Catheter ablation for arrhythmia
A catheter-based procedure that uses heat or freezing to treat the small area of heart tissue causing an abnormal heart rhythm.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Ablation targets the heart tissue causing an abnormal rhythm, using heat or freezing delivered through catheters from the groin.
- Success depends heavily on the rhythm: some (like many SVTs) are often cured in one go, while atrial fibrillation often needs more than one procedure and is about symptom control.
- It is generally low-risk, but serious complications (such as fluid around the heart, or stroke) are possible and need respect.
- Driving rules apply afterwards — usually a short break for an ordinary licence, longer for lorry/bus drivers and for ablation of dangerous fast rhythms.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Can reduce or stop episodes of an abnormal heart rhythm and ease symptoms like palpitations, breathlessness and tiredness
People whose symptoms are mild or well controlled on medicines, where the balance of benefit and risk may not favour ablation.
You lie flat while the groin puncture site is watched for bleeding, then gradually sit up and move about. Most people go home the same day or after one...
A clear explanation that results are judged after a settling period of around 8–10 weeks.
You lie flat while the groin puncture site is watched for bleeding, then gradually sit up and move about. Most...
Take it easy and avoid heavy lifting and straining. The groin may be bruised and tender. Many people return to...
Palpitations, skipped beats or short runs of the old rhythm are common while the heart heals, and do not...
This 'settling' period passes and it becomes clearer whether the rhythm is controlled. Your team will review you...
What is catheter ablation for arrhythmia?
Catheter ablation is a way of treating an abnormal heart rhythm (arrhythmia) by targeting the small area of heart tissue that is causing it. Thin tubes (catheters) are passed in through a vein, usually in the groin, and guided to the heart. It is a procedure, not open-heart surgery.
The tip of a catheter then makes tiny, carefully placed marks in the tissue — using heat (radiofrequency) or freezing (cryoablation) — to block the faulty electrical signals. Newer energy types, such as pulsed field ablation, are also used in some centres. Before treating, the team often does an electrical 'map' of the heart to find exactly where the problem is.
Ablation is used for several rhythm problems, including atrial fibrillation (AF), atrial flutter, fast rhythms from extra electrical pathways (SVT), and certain dangerous fast rhythms from the lower chambers. How well it works depends a lot on which rhythm is being treated.
For some rhythms, such as many types of SVT, a single ablation has a high chance of a lasting cure. For atrial fibrillation it is more about controlling symptoms than guaranteeing a cure, and a meaningful number of people need a second procedure. Being clear about this difference is an important part of deciding.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
How success differs by rhythm (general picture)
| Rhythm | Single-procedure outlook | Repeat procedure |
|---|---|---|
| Many SVTs / typical flutter | Often a lasting cure | Less commonly needed |
| Paroxysmal (comes and goes) AF | Often improves symptoms | A proportion need a second |
| Persistent AF | Lower chance of lasting control | More often need repeat(s) |
These are broad patterns, not promises, and individual results vary. Your cardiologist will explain the realistic chance for your rhythm. This is a guide, not advice.
Preparing for your procedure
- See the cardiologist (electrophysiologist) who will do the procedure; ask the realistic chance of success and of needing a repeat for your specific rhythm.
- Bring a full list of your medicines. You will be told which to continue, including any blood-thinners, and whether rhythm medicines should be stopped beforehand.
- Tell the team about any allergy to X-ray contrast dye and any kidney problems.
- You may need blood-thinning medicine before and after, and sometimes a scan to check for clots in the heart; follow the instructions you are given.
- You will usually be asked not to eat for a few hours beforehand.
- Arrange a lift home and someone to stay with you, as you should not drive straight afterwards.
- Plan a few days off and ask what the driving rules will be for your situation.
What happens
Depending on the rhythm and the centre, ablation is done under local anaesthetic with sedation or under general anaesthetic. Thin tubes are passed into a vein in the groin and guided to the heart using X-ray and an electrical mapping system.
The team first studies your heart's electrical signals to pinpoint the source of the arrhythmia. They may try to trigger the rhythm so they can find exactly where it comes from. Heat or freezing is then applied through the catheter tip to make small marks that block the faulty signals. For atrial fibrillation this usually means isolating the veins where the abnormal signals start.
The procedure commonly takes a few hours, longer for complex rhythms. Afterwards the tubes are removed and pressure is applied to the groin to stop bleeding, so you lie flat for a few hours. Most people go home the same day or after one night.
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.
May not be suitable if…
- People whose symptoms are mild or well controlled on medicines, where the balance of benefit and risk may not favour ablation.
- Those for whom rhythm-control is not the priority (for example where rate control alone is appropriate).
- People in whom blood clots in the heart, or a high bleeding risk, make the procedure unsafe until addressed.
- Cases where the likely success is low (for example long-standing persistent AF) without a clear discussion of realistic benefit.
Delay or rearrange if…
- Active infection or another acute illness.
- A clot found in the heart on pre-procedure scanning, until it is treated.
- Anticoagulation not yet adequate, or blood-thinners that need adjusting.
- Unstable symptoms or an untreated reversible cause of the arrhythmia (such as an overactive thyroid).
Alternatives to discuss
- Rhythm-control or rate-control medicines.
- Electrical (DC) cardioversion to restore normal rhythm.
- Managing risk factors (blood pressure, weight, alcohol, sleep apnoea) that drive AF.
- Watchful management with blood-thinning where appropriate, without ablation.
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.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
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.
Benefits
- Can reduce or stop episodes of an abnormal heart rhythm and ease symptoms like palpitations, breathlessness and tiredness
- For some rhythms (such as many SVTs), often offers a lasting cure from a single procedure
- Can reduce or remove the need for long-term rhythm-control medicines in some people
- May improve quality of life and ability to exercise
- Avoids open-heart surgery, with a relatively short recovery
Risks & complications
- Bruising, soreness or a tender lump in the groin where the tubes went in
- Palpitations or skipped beats in the first weeks while the heart settles
- Mild chest discomfort after the procedure
- Bleeding or a larger collection of blood at the groin site
- The arrhythmia coming back, needing medicines or a repeat procedure
- Damage to the artery or vein in the groin
- A reaction to the X-ray contrast dye
- Fluid building up around the heart (cardiac tamponade), sometimes needing urgent drainage
- Stroke or mini-stroke from a clot
- Damage to the heart's normal electrical system, occasionally needing a pacemaker
- Narrowing of the heart veins (after AF ablation), or, very rarely, damage to the gullet or other nearby structures
- Very rarely, a life-threatening complication
Ablation is generally low-risk, but the serious complications — fluid around the heart, stroke, or damage needing a pacemaker — matter even though they are uncommon, so urgent warning signs deserve attention. Risk is higher for complex procedures such as VT ablation. Ask your cardiologist for the complication risk specific to your rhythm and centre, and how experienced the team is with it.
Published figures to discuss
Complication and success rates vary widely with the rhythm treated, how persistent it is, your overall heart health and the centre's experience. The figures below are mostly from atrial fibrillation research series and audits, and are a guide rather than your personal odds. Simpler ablations (such as for SVT) tend to be lower-risk and higher-success.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Single-procedure freedom from AF (long-term) | Around 50–55% overall in a large meta-analysis (higher for paroxysmal, lower for persistent AF) | Rises with repeat procedures (reported close to 80% after more than one), at the cost of further procedures. | Long-term Outcomes of Catheter Ablation of Atrial Fibrillation — meta-analysis (PMC)ncbi.nlm.nih.govPublished figure |
| Major complication of AF ablation | Roughly 1–5% across series, with lower rates reported in some recent high-volume centres | Includes tamponade, stroke and vascular injury; varies with case complexity and experience. | Long-term Outcomes of Catheter Ablation of Atrial Fibrillation — meta-analysis (PMC)ncbi.nlm.nih.govPublished figure |
| Fluid around the heart (cardiac tamponade) | Around 0.8% in a meta-analysis of AF ablation procedures | May need urgent drainage; an important reason to act on warning signs. | Long-term Outcomes of Catheter Ablation of Atrial Fibrillation — meta-analysis (PMC)ncbi.nlm.nih.govPublished figure |
| Stroke or mini-stroke | Reported around 0.7% with AF ablation in pooled data | Careful blood-thinning before, during and after reduces this risk. | Long-term Outcomes of Catheter Ablation of Atrial Fibrillation — meta-analysis (PMC)ncbi.nlm.nih.govPublished figure |
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 recover within a few days to a week, with the groin site needing a little care. It is normal for the heart to feel unsettled for a few weeks afterwards, and for atrial fibrillation it can take a couple of months before it is clear how well the procedure has worked.
- Bruising, soreness or a small lump in the groin that settles over a week or two
- Palpitations, skipped beats or brief returns of the old rhythm in the first weeks
- Mild chest discomfort for a short time
- Feeling tired for a few days
Aftercare
- Keep the groin puncture site clean and dry, and watch for swelling, increasing pain or bleeding.
- Avoid heavy lifting, straining and vigorous exercise for the first week or so.
- Keep taking blood-thinning and any other prescribed medicines exactly as directed.
- Do not drive until you are told it is safe.
- Expect some palpitations during the first weeks and know which symptoms are normal and which need urgent help.
- Drink normally to help clear the contrast dye, unless told otherwise.
- Attend your follow-up so the result can be assessed once the heart has settled.
- A lift home and someone to stay with you the first night
- Time off work booked (often a few days to a week)
- All discharge medicines collected, including blood-thinners
- Written instructions on groin wound care
- A clear list of normal symptoms versus urgent warning signs
- A follow-up appointment for after the settling period
- The clinic's out-of-hours number saved
Scars and how they heal
There is no surgical scar. You are left with small puncture sites in the groin, which usually heal to tiny marks. Bruising around them is common and fades over a week or two; a larger bruise or lump occasionally takes longer to settle.
⚠ Get urgent help if…
- Severe or worsening chest pain, or sudden severe breathlessness — call 999
- Fainting, collapse, or a fast pounding heartbeat that does not settle
- Signs of a stroke: face drooping, arm weakness or slurred speech — call 999
- Heavy or uncontrolled bleeding from the groin, or a rapidly swelling, very painful lump
- A cold, pale or numb leg on the side used
- Fever, spreading redness, heat or discharge at the groin (signs of infection)
- Pain on swallowing, vomiting blood or black stools in the weeks after AF ablation — seek urgent advice
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 specialist gives you.
Results & realistic expectations
A good result means fewer or no episodes of the abnormal rhythm and an improvement in symptoms. For some rhythms, such as many SVTs and typical atrial flutter, a single ablation often gives a lasting cure. For atrial fibrillation, ablation is more about controlling symptoms, and a meaningful proportion of people need a second procedure to get the best result.
It usually takes around 8 to 10 weeks before it is clear how well the procedure has worked, because the heart needs time to settle. Some palpitations during this period are normal. Even a successful ablation does not necessarily mean stopping all medicines, and your team will advise on blood-thinners and rhythm control based on your individual risk.
How durable the result is depends on the rhythm. SVT and typical flutter ablations are often a one-time fix. Atrial fibrillation can come back over months or years, partly because the treated areas can reconnect, which is why repeat procedures are sometimes needed. Looking after blood pressure, weight, alcohol intake and sleep can help keep AF under control after ablation.
Related tests, treatments or support
Ablation is often done together with a detailed electrical study of the heart (to map the rhythm first). For atrial fibrillation it usually sits within a wider plan that includes blood-thinning decisions and risk-factor control. Some people have a cardioversion to restore normal rhythm before or after ablation, and decisions about ongoing medicines are made alongside.
Follow-up & long-term care
You will usually be reviewed after the settling period (around 8 to 10 weeks) to assess the result and adjust medicines, sometimes with rhythm monitoring. If the rhythm returns, a repeat ablation or a change of treatment may be discussed. Blood-thinning decisions are based on your stroke risk, not just on whether the ablation seemed to work.
- Attend follow-up and any rhythm monitoring after the settling period
- Keep taking blood-thinners until your team advises otherwise, based on your stroke risk
- Manage blood pressure, weight, alcohol and sleep to help keep AF under control
- Report returning palpitations rather than assuming the ablation has failed for good
- Be ready to discuss a repeat procedure if symptoms come back, especially with AF
Repeat, follow-on and what comes next
- Atrial fibrillation commonly needs more than one procedure; recurrence in the first year is reported in roughly 20–40% of people.
- Recurrence is often due to treated areas (such as the veins) reconnecting, which a repeat ablation can address.
- Repeat procedures are generally as safe as the first and are often shorter.
- Some people move to a different strategy (rate control, or accepting the rhythm with blood-thinning) if ablation does not give lasting control.
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
- A clear explanation that results are judged after a settling period of around 8–10 weeks.
- A written list of normal symptoms versus urgent warning signs, with a named contact.
- A blood-thinning plan based on your stroke risk, not just on the apparent success of the ablation.
- Rhythm monitoring and a plan for what happens if the arrhythmia returns.
- Honest discussion of a possible repeat procedure for AF.
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:
- Which rhythm is being treated and how complex the ablation is (AF and VT are more involved than simple SVT)
- The cardiologist's (operator's) fee and the cath-lab/facility fee
- The energy type and catheters used (for example radiofrequency, cryoballoon or pulsed field)
- Sedation or general anaesthetic, and any overnight stay
- Any pre-procedure scan to check for clots in the heart
- Follow-up appointments and rhythm monitoring
- The chance of needing a repeat procedure, especially for AF
- The cardiologist's fee and the cath-lab/facility fee
- The cost of catheters and energy equipment used
- Sedation or anaesthetic costs and any overnight stay
- Whether a pre-procedure heart scan is included
- Follow-up appointments and rhythm monitoring after the settling period
- The policy and cost if a repeat ablation is needed
- The cancellation policy and what happens if a complication occurs
On the NHS? Catheter ablation is provided by the NHS when clinically indicated; private care is usually chosen for speed, convenience or choice of cardiologist.
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.
Consent traps
- Quoting a single high 'success rate' without saying it may depend on more than one procedure, especially for AF.
- Not distinguishing the strong results for SVT/flutter from the more modest, symptom-focused results for AF.
- Implying blood-thinners can always be stopped after a successful ablation.
- Not explaining that palpitations in the first weeks are normal and not a sign of failure.
- Glossing over serious risks such as tamponade or stroke because they are uncommon.
Marketing red flags
- Promising a 'cure' for atrial fibrillation from a single procedure.
- Headline success figures that hide the need for repeat procedures.
- Downplaying serious complications because they are rare.
- Suggesting ablation removes the need to manage blood pressure, weight, alcohol or sleep apnoea.
Choosing a specialist safely
- Check the specialist 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 specialist 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.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- For my specific rhythm, what is the realistic chance of success from one procedure?
- How likely am I to need a repeat ablation?
- What are the main risks for my type of ablation, and how experienced is the team with it?
- Will I still need rhythm medicines or blood-thinners afterwards, and for how long?
- What symptoms in the first weeks are normal, and which mean I should seek urgent help?
- Exactly what are my driving restrictions afterwards?
- 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 specialist 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?
Frequently asked questions
Will one ablation cure my arrhythmia?
Does ablation hurt?
How soon will I know if it has worked?
Will I still need blood-thinners after AF ablation?
When can I drive again?
Can I have this on the NHS?
Find a verified specialist for catheter ablation for arrhythmia
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.
No verified consultants list this procedure yet — browse the full directory.
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: British Heart Foundation — Ablation Long-term Outcomes of Catheter Ablation of Atrial Fibrillation — meta-analysis (PMC) Risks from Catheter Ablation of Atrial Fibrillation: methods, efficacy and safety (PMC) Treatment Complications of Atrial Fibrillation and Their Management (PMC) DVLA — Cardiovascular disorders: assessing fitness to drive DVLA — Assessing fitness to drive (general guidance) DVA Northern Ireland — Tell 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.
Related guides: Electrical cardioversion (DC cardioversion) · Cardiac resynchronisation therapy (CRT / biventricular pacemaker) · Tilt table test · Balloon valvuloplasty · Coronary angiogram (cardiac catheterisation)