An estimated 2.2 million Americans are affected by a heart condition known as atrial fibrillation. Blood that should have been pumped out of the heart remains there, and can potentially lead to blood clots and even a stroke. The likelihood of developing atrial fibrillation increases with age - three to five percent of people over 65 have the condition. Joining us for Martha Jefferson Healthwise today is cardiologist Dr. John Zakaib with more information on detecting and treating atrial fibrillation. Click on the video link to learn about tests that can be done to detect AF, how to treat the condition and who should be seeing their doctor about this condition.