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Atrial fibrillation is the most common cardiac arrhythmia, affecting around 1.8 million people, and is a serious condition. If left unnoticed and untreated, it can be life-threatening for the heart and brain, leading to heart failure and stroke. This DHZB information video explains in an easy-to-understand way what happens in the heart with cardiac arrhythmias in general and atrial fibrillation in particular.