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.

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

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What is commotio cordis, which NFL player Damar Hamlin says stopped his heart?

Why did Damar Hamlin collapse during the Bills-Bengals game?

NFL Player's Collapse Evokes Rare Sports-Linked Condition - BNN Bloomberg

The ripple effects of Damar Hamlin's cardiac arrest still strong a

Hamlin in their hearts, the NFL pays tribute to No. 3

What we know about Damar Hamlin's condition after cardiac arrest

Bills safety Damar Hamlin participates in first padded practice since cardiac arrest

Hamlin in their hearts, the NFL pays tribute to No. 3

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Updates about Damar Hamlin vigil, injury during Bills-Bengals game

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