The blow to Hamlin’s chest may have thrown his heart’s pumping mechanism out of rhythm, disrupting blood flow to his brain, two experts said Monday night.

Damar Hamlin's heart was shocked using an AED after his collapse. Here's what to know about emergency treatment for cardiac arrest.

Cardiologists reveal what doctors might have done to determine the cause of Damar Hamlin's cardiac arrest after he collapsed on the field during a football game.

Damar Hamlin’s Cardiac Arrest: What We Know and Don’t Know Cardiac doctors say that blows to the chest causing an erratic heart rhythm are highly unusual, but not unheard-of in sports.

Damar Hamlin's accident--and that, more than anything else, seems to be what it was--ought to remind us of the fragility of our kind and how we are all in this brutal and unforgiving world together.

Damar Hamlin commemorated the one-year anniversary of his cardiac arrest during the Buffalo Bills game against the Cincinnati Bengals by getting a heart hands tattoo on the back of his neck.

Damar Hamlin, the Bills defensive back who collapsed on the field after a seemingly routine tackle in early January, revealed the cause of his cardiac arrest while announcing his NFL comeback.

The Buffalo Bills confirmed that Hamlin went into cardiac arrest, it was unclear Tuesday what caused the heart problem. Commotio Cordis has been floated as a cause.

During a football game this year, Damar Hamlin suffered a cardiac arrest due to commotio cordis. Here's what to know about the heart event.

He may be the doctor who oversees the NFL Combine heart evaluations in Indianapolis. But he doesn't know for sure why Damar Hamlin collapsed from sudden cardiac arrest Monday night.

Buffalo Bills safety Damar Hamlin collapsed on the field Monday night after making a tackle in the first quarter of the Bills game against the Cincinnati Bengals.

The Buffalo Bills confirmed that Hamlin went into cardiac arrest, it was unclear Tuesday what caused the heart problem. Commotio Cordis has been floated as a cause.