Commotio cordis
Background
- Sudden cardiac arrest from blunt, non-penetrating chest wall impact in the absence of underlying cardiac disease or structural damage[1]
- 50% of cases occur during competitive sports (baseball is most common)
- Most commonly affects young males (median age 14)[2]
- Autopsy shows structurally normal heart with no myocardial contusion, rib fracture, or other thoracic injury
Blunt cardiac injury
- A spectrum of disease due to blunt trauma to the chest wall
- Ranges from cardiac contusion to infarction to cardiac rupture and death.[3]
- Commotio cordis is sudden cardiac arrest resulting from blunt chest trauma, in absence of underlying cardiac disease[4]
- Up to 20% of all MVC deaths are due to blunt cardiac injury
Pathophysiology
- Primary electrical event: blow to precordium during the vulnerable period of repolarization (10-30 ms before T-wave peak) triggers ventricular fibrillation
- Risk factors for commotio cordis:
- Impact directly over the cardiac silhouette
- Young, compliant chest wall (transmits more energy)
- Velocity of projectile 30-50 mph (neither too slow nor too fast)
- Small, hard projectile (baseball, hockey puck, lacrosse ball)
Clinical Features
- Witnessed collapse immediately after chest wall impact
- Cardiac arrest — usually ventricular fibrillation
- No external signs of significant chest wall injury
Differential Diagnosis
Thoracic Trauma
- Airway/Pulmonary
- Cardiac/Vascular
- Musculoskeletal
- Other
Evaluation
- Clinical diagnosis based on witnessed event and mechanism
- Post-resuscitation workup if ROSC achieved:
- ECG: may show ST changes or arrhythmias
- Troponin (to evaluate for myocardial injury)
- Echocardiography: should be structurally normal (distinguishes from blunt cardiac injury)
- CT chest to rule out other traumatic injuries
Management
- Immediate CPR and early defibrillation — standard ACLS or PALS cardiac arrest management
- Early defibrillation is key: survival rates improve significantly with prompt AED use
- Overall survival ~25% (improving with increased bystander CPR and AED availability)
Disposition
- Admit to ICU if ROSC achieved
- Post-arrest care per Post cardiac arrest protocol
- Cardiology consult for monitoring and risk stratification
- Consider ICD discussion if recurrent arrhythmias post-resuscitation
Prevention
- Chest protectors (limited efficacy — cannot fully prevent commotio cordis)
- Safety baseballs (softer core) reduce risk
- AED availability at all youth sporting events
See Also
References
- ↑ Menezes RG, et al. Commotio cordis: A review. Med Sci Law. 2017 Jul;57(3):146-151. PMID 28587536
- ↑ Lee RN, et al. Commotio Cordis in Non-Sport-Related Events: A Systematic Review. JACC Clin Electrophysiol. 2023 Aug;9(8 Pt 1):1321-1329. PMID 37558288
- ↑ El-Menyar A, Al Thani H, Zarour A, Latifi R. Understanding traumatic blunt cardiac injury. Ann Card Anaesth. 2012 Oct-Dec;15(4):287-95. doi: 10.4103/0971-9784.101875.
- ↑ Yousef R, Carr JA. Blunt cardiac trauma: a review of the current knowledge and management. Ann Thorac Surg. 2014 Sep;98(3):1134-40. doi: 10.1016/j.athoracsur.2014.04.043.