Quick answer: Cardiac ablation (catheter ablation) is a keyhole procedure used to treat abnormal heart rhythms. Thin tubes called catheters are guided through a blood vessel to the heart, where heat or cold energy is used to destroy the tiny areas of heart tissue causing the abnormal rhythm. In Singapore it is usually performed by a cardiologist with special training in heart rhythm (an electrophysiologist), often at centres such as the National Heart Centre Singapore. Most people go home the same day or the next day. After the procedure, seek urgent care for bleeding or swelling at the puncture site, a cold or painful limb, chest pain, breathlessness, or fainting.
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If you have a heart rhythm problem (arrhythmia) that troubles you despite medicines, your specialist may suggest cardiac ablation. It is one of the more common procedures used to correct faulty electrical signalling in the heart, and for some rhythm disorders it can offer a lasting solution. This guide explains what the procedure involves, how to prepare, what recovery is like, and when to seek help afterwards. It is general information and does not replace advice from your own cardiologist.
What cardiac ablation is
Cardiac ablation is a procedure to treat abnormal heart rhythms by carefully destroying (ablating) the tiny areas of heart tissue that trigger or sustain the abnormal rhythm. Your heart beats in a coordinated way because of electrical signals that travel through it. When these signals follow a faulty pathway or arise from the wrong place, the heart can beat too fast, too slowly, or irregularly. During ablation, thin, flexible tubes called catheters are guided through a blood vessel into the heart. The specialist then uses heat (radiofrequency energy) or cold (cryoablation) delivered through the catheter tip to create small, precise scars. These scars block the faulty electrical circuit so that normal rhythm can be restored or maintained.
What it treats
Ablation is used for a range of rhythm problems. These include supraventricular tachycardia (SVT), atrial fibrillation and atrial flutter, and certain other arrhythmias arising from the upper or lower chambers of the heart. It may be offered when medicines are not controlling the rhythm well, when medicines cause side effects that are hard to tolerate, or as a preferred first option for some rhythm disorders where ablation is known to work well. Your cardiologist or electrophysiologist will consider the type of arrhythmia, your symptoms, and your overall health before recommending it.
How to prepare
Your care team will give you specific instructions, which usually include fasting for a period before the procedure. You will be advised about your medicines, including whether to continue, adjust, or pause blood thinners and rhythm medicines; never change these yourself without guidance. Before the procedure you may have tests such as an ECG, blood tests, and heart imaging to map your condition and check that you are ready. Tell your team about all your medicines, allergies, and any chance of pregnancy. Arrange for someone to accompany you home afterwards.
What happens during the procedure
Ablation is usually done under sedation or general anaesthetic so you are comfortable and still. The specialist inserts the catheters through a blood vessel, most often at the groin and sometimes the wrist, and guides them to the heart using imaging. First, the team maps the heart’s electrical activity to pinpoint exactly where the abnormal signals come from. Then they deliver heat or cold energy to those areas to ablate the problem tissue. You may feel little or nothing during this. The procedure can take a few hours depending on the type of arrhythmia and how complex the electrical pathways are.
Recovery
After the catheters are removed, pressure is applied to the access site and you will need to lie still for a period so the blood vessel can seal and to reduce the risk of bleeding. The team will monitor your heart rhythm and check the puncture site. Many people are able to go home the same day or the next day. You will be told how to care for the access site, to avoid heavy lifting and strenuous activity for a short while, and how to return gradually to your usual routine. Mild bruising or tenderness at the site is common and usually settles.
Success and expectations
Ablation can cure or greatly reduce symptoms for some arrhythmias, particularly conditions such as SVT. For other conditions, including atrial fibrillation, the picture is more variable: some people need more than one procedure to achieve a good result, and some continue with medicines afterwards. Your specialist will explain what is realistic for your specific rhythm problem, including the chance of the arrhythmia returning and whether ongoing treatment may be needed. Understanding these expectations before the procedure helps you weigh the benefits against the risks.
Risks and complications
Cardiac ablation is generally considered safe, but as with any procedure there are possible risks. The most common is bleeding or bruising at the access site. Less commonly, there can be damage to the heart or nearby structures, new or continuing rhythm problems, or the formation of blood clots. The specific risks depend on the type of ablation and your own health. Your team will explain the relevant risks to you and weigh the likely benefits against them before you agree to go ahead.
Living well afterwards and follow-up
After ablation you will have follow-up with your cardiologist to check how well the rhythm has settled, often with an ECG or heart monitoring. Take medicines exactly as advised, and do not stop blood thinners without your doctor’s guidance, as this may be important for reducing your risk of stroke. Managing risk factors supports your heart rhythm and general heart health: this can include controlling blood pressure, keeping to a healthy weight, staying active as advised, limiting alcohol, and not smoking. Attend your follow-up appointments so your progress can be reviewed.
When to seek help after
Contact your care team promptly if you notice bleeding, swelling, or a growing lump at the access site, or increasing pain or numbness there. Seek urgent medical attention for a cold, pale, or painful limb, for chest pain, for breathlessness, or if you feel faint or collapse. In Singapore, call 995 for an ambulance if you have severe chest pain, serious breathlessness, or collapse. If your original rhythm symptoms return or new palpitations develop, let your specialist know so they can advise you.
Common questions
Is cardiac ablation painful?
You are usually given sedation or a general anaesthetic, so you should feel little or no pain during the procedure. Afterwards, some tenderness or bruising at the access site is normal and generally settles with time.
How long will I be in hospital?
Many people go home the same day or the following day. Your specialist will decide based on the type of ablation, how you recover, and your overall health.
Will I still need to take medicines?
It depends on your arrhythmia. Some people can stop certain medicines after a successful ablation, while others continue with rhythm medicines or blood thinners. Always follow your doctor’s advice rather than stopping on your own.
Can the arrhythmia come back?
For some conditions the abnormal rhythm can return, and a second procedure is sometimes needed, particularly with atrial fibrillation. Your specialist will explain how likely this is for your situation.
When can I return to work and exercise?
Most people ease back into normal activity gradually, avoiding heavy lifting and strenuous exertion for a short period. Your care team will give you guidance tailored to your recovery and your job.
Related guides
- Heart arrhythmias
- Supraventricular tachycardia (SVT)
- Palpitations & atrial fibrillation
- Pacemaker
- ECG test
Sources
- National Heart Centre Singapore
- Singapore Heart Foundation
- HealthHub
- Heart Rhythm Society
Important: This guide is general information and does not replace personalised advice from your cardiologist or electrophysiologist. Never ignore or delay seeking medical advice because of something you have read here. After cardiac ablation, call 995 or go to your nearest emergency department for chest pain, severe breathlessness, or collapse.