Atrial fibrillation or AFib is a condition that disrupts your heartbeat. A glitch in the electrical system of the ticker makes its upper chambers (the atria) beat so fast they quiver, or fibrillate, which causes the lower chambers (the ventricles) to beat out of sync. AFib can be life-threatening beacause it raises your risk of stroke and heart failure. Usually the atria and ventricles work together so the ticker pumps blood in steady rhythm. But in atrial fibrillation, they don't. The irregular beats can cause a fast, fluttering heart rate of 100-175 beats per minute instead of the normal 60-100 beats per minute. Warning Signs : AFib doesn’t cause obvious symptoms for many people. But when there are, they’ll often include an uneven pulse, chest pain, a racing or pounding ticker, a feeling that your heart is fluttering, feeling short of breath, lightheaded or dizziness. When your ticker is in AFib, your blood doesn’t move well throughout your body, and you may f...