Reviewed by Dr Pipin Kojodjojo, consultant cardiologist and electrophysiologist, Asian Heart & Vascular Centre (AHVC).
A smartwatch alert for possible atrial fibrillation (AF or AFib) is not something to panic about, but it should be checked. Save the recording, note any symptoms, and arrange a clinical review. Seek emergency help immediately for chest pain, fainting, severe breathlessness, or signs of stroke.
My smartwatch says I may have AFib. What should I do?
Smartwatches can identify an irregular pulse or record a single-lead electrocardiogram (ECG). These features are useful for detecting possible AF, including episodes that cause no symptoms. However, an automated notification can be wrong and must be interpreted in clinical context.
1. Save or export the ECG recording or alert. Bring the PDF or screenshot to your appointment.
2. Write down the date, time, duration, and symptoms such as palpitations, breathlessness, dizziness, or fatigue.
3. Arrange a medical review, especially if alerts recur or you have stroke-risk factors such as high blood pressure, diabetes, or a previous stroke.
4. Do not start, stop, or change heart or blood-thinning medication based only on a watch alert.
A clinician may confirm AF from a diagnostic-quality ECG tracing or arrange a 12-lead ECG or longer heart-rhythm monitoring. If the rhythm has returned to normal before the appointment, a Holter monitor, patch monitor, or implantable loop recorder may be needed.
When is an AFib alert an emergency?
Call emergency services if an irregular rhythm occurs with severe chest pain, fainting, severe breathlessness, or stroke symptoms such as facial drooping, arm weakness, speech difficulty, sudden loss of vision, or a sudden severe headache. A watch should never delay urgent assessment.
What is atrial fibrillation?
Atrial fibrillation is the most common sustained heart-rhythm disorder. During AF, disorganised electrical signals cause the heart’s upper chambers, the atria, to quiver rather than contract in a coordinated way. The pulse becomes irregular and may also be fast.
Some people feel a racing or fluttering heartbeat. Others mainly notice tiredness, breathlessness, dizziness, or reduced exercise capacity. AF can also be silent, which is why wearable devices sometimes provide the first clue.
Why does AF matter?
AF matters because it can affect quality of life, weaken the heart when rates remain uncontrolled, and increase stroke risk. 40% of the world’s strokes are caused by AF, Stroke risk varies greatly between patients and is assessed using clinical factors such as age, high blood pressure, diabetes, heart failure, vascular disease, and previous stroke.
Not every person with AF needs to take an anticoagulant (blood thinner). When anticoagulation is recommended, the decision is based on the person’s overall stroke and bleeding risks, not simply on symptoms, smartwatch alerts, or whether an ablation has restored normal rhythm.
How is AF diagnosed in Singapore?
Diagnosis requires an ECG recording that shows AF and is reviewed by a qualified clinician. A 12-lead ECG is commonly used because it provides a detailed view of the heart’s electrical activity. If episodes come and go, longer monitoring increases the chance of capturing them.
· 12-lead ECG: a short, detailed recording performed in a clinic or hospital.
· Holter or patch monitor: continuous or intermittent recording over days or weeks.
· Implantable loop recorder: long-term monitoring for selected patients with infrequent symptoms, unexplained fainting, or suspected silent AF, which can monitor for 3-4.5 years
· Echocardiogram and blood tests: used after diagnosis to assess heart structure and possible contributing conditions.
What causes AF?
AF usually develops through a combination of age, genetics, heart conditions, and modifiable risk factors. Common contributors include high blood pressure, obesity, sleep apnoea, diabetes, thyroid disease, valve disease, heavy alcohol intake, and other cardiovascular disease.
Managing these factors is part of AF treatment. Blood-pressure control, sustainable weight management, treatment of sleep apnoea, regular exercise, and reducing alcohol can reduce AF attacks and improve treatment outcomes.
How is atrial fibrillation treated?
Treatment is personalised and usually combines three goals:
· Reduce stroke risk. Anticoagulation is recommended for patients whose clinical stroke risk justifies it.
· Restore or maintain normal rhythm. Options include antiarrhythmic medication, electrical cardioversion, and catheter ablation for suitable patients. If normal rhythm cannot be restored, then medications can be used to maintain a reasonable heart rhythm
· Manage co-morbidities such as hypertension, diabetes, etc.
Current guidelines support discussing rhythm control early after diagnosis. Catheter ablation may be considered after medication is ineffective or not tolerated, and it can also be a first-line option for selected patients after shared decision-making.
When should I see an electrophysiologist?
An electrophysiologist is a cardiologist with specialist training in heart-rhythm disorders. Consider an assessment if AF is suspected but difficult to capture, symptoms continue despite treatment, medication causes side effects, or you want to discuss catheter ablation.
At AHVC, the heart-rhythm team assesses smartwatch recordings, confirms the diagnosis, evaluates stroke risk, and discusses treatment options based on the patient’s symptoms, AF pattern, health conditions, and preferences.
Frequently asked questions
Can an Apple Watch or Fitbit diagnose AFib?
A wearable can identify a possible irregular rhythm and some devices can record a useful single-lead ECG. A clinician must review the evidence and may request further testing before confirming AF and making treatment decisions.
What if my smartwatch alert disappears?
AF can come and go and so alerts can also come and goSave the recording and arrange a review even if you feel well again, particularly when alerts recur or you have stroke-risk factors.
Does every smartwatch AFib alert mean I need blood thinners?
No. Anticoagulation decisions require confirmed AF and an individual assessment of stroke and bleeding risk.
Can AF be cured?
AF can be controlled effectively, and ablation can substantially reduce or eliminate episodes in suitable patients. Recurrence remains possible, so ongoing risk-factor management and follow-up remain important.
Can I exercise with AF?
Many people with stable, treated AF can exercise safely. New symptoms, fainting, chest pain, or marked breathlessness should be assessed before continuing.