VISUAL GUIDE TO ATRIAL FIBRILLATION

Atrial fibrillation is a condition that disrupts your heartbeat. A glitch in the heart’s electrical system makes its upper chambers (the atria) beat so fast they quiver, or fibrillate. This causes the lower chambers (the ventricles) to beat out of sync.

AFib can be dangerous because it raises your risk of stroke and heart failure.
Watch the slide show at
http://www.webmd.com/heart-disease/atrial-fibrillation/ss/slideshow-af-overview