As the American Heart Association recognizes CPR and AED Awareness this month, a Lincoln Memorial University-DeBusk College of Osteopathic Medicine (LMU-DCOM) student is reflecting on how those skills helped her save a life across the world last winter. Brianna Mastroianni, who was a second-year medical student (OMS-II) at the time, had just arrived in Dublin, Ireland, after an overnight flight from Boston. She and a friend were feeling groggy b…