Which event is defined by blunt force to the precordial region resulting in sudden cardiac arrest, particularly in young athletes?

• A. Commotio cordis
• B. Traumatic asphyxia
• C. Cardiac contusion
• D. Open pneumothorax

Answer: (A)

Commotio cordis is a blunt impact to the chest that can trigger sudden cardiac arrest in young athletes. The key idea is that the blow delivers energy to the precordial region at a very specific moment of the heart’s electrical cycle—during the upstroke of the T wave—causing a dangerous ventricular arrhythmia, typically ventricular fibrillation. Importantly, there’s little to no structural damage to the heart; the problem is an electrical disturbance sparked by the timing of the impact.

This differs from other chest injuries. Traumatic asphyxia results from severe chest compression that impedes venous return and causes facial swelling and airway issues, not an isolated electrical event. A cardiac contusion involves actual injury to the heart muscle from trauma and can present with signs of myocardial damage or dysfunction. An open pneumothorax is air entering the pleural space from a chest wound, leading to lung collapse and respiratory distress, not a sudden electrical collapse.

In practice, recognizing commotio cordis means understanding that rapid defibrillation and CPR are critical, since the heart is often electrically unstable but structurally intact.