Damar Hamlin's collapse renews interest in CPR certification

Alyson Poling is the executive director of the American Heart Association of Greater Cincinnati. As a Bengals fan, on Monday night she was one of the millions of live TV viewers who witnessed Buffalo Bills' safety Damar Hamlin suddenly go into what we now know was cardiac arrest during the first quarter of the Monday Night Football game in Cincinnati.

What initially looked like a routine tackle quickly turned into a serious emergency situation that required swift action from first responders on the sidelines.

"We were all thinking, 'This is not going well, something really bad must have happened to him,' " Poling said.

CPR was administered to Hamlin and his heartbeat was restarted on the field in front of teammates and fans before he was rushed to the UC Medical Center for further treatment. He remains there in critical condition.