US President Joe Biden has the heart condition atrial fibrillation. This increases his risk of having a stroke five-fold and doubles the risk of a heart attack or dementia.
More than 37.5 million people globally also have atrial fibrillation, but many don’t realise they have it.
For most, the condition has few symptoms and does not limit daily life. However, identifying it and treating it is the only way to reduce its serious health consequences.
