Boston Medical Center's Dr. Natalie Stavas, a pediatric physician, was at the end of the Boston Marathon when she heard the explosions. She says instincts and adrenaline kicked in as she raced toward the devastating scene to aid the wounded. Stavas tells Anderson Cooper she performed CPR on one woman, then cared for another woman who had a sharp object impaled in her groin, and she helped a young man whose foot was severely mangled from the bombings.
Watch more of Anderson's interview with Dr. Stavas:
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