Commotio cordis is the medical term for a rare disruption of the heart's
electrical system resulting from a blunt impact to the chest that leads
to sudden cardiac arrest. While commercially available chest protectors have not been shown
in any peer-reviewed studies to prevent commotio cordis, whether such a heart shield provides an extra measure of protection for
athletes playing baseball, lacrosse, and hockey, the sports with the highest rates of sudden death from the condition, is unknown.