Commotio cordis is the condition of sudden cardiac death or near sudden cardiac 
death after blunt, low-impact chest wall trauma in the absence of structural 
cardiac abnormality. Ventricular fibrillation is the most commonly reported 
induced arrhythmia in commotio cordis. Blunt impact injury to the chest with a 
baseball is the most common mechanism. Survival rates for commotio cordis are 
low, even with prompt CPR and defibrillation.