Both heart diseases have the potential of becoming serious. However, many doctors and other health care professionals consider atrial flutter to be less serious than atrial fibrillation because flutter symptoms tend to be less severe and flutter waves have a less risk of embolization (clot formation).
Read moreIs atrial flutter life threatening?
Although atrial flutter is usually not life-threatening at first , it does limit how well your heart pumps blood. This can cause a clot to form in your heart. If the clot breaks loose, it could lead to a stroke.
Read more