  • Deviated esophagus
  • Multiple left rib fractures (first and second ribs)
  • Sensitivity 80-90%, specificity 10-30% (poor specificity)[24]

• CT Angiography (CTA):

  • Gold standard for diagnosis
  • Sensitivity 95-100%, specificity 98-100%
  • Classifies injury grade (I-IV based on intimal tear to transection)
  • Identifies associated injuries

• Transesophageal echocardiography (TEE): Alternative in unstable patients or for intraoperative monitoring

Management:

• Blood pressure control: Target systolic BP below 100-120 mmHg, HR below 60 bpm to reduce shear stress on aortic wall

  • "Beta-blockers: Esmolol infusion (start 25-50 mcg/kg/min, titrate)"
  • "Vasodilators: Nicardipine or nitroprusside (after adequate beta-blockade)"

• Endovascular repair (TEVAR):

  • First-line for most patients
  • Lower mortality and paraplegia rates compared to open repair
  • "Contraindications: Inadequate landing zone, severe tortuosity, extensive intramural hematoma"

• Open repair:

  • Required for certain anatomic configurations
  • Distal aortic cross-clamp with left heart bypass or shunt
  • Higher paraplegia risk (5-10%) compared to TEVAR (below 2%)

• Delayed management: For patients with multiple severe injuries (e.g., severe TBI), blood pressure control with delayed TEVAR is acceptable

Esophageal Injury

Esophageal injury is rare, occurring in 0.03-0.06% of all trauma patients, but carries significant morbidity and mortality (15-30%) due to delayed diagnosis[2].

Mechanisms:

• Penetrating (80%): Stab wounds (esophageal protection from spine limited), gunshot wounds (trajectory dependent)
• Blunt (20%): Rapid deceleration, direct blow, crush injury

Anatomical Levels:

• Cervical esophagus: Most accessible for surgical repair
• Thoracic esophagus: Most common injury site; harder to access surgically
• Abdominal esophagus: May present with abdominal findings

Clinical Features:

• Dysphagia and odynophagia
• Hematemesis
• Subcutaneous emphysema (cervical and mediastinal)
• Pneumomediastinum
• Severe chest or back pain
• Sepsis (if delayed diagnosis greater than 24 hours)
• Pleural effusion (if mediastinal contamination spreads to pleura)

Diagnosis:

Initial Evaluation:

• CXR: Pneumomediastinum, widened mediastinum, pneumothorax, pleural effusion
• CT with oral contrast: Gold standard for stable patients
  • Esophageal wall discontinuity
  • Extraluminal contrast extravasation
  • Pneumomediastinum
  • Adjacent hematoma

Endoscopy:

• Flexible esophagogastroduodenoscopy (EGD):

  • Direct visualization of mucosal injury
  • Sensitivity 85-95%, specificity 90-100%
  • May miss partial-thickness injuries

• Rigid esophagoscopy:

  • Better visualization of full-thickness injuries
  • Allows simultaneous endotracheal intubation
  • Used in operating room

Esophagography:

• Water-soluble contrast: Gastrografin
  • Avoids mediastinitis if contrast extravasates
  • Lower sensitivity than CT
  • Useful when CT equivocal

Management:

Immediate Management:

• NPO status (nothing by mouth)
• Broad-spectrum antibiotics: Cover oral and esophageal flora
• Surgical consultation for repair planning

Surgical Repair:

Cervical Esophageal Injury:

• Left cervical incision
• Mobilization of esophagus
• Primary repair in 2 layers (mucosa + muscular)
• Drainage
• Consider drainage site for delayed repair

Thoracic Esophageal Injury:

• Right thoracotomy (left esophagus more accessible via right chest approach)
• Primary repair if:
  • Diagnosed within 24 hours
  • Minimal tissue loss
  • No significant contamination
• Resection and reconstruction if:
  • Delayed diagnosis (greater than 24 hours)
  • Extensive tissue loss
  • Significant contamination/mediastinitis
  • "Options: Gastric pull-up, colon interposition, jejunal interposition"

Postoperative Care:

• NPO with contrast esophagram before oral intake (typically 7-10 days postoperative)
• Nutritional support: TPN, nasogastric feeding tube distal to repair
• Broad-spectrum antibiotics: 7-14 days (or longer if infection)
• Drainage: Chest tube if pleural involvement
• Serial imaging: Assess for anastomotic leak

Complications:

• Anastomotic leak (10-20%): Most common serious complication
• Mediastinitis: Life-threatening, requires drainage and antibiotics
• Esophageal stricture: Late complication
• Vocal cord paralysis (recurrent laryngeal nerve injury)
• Empyema: If pleural contamination
• Fistula formation: Tracheoesophageal, aortoesophageal (rare but catastrophic)

Thoracic Great Vessel Injury

Injury to thoracic great vessels (excluding aorta) occurs in 0.3-1% of patients with thoracic trauma, primarily from penetrating mechanisms[3]. These injuries are highly lethal with mortality 30-70% depending on vessel involved.

Anatomic Distribution:

• Innominate artery (brachiocephalic): Most common great vessel injury
• Subclavian artery: Common from penetrating trauma to supraclavicular region
• Common carotid artery: Associated with neurologic injury
• Internal jugular vein: Usually associated with carotid injury

Clinical Features:

• Hemorrhagic shock: Often massive bleeding
• Expanding hematoma in supraclavicular region or neck
• Pulse deficit distal to injury
• Neurologic deficit (carotid injury): Stroke, altered consciousness, hemiparesis
• Upper extremity ischemia (subclavian artery): Cold, pale, pulseless arm
• Active bleeding from wound

Diagnosis:

Immediate Assessment:

• eFAST: May detect hemopericardium if proximal injury, or hemothorax
• CXR: Widened mediastinum, apical pleural cap, hemothorax
• Clinical suspicion: High for penetrating injuries in neck or supraclavicular region

Definitive Imaging:

• CT Angiography: Gold standard for stable patients

  • Vessel occlusion or transection
  • Active contrast extravasation
  • Pseudoaneurysm formation

• Conventional Angiography:

  • Allows simultaneous intervention
  • Useful for endovascular treatment

Management:

Initial Resuscitation:

• Direct pressure: Control external bleeding
• Large-bore IV access: 2-3 large-bore catheters
• Blood transfusion: Massive transfusion protocol as indicated
• Immediate operative intervention for hemorrhagic shock

Endovascular Repair (Increasingly preferred):

• Indications: Pseudoaneurysm, contained injury, suitable anatomy
• Advantages: Lower morbidity, no thoracotomy
• Technique: Covered stent graft placement

Open Surgical Repair:

• Indications: Active hemorrhage, proximal injuries, unsuitable for endovascular repair
• Cervical approach: For innominate and proximal carotid injuries
• Thoracic approach: For distal subclavian and innominate artery injuries
• Techniques:
  • Primary repair (lateral arteriorrhaphy)
  • Patch angioplasty
  • Bypass graft (autologous saphenous vein or prosthetic)
  • Ligation (last resort for distal subclavian artery)

Carotid Artery-Specific Considerations:

• Neurologic monitoring: Stroke prevention critical
• Anticoagulation: Heparin or antiplatelet therapy post-repair (if no contraindications)
• Timing of repair: Within 6 hours for penetrating injuries (stroke prevention)
• Shunting: Intraoperative shunt to maintain cerebral perfusion during repair

Complications:

• Stroke (carotid injury): 10-20% even with repair
• Upper extremity ischemia (subclavian artery): 5-10%
• Horner's syndrome (stellate ganglion injury)
• Recurrent laryngeal nerve injury: Hoarseness
• Phrenic nerve injury: Diaphragmatic paralysis
• Graft occlusion or thrombosis
• Infection: Higher with prosthetic grafts

Chylothorax (Thoracic Duct Injury)

Chylothorax from traumatic thoracic duct injury is rare, occurring in 0.5% of patients with thoracic trauma[4]. Most commonly caused by penetrating injury or blunt trauma with hyperextension.

Mechanisms:

• Penetrating: Direct injury to thoracic duct (usually left thoracic cavity)
• Blunt: Hyperextension injuries, sudden deceleration
• Iatrogenic: Post-thoracotomy, esophageal surgery, spine surgery

Anatomy:

• Thoracic duct ascends on right side of thorax until T4-T6
• Crosses to left side at T4-T6 level
• Terminates at junction of left internal jugular and subclavian veins

Clinical Features:

• Dyspnea: From pleural effusion
• Decreased breath sounds
• Dullness to percussion
• Milky-white pleural fluid (diagnostic)
• Delayed presentation: May not appear for 3-7 days post-injury
• Hypovolemia: Significant fluid and electrolyte loss

Diagnosis:

• Chest tube output: Milky-white fluid
• Pleural fluid analysis:
  • Triglycerides greater than 110 mg/dL (diagnostic)
  • Chylomicrons present
  • Lipid-laden macrophages (less specific)
• CT: May identify thoracic duct injury (contrast lymphangiography more sensitive)
• Lymphangiography: Gold standard for localizing injury

Management:

Initial Management:

• Chest tube drainage: 28-32 Fr for adequate drainage

• NPO or low-fat diet: Reduces lymph flow

  • NPO for 3-5 days (complete rest)
  • "Medium-chain triglyceride (MCT) diet: Absorbed directly into portal system, bypasses lymphatics"

• Total parenteral nutrition (TPN): Maintain nutrition while reducing lymphatic flow

Octreotide Therapy:

• Somatostatin analog that reduces splanchnic lymphatic flow
• Dose: 50-100 mcg subcutaneous q8h
• May reduce chylothorax output by 50-70%
• Used as bridge to surgical intervention

Surgical Management:

• Indications:

  • Persistent chylothorax greater than 1-2 liters/day for 5 days
  • Persistent chylothorax greater than 500 mL/day for 2 weeks
  • Nutritional compromise despite conservative measures
  • Delayed diagnosis (greater than 14 days)

• Thoracoscopic ligation:

  • VATS approach (left thoracotomy for most injuries)
  • Preoperative lymphangiography to localize injury
  • Direct ligation of thoracic duct

• Pleurodesis: For chronic chylothorax or inoperable patients

Complications:

• Malnutrition: Protein, fat-soluble vitamin, lymphocyte loss
• Immune compromise: Lymphocyte depletion
• Electrolyte abnormalities: Hyponatremia, hypokalemia
• Persistent chylothorax: Requires longer duration of conservative therapy

Ventilator Management in Chest Trauma

Patients with chest trauma requiring mechanical ventilation present unique challenges due to lung injury, chest wall instability, and risk of complications.

Lung-Protective Ventilation:

Tidal Volume:

• Target 6 mL/kg predicted body weight
• Prevents ventilator-induced lung injury (VILI) in contused lung
• Allow permissive hypercapnia (PaCO2 up to 50-60 mmHg) to limit tidal volume

PEEP Selection:

• Moderate PEEP (5-10 cmH2O) improves oxygenation
• Higher PEEP (10-15 cmH2O) for severe ARDS from contusion
• Caution: Excessive PEEP may worsen pneumothorax or cause barotrauma
• Individualize based on lung compliance and oxygenation

Plateau Pressure:

• Target below 30 cmH2O
• Prevents barotrauma in contused lung
• May require lower tidal volumes if plateau pressure elevated

Driving Pressure:

• Plateau pressure - PEEP
• Target below 15 cmH2O associated with reduced mortality in ARDS[5]
• Useful metric for titrating PEEP and tidal volume

Flail Chest Specific Considerations:

Surgical Stabilization vs Ventilator Management:

• Surgical fixation reduces ventilator days and ICU stay
• If fixation not performed, internal pneumatic stabilization may be used

Internal Pneumatic Stabilization:

• Synchronizing ventilator with respiratory effort
• Larger tidal volumes to "stabilize" flail segment (controversial)
• Higher risk of barotrauma - generally avoided with modern lung-protective ventilation

Analgesia-Synchronized Ventilation:

• Effective analgesia (epidural, paravertebral) allows patient to drive ventilation
• Spontaneous breathing modes (PSV, CPAP) preferred
• Improves diaphragmatic function and reduces atelectasis

Bronchial Injury Specific Considerations:

Airway Management:

• Fiberoptic bronchoscopy-guided intubation
• Mainstem intubation of uninjured bronchus
• Selective lung ventilation possible with double-lumen tube (rarely needed)

Ventilator Settings:

• Lower tidal volumes (4-6 mL/kg)
• Lower airway pressures to prevent anastomotic disruption
• Higher PEEP to recruit uninjured lung

Pulmonary Contusion Specific Considerations:

Progressive Nature:

• May worsen over 24-72 hours
• Serial monitoring of oxygenation, compliance, CXR
• Prepare for escalating respiratory support

Fluid Management:

• Conservative fluid strategy (net negative balance)
• Avoid crystalloid overload
• Diuretics (furosemide 20-40 mg IV) for pulmonary edema
• Consider CRRT if severe fluid overload

Recruitment Maneuvers:

• Gentle recruitment for hypoxemic patients
• Sustained inflation (30-40 cmH2O for 30 seconds)
• Assess response before repeating

Weaning Challenges:

• May require prolonged ventilation (5-14 days) for severe contusion
• Daily spontaneous breathing trials
• Tracheostomy after 7-10 days if anticipated prolonged ventilation

Diagnostic Strategies

FAST/eFAST Examination

The FAST (Focused Assessment with Sonography for Trauma) examination is a rapid bedside assessment for free fluid in the abdomen and pericardium. The eFAST (Extended FAST) adds pleural views for pneumothorax and hemothorax assessment.

Six Views:

1. Right Upper Quadrant (RUQ): Morison's pouch, hepatorenal recess
2. Left Upper Quadrant (LUQ): Splenorenal recess, perisplenic space
3. Suprapubic: Pelvis, rectovesical or rectouterine pouch
4. Pericardial: Subxiphoid view
5. Right Pleural: Fourth intercostal space, midaxillary line
6. Left Pleural: Fourth intercostal space, midaxillary line

Diagnostic Criteria:

• Hemoperitoneum: Anechoic or hypoechoic fluid in dependent spaces

  • Sensitivity 68-74%, specificity 95-98%[25]
  • Requires 150-250 mL for reliable detection

• Pericardial effusion: Anechoic space between heart and pericardium

  • Sensitivity 90-95%, specificity 98-100%
  • "Tamponade: Diastolic collapse of right atrium/ventricle, respiratory variation"

• Pneumothorax:

  • Absence of lung sliding
  • Absence of comet tail artifacts (B-lines)
  • Presence of lung point (transition between sliding and non-sliding lung - 100% specific)[26]
  • Sensitivity 86-98%, specificity 97-99% (vs. 50% for supine CXR)

• Hemothorax: Anechoic fluid in pleural space

  • Sensitivity 92-96%, specificity 99-100%

Limitations:

• Operator-dependent
• False negatives: Small pneumothoraces, small volume hemoperitoneum, retroperitoneal bleeding
• False positives: Atelectasis mimicking pleural fluid, subcutaneous emphysema obscuring lung sliding
• Suboptimal views in obese patients or with extensive subcutaneous emphysema

Chest X-ray

Supine AP CXR in Trauma Bay:

• Primary imaging modality during initial assessment
• Identifies gross thoracic pathology
• Limitations: Supine positioning reduces sensitivity for pneumothorax and pleural effusion

Key Findings:

• Pneumothorax: Deep sulcus sign, hyperlucency, pleural line (poor sensitivity supine)
• Hemothorax: Opacification, blunted costophrenic angle
• Rib fractures: Often underdiagnosed, up to 50% missed on CXR
• Pulmonary contusion: Patchy consolidation (may not appear until 6-24 hours)
• Widened mediastinum: Suggests aortic injury (low specificity)
• Subcutaneous emphysema: Air tracking in soft tissues

Limitations:

• Sensitivity for pneumothorax: 50-70% (supine)
• Sensitivity for rib fractures: 50-60% (CT gold standard)
• Limited visualization of posterior structures
• Overlapping structures can mask injuries

Computed Tomography

Indications for Chest CT:

• Abnormal CXR or eFAST requiring further characterization
• High-energy mechanism (significant deceleration, crush injury, fall greater than 3m)
• Hemodynamic stability allowing transfer to CT
• Evaluation for aortic injury, diaphragmatic rupture, or occult injuries

Protocol:

• Intravenous contrast essential
• Thin-slice reconstruction (1-1.5 mm) for multiplanar reformatting
• ECG-gating for aortic evaluation (if feasible)

Diagnostic Yield:

• Identifies additional injuries in 30-50% of patients with normal CXR[27]
• Gold standard for aortic injury, diaphragmatic rupture, pulmonary contusion
• Quantifies pneumothorax/hemothorax severity
• Detects active contrast extravasation (ongoing bleeding)

Timing Considerations:

• Perform after primary survey and stabilization
• In unstable patients, proceed to operating room based on clinical findings and eFAST
• For stable patients with abnormal eFAST or CXR, CT guides management

Management Algorithms

Pneumothorax Management Algorithm

Chest trauma → Dyspnea, decreased breath sounds → eFAST assessment
│
├─ No pneumothorax → Observation, serial monitoring
│
├─ Simple pneumothorax
│  ├─ Small (below 15%), hemodynamically stable, no PPV → Observation + O2
│  └─ Moderate/large (≥15%) or symptomatic or PPV → Chest tube (20-28 Fr)
│
└─ Tension pneumothorax
   ├─ Unstable/hypotensive → Immediate needle decompression → Chest tube
   └─ Stable but clinical suspicion → CXR confirmation → Chest tube

Hemothorax Management Algorithm

Suspected hemothorax → Chest tube insertion (28-36 Fr) → Measure output
│
├─ Initial output below 1500 mL and below 200 mL/hour → Observe
│  ├─ Output below 200 mL/hour × 2-4h → Continue chest tube, monitor
│  └─ Output greater than 200 mL/hour × 2-4h → Thoracotomy or VATS
│
└─ Initial output greater than 1500 mL → Immediate thoracotomy

Chest Tube (Thoracostomy) Technique

Indications:

• Pneumothorax ≥15% lung collapse
• Hemothorax
• Chylothorax (traumatic thoracic duct injury)
• Empyema or post-traumatic pneumonia with effusion
• Post-thoracotomy

Chest Tube Size Selection:

• 36-40 Fr: Massive hemothorax, post-thoracotomy drainage
• 28-32 Fr: Standard hemothorax, pneumothorax
• 20-24 Fr: Small pneumothorax in stable patient, selected pneumothoraces
• Pigtail catheter (10-14 Fr): Small iatrogenic pneumothoraces

Technique:

1. Positioning: Supine with arm abducted, head of bed 30-45°
2. Site: Fourth or fifth intercostal space, anterior axillary line (nipple level)
3. Anesthesia: Local anesthetic to pleura (1% lidocaine)
4. Incision: 2-3 cm incision over upper border of rib
5. Dissection: Blunt dissection through intercostal muscles to pleura
6. Pleural entry: Kelly clamp to puncture pleura, finger sweep to confirm
7. Tube insertion: Clamp chest tube, insert into pleural space, direct posteriorly
8. Secure: Suture chest tube, attach to underwater seal drainage
9. Confirmation: CXR to confirm position (tip posterior in pleural space)

Chest Tube Position:

• Apex for pneumothorax
• Base for hemothorax
• Posterior placement for optimal drainage

Complications:

• Improper placement (intra-abdominal, extrapleural, lung laceration): 2-5%
• Bleeding: 1-3%
• Infection: 1-5%
• Tube dislodgment
• Persistent air leak (bronchial injury): 5-10%

Removal Criteria:

• No ongoing air leak (24 hours clamped trial)
• Drainage below 100-200 mL/24 hours
• Lung fully expanded on CXR
• Resolution of underlying pathology

Special Situations

Thoracic Trauma in Pregnancy

Physiologic Changes:

• Increased blood volume (40-50%), cardiac output (30-50%)
• Elevated diaphragm (reduced thoracic volume)
• Relative anemia of pregnancy
• Aortocaval compression in supine position (left lateral position preferred)

Management Considerations:

• Fetal monitoring after 24 weeks gestation
• Left lateral positioning to avoid aortocaval compression
• CXR with abdominal shielding (radiation below 0.01 Gy considered safe)
• CT indicated if clinical benefit outweighs fetal risk
• Avoid teratogenic medications
• Trauma surgery: Fetal heart rate monitoring, obstetrics consultation
• Perimortem cesarean delivery for viable fetus (greater than 23-24 weeks) in maternal cardiac arrest

Pediatric Chest Trauma

Anatomical Differences:

• More compliant chest wall (less rib fractures, greater force transmitted to lungs)
• Mediastinum more mobile (greater risk of tension pneumothorax)
• Relative proportionally larger heart
• Developing lungs

Injury Patterns:

• Pulmonary contusion more common than rib fractures
• Cardiac contusion higher incidence
• Aortic injury rare but higher mortality

Management:

• Smaller chest tubes (12-24 Fr based on age)
• Lower threshold for mechanical ventilation (respiratory reserve lower)
• Pediatric trauma center transfer for major injuries
• Consider non-accidental trauma if mechanism unclear

Geriatric Chest Trauma

Physiological Changes:

• Reduced respiratory reserve
• Increased comorbidities (COPD, CHF, CAD)
• Decreased bone density (more rib fractures for similar force)
• Blunted immune response

Outcomes:

• Mortality 2-5x higher than younger patients for similar injuries
• Higher complication rate (pneumonia, respiratory failure, ARDS)
• Longer ICU and hospital stay

Management Considerations:

• Aggressive pain management (epidural or paravertebral preferred)
• Early ICU admission for elderly with greater than 2 rib fractures
• High threshold for discharge
• Consider rib fixation for flail chest or multiple fractures
• Early mobilization and pulmonary hygiene

Anticoagulated Patients

Management Considerations:

• Higher risk of bleeding from chest injuries
• Reversal of anticoagulation (warfarin: vitamin K + PCC; DOACs: idarucizumab, andexanet, or PCC)
• Earlier consideration for thoracotomy for ongoing bleeding
• Lower threshold for chest tube placement even for small pneumothoraces (risk of expansion on PPV)

Long-Term Complications

Post-Traumatic Empyema

Empyema occurs in 2-5% of patients with traumatic hemothorax, particularly with retained blood.

Risk Factors:

• Retained hemothorax (greater than 500 mL after initial drainage)
• Delayed chest tube placement (greater than 24 hours)
• Associated lung injury
• Contamination from associated injuries

Prevention:

• Adequate initial drainage (large-bore chest tube)
• Early VATS for retained hemothorax (below 3-5 days)
• Prophylactic antibiotics not routinely recommended (except for penetrating trauma with hollow viscus injury)

Management:

• Antibiotics (covering staphylococcal and streptococcal species)
• Early drainage (chest tube or VATS)
• Thoracotomy for organized empyema with thick peel

Post-Traumatic Restrictive Lung Disease

Severe chest wall injuries (multiple rib fractures, flail chest, chest wall scarring) can lead to restrictive lung physiology.

Risk Factors:

• Flail chest
• Multiple bilateral rib fractures
• Chest wall deformity
• Pulmonary contusion with ARDS

Management:

• Pulmonary rehabilitation
• Treatment of underlying restrictive physiology
• Surgical correction of chest wall deformity if severe
• Long-term follow-up with pulmonary function testing

Chronic Pain

Post-traumatic chest wall pain affects 20-40% of patients with significant rib fractures.

Risk Factors:

• Multiple rib fractures
• Inadequate acute pain management
• Pre-existing chronic pain
• Psychosocial factors

Management:

• Multimodal analgesia
• Physical therapy
• Interventional procedures (intercostal nerve blocks, epidural)
• Consider intercostal neurectomy for refractory pain

Australian Context

Indigenous Health Considerations

Epidemiology:

• Aboriginal and Torres Strait Islander peoples have higher incidence of trauma (2-3× higher than non-Indigenous Australians)[28]
• Higher mortality from traumatic injuries
• Barriers to care: geographic isolation, cultural factors, healthcare access

Cultural Safety Approaches:

• Involve Aboriginal Health Workers or Aboriginal Liaison Officers
• Family and community involvement in decision-making
• Respect cultural protocols and traditional healing practices
• Ensure communication in preferred language or with interpreter
• Consider cultural practices around death and dying

Healthcare Access:

• Remote communities may have limited diagnostic capabilities (no CT, limited specialists)
• RFDS (Royal Flying Doctor Service) retrieval for major trauma
• Transfer to regional trauma centers (Level II/III) or major centers (Level I)
• Telemedicine consultation to support local management

Māori Health Considerations (New Zealand Context)

Epidemiology:

• Māori have higher incidence of trauma (2× higher than non-Māori)
• Higher mortality and poorer outcomes
• Contributing factors: socioeconomic deprivation, rural residence, access to care

Cultural Safety Approaches:

• Whānau (family) involvement in care decisions
• Tikanga (cultural protocols) around body handling and procedures
• Māori Health Workers or cultural liaisons
• Manaakitanga (care and respect) in healthcare delivery

Remote and Rural Management

Diagnostic Limitations:

• No CT in many rural hospitals
• Limited specialist availability (no cardiothoracic surgery)
• eFAST essential for initial assessment
• Transfer decisions based on eFAST findings, CXR, and clinical status

Management Principles:

• Stabilize prior to transfer: chest tube for pneumothorax/hemothorax, airway management, analgesia
• Early consultation with regional trauma center or RFDS
• Consider prophylactic chest tube for small pneumothorax if long transfer time or need for air transport (altitude expansion)
• Document eFAST findings and communicate clearly to receiving hospital

RFDS Retrieval:

• 24/7 retrieval hotline: 1800 625 800 (Australia)
• RFDS medical staff can provide telemedicine support
• Aeromedical transport: altitude expansion of pneumothorax (consider prophylactic chest tube)
• Limited resources during flight: have contingency plans for deterioration

State-Specific Guidelines:

• NSW: Institute of Trauma and Injury Management (ITIM) guidelines
• Victoria: State Trauma System (VSTS) protocols
• Queensland: Trauma Service Queensland guidelines
• Western Australia: WA Trauma System guidelines

Quality and Safety

Chest Tube Management Protocols

Insertion Safety:

• Ultrasound guidance for site selection (particularly for difficult anatomy or obesity)
• Standardized training and competency assessment
• Checklists to reduce errors
• Proper analgesia and sedation

Monitoring:

• Hourly output documentation
• Daily CXR for initial 2-3 days
• Daily assessment for air leak and drainage volume
• Tube position documentation

Complication Prevention:

• Proper tube size selection
• Secure fixation to prevent dislodgment
• Regular dressing changes
• Early mobilization with tube secured

Multidisciplinary Care

Team Members:

• Intensive care physician
• Trauma surgeon (for operative management)
• Cardiothoracic surgeon (for complex thoracic injuries)
• Emergency physician (initial resuscitation)
• Physiotherapist (pulmonary hygiene, mobilization)
• Pain service (epidural, paravertebral blocks)
• Nursing (monitoring, analgesia, chest tube care)

Communication and Documentation

Handoff Considerations:

• Clear documentation of mechanism, injuries, and interventions
• Chest tube output trends
• Hemodynamic status
• Imaging findings and interpretation
• Plan for ongoing management

Family Communication:

• Early discussion of injury severity and prognosis
• Regular updates
• Explanation of interventions (particularly for EDT in emergency setting)
• Cultural considerations for Indigenous and Māori patients

Evidence Summary

Key Clinical Trials and Meta-Analyses:

1. Rib fixation (FLAIL trial): Surgical fixation reduced pneumonia (RR 0.43), tracheostomy (RR 0.44), ICU stay (-5 days), mortality (RR 0.48)[8]

2. Rib fixation meta-analysis: Marasco et al. demonstrated reduced ventilator days (-5.2 days) and ICU stay (-7.1 days) with no increase in complications[7]

3. eFAST vs CXR for pneumothorax: Meta-analysis found eFAST sensitivity 86-98% vs CXR 50-70%, specificity comparable[4]

4. Rib fracture fixation systematic review: PMID 28659901 (Tanasievic et al.) - Surgical fixation reduces mortality, ICU stay, and ventilator days[7]

5. EDT outcomes: Systematic review showing 8-35% survival for penetrating trauma with EDT, below 2% for blunt trauma[18]

6. VATS for retained hemothorax: Early VATS (below 3 days) reduces empyema rates and hospital stay compared to chest tube alone[15]

7. Occult pneumothorax observation: Safe observation strategy for hemodynamically stable patients without PPV, 5-15% requiring subsequent tube[13]

8. TEVAR for aortic injury: Lower mortality and paraplegia compared to open repair, currently first-line for most patients[23]

Assessment Content

SAQ Practice Questions

SAQ 1: Pneumothorax and Hemothorax Management

A 45-year-old male presents after a high-speed motor vehicle collision. He is hemodynamically stable (BP 125/75, HR 110, SpO2 94% on 6L NC). CXR shows a left-sided pneumothorax with approximately 30% lung collapse and small hemothorax with blunted costophrenic angle. eFAST confirms pneumothorax and small pleural effusion.

a. Outline your immediate management plan. (6 marks)

b. The patient develops hypotension (BP 85/50) and increasing oxygen requirement. Chest tube is placed with initial output of 1800 mL of blood. Describe the indications and management of massive hemothorax. (9 marks)

Model Answer:

a. Immediate management (6 marks):

• Supplemental oxygen to maintain SpO2 greater than 94% (1 mark)
• Chest tube insertion: 28-32 Fr in 4th/5th ICS, anterior axillary line (1 mark)
• Analgesia: Multimodal approach (IV opioids + NSAIDs if no contraindications) (1 mark)
• Monitor: Vital signs, respiratory status, chest tube output hourly (1 mark)
• Repeat CXR to confirm lung re-expansion and tube position (1 mark)
• Admit to high-dependency unit for monitoring (1 mark)

b. Massive hemothorax (9 marks):

Indications for thoracotomy (4 marks):

• Initial chest tube output greater than 1500 mL (2 marks)
• Ongoing bleeding greater than 200 mL/hour for 2-4 hours (1 mark)
• Persistent hemodynamic instability despite chest tube (1 mark)

Management (5 marks):

• Immediate thoracotomy (1 mark)
• Large-bore chest tube (28-36 Fr) inserted if not already present (1 mark)
• Blood transfusion: O-negative uncrossmatched initially, then crossmatched (1 mark)
• Autologous blood transfusion from chest tube using cell-saver if no contamination (1 mark)
• Intraoperative identification of bleeding source and control (ligation, stapling, repair) (1 mark)

SAQ 2: Cardiac Injury and Tamponade

A 32-year-old male presents with a single stab wound to the left anterior chest, just lateral to the sternum. He is hypotensive (BP 75/40), tachycardic (HR 140), with distended neck veins and muffled heart sounds. eFAST shows pericardial effusion with cardiac tamponade physiology.

a. Describe the pathophysiology of pericardial tamponade and the clinical findings on physical examination. (5 marks)

b. Outline the immediate management steps for this patient, including definitive treatment options. (10 marks)

Model Answer:

a. Pathophysiology and clinical findings (5 marks):

Pathophysiology (2 marks):

• Blood accumulates in pericardial space increasing intrapericardial pressure (1 mark)
• Equalization of diastolic pressures across all cardiac chambers reduces ventricular filling (1 mark)

Clinical findings (3 marks):

• Beck's triad: Hypotension, muffled heart sounds, distended neck veins (1 mark)
• Pulsus paradoxus: greater than 10 mmHg drop in systolic BP during inspiration (1 mark)
• Elevated JVP, Kussmaul's sign (1 mark)

b. Management (10 marks):

Immediate stabilization (4 marks):

• Needle pericardiocentesis: Subxiphoid approach with 18-gauge needle (1 mark)
• Aspirate until hemodynamic improvement (1 mark)
• Simultaneous blood transfusion (O-negative initially) (1 mark)
• Prepare for operative drainage (1 mark)

Definitive treatment (6 marks):

• Surgical drainage required (needle pericardiocentesis is temporary) (1 mark)
• Options:
  • Pericardial window (subxiphoid or thoracoscopic) for diagnosis and drainage (2 marks)
  • Thoracotomy for direct cardiac repair (2 marks)
  • Sternotomy for cardiac repair or mediastinal exploration (1 mark)

Viva Practice Questions

Viva 1: Blunt Chest Trauma

Examiner: You have a 55-year-old male who was an unrestrained driver in a high-speed motor vehicle collision. He has right-sided chest wall pain and shortness of breath. Vital signs: BP 110/75, HR 105, RR 22, SpO2 93% on 6L NC.

Candidate: I would immediately assess this patient using the ABCDE approach while obtaining a history and focused physical examination.

Examiner: What specific thoracic injuries are you concerned about in this mechanism?

Candidate: Given the high-speed MVC and chest pain, I'm concerned about rib fractures, pulmonary contusion, pneumothorax, hemothorax, and potentially cardiac contusion or aortic injury. The mechanism of blunt trauma increases risk for all of these.

Examiner: The patient has decreased breath sounds on the right side with hyperresonance to percussion. What is your immediate management?

Candidate: This is concerning for a pneumothorax. I would perform eFAST immediately. If eFAST confirms pneumothorax and the patient is stable, I would proceed to chest tube insertion (28-32 Fr) in the 4th/5th intercostal space, anterior axillary line. If the patient were hemodynamically unstable with clinical suspicion of tension pneumothorax, I would perform immediate needle decompression in the 2nd intercostal space, midclavicular line, followed by chest tube.

Examiner: CXR after chest tube placement shows 5 rib fractures on the right (ribs 3-7). How would you manage these rib fractures?

Candidate: With 5 rib fractures, this patient is at increased risk for complications including pneumonia and respiratory failure. I would ensure adequate analgesia using a multimodal approach - starting with IV opioids, and strongly considering epidural or paravertebral block given the number of fractures. I would also implement aggressive pulmonary hygiene with incentive spirometry and early mobilization. I would consider surgical rib fixation if the patient develops a flail segment, requires mechanical ventilation, or has refractory pain despite optimal analgesia.

Examiner: What are the indications for surgical rib fixation?

Candidate: Indications include: flail chest with paradoxical movement requiring mechanical ventilation; 3 or more rib fractures with significant deformity (greater than 2 rib widths) and pulmonary dysfunction; severe pain refractory to optimal analgesia; progressive chest wall deformity; and open rib fractures with thoracotomy required for other injuries. Evidence from the FLAIL trial shows reduced pneumonia, tracheostomy, ICU stay, and mortality with fixation.

Examiner: This patient is 55 years old. Does age affect your management?

Candidate: Yes, age is an important factor. Elderly patients with rib fractures have significantly higher mortality (2-5x higher) and complication rates. For this 55-year-old with 5 rib fractures, I would admit to a monitored setting, consider ICU admission given the number of fractures, and have a lower threshold for invasive analgesia techniques. I would also consider early surgical fixation given his age and risk profile.

Viva 2: Penetrating Chest Trauma

Examiner: A 28-year-old male presents with a stab wound to the left chest, lateral to the nipple. He is hypotensive (BP 85/50) and tachycardic (HR 135).

Candidate: This is a penetrating thoracic injury with hemodynamic compromise, which is a life-threatening emergency. I would immediately assess airway, breathing, and circulation while preparing for rapid intervention.

Examiner: What are your differential diagnoses?

Candidate: With lateral chest stab wound and hemodynamic compromise, my primary concerns are: hemothorax, cardiac injury with pericardial tamponade, pneumothorax (possibly tension), and lung laceration. The lateral location makes hemothorax and lung injury more likely than cardiac injury, but cardiac injury cannot be excluded without investigation.

Examiner: How would you evaluate this patient?

Candidate: I would perform eFAST immediately as part of the primary survey. eFAST can detect hemoperitoneum, hemothorax, pneumothorax, and pericardial effusion. Given the hemodynamic instability, I would not delay for CXR. If eFAST shows hemothorax, I would insert a large-bore chest tube (28-36 Fr). If eFAST shows pericardial effusion with tamponade physiology, I would prepare for immediate pericardial drainage, initially with needle pericardiocentesis if patient deteriorates while preparing for OR.

Examiner: eFAST shows a pericardial effusion with tamponade physiology but no pneumothorax or significant hemothorax. What is your management?

Candidate: This patient has cardiac tamponade requiring immediate drainage. I would perform needle pericardiocentesis via subxiphoid approach while preparing for operative drainage. I would insert an 18-gauge needle attached to ECG monitoring and aspirate blood until hemodynamic improvement. However, needle pericardiocentesis is only a temporary measure - this patient requires definitive surgical drainage. I would prepare for immediate transfer to OR for either pericardial window or thoracotomy depending on suspected cardiac injury.

Examiner: What are the options for definitive drainage?

Candidate: Definitive options include: pericardial window (subxiphoid or thoracoscopic) which provides both diagnosis and drainage; thoracotomy which allows direct visualization and repair of cardiac injury; and sternotomy for cardiac repair or mediastinal exploration. The choice depends on suspected injury, surgeon expertise, and patient stability. For this patient with suspected cardiac injury from stab wound, thoracotomy or pericardial window would be most appropriate.

Examiner: What are the indications for emergency department thoracotomy (EDT)?

Candidate: EDT is indicated for: penetrating thoracic trauma with loss of vital signs at the trauma center or witnessed en route; penetrating abdominal trauma with loss of vital signs (lower survival but indicated); and blunt trauma with loss of vital signs at the trauma center (controversial, very low survival). Contraindications include: prolonged asystole (greater than 15 minutes) without CPR, severe coagulopathy, significant comorbidities limiting meaningful survival, and blunt trauma with absent signs of life at scene (extremely poor survival). Outcomes vary by mechanism: penetrating cardiac injury 8-35% survival, blunt trauma below 2% survival.

Examiner: This patient stabilizes after needle pericardiocentesis and is taken to OR. What are the postoperative considerations?

Candidate: Postoperative considerations include: admission to ICU for hemodynamic monitoring, serial cardiac biomarkers to assess for myocardial injury, ECG monitoring for arrhythmias, echocardiography to assess cardiac function and residual effusion, adequate analgesia, and consideration of anticoagulation or antiplatelet therapy if prosthetic material used. Given the mechanism of injury, I would also assess for associated injuries including lung laceration, coronary artery injury, and conduction system injury.

Clinical Pathways and Decision Support

Chest Trauma Assessment Pathway

Primary Survey (ABCDE)
│
├─ Airway compromise → Secure airway (RSI, fiberoptic, surgical airway)
│
├─ Breathing difficulty
│  ├─ Tension pneumothorax (clinical) → Needle decompression → Chest tube
│  ├─ Open pneumothorax → 3-sided dressing → Chest tube
│  ├─ Flail chest + hypoxia → Analgesia + NIV or intubation
│  └─ Massive hemothorax → Chest tube → Thoracotomy if greater than 1500 mL or greater than 200 mL/h
│
├─ Circulation compromise
│  ├─ Pericardial tamponade → Pericardiocentesis → Surgical drainage
│  ├─ Cardiac arrest (penetrating) → EDT
│  └─ Hypotension (unexplained) → Consider cardiac injury, great vessel injury
│
└─ Disability → Assess for head/spine injuries (high association with severe chest trauma)

Secondary Survey
│
├─ eFAST → Identify occult pneumothorax, hemothorax, pericardial effusion
├─ CXR (supine AP) → Identify gross pathology
├─ CT chest (if stable) → Detailed assessment
│
└─ Special studies
   ├─ Bronchoscopy (tracheobronchial injury suspected)
   ├─ CTA (aortic injury suspected)
   ├─ Endoscopy (esophageal injury suspected)
   └─ Lymphangiography (chylothorax suspected)

Analgesia Protocol for Rib Fractures

Multimodal Analgesia Approach:

1. First-line: NSAIDs (ketorolac 15-30 mg IV q6h) + paracetamol 1g IV q6h

   • Contraidications: Renal impairment (eGFR below 30), active bleeding, peptic ulcer disease

2. Regional Anesthesia (for ≥3 rib fractures or flail chest):

   • Thoracic epidural: T4-T10 level, 0.1-0.2% ropivacaine infusion
   • Paravertebral block: Ultrasound-guided at fractured levels, 0.2-0.25% bupivacaine
   • Serratus anterior plane block: Alternative to thoracic epidural

3. Opioids: For breakthrough pain

   • PCA morphine 1-2 mg bolus, 5 min lockout
   • Hydromorphone 0.2-0.4 mg bolus for opioid-tolerant patients

4. Adjunctive agents:

   • Ketamine infusion: 0.1-0.2 mg/kg/h (opioid-sparing, analgesic dose)
   • Gabapentin: 300-900 mg daily for neuropathic pain
   • Lidocaine patch: 5% patch over fracture sites

Monitoring:

• Respiratory rate (watch for opioid-induced respiratory depression)
• Sedation score
• Pain score (target below 4/10)
• Chest wall movement (ensure adequate respiratory effort)

Massive Transfusion Protocol for Chest Trauma

Activation Criteria:

• Anticipated need for greater than 4 units RBC in first hour
• Massive hemothorax (greater than 1500 mL initial output)
• Persistent hypotension despite initial resuscitation
• Base deficit ≥6 mmol/L or lactate ≥4 mmol/L

Blood Product Ratio:

• 1:1:1 (RBC:Plasma:Platelets) or equivalent whole blood
• 1 unit apheresis platelets = 6 units pooled platelets
• Cryoprecipitate (10 units) for fibrinogen below 150 mg/dL

Adjuncts:

• Tranexamic acid: 1g IV bolus + 1g infusion over 8h (if below 3 hours from injury)[6]
• Calcium chloride: 1g IV after every 4 units RBC (maintains ionized Ca)
• Fibrinogen concentrate: 2g if fibrinogen below 150 mg/dL and cryoprecipitate unavailable
• Prothrombin complex concentrate (PCC): If anticoagulated patient (warfarin reversal)

Monitoring:

• Point-of-care coagulation (TEG, ROTEM) to guide therapy
• ABG every 30 minutes during active resuscitation
• Ionized calcium every 2 hours
• Fibrinogen level every 4 hours

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