LOUISVILLE, Ky. — Monday night, Buffalo Bill's center Damar Hamlin collapsed in the first quarter of the football game after a play.

Now, UofL Health doctors say it looks like a hit to the chest could have caused a disturbance in his heart's rhythm.

Dr. Kim Williams with UofL Health said it could happen when a hard object hits the middle of the sternum, at a vulnerable time in your heartbeat, effectively stopping your heart.

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Cardiopulmonary resuscitation (CPR) and an automated external defibrillator (AED) can shock the heart back to life. An AED is used to deliver a shock to the heart to help get it back into a rhythm according to the American Red Cross.

The Bills say Hamlin suffered a cardiac arrest during their game against Cincinatti.

Williams says it shows how critical it is to know CPR.

"When it happens in the community, we have a huge ethnic disparity between survival of whites versus Blacks, because of our lack of knowledge in our community for doing the CPR immediately," he said.

He says this is a call for people to become CPR certified and to know how to use an AED.

If you want to look for CPR classes near you, click here.

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