Why does an irregular heartbeat show up 40 years early for some people?
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
<p>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</p>