Cold Hearted: Freezing Atrial Fibrillation

August 20, 2011 12:00:00 AM PDT
About 2.5 million Americans live with atrial fibrillation. It's a disorder where the heart beats abnormally, raising the risk of stroke among those who have it. Medications can help but often stop working after a while. Doctors now have a new tool to help get these hearts back on track.