CNN —
Buffalo Bills safety Damar Hamlin, who has been cleared to resume football activities, said Tuesday his cardiac arrest during an NFL game in January was caused by commotio cordis.
Hamlin went into cardiac arrest after making a tackle and appearing to be hit with a helmet in his chest during the first quarter of the Bills’ game against the Cincinnati Bengals on January 2.
Commotio cordis can occur when severe trauma to the chest disrupts the heart’s electrical charge and causes dangerous fibrillations.
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