Millions watched as Buffalo Bills’ Damar Hamlin suffered cardiac arrest during a football game. Medics rushed to perform CPR. He is on the path to recovery, but that isn’t always the case for everyone. San Diegans Diane McGrogan and Selam Tesfalidet do not know each other, but they share something in common with Hamlin. "I heard heavy beating in my chest. I've never heard that before," said Tesfalidet. "I walked up to the ER and dropped dead at the front door," said McGrogan. They both suffered sudden cardiac arrests unexpectedly. They are active people that lead healthy lifestyles, so it was a shocking moment when McGrogan felt subtle chest pains and collapsed at the Sharp Memorial’s ER doors. Tesfalidet, who runs and bikes everyday, suddenly felt heavy chest pains, so his son rushed him to the hospital. Thanks to Sharp Memorial’s Dr. Arvin Narula and other medical staff, both of their lives were saved. MORE: https://www.cbs8.com/article/news/local/cardiac-arrest-survivors-saved-with-ecmo-technology-here-is-how-ecmo-works/509-2b7447f3-5d8e-4a98-af31-6cc359167cea