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Dr Mark Porter investigates a pioneering research project designed to reduce the psychological trauma experienced by more than half of critically ill patients after a stay in intensive care. Why do treatments on ICU cause hallucinations and post traumatic stress disorder in patients months after they leave hospital? Mark talks to the doctor who believes people over the age of eighty are being overtreated to protect them against heart attack and stroke. He finds out why some of the drugs used could increase their risk of falls. Also in the programme, how lens replacement surgery for cataracts is also being used to correct vision. And why are cases of scarlet fever on the rise?