An estimated 10 million Americans have atrial fibrillation (AFib), according to the National Institutes of Health's National Heart, Lung, and Blood Institute. AFib is a condition in which the upper chambers of the heart beat out of rhythm with the lower chambers, leading to less efficient blood flow. It is usually the result of age and the lifelong cardiovascular strains on an older heart, but some families carry a rare mutation that puts them at high risk for AF much earlier in life, raising the risk of complications such as stroke or even sudden death.
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