Afib—atrial fibrillation—is a very common heart rhythm disorder. That doesn’t mean it doesn’t need treatment. Afib happens when the chambers of the heart, driven by electrical signals, suddenly lose their steady pumping pace. The symptoms can be debilitating—and raise your stroke risk. Learn more about this heart rhythm disorder in this video as Paul Wang, Amin Al-Ahmad and Sanjiv Narayan, three doctors from Stanford’s Cardiac Arrhythmia Service, share their knowledge about Afib in this video.