What is commotio cordis, which NFL player Damar Hamlin says

Buffalo Bills safety Damar Hamlin says commotio cordis caused his "Monday Night Football" collapse. Here's an explanation of the rare, heart-stopping condition.

Commotio cordis injuries

Bills safety Damar Hamlin returns to action in first regular-season game since cardiac arrest - The San Diego Union-Tribune

Christin LeBoeuf on LinkedIn: NBA TV on Twitter

What we know about commotio cordis and Damar Hamlin's injury

What happened to critically injured NFL player Damar Hamlin? A University of Maryland Medical System cardiologist explains. – Baltimore Sun

NFL player's cardiac arrest was a triggering, traumatic event for

Damar Hamlin's Inspiring Journey: From Cardiac Arrest on the Field

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Damar Hamlin cleared to play, 4 months after cardiac arrest – The Denver Post

Very rare - the perfect storm': Cardiologist on NFL star Damar Hamlin's on-field collapse, US News

OHSU heart doctor talks Damar Hamlin injury

A fastball to the chest sent college baseball player into cardiac