What Is Atrial Fibrillation?
Atrial fibrillation, sometimes called "Afib", is the most prevalent type of heart arrhythmia (abnormal heart rhythm) and causes an irregular (and often rapid) heartbeat. With atrial fibrillation, the heart's upper chambers beat irregularly, affecting blood flow to the heart muscle and to the rest of the body. This can cause blood clots leading to a stroke.
What Happens During Afib?
During atrial fibrillation, the top chambers of the heart (the atria) lose their normal, organized electrical activity and develop a chaotic, unorganized rhythm that makes the bottom chambers (the ventricles) beat irregularly.
Atrial fibrillation often causes an erratic fluttering sensation in the chest (palpitations) and makes the heart a less efficient pump. This may result in symptoms of weakness, fatigue, dizziness, or shortness of breath. However, some patients who have atrial fibrillation are completely unaware of it and have no symptoms at all.
Types and Complications of Atrial Fibrillation
Atrial fibrillation may be paroxysmal or persistent. Paroxysmal atrial fibrillation refers to atrial fibrillation that comes and goes on its own. The episodes may last anywhere from a few minutes to several hours, and sometimes several days. Persistent or chronic atrial fibrillation lasts for more than seven days. In patients with persistent atrial fibrillation, a normal heart rhythm is restored by treatment.
Because of the sluggish movement of blood through the atria during atrial fibrillation, there is a tendency for blood clots to form in some patients. This can lead to complications such as stroke. For this reason, medications that thin the blood, such as aspirin or warfarin, are necessary for some patients with atrial fibrillation.
Risk Factors for Atrial Fibrillation
Risk factors for atrial fibrillation include:
- Age older than 60 (although afib can affect a younger population as well)
- Being white and male
- Sleep apnea
- Heart failure
- Heart valve disease
- High blood pressure
- Coronary artery disease and heart attack
- Family history of atrial fibrillation
- Surgery on the heart
- History of rheumatic fever
- Infection, such as pneumonia or endocarditis
- Lung disease, such as asthma or chronic obstructive pulmonary disease
- Metabolic conditions, such as hyperthyroidism or diabetes
- Use of alcohol and/or stimulants
- Congenital heart disease and surgical repair of congenital heart disease
Atrial Fibrillation Treatments
Some individuals feel fine when they are in atrial fibrillation. This is more often the case in older patients who are not very active than in younger, more active patients. If the atrial fibrillation is not causing any symptoms, sometimes the best course of action is to simply live with it instead of receiving medications or other treatments in an attempt to restore a normal heart rhythm. For those patients, medications may still be needed to prevent a rapid heart rate and to prevent blood clots.
Many people can be treated by medication alone, and a number of treatments for afib are outpatient-based. We offer a variety of treatment options, depending on the condition of the patient, including:
- Drug therapy
- Electrical cardioversion
- Catheter ablation
- Implantable cardiac defibrillator (ICD)
Some patients with paroxysmal atrial fibrillation (the type that comes and goes, as compared to persistent atrial fibrillation, which can stay for more than a week) also have right atrial flutter. Right atrial flutter results from a “short circuit” in the right atrium and causes symptoms that are very similar to the symptoms of atrial fibrillation. Most patients cannot tell the difference between atrial fibrillation and atrial flutter.
Make an Appointment
The Arrhythmia Program at the University of Michigan has been a national and international leader in the treatment of atrial fibrillation for more than 30 years. To schedule an appointment to discuss your heart arrhythmia or other cardiovascular condition, call us at 888-287-1082 or email us at CVCCallCtr@med.umich.edu. Visit our Make an Appointment page for more information about what to expect when you call us.