Atrial Fibrillation
A detailed guide to atrial fibrillation symptoms, stroke risk, ECG diagnosis, anticoagulation, rhythm control and catheter ablation.
Atrial fibrillation is a common heart rhythm disorder in which the upper chambers of the heart show rapid and disorganised electrical activity. The pulse is often irregular. Some people feel pronounced palpitations, while others have few or no symptoms. Even without symptoms, atrial fibrillation requires assessment because it may increase the risk of stroke and heart failure.
Key Points
Management has several parallel goals: addressing risk factors, preventing stroke, controlling an excessively fast heart rate and reducing symptoms through a rhythm-control strategy when appropriate. The best combination differs between patients and may change over time.
Symptoms
- An irregular, rapid or forceful heartbeat
- Shortness of breath and reduced exercise capacity
- Fatigue, dizziness or chest discomfort
- A decline in daily performance or worsening heart-failure symptoms
- No noticeable symptoms in some patients
Causes and Risk Factors
Age, high blood pressure, heart failure, valve disease, diabetes, obesity, sleep apnoea and kidney disease can increase risk. Thyroid disease, acute illness, heavy alcohol intake and previous heart surgery may also trigger or contribute to atrial fibrillation. Treating modifiable factors can improve both general cardiovascular health and rhythm-control outcomes.
How Is It Diagnosed?
The rhythm must be documented, usually with a 12-lead ECG or a rhythm recording. Intermittent episodes may require a Holter monitor, a longer event recorder or information from a clinically validated device. Blood tests and echocardiography help identify contributing conditions and assess heart structure and function.
Why Does Stroke Risk Matter?
Blood may stagnate in the atria during atrial fibrillation and form a clot that can travel to the brain. The need for an anticoagulant is not determined only by the intensity of palpitations or whether the rhythm happens to be normal on a particular day. Age, previous stroke, heart failure, high blood pressure, diabetes and vascular disease are assessed together. Anticoagulant choice and dose must also account for kidney function, bleeding risk and other medicines.
Treatment Options
Rate-control medicines may prevent the heart from beating too quickly. Rhythm control can involve antiarrhythmic medication, electrical cardioversion or catheter ablation. Earlier rhythm control may be considered in selected patients, particularly when symptoms, rhythm burden or heart function justify it. Catheter ablation is not a substitute for stroke-risk assessment, and anticoagulation should never be stopped solely because symptoms improve.
Daily Life and Follow-up
Weight management, regular appropriate activity, limiting excess alcohol, treating sleep apnoea and controlling blood pressure and diabetes are important. Follow-up reviews symptoms, heart rate, rhythm burden, medicine safety and stroke risk. Patients taking anticoagulants should report unusual bleeding and discuss other medicines before starting them.
When to Seek Emergency Help
Frequently Asked Questions
Is atrial fibrillation always felt as palpitations?
No. It may be discovered incidentally. Lack of symptoms does not remove the need to assess stroke risk.
Is ablation suitable for everyone?
No. Symptoms, episode pattern, atrial size, other heart disease, previous treatment and patient preference are considered.
Can anticoagulation be stopped after ablation?
That decision is based mainly on the individual stroke-risk profile, not only on the apparent success of ablation.