What are the possible causes of chest pain after a fall?

Chest Pain After a Fall: Differential Diagnosis and Evaluation

After a fall, chest pain most commonly indicates rib fractures, chest wall contusions, or costochondral injuries, but life-threatening causes including cardiac contusion, pneumothorax, pulmonary contusion, and aortic injury must be systematically excluded based on mechanism of injury, vital signs, and clinical presentation. 1

Immediate Life-Threatening Causes to Exclude

The differential diagnosis of potentially life-threatening conditions following chest trauma encompasses:

• Cardiac injuries: Myocardial contusion, cardiac chamber rupture, coronary dissection, pericardial tamponade, and valvular injuries from direct anterior chest impact or compression between sternum and spine 2
• Aortic injury: Blunt aortic injury or dissection from deceleration forces, presenting with severe chest or back pain 1, 2
• Pneumothorax: Characterized by acute chest pain, pleuritic in nature, with potential unilateral absence of breath sounds 3, 4
• Pulmonary embolism: Can develop post-trauma, presenting with chest pain and dyspnea 1, 5
• Hemothorax: From vascular or lung parenchymal injury 6

Common Musculoskeletal Causes

Musculoskeletal injuries represent the most frequent etiology of post-traumatic chest pain and include:

• Rib fractures: The most common traumatic chest wall injury, often diagnosed clinically with point tenderness over affected ribs 7, 8
• Chest wall contusions: Direct soft tissue injury causing localized pain that worsens with movement or palpation 1, 8
• Costochondral separation: Injury to the cartilaginous attachments between ribs and sternum 8, 9
• Sternal fractures: From direct anterior impact, causing midline chest pain 7
• Muscle strains: Intercostal or pectoralis muscle injuries from the fall mechanism 8, 10

Clinical Assessment Algorithm

Key historical features that distinguish traumatic from life-threatening causes:

• Pain characteristics suggesting musculoskeletal origin: Pain that varies with respiration, body position, or movement; well-localized pain on the chest wall; reproducible tenderness with palpation 1, 3
• Red flags for serious injury: Severe prolonged pain of acute onset, hemodynamic instability (tachycardia, hypotension), respiratory distress, associated cold sweats, nausea, or altered consciousness 1
• Mechanism assessment: High-energy mechanisms (motor vehicle accidents, falls from height) increase risk for cardiac and aortic injuries 2

Physical examination priorities:

• Cardiovascular examination: Assess for pulse differentials (aortic dissection), muffled heart sounds (tamponade), new murmurs (valvular injury), or signs of shock 3, 2
• Respiratory examination: Evaluate for asymmetric breath sounds (pneumothorax/hemothorax), respiratory distress, or paradoxical chest wall movement 3, 4
• Chest wall palpation: Identify focal tenderness, crepitus, or deformity suggesting fractures; chest wall tenderness markedly reduces probability of cardiac causes 3, 8

Diagnostic Imaging Approach

Initial imaging strategy based on clinical presentation:

• Chest radiography: Appropriate as first-line imaging for stable patients to evaluate for rib fractures, pneumothorax, and other thoracic injuries, though sensitivity for rib fractures is limited (detected in only 4.9% in one series) 7
• CT chest: Superior for detecting and characterizing chest wall abnormalities, occult rib fractures, pneumothorax, pulmonary contusions, and mediastinal injuries in patients with concerning mechanisms or clinical findings 7, 2
• ECG-gated cardiac CT angiography: Indicated when cardiac injury is suspected based on mechanism (high-energy anterior chest impact), ECG abnormalities, elevated cardiac biomarkers, or hemodynamic instability 2
• Focused echocardiography (FAST): Useful for rapid triage to detect pericardial effusion/tamponade or hemothorax in unstable patients 2

Critical Pitfalls to Avoid

• Underestimating occult injuries: Patients may have normal initial chest radiographs despite significant injuries; maintain high suspicion with high-energy mechanisms 7, 2
• Delayed cardiac complications: Myocardial contusion can present with delayed arrhythmias or wall motion abnormalities; ECG monitoring is essential for high-risk patients 2
• Missing aortic injury: Aortic injuries have high pre-hospital mortality; any patient with severe chest pain after deceleration injury requires urgent CT angiography 1, 2
• Inadequate pain control: Untreated chest wall pain leads to splinting, hypoventilation, and increased pulmonary complications 8

Management Priorities

For suspected serious injuries:

• Immediate activation of emergency medical services (9-1-1) for transport to emergency department 3
• Hemodynamic stabilization and supplemental oxygen as needed 1
• Serial cardiac biomarkers and ECG monitoring if cardiac injury suspected 2

For confirmed musculoskeletal injuries:

• Adequate analgesia to prevent respiratory complications from pain-related splinting 8
• Most musculoskeletal chest wall pain (including costochondritis and uncomplicated rib fractures) can be managed conservatively with reassurance and pain control 7, 8
• Incentive spirometry and pulmonary hygiene to prevent atelectasis and pneumonia 8