This irregular heart rhythm can lead to symptoms that negatively impact the quality of life in some people. Others experience no symptoms at all. AFib itself is not life threatening. If left untreated, however, the side effects of AFib can be life threatening, leading to stroke or heart failure. This makes identifying and treating AFib so important.
Atrial fibrillation (AFib) is the most common abnormal heart rhythm. In a normal heart, the four chambers of the heart beat in a steady, rhythmic pattern. With AFib, the atria (upper chambers of the heart) fibrillate (quiver or twitch quickly) and create an irregular rhythm.