Topic Overview
What is atrial fibrillation?
Atrial fibrillation
(say "AY-tree-uhl fih-bruh-LAY-shun") is the most common type of irregular heartbeat (arrhythmia).
Normally, the
heart beats in a strong, steady rhythm. In atrial fibrillation, a problem with
the heart's electrical system causes the two upper parts of the heart, the atria, to quiver,
or fibrillate.
The quivering upsets the normal rhythm between the atria and the
lower parts of the heart, the ventricles. And the ventricles may beat fast and without a regular rhythm.
This is dangerous
because if the heartbeat isn't strong and steady, blood can
collect, or pool, in the atria. And pooled blood is more likely to form clots. Clots can travel to the brain, block blood flow, and cause a stroke.
Atrial fibrillation can also lead to
heart failure.
What causes atrial fibrillation?
Conditions that
damage or strain the heart commonly cause atrial fibrillation. These
include:
- High blood pressure.
- Coronary artery disease.
- Heart attack.
- Heart valve disease.
Other possible causes include:
- Other medical problems, such as heart failure, lung
disease,
pneumonia, or a high thyroid level.
- Heart
surgery.
- Heavy alcohol use. This includes having more than 3 drinks a day over
many years as well as drinking a large amount
of alcohol at one time (binge drinking).
What are the symptoms?
Symptoms may
include:
- Feeling dizzy or lightheaded.
-
Feeling out of breath.
- Feeling weak and tired.
- Feeling like the heart is fluttering, racing, or pounding (palpitations).
- Feeling like the heart
is beating unevenly.
- Having chest pain.
- Fainting.
Sometimes atrial fibrillation doesn't cause obvious symptoms.
If you have symptoms, see your doctor. Finding and treating atrial fibrillation right away
can help you avoid serious problems.
How is atrial fibrillation diagnosed?
The doctor will ask questions about your past health, do a physical exam, and order tests.
The best way to find out if you have atrial fibrillation is to have an electrocardiogram (EKG or ECG). An EKG is a test that checks for problems with the heart's electrical activity.
You might also have lab tests and an echocardiogram. An echocardiogram can show how well your heart is pumping and whether your heart valves are damaged.
How is it treated?
Your treatment will depend on the cause of your atrial fibrillation, your symptoms, and your risk for stroke.
Medicines are an important part of treatment. They may include:
- Blood-thinning medicine to help prevent strokes.
- Rate-control medicines to keep your heart from beating too fast during atrial fibrillation.
- Rhythm-control medicines to help bring your heart rhythm back to normal.
Doctors sometimes
use a procedure called cardioversion to try to get the heartbeat back to normal. This can be done using either medicine
or a low-voltage electrical shock (electrical cardioversion).
If you have symptoms that are hard to live with, ablation may help. It destroys
small areas of the heart to create scar tissue. The scar tissue blocks or destroys
the areas that are causing the abnormal heart rhythm.
What can you do at home for atrial fibrillation?
Atrial fibrillation is often the result of heart disease or damage. So
making changes that improve the condition of your heart may also improve your
overall health.
- Don't smoke. Avoid secondhand smoke too.
- Eat a
heart-healthy diet with plenty of fish, fruits, vegetables, beans, high-fiber
grains and breads, and olive oil.
- Get regular exercise on most,
preferably all, days of the week. Your doctor can suggest a safe level of
exercise for you.
- Stay at a healthy weight. Lose weight if you need to.
- Manage other health problems such as high blood pressure, high cholesterol, and diabetes.
- Manage your stress. Stress can damage your heart.
- Avoid
alcohol if it triggers symptoms.
- Avoid getting sick from the
flu. Get a flu shot every year.
Frequently Asked Questions
Learning about atrial fibrillation: | |
Being diagnosed: | |
Getting treatment: | |
Living with atrial fibrillation: | |
Cause
Atrial fibrillation is a problem with the
heart's electrical system.
When something goes wrong with this system, it's usually because of other health problems that are causing wear and tear on the heart or making it hard for the heart to do its job. Sometimes it's because of lifestyle habits-such as smoking or heavy drinking-that are hard on the heart.
Problems that affect the heart's structure
Atrial fibrillation is often caused by a health problem that directly affects the heart, including:
Other health problems
Atrial fibrillation can also be caused by other health problems, including:
Atrial fibrillation caused by a condition that is
treatable, such as pneumonia or hyperthyroidism, often goes away when that
condition is treated.
In some cases, doctors cannot find the cause
of atrial fibrillation.
Symptoms
Atrial fibrillation is often discovered during routine
medical checkups, because many people don't have symptoms. Others may notice an
irregular pulse but don't have other symptoms.
Mild symptoms of atrial fibrillation may
occur immediately. More serious problems may occur after the start of
atrial fibrillation and over the course of several days. So it is important to
identify symptoms and get treatment as soon as possible.
Symptoms include:
- Heart palpitations.
- Irregular pulse.
- Shortness of
breath, especially during physical activity or emotional
stress.
- Weakness, fatigue.
- Chest pain.
- Dizziness,
confusion.
- Lightheadedness or fainting (syncope).
Checking your pulse
Checking your pulse is important, because many people don't have symptoms of atrial
fibrillation. Ask your doctor how often you should check your heartbeat. If you have atrial fibrillation but have trouble feeling if your heart beat is irregular, you can buy a low-priced stethoscope to listen to your heart.
If you notice that your heartbeat doesn't have a regular
rhythm, talk to your doctor.
Paroxysmal atrial fibrillation
Atrial fibrillation is called paroxysmal if episodes last 7 days or less. The episodes may go away on their own or they go away after treatment.
Typically, over time, episodes of paroxysmal atrial fibrillation come on more often and last longer.
Persistent atrial fibrillation
Over time, episodes of
atrial fibrillation typically last longer and often don't go away on their own. If an episode lasts more than 7 days, this is called persistent atrial fibrillation. If an episode lasts for more than 12 months, it is called long-standing persistent atrial fibrillation.
Permanent atrial fibrillation
Atrial fibrillation is called permanent if you and your doctor have decided to not restore a normal heart rhythm. Although it is called permanent, you can change your mind later and try treatments to restore a normal heart rhythm.
What Increases Your Risk
A risk factor is anything that increases your chances of getting sick or having a problem. Risk factors for
atrial fibrillation include:
- Age older than 60.
- Being white and
male.
- Obesity.
- Sleep apnea.
- A family history
of atrial fibrillation.
- Certain other health problems can cause atrial fibrillation. For a list of these problems, see Cause.
Lifestyle choices
You may have certain habits that increase your risk for atrial fibrillation because they can cause wear and tear on your heart. These lifestyle choices include:
- Long-term, heavy alcohol use, or drinking a large amount of
alcohol at one time (binge drinking).
- Smoking.
When to Call a Doctor
Call 911 or other emergency services immediately if you:
- Have symptoms of a heart attack, such as chest pain or pressure, shortness of breath, and nausea.
- Have
symptoms of a stroke, such as sudden vision changes; trouble speaking; or numbness, tingling, weakness, or loss of movement in your face or an arm or a leg.
- Feel faint and have an
irregular heartbeat.
If you see someone pass out, call 911 or other emergency services immediately.
Call your doctor if you
have:
- An irregular heart rate.
- Heart palpitations.
- Periods of unexplained lightheadedness,
dizziness, or confusion.
- An episode of fainting or you come close
to fainting for no apparent reason.
- Shortness of breath that gets worse with exercise.
If you take a blood thinner
If you take blood-thinning medicine, such as an anticoagulant or aspirin, watch for signs of bleeding.
Call 911 or other emergency services immediately if you:
- You have a sudden, severe headache that is different from past headaches. (It may be a sign of bleeding in the brain.)
Call your doctor right away if you have any unusual bleeding, such as:
- Nosebleeds.
- Vaginal bleeding that is different (heavier, more frequent, at a different time of the month) than what you are used to.
- Bloody or black stools, or rectal bleeding.
- Bloody or pink urine.
Who to see
The following health professionals can
detect, diagnose and, in some cases, treat atrial fibrillation:
The following specialists can treat people who have severe symptoms:
Exams and Tests
An
electrocardiogram (EKG, ECG) is the best and simplest
way to find out whether you have
atrial fibrillation. It is usually done along
with a
medical history and physical exam.
If your doctor suspects
that you have atrial fibrillation that comes and goes, he or she may ask you to
use a device to record your heart rhythm for a while. This is
referred to by several names, including
ambulatory electrocardiogram, ambulatory EKG, Holter
monitoring, 24-hour EKG, and cardiac event monitoring. Your doctor might also use this device to check how well a medicine is working.
Other tests
Other tests your doctor may recommend include:
Treatment Overview
It's hard to say exactly what your treatment for atrial fibrillation will be, because it depends so much on your symptoms and your risk for other health problems.
Treatments are aimed at helping you feel better and preventing future problems, especially stroke and heart failure. There are three main types of treatment:
- Treatment to slow your heart rate.
- Treatment to control your heart rhythm.
- Treatment to prevent stroke.
Treatment to slow your heart rate
Rate-control medicines are used if your heart rate is too fast.
They usually do not return your heart to a
normal rhythm-in other words, your heartbeat will still be irregular. But these
medicines can keep your heart from beating at a dangerously fast rate. These medicines may also relieve symptoms.
Treatment to control your heart rhythm
Treatment to control your heart rhythm is done to try to stop atrial fibrillation and keep it from returning. It may also help your symptoms. Treatments include:
Treatment to prevent stroke
Atrial fibrillation is dangerous
because if the heartbeat isn't strong and steady, blood can
collect, or pool, in the atria. And pooled blood is more likely to form clots. Clots can travel through the bloodstream to the brain and cause a stroke.
Your doctor can help you know your risk of a stroke based on your age and health. This information can help you and your doctor decide how to lower your risk.
If you are at an average-to-high risk of having a stroke, your doctor may prescribe long-term use of an anticoagulant medicine to lower this risk.
If you are at low risk of having a stroke or you cannot take an anticoagulant, you may choose to take daily aspirin or to not take a blood thinning medicine.
For more information, see Medications.
An implanted device (such as Watchman) is a new way to try to lower the risk of stroke. The device may prevent blood clots from moving out of the heart and causing a stroke. The device is placed inside of the heart with a procedure that uses catheters in blood vessels. This device might be used in some people who cannot take an anticoagulant long-term.
For more information on this device, see Other Treatments.
Prevention
Do all you can to prevent heart disease, which is a cause of atrial fibrillation. Take steps toward a heart-healthy lifestyle.
- Manage your stress.
- Exercise regularly.
- Eat heart-healthy foods.
- Control your blood pressure.
- Lose extra weight.
- Don't smoke.
Living With Atrial Fibrillation
Many people are able to live full and
active lives with atrial fibrillation. Most people don't have to change their daily activities.
Because
atrial fibrillation is often the result of a heart
condition, making changes to improve your heart condition will usually improve
your overall health.
Make lifestyle changes
For more information, see:
Prevent other health problems
- If needed, take medicines that help lower your risk of heart disease. These include cholesterol and blood pressure medicine.
- Talk with your doctor or pharmacist before taking any new
medicine. Tell your doctor all of the medicines you take. Some prescription and nonprescription medicine can interact with your heart medicines. Some nonprescription medicines,
especially cold and herbal remedies, contain stimulants that can trigger atrial
fibrillation.
- Get a flu vaccine every year.
- Know the signs of
sleep apnea. Tell your doctor if you have symptoms such as snoring and feeling sleepy during the day. Many people with
atrial fibrillation also have this condition.
Take medicines safely
When you take a blood thinning medicine, you need to take extra steps to avoid bleeding problems, such as preventing falls and injuries. If you take warfarin, you also get regular blood tests and watch how much vitamin K you eat or drink.
- Warfarin: Taking Your Medicine Safely
- Blood Thinners Other Than Warfarin: Taking Them Safely
Medications
If you have atrial fibrillation, you will likely take a medicine to help prevent a
stroke. You may also take a medicine that slows
your heart rate or controls your heart rhythm.
Medicine to prevent a stroke
Anticoagulants
Anticoagulant medicines, also called blood thinners, are recommended for
most people with atrial fibrillation who are at average to high risk of
stroke.
Anticoagulant choices include:
- Warfarin (Coumadin).
- Anticoagulants other than warfarin.
- Apixaban (Eliquis)
- Dabigatran (Pradaxa)
- Edoxaban (Savaysa)
- Rivaroxaban (Xarelto)
For help deciding about an anticoagulant, see:
- Atrial Fibrillation: Should I Take an Anticoagulant to Prevent Stroke?
- Atrial Fibrillation: Which Anticoagulant Should I Take to Prevent Stroke?
Aspirin
If you are at low risk of having a stroke or cannot take anticoagulants, you may choose to take daily aspirin or to not take a blood thinning medicine.
Aspirin doesn't work as well as anticoagulant
medicines to prevent a stroke. But aspirin might be less likely to cause bleeding problems.
Medicine to slow your heart rate
Rate-control medicines are used if your heart rate is too fast. The medicine slows your heart rate. Your heart rate may not need to be very low. A heart rate of 110 beats per minute may be enough to help you.
These medicines
include:
Rate-control medicines may relieve symptoms caused by the fast heart rate. But these medicines may not relieve other symptoms caused by atrial fibrillation.
Medicine to control your heart rhythm
Rhythm-control medicines (also known as antiarrhythmics) help return the heart to its normal rhythm and keep
atrial fibrillation from returning. They may help relieve symptoms caused by an irregular heart rate.
Other Treatment
Electrical cardioversion
Electrical cardioversion uses a low-voltage electrical shock to return an irregular heartbeat to a normal rhythm.
- Atrial Fibrillation: Should I Try Electrical Cardioversion?
Catheter ablation
Catheter ablation is a minimally invasive procedure. It destroys the heart tissue that causes atrial fibrillation and that keeps atrial fibrillation going after it starts.
For help deciding whether catheter ablation is a good choice for you, see:
- Atrial Fibrillation: Should I Have Catheter Ablation?
AV node ablation is another type of catheter ablation. It does not stop atrial fibrillation but it can relieve symptoms.
Device to prevent stroke
An implanted device (such as Watchman) is a new way to try to lower the risk of stroke. Doctors call the device a left atrial appendage closure device. This means that the device closes a very small part of the left atrium (a chamber of the heart) where blood clots might form. The device may prevent these blood clots from moving out of the heart and causing a stroke.
The device is placed inside of the heart with a procedure that uses catheters in blood vessels. This procedure is available at a small number of hospitals. The device is not right for everyone. It might be used for a person who cannot take an anticoagulant long-term. Experts are not yet sure how well the device works to prevent a stroke. For some people, it may work as well as an anticoagulant. But there is a chance of harm from the procedure, including bleeding. You and your doctor can decide if the device is right for you.
Other Places To Get Help
Organizations
American Heart Association
www.heart.org
National Heart, Lung, and Blood Institute (U.S.)
www.nhlbi.nih.gov
References
Other Works Consulted
- Calkins H, et al. (2012). 2012 HRS/EHRA/ECAS expert consensus statement on catheter and surgical ablation of atrial fibrillation: Recommendations for patient selection, procedural techniques, patient management and follow-up, definitions, endpoints, and research trial design. A report of the Heart Rhythm Society (HRS) Task Force on Catheter and Surgical Ablation of Atrial Fibrillation. Heart Rhythm, 9(4): 632-696.e21.
- January CT, et al. (2014). 2014 AHA/ACC/HRS Guideline for the management of patients with atrial fibrillation: A report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines and the Heart Rhythm Society. Circulation, published online March 28, 2014. DOI: 10.1161/CIR.0000000000000041. Accessed April 18, 2014.
- Noelck N, et al. (2016). Effectiveness of left atrial appendage exclusion procedures to reduce the risk of stroke: A systematic review of the evidence. Circulation Cardiovascular Quality and Outcomes, 9(4): 395-405. DOI: 10.1161/CIRCOUTCOMES.115.002539. Accessed July 19, 2016.
- Roy D, et al. (2008). Rhythm control versus rate control for atrial fibrillation and heart failure. New England Journal of Medicine, 358(25): 2667-2677.
- Shea JB, Sears SF (2008). A patient's guide to living with atrial fibrillation. Circulation, 117(20): e340-e343.
- Sherman DG, et al. (2005). Occurrence and characteristics of stroke events in the atrial fibrillation follow-up investigation of sinus rhythm management (AFFIRM) study. Archives of Internal Medicine, 165(10): 1185-1191.
- Van Gelder IC, et al. (2010). Lenient versus strict rate control in patients with atrial fibrillation. New England Journal of Medicine, 362(15): 1363-1373.
- You JJ, et al. (2012). Antithrombotic therapy for atrial fibrillation: Antithrombotic therapy and prevention of thrombosis, 9th ed.-American College of Chest Physicians evidence-based clinical practice guidelines. Chest, 141(2, Suppl): e531S-e575S.
Credits
ByHealthwise Staff
Primary Medical ReviewerRakesh K. Pai, MD, FACC - Cardiology, Electrophysiology
E. Gregory Thompson, MD - Internal Medicine
Martin J. Gabica, MD - Family Medicine
Specialist Medical ReviewerJohn M. Miller, MD, FACC - Cardiology, Electrophysiology
Current as ofSeptember 21, 2016