Home > Heart Disease > Atrial Fibrillation Get the Flash Player to see this player. Rate: (Click the stars to rate) Published on Nov 27, 2010 by JeffersonHospital, Views: 3980 More than two million Americans are affected by atrial fibrillation -- the most common abnormality of heart rhythm. Atrial fibrillation can cause symptoms of palpitations, lightheadedness, and fatigue. AFib also puts you at risk for blood clots and stroke. Usually medications are adequate to treat the problem, but some people may need catheter ablation of this heart rhythm.