In a healthy heart, the rate and rhythm of the heartbeat are controlled by an electrical system. A series of coordinated electrical signals start in a part of the heart called the Sinus Node. The electrical impulse then spreads across the heart and tells it when and where to contract, or squeeze. This synchronized heartbeat continuously circulates blood from the lungs, through the heart, and out to the rest of the body to deliver oxygen. In people with atrial fibrillation --also called AFib--the electrical signals are abnormal, and largely chaotic, and cause the heart's chambers to beat irregularly, and often rapidly. If you have been diagnosed with AFib, you are not alone. AFib is the most common type of irregular heartbeat, and an estimated 2.7 to 6.1 million Americans are living with AFib. Some people with AFib never experience symptoms and are diagnosed when a healthcare professional detects an irregular heartbeat. It's estimated that one-third of Americans who have AF...