During a football game televised live on Monday night, Buffalo Bills safety Damar Hamlin fell to the ground and went limp after taking a hit to the chest and head by a player for the Cincinnati Bengals. According to a statement released by the Bills, Hamlin’s collapse was caused by cardiac arrest — the 24-year-old’s heart stopped beating after the tackle.

On-site medical professionals administered CPR (cardiopulmonary resuscitation) for approximately 10 minutes before Hamlin was placed on a stretcher and transported via ambulance to the University of Cincinnati Medical Center, where he is undergoing further testing and treatment, per the statement.

What Is Cardiac Arrest and How Is It Different From Heart Attack?

In cardiac arrest, a malfunction of the heart’s electrical system causes the heart to stop beating properly, according to the American Heart Association (AHA). This in turn halts the flow of blood to the brain and other vital organs, according to MedlinePlus.

Heart issues linked to cardiac arrest include ventricular tachycardia (fast heart rate) and ventricular fibrillation (a serious, abnormal heart rhythm). Some cardiac arrests are also caused by extreme slowing of the heart’s rhythm, called bradycardia.

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