Heart & Circulation

Atrial Fibrillation: Symptoms, Risks, and Treatment

An irregular heartbeat that increases risk of stroke and heart failure — how it's diagnosed and treated.

Updated: 5 min read

Atrial Fibrillation: Symptoms, Risks, and Treatment

Atrial fibrillation (AF or AFib) is the most common sustained heart rhythm disorder, affecting more than 33 million people worldwide. It occurs when the upper chambers of the heart (atria) fire electrical signals chaotically, producing an irregular and often rapid pulse. This disrupts efficient pumping and increases the risk of stroke, heart failure, and other complications.

Symptoms

Many people notice symptoms; some have none and are diagnosed incidentally.

  • Palpitations (fluttering, racing, or irregular heartbeat)
  • Shortness of breath, especially on exertion
  • Fatigue or weakness
  • Dizziness or light-headedness
  • Reduced ability to exercise
  • Occasional chest discomfort

Types of AFib:

  • Paroxysmal: Episodes come and go, usually resolving within 7 days
  • Persistent: Lasts more than 7 days and doesn’t resolve without treatment
  • Long-standing persistent: Lasts more than 12 months
  • Permanent: Normal rhythm cannot be restored; rate control is the focus

Why AFib Is Serious

Stroke risk: When the atria fibrillate, blood pools and can clot. A clot that travels to the brain causes a stroke. People with AFib are 4–5 times more likely to have a stroke than those with a normal heart rhythm.

Heart failure: Uncontrolled AFib forces the heart to work harder over time, potentially weakening the heart muscle.

Risks and Risk Factors

  • High blood pressure (the most common underlying cause)
  • Age over 65
  • Obesity and obstructive sleep apnoea
  • Existing heart disease (coronary artery disease, heart failure, valve disease)
  • Excessive alcohol use
  • Hyperthyroidism and diabetes

Diagnosis

AFib is diagnosed by an ECG (electrocardiogram) that records the irregular rhythm. A Holter monitor or wearable patch may be used to detect paroxysmal AFib that doesn’t show up on a standard ECG.

Treatment Options

Rate Control

Slowing the heart rate to reduce strain, even if the rhythm stays irregular.

  • Beta blockers (metoprolol, bisoprolol, atenolol)
  • Calcium channel blockers (diltiazem, verapamil)
  • Digoxin (particularly in heart failure)

Rhythm Control

Trying to restore and maintain normal sinus rhythm.

  • Antiarrhythmic drugs (flecainide, amiodarone, sotalol, dronedarone)
  • Electrical cardioversion (a controlled electric shock to reset rhythm)
  • Catheter ablation (isolating abnormal electrical signals in the atria — increasingly used for paroxysmal and persistent AFib)

Stroke Prevention (Anticoagulation)

Blood thinners to prevent clot formation in the atria.

  • Direct oral anticoagulants (DOACs): apixaban (Eliquis), rivaroxaban (Xarelto), dabigatran (Pradaxa)
  • Warfarin (Coumadin): older option requiring regular INR monitoring
  • Risk is assessed using the CHA₂DS₂-VASc score; most people with AFib benefit from anticoagulation

Lifestyle and Monitoring

  • Treat underlying causes: control blood pressure, manage sleep apnoea, reduce alcohol, lose weight if overweight
  • Limit caffeine if it triggers episodes
  • Regular follow-up with ECG or Holter monitoring
  • Wearable devices (smartwatches with ECG) can detect AFib episodes between appointments

When to Seek Urgent Help

  • New or sudden onset of irregular heartbeat with dizziness, chest pain, or shortness of breath → seek same-day assessment or call emergency services
  • Sudden weakness, face drooping, or speech difficulty (possible stroke) → call emergency services immediately
  • Collapse or loss of consciousness → call emergency services immediately

FAQ

Q: What is AFib? Atrial fibrillation is the most common heart rhythm disorder — chaotic electrical activity in the upper chambers causes an irregular pulse and raises stroke risk significantly.

Q: Why does AFib increase stroke risk? Blood pools in the chaotically beating atria, forming clots. If a clot travels to the brain, it causes a stroke. Anticoagulants reduce this risk substantially.

Q: Can lifestyle changes help? Yes. Weight loss, treating sleep apnoea, reducing alcohol, and controlling blood pressure can reduce AFib burden and sometimes prevent progression.

Q: Can AFib be cured? Catheter ablation restores normal rhythm in many people, particularly with paroxysmal AFib. It’s not a guaranteed cure and episodes can recur.

Further Reading

Note: Educational only; not a substitute for professional medical advice.