Atrial fibrillation is the most common heart rhythm abnormality, and it results in the upper chamber of your heart beating extremely fast, 500, 600 beats a minute. This causes an irregular rapid heartbeat. It's very much of an age related problem. It's rare before 50, by the time you're 80, one in 10 people have Afib. It's also more common if you have other types of heart disease, if you're very obese, sometimes it runs in families. So it's a very common important problem affecting about over five million adults in the United States. Diagnosis of atrial fibrillation is by obtaining an EKG, which will document atrial fibrillation. And so this is something that your internal medicine doctor may do, maybe picked up incidentally when you're getting a routine checkup, or you may have symptoms. Your heart may be racing. You may feel fatigued, know that something's not right, an EKG is obtained, and you're told you have atrial fibrillation. The first thin