One patient's death changed the course of Dr. Lilia Cervantes' career. The patient, Cervantes says, was a woman from Mexico with kidney failure who repeatedly visited the emergency room for more than three years. In that time, her heart had stopped more than once, and her ribs were fractured from CPR. The woman finally decided to stop treatment because the stress was too much for her and her two young children. Cervantes says she died soon after.