What is Atrial Fibrillation and How Does It Affect the Heart
Atrial fibrillation, often called AFib or AF, is a heart rhythm disorder where the upper chambers of the heart (called atria) beat irregularly and too quickly. Instead of beating in a coordinated pattern, the atria quiver or fibrillate. This irregular rhythm can range from occasional episodes lasting minutes or hours to constant, persistent patterns that never resolve on their own.
Free Guide to Building Self-Discipline and Following Through →
The human heart normally beats 60 to 100 times per minute in a steady, coordinated rhythm. During atrial fibrillation, the atria may beat 100 to 175 times per minute or even faster. The lower chambers of the heart, called ventricles, respond irregularly to these signals, creating an unpredictable heartbeat. This irregular rhythm prevents the heart from pumping blood as efficiently as it should.
According to the Centers for Disease Control and Prevention, approximately 2.7 to 6.1 million Americans have atrial fibrillation. The condition becomes more common with age—about 9 percent of people aged 65 and older have AFib. It affects men more frequently than women and is more common in people who are white.
When blood doesn't pump efficiently through the heart, it can pool in the atria. This pooling increases the risk of blood clots forming. A blood clot can travel to the brain and cause a stroke. In fact, people with atrial fibrillation have a four to five times higher risk of stroke compared to people without the condition. This is why managing AFib is so important for overall health.
People with atrial fibrillation may experience various symptoms, though some people have no symptoms at all. Common symptoms include heart palpitations (feeling like the heart is racing or fluttering), shortness of breath, fatigue, dizziness, and chest discomfort. Some individuals discover they have AFib only during a routine medical examination or when seeking treatment for other health concerns.
Practical Takeaway: Understanding that atrial fibrillation is an irregular heart rhythm that reduces pumping efficiency helps explain why treatment focuses on both controlling heart rate and preventing blood clots. If you experience heart palpitations or shortness of breath, reporting these symptoms to a healthcare provider allows for proper diagnosis through an electrocardiogram (EKG) or other heart monitoring tools.
Medication Options for Managing Atrial Fibrillation
Medications form the foundation of treatment for most people with atrial fibrillation. Different drug classes work in different ways to either control the heart rate, restore normal rhythm, or prevent blood clots. A healthcare provider will recommend specific medications based on individual factors including age, kidney function, other medical conditions, and symptom severity.
Learn How Spouse Benefits on SSDI Records Work →
Beta-blockers are among the most commonly prescribed medications for AFib. These drugs slow the heart rate by blocking the effects of adrenaline on the heart. Common beta-blockers used for AFib include metoprolol, atenolol, and carvedilol. They reduce how fast the ventricles beat during atrial fibrillation, which can reduce symptoms and improve heart function. Beta-blockers may also lower blood pressure, which provides additional heart protection.
Calcium channel blockers work similarly to beta-blockers by slowing the heart rate, but they work through a different mechanism in the heart. Diltiazem and verapamil are the primary calcium channel blockers used for AFib management. These medications may be preferred for certain patients, particularly those who cannot tolerate beta-blockers or who have specific medical conditions like asthma or chronic obstructive pulmonary disease.
Antiarrhythmic drugs work to restore and maintain normal heart rhythm. These include medications like amiodarone, flecainide, sotalol, and dofetilide. Amiodarone is particularly effective but carries potential side effects affecting the lungs, liver, and thyroid, so it requires regular monitoring. Flecainide and sotalol may be used for people with less structural heart disease. These rhythm-controlling medications may reduce the frequency and duration of AFib episodes.
Anticoagulant medications, commonly called blood thinners, prevent blood clots from forming. Warfarin has been used for decades and requires regular blood tests to monitor its effect. Newer anticoagulants called direct oral anticoagulants (DOACs) include apixaban, dabigatran, edoxaban, and rivaroxaban. These newer medications don't require regular blood monitoring and have fewer dietary interactions than warfarin. Studies show that DOACs are as effective as warfarin for stroke prevention and may have lower bleeding risks in certain populations.
Digoxin is an older medication still used for some AFib patients, particularly those with heart failure. It slows the heart rate and strengthens heart contractions. Rate-control medications may be combined to achieve optimal heart rate control. For example, a beta-blocker might be paired with a calcium channel blocker or digoxin if the heart rate remains too high on a single medication.
Practical Takeaway: Medications for atrial fibrillation typically serve one or more purposes: controlling heart rate, restoring normal rhythm, or preventing blood clots. Most people with AFib take at least two medications—a rate-control drug and an anticoagulant. Understanding what each medication does helps explain why your healthcare provider prescribes the specific combination they recommend.
Cardiac Procedures and Interventions for Atrial Fibrillation
When medications don't control atrial fibrillation adequately or cause unacceptable side effects, various cardiac procedures may be considered. These interventions aim to either restore normal heart rhythm or provide better symptom control. The choice of procedure depends on AFib type, underlying heart structure, symptom severity, and individual patient factors.
Get Your Free California DMV Hardship Registration Guide →
Catheter ablation is the most common procedure for AFib. During this minimally invasive procedure, a cardiologist threads a thin, flexible tube called a catheter through a vein to the heart. Once in place, the catheter delivers energy (usually radiofrequency energy, but sometimes cryotherapy or other sources) to small areas of heart tissue that are triggering the irregular rhythm. This energy destroys the problematic tissue, preventing abnormal electrical signals. Success rates for catheter ablation vary from 60 to 90 percent depending on AFib type and patient characteristics. Paroxysmal AFib (episodes that come and go) has higher success rates than persistent AFib (continuous or recurring episodes lasting more than one week).
Some people experience improvement after one ablation procedure, while others may require repeat procedures. About 20 to 30 percent of people need a second ablation within five years. The procedure carries small risks including bleeding, infection, and in rare cases, damage to surrounding heart structures. Most people can return to normal activities within a few days to a week.
Surgical maze procedures, also called Cox-maze procedures, may be performed during open-heart surgery if a person is already undergoing surgery for another reason, such as valve replacement. The surgeon creates a pattern of small scars in the atria to interrupt abnormal electrical signals. This procedure has high success rates but is rarely performed as a standalone AFib treatment because it requires open-heart surgery.
Atrioventricular (AV) node ablation is a procedure for people whose AFib cannot be controlled by other treatments. During this procedure, the cardiologist destroys the tissue that conducts electrical signals between the atria and ventricles. This stops irregular signals from reaching the ventricles, allowing a pacemaker to control the heart rate. While effective at controlling heart rate, this procedure doesn't restore normal rhythm and requires pacemaker placement. The person will be pacemaker-dependent for life.
Left atrial appendage (LAA) closure is a newer procedure for people who cannot tolerate blood thinners. The LAA is a small pouch in the left atrium where blood clots commonly form during AFib. A cardiologist threads a device through a vein to close off this appendage, reducing stroke risk. This procedure may be performed as an alternative to long-term anticoagulation in selected patients.
Practical Takeaway: Cardiac procedures for AFib aim to either eliminate the source of irregular rhythms or manage symptoms when medications aren't sufficient. Catheter ablation represents the most commonly performed intervention with reasonable success rates and relatively quick recovery. Discussing which procedures might be appropriate