Catheter ablation is a keyhole procedure done through a vein in the groin, not open surgery, and most people go home the same day or the next morning. It cures supraventricular tachycardia in 90 to 95% of cases; for atrial fibrillation and ventricular tachycardia the single-procedure success is 60 to 80%. Serious complications are uncommon: published rates for atrial fibrillation ablation are about 3 to 5%, with death in roughly 1 in 1,000.
Is heart ablation a surgery, and what does it do?
Catheter ablation is not surgery in the open-chest sense: no cut is made in the chest, and the heart is reached through a blood vessel. Cleveland Clinic states plainly that it is not major surgery and no chest incision is made. The NHLBI describes flexible tubes (catheters) passed through blood vessels into the heart, some carrying electrodes that find where abnormal signals start and others delivering energy to create a small scar that blocks those signals.
The energy can be heat (radiofrequency), extreme cold (cryoablation) or, in newer systems, short electrical pulses (pulsed field ablation). MedlinePlus explains that the scar stops the abnormal electrical signals from spreading, and the American Heart Association notes the scar is tiny and the rest of the heart is not damaged.
The rhythm problems treated, from MedlinePlus and Cleveland Clinic:
- Supraventricular tachycardia (SVT), including AV nodal re-entrant tachycardia and accessory pathways such as Wolff-Parkinson-White syndrome.
- Atrial flutter.
- Atrial fibrillation (AF), where the pulmonary veins are electrically isolated.
- Ventricular tachycardia (VT), which Cleveland Clinic calls potentially dangerous because it can lead to cardiac arrest.
The American Heart Association says ablation is used most often for SVT. The word "surgery" in searches usually means this catheter procedure; the Maze operation during open-heart surgery is a different, surgical ablation.
How often does ablation work for SVT, AF and VT?
Success depends on the rhythm. Cleveland Clinic gives 90% to 95% for SVT and 60% to 80% for atrial fibrillation, atrial tachycardia and ventricular tachycardia, and notes that a repeat procedure is sometimes needed. The NHS says SVT ablation permanently cures the problem in most people.
| Rhythm | Success after ablation | Source |
|---|---|---|
| SVT (AVNRT, accessory pathway) | 90% to 95% | Cleveland Clinic |
| Typical atrial flutter | Acute success above 95% | ESC 2019 SVT guideline |
| Atrial fibrillation | 60% to 80% per procedure | Cleveland Clinic |
| Paroxysmal AF, Indian cryoballoon series | 84% free of arrhythmia at 12 months | PMC12861925, 2025 |
| Persistent AF, same series | 34% free at 12 months | PMC12861925, 2025 |
| Ventricular tachycardia | 60% to 80% | Cleveland Clinic |
The comparison with medicines is the useful number. A 2024 systematic review in BMC Cardiovascular Disorders pooled 12 randomised trials with 3,977 patients and found catheter ablation lowered AF recurrence (relative risk 0.44) and hospitalisations (relative risk 0.44) compared with antiarrhythmic drugs, with all-cause mortality the same in both groups.
The Indian series is local data: one tertiary centre treated 66 consecutive patients with cryoballoon ablation from 2022 to 2024, and 71% were free of atrial arrhythmia at 12 months. The type of AF, not the country, drives the result. Cleveland Clinic warns that symptoms may persist for several weeks and that rhythm disturbances in the first three months are normal.
What are the complication rates, and what can go wrong?
Serious complications are uncommon but real, and the risk is higher for atrial fibrillation than for SVT. A 2011 review in the Journal of Atrial Fibrillation collected the published figures for radiofrequency AF ablation:
| Complication of AF ablation | Reported rate |
|---|---|
| Any major complication | 3.5% to 5% (a survey of 20,000 procedures found 4.5%) |
| Cardiac tamponade (bleeding around the heart) | 0.5% to 2.4% |
| Stroke or transient ischaemic attack | 0.2% to 0.94% |
| Vascular injury at the groin (haematoma, false aneurysm) | 1% to 2% |
| Atrio-oesophageal fistula | under 0.3%, often fatal |
| Pulmonary vein narrowing or phrenic nerve injury | under 0.01% to 0.04% |
| Death | about 1 in 1,000 |
The 2024 meta-analysis confirmed the trade-off: procedure-related complications and tamponade were more frequent after ablation than with drugs, but stroke and deaths were not.
For SVT the numbers are lower. The 2019 ESC guideline cites 2015 ACC/AHA/HRS major complication rates of 3.0% for AVNRT and 2.8% for AVRT ablation, says experienced centres now report much lower rates, and notes a very small but non-negligible mortality risk. The specific worry is the heart's own conduction system: the ESC lists complete heart block in 0.17% to 2.7% and tamponade in 0.13% to 1.1% when an accessory pathway lies near the AV node, and Cleveland Clinic lists a permanent pacemaker as a possible consequence.
In the Indian cryoballoon series, 2 of 66 patients (3.03%) had a serious event, both phrenic nerve injuries that resolved within 3 months, and none died. The NHLBI adds a very slight cancer risk from X-ray exposure.
When is ablation recommended instead of medicines?
Ablation is recommended when medicines fail or cause side effects, or when the rhythm is one that ablation cures outright. The NHLBI says that if medicines do not treat the arrhythmia adequately, ablation is one of the next options; the American Heart Association says the same.
For atrial fibrillation the 2024 European Society of Cardiology guideline moved earlier: it says to consider catheter ablation as a first-line option in paroxysmal AF, or as a second-line option if antiarrhythmic drugs fail to control AF. It also describes AV node ablation with a pacemaker for people whose rate cannot be controlled. The 2024 meta-analysis supports upfront ablation for symptomatic AF with careful patient selection.
For SVT the balance favours ablation because the cure rate is high and the alternative is lifelong tablets. The NHS says SVT is rarely life-threatening and that episodes which last minutes and do not bother you may need no treatment at all, while people who keep having long episodes are offered medicines, cardioversion or ablation. The 2019 ESC guideline notes that for people with infrequent symptoms the decision weighs the invasive procedure against a long-term commitment to drugs.
An electrophysiologist, a cardiologist who specialises in rhythm, makes this call after an ECG, a Holter or event monitor and an echocardiogram to check the heart's structure; see echo test cost for Indian prices. Cleveland Clinic says ablation can be first-line for symptomatic or life-threatening arrhythmias.
What happens on the day of the procedure?
You arrive fasted, the procedure takes 2 to 4 hours under sedation or general anaesthesia, and you lie flat for several hours afterwards. Cleveland Clinic's preparation list: stop blood thinners only as your doctor directs, nothing to eat or drink after midnight, arrange transport home, and have an IV line placed on arrival.
The steps, from Cleveland Clinic and the American Heart Association:
- The groin (sometimes arm or neck) is shaved, cleaned and numbed with local anaesthetic.
- A sheath is placed in the vein and electrode catheters are threaded to the heart under X-ray guidance.
- The team sends small electrical impulses to trigger the arrhythmia and map where it starts. You may feel your heart race; MedlinePlus says this is expected.
- Energy is delivered to the target tissue. MedlinePlus describes a brief burning feeling in some people.
- Catheters are removed and the puncture is closed with pressure, plugs or stitches.
For atrial fibrillation the doctor crosses the septum into the left atrium; the Indian cryoballoon series describes a CT scan beforehand to map the pulmonary veins, or a transoesophageal echo the day before to rule out a clot.
Afterwards you are monitored for six to eight hours. MedlinePlus says you stay in bed for at least 1 hour and up to 5 or 6 hours while the groin seals, and Cleveland Clinic says you go home the same day or stay overnight. The AHA and MedlinePlus both say someone must drive you home.
How long is recovery after ablation?
Recovery is measured in days, not weeks. Cleveland Clinic says most people return to work in five to seven days unless the job involves heavy labour, and should avoid lifting more than 10 pounds (about 4.5 kg) and strenuous exercise for at least a week. The American Heart Association says most people can return to normal activities the day after leaving hospital, with a few exceptions in the first week. MedlinePlus says fatigue, an achy chest and skipped or fast beats are common for 2 or 3 days.
Expect bruising and soreness at the groin; Cleveland Clinic says to call if a lump, swelling, bleeding or increasing pain develops there.
For atrial fibrillation the first three months are a "blanking period". Cleveland Clinic says arrhythmias during this time are normal while the heart heals, that a blood thinner such as apixaban is usually prescribed for several months or longer, and that follow-up visits typically continue for one year. The Indian cryoballoon study measured success only after a 90-day blanking period for the same reason. Do not stop anticoagulants on your own after a successful ablation; the ESC guideline says to continue anticoagulation according to your individual stroke risk, irrespective of whether you are in AF or sinus rhythm.
The 2019 ESC guideline allows all sports one month after SVT ablation if there has been no recurrence. The sources opened for this guide give no fixed driving interval; Cleveland Clinic says to ask your provider.
Which symptoms after ablation need urgent help?
Stroke signs, chest pain and heavy groin bleeding need an ambulance; a racing heart that lasts hours or comes with faintness needs a same-day call. The lists follow Cleveland Clinic and the NHS.
Call 112 at once if your face droops, an arm or leg goes weak or numb, your speech is slurred, or you have chest pain, sudden breathlessness, or bleeding from the puncture site that does not stop with firm pressure.
Contact the hospital the same day for:
- A lump, swelling or spreading bruise at the puncture site, or pain, numbness or tingling in that leg.
- A racing heart with dizziness, light-headedness, breathlessness or chest pain, or a racing heart that lasts three hours or more.
- Fever, or redness and discharge at the puncture site.
- Nausea, vomiting, or pain on swallowing in the weeks after an AF ablation.
MedlinePlus says fatigue and skipped beats are common for a few days. The NHS tells people with atrial fibrillation to call an ambulance if a fast or irregular heartbeat comes with chest pain, breathlessness, sweating, sickness or fainting, and not to drive themselves.
In India ablation is done in cardiac centres with an electrophysiology lab, mostly in large cities, so a referral may mean travel. Ask the centre how many ablations it does each year; Cleveland Clinic notes complications are rarer at high-volume hospitals.
This guide is general information from the sources listed below, not medical advice; a registered doctor makes decisions with you.
