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.

Bills' Damar Hamlin suffered cardiac arrest vs. Bengals. Here is what happened

Commotio cordis - Wikipedia

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

Rare combination of factors likely led to Damar Hamlin's on-field cardiac arrest, Houston heart doctor says – Houston Public Media

What is commotio cordis, which NFL player Damar Hamlin says

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Christin LeBoeuf on LinkedIn: NBA TV on Twitter

How Cardiac Arrest Became a Household Topic After Damar Hamlin's Collapse

Explainer: What Happened to Buffalo Bills Player Damar Hamlin?, Chicago News

OHSU heart doctor talks Damar Hamlin injury