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Drugs that worsen heart failure; what's behind Mary Todd Lincoln's depression

In today's Morning Rounds, CBS News chief medical correspondent Dr. Jon LaPook and Dr. Tara Narula weigh in on a new warning by the American Heart Association that many commonly used medications could cause or worsen heart failure. Also, Dr. LaPook reports on a new study that examines how a physical cause may have driven former First Lady Mary Todd Lincoln's mental struggles and erratic behaviors.
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