Maheer Gandhavadi, MD, a cardiologist with The Everett Clinic discusses Afib. Atrial fibrillation (or Afib) is the most common arrhythmia in the world - the top part of the heart goes out of sync. This causes your heart to get confused and to beat irregularly. Afib can also cause blood clots. For most people with Afib, just following up with your primary care provider is sufficient. In other cases, other treatments might be a good option - blood thinners that prevent the risk of stroke, medication as well as an ablation procedure. The longer you stay in Afib, the harder it is to make the Afib go away.