A cardiac condition called atrial fibrillation, the most common cardiac arrhythmia, can increase an individual's risk of stroke by 500%.

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A cardiac condition called atrial fibrillation, the most common cardiac arrhythmia, can increase an individual's risk of stroke by 500%. "Atrial fibrillation can cause the heart to beat erratically sometimes as fast as 200 beats per minutes," says Anne &Curds, chair of the De--of Medcine at the University at Buffalo (N.Y.). Curds points out...