Cardiac ablation (Catheter ablation for cardiac arrhythmia)

What is cardiac ablation?

Cardiac ablation (catheter ablation) is a procedure to treat an abnormal heart rhythm (arrhythmia). The cardiologist passes thin, flexible tubes called catheters through a vein, usually in the groin, up to the heart. Using X-ray and electrical mapping, they find the small areas of heart tissue that are causing or carrying the abnormal rhythm and treat them with heat (radiofrequency) or freezing (cryoablation) so they can no longer trigger or sustain it.

It is used for several rhythm problems, including atrial fibrillation, atrial flutter, supraventricular tachycardia (SVT) and, in specialist centres, ventricular tachycardia. The aim is to reduce or stop the abnormal rhythm and ease symptoms such as palpitations, breathlessness and tiredness.

How well ablation works depends a lot on the rhythm. Some, such as SVT and typical atrial flutter, have high success from a single procedure. Atrial fibrillation often needs a settling-in period of about three months, and more than one procedure may be needed, especially for long-standing AF.

Ablation treats the rhythm; it does not treat the underlying heart disease and does not remove the need to consider stroke-prevention medicines in atrial fibrillation. A clear diagnosis of the rhythm, ideally captured on a tracing, should guide the decision.

Types, options & approaches

There may be different ways to do this. The right approach depends on the clinical question and your circumstances.

Ablation vs rhythm medicines (for atrial fibrillation)

Ablation and medicines are not either/or; many people use both. Your cardiologist will weigh your rhythm type, symptoms and preferences.

Preparing for your procedure

• Talk through which rhythm is being treated and what success would realistically look like for that rhythm.
• Discuss your blood-thinning medicine carefully; for AF ablation it is often continued around the procedure on advice.
• Tell the team about all other medicines and any allergies, including to contrast dye.
• You may be asked to stop certain rhythm medicines beforehand, and not to eat for a few hours.
• Arrange a lift home and someone to stay with you, especially if you have sedation or a general anaesthetic.
• Plan light duties for about a week and avoid heavy lifting that could disturb the groin site.
• Ask whether a scan of the heart or an echocardiogram is needed before the procedure.
• Understand the 'blanking period': extra palpitations in the first three months after AF ablation can be normal.

What happens

Ablation is done in a catheter lab. You will have local anaesthetic at the groin and usually sedation; some procedures, especially complex AF or VT ablation, are done under general anaesthetic.

The cardiologist passes catheters through a vein in the groin (sometimes also an artery) up to the heart. They map the heart's electrical activity to find the source of the abnormal rhythm. Sometimes they deliberately trigger the rhythm to locate it precisely. They then deliver heat or freezing energy to the target areas to stop them carrying the abnormal rhythm.

For AF, this usually means isolating the areas around the pulmonary veins, which requires crossing from the right to the left side of the heart through the wall between the upper chambers. Depending on the rhythm, the procedure can take from about an hour to several hours.

Afterwards the catheters are removed and pressure is applied to the groin to prevent bleeding. You will rest flat for a few hours and most people go home the same day or the next morning.

Is this procedure right for me?

A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.

Before you decide

Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.

Comfort, sedation or contrast choices

If local anaesthetic, sedation, contrast or pain relief is used, ask what is planned, why, and what it means afterwards.

The most common problems relate to the groin puncture and to bruising or bleeding. More serious but uncommon risks include fluid around the heart and, rarely, stroke. Reported figures from NHS sources for some AF ablations include around 1% for groin bleeding or vascular damage, around 1% for fluid around the heart, around 0.1% for stroke and under 0.1% for heart attack, but your own risk depends on the rhythm treated and your health. Ask your cardiologist about the specific risks of your type of ablation.

Published figures to discuss

Success and complication rates vary widely by the rhythm treated, how long it has been present, the size and health of the heart, and the operator's and centre's experience. The figures below are cautious examples from NHS sources for some atrial fibrillation ablations and are not a personal prediction.

These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.

What happens afterwards

Most people are home within a day and back to light activity within a few days, but the groin site needs care and, for atrial fibrillation, the true effect is only clear after a settling-in period of about three months.

• Bruising and tenderness at the groin that fades over a week or two
• Occasional palpitations or skipped beats in the first weeks, particularly after AF ablation
• Mild chest discomfort from inflammation that settles
• Tiredness for a few days after the procedure

Aftercare

• Rest and avoid heavy lifting, straining and vigorous exercise for several days to protect the groin.
• Keep the groin site clean and dry and watch for swelling, bleeding or a painful lump.
• Take your blood thinners and rhythm medicines exactly as advised, and do not stop them on your own.
• Do not drive for at least 2 days (longer for HGV/bus licences) and as your team advises.
• Drink enough fluids and build activity back up gradually.
• Keep a note of any palpitations to discuss at follow-up, but expect some during the settling period.
• Attend follow-up so your rhythm and any monitoring can be reviewed.

• Lift home arranged and someone to stay overnight
• Loose clothing that does not press on the groin
• Blood thinners and rhythm medicines organised as advised
• Time off planned (often about a week) and driving paused
• Help arranged for lifting and chores for a few days
• A way to note palpitations for your follow-up
• Clinic's contact number saved for groin or rhythm worries

Scars and how they heal

There is no surgical scar on the chest. The catheters go in through small punctures in the groin, which usually heal as tiny marks. Bruising around the groin is common and settles over a week or two.

⚠ Get urgent help if…

• Sudden severe chest pain or pain that spreads to the arm or jaw
• New breathlessness, fainting or a very fast or irregular pulse that does not settle
• Signs of stroke: face drooping, arm weakness or slurred speech — call 999
• A swelling, painful lump, fresh bleeding or coldness/numbness in the leg at the groin site
• A high temperature or feeling generally unwell
• Severe or worsening chest discomfort when breathing in (possible pericarditis)
• Difficulty or pain on swallowing in the weeks after AF ablation

Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.

General guidance — it doesn't replace the specific advice your surgeon gives you.

Results & realistic expectations

A good result is fewer or no episodes of the abnormal rhythm and an improvement in symptoms. For SVT and typical atrial flutter, a single procedure cures many people. For atrial fibrillation, success is judged after the three-month settling period, and some people, particularly with long-standing AF, need a second procedure to get the best result; published series suggest the chance of staying free of AF improves when more than one procedure is allowed for.

Ablation treats the rhythm, not the underlying heart condition. In atrial fibrillation it does not automatically remove the need for stroke-prevention blood thinners, which are decided separately based on your stroke risk. A normal rhythm after ablation does not guarantee the arrhythmia will never return.

Results vary by rhythm. SVT and typical flutter ablations are often durable and long-lasting. Atrial fibrillation can come back over months or years, particularly if it was persistent, if the heart's upper chambers are enlarged, or if risk factors such as high blood pressure, sleep apnoea, alcohol and weight are not addressed. Treating these factors helps the result last. Some people choose a repeat ablation if symptoms return.

Related tests, treatments or support

Ablation is often combined with rhythm and stroke-prevention medicines and with treating risk factors such as blood pressure, weight, alcohol and sleep apnoea. AV node ablation is paired with a pacemaker. VT ablation is often done in people who also have an ICD. Your cardiologist will explain how these pieces fit together for your rhythm.

Follow-up & long-term care

You will usually be reviewed weeks to months after the procedure, with heart-rhythm monitoring to check the effect, especially for atrial fibrillation. Decisions about continuing or stopping rhythm medicines, and whether stroke-prevention blood thinners are still needed, are made at these reviews. Report groin problems, fever or troublesome symptoms without waiting.

• Address risk factors (blood pressure, weight, alcohol, sleep apnoea) to help the result last.
• Continue stroke-prevention blood thinners if advised, based on your stroke risk, not just on symptoms.
• Attend rhythm-monitoring follow-up so the effect can be judged after the settling period.
• Discuss a repeat procedure if symptoms return, particularly with persistent atrial fibrillation.
• If you have AV node ablation, attend pacemaker checks as that device controls your rate.

Repeat, follow-on and what comes next

• Atrial fibrillation can recur and a second procedure is often planned for, especially if persistent.
• The first three months after AF ablation is a settling period and is not used to judge success.
• SVT and typical flutter are often cured in one procedure, but occasionally recur and can be re-treated.
• AV node ablation is permanent and commits you to lifelong pacemaker dependence.

Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.

What good aftercare looks like

• Clear groin-care instructions and a named contact for bleeding or rhythm problems.
• A plan for blood thinners and rhythm medicines, with no unsupervised stopping.
• Explanation of the settling period and rhythm monitoring before judging success.
• A review timed after the settling period to decide on medicines and any repeat procedure.
• Clear driving advice for your licence and rhythm, naming the right authority to contact (the DVLA in England, Scotland and Wales; the DVA in Northern Ireland).

What affects the cost

Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:

• The type of ablation and how complex the rhythm is (a short SVT ablation differs greatly from complex AF or VT ablation)
• The cardiologist's (electrophysiologist's) fee and the catheter-lab and facility fees
• Whether sedation or a general anaesthetic and an anaesthetist are used
• Mapping technology, catheters and any cryoballoon used
• Length of stay (day case versus overnight)
• Imaging and tests before and after, such as echocardiogram and rhythm monitoring
• Follow-up reviews and the chance of a repeat procedure, especially for persistent AF

• The cardiologist's fee and the catheter-lab/facility fee
• Sedation or anaesthetist fees
• Equipment such as mapping catheters or a cryoballoon
• Overnight stay if needed
• Pre-procedure tests and post-procedure rhythm monitoring
• Follow-up reviews and the likely cost of a repeat procedure if needed
• What happens, and what is charged, if a complication occurs; and the cancellation policy

On the NHS? Cardiac ablation is available on the NHS when criteria are met, such as troublesome atrial fibrillation, SVT or flutter; private care is generally chosen for speed or choice of consultant.

You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.

Consent traps and marketing red flags

These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.

Choosing a specialist safely

• Check the surgeon is on the GMC Specialist Register for this area.
• Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
• You're entitled to time to consider and to have your questions answered before you agree — the surgeon who looks after you should explain it, not a salesperson.
• Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
• You're entitled to your total cost in writing — including any follow-up — before you decide.

How Vuemedics verifies every consultant →

Take this to your consultation. A good surgeon will welcome every one of these.

• Exactly which rhythm are you treating, and how was it confirmed?
• What is a realistic chance of success for my rhythm, and might I need more than one procedure?
• What are my personal risks, including bleeding, fluid around the heart and stroke?
• Will I still need rhythm medicines or stroke-prevention blood thinners afterwards?
• Will the procedure be under sedation or general anaesthetic, and why?
• What should I expect during the 3-month settling period, and when will we judge the result?
• Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
• Will you be the surgeon who carries out my procedure, and who looks after me afterwards?
• What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
• What does a realistic result look like — and what can this procedure not achieve?
• What are my options, including waiting, doing nothing for now, or choosing a different approach?
• Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
• What is the total cost in writing, including any follow-ups, and how much time do I have to decide?

Find a verified surgeon for cardiac ablation

Every consultant is GMC-checked and independently reviewed. Search by postcode and distance, or switch to a map. Ordered by rating, relevance and recency — never by who pays.

How we made this page

Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →

Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.

Sources & standards: NHS (Guy's and St Thomas') — Cardiac ablation for an irregular heart rhythm NHS England — Catheter ablation for atrial fibrillation (commissioning policy) British Heart Foundation — Catheter ablation NICE — Atrial fibrillation: diagnosis and management (NG196) Arrhythmia Alliance — Heart rhythm information Long-term outcomes of catheter ablation of atrial fibrillation (review) — PMC DVLA — Assessing fitness to drive (medical guidance) DVA Northern Ireland — Telling DVA about a driver medical condition

Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.

Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.