Damar Hamlin, a player for the professional football team from Buffalo, New York, suffered a cardiac arrest during a game seen on national television Monday night. Health website Hopkins Medicine says a cardiac arrest is when the heart stops beating. This stops blood flow to the brain and other organs. Cardiac arrest can cause a person to lose consciousness, become disabled, or die if they are not treated immediately. The Buffalo Bills football team said in a statement, “Damar Hamlin suffered a cardiac arrest following a hit in our game versus the Bengals. His heartbeat was restored on the field…” The team added, “He is currently sedated and listed in critical condition.” The incident happened in a big Monday night game between the Bills and the Cincinnati Bengals. After stopping a Bengals player, Hamlin stood up and quickly collapsed on the field. Medical workers then performed cardio-pulmonary resuscitation, or CPR, an emergency measure, to restart his heartbeat on the field.