What is commotio cordis?

Commotio cordis is a rare cause of cardiac arrest that is induced by a blow to the chest in a precise spot at exactly the wrong time in the heartbeat. The only treatment is to restore the heartbeat as soon as possible by using CPR and an automated external defibrillator (AED.)
Gordon F. Tomaselli, M.D., American Heart Association past volunteer president, professor, department of medicine (cardiology), the Marilyn and Stanley M. Katz Dean and Executive Vice President and Chief Academic Officer, Montefiore Medicine, Albert Einstein College of Medicine, Bronx, New York, explains commotio cordis and how to treat it.