Atrial fibrillation

Blood flow through heart, right atrium, right ventricle, left ventricle, blood flow through heart, left atrium, blood flow through heart. In AFib, the beating in the upper chambers of the heart (the left and
right atria) becomes irregular. This makes it harder for blood to flow
from the atria to the lower chambers of the heart (the left and right
ventricles) and to the rest of the body.

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Atrial fibrillation

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