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Scientists have made progress in piecing together why some people may die of a broken heart. Suffering longer-term stress and then experiencing a stressful event - such as the loss of a loved one - could trigger a condition known as takotsubo syndrome, also known as broken heart syndrome. Symptoms of broken heart syndrome often mimic a heart attack and include chest pain and shortness of breath. Vanessa talk to Sian Harding, professor of cardiac pharmacology at Imperial College London.