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Atrial fibrillation is a problem with the heart’s electrical system. When something goes wrong with this system, it’s usually because of other health problems that are causing wear and tear on the heart or making it hard for the heart to do its job. Sometimes it’s because of lifestyle habits-such as smoking or heavy drinking-that…

Heart

Press your hand against your chest. Those little thumps you feel are your heart pumping, moving blood into and out of its chambers and through the rest of your body. Normally, the top part of your heart (the atria) squeezes first, then the bottom part (the ventricles). The timing of these contractions is what moves…

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