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Doctors are calling on the public to familiarize themselves with lifesaving CPR techniques after Buffalo Bills safety Damar Hamlin suffered cardiac arrest during a football game Monday night in Cincinnati. (Bendix, Martin and Lewis, 1/4)

"This differentiation between cardiac arrest and heart attack is really important because they are two things that can both occur in the same person or be completely separate," Dr. Deepak Bhatt, an expert in cardiovascular medicine and director of Mount Sinai Heart in New York City, told ABC News. (Kekatos, 1/3)

Dr. Mariell Jessup, chief science and medical officer of the American Heart Assn., said she couldn’t say for sure what caused Buffalo Bills safety Damar Hamlin’s heart to stop during an NFL game Monday night. But she was sure of one thing: “Everyone needs to know how to do CPR.” (Healey, 1/4)

Buffalo Bills safety Damar Hamlin demonstrated signs of improvement following the injury that led to him suffering cardiac arrest on the field during a game, the team announced Wednesday, although he remained listed in critical condition in the intensive care unit of a Cincinnati hospital. (Maske, 1/4)