AF ablation: what to know
Catheter ablation is the most effective treatment for restoring and maintaining normal heart rhythm in AF. This is what it actually involves — who benefits most, how it works, and what recovery is realistically like.
Catheter ablation uses energy delivered through thin wires (catheters) threaded up from a vein in the leg to scar specific areas of heart tissue and stop AF from triggering. The most common target is the area around the four pulmonary veins — where most AF starts. It's now considered first-line treatment for many patients with symptomatic paroxysmal AF, and the most effective tool we have for keeping people in normal rhythm long-term. It's a procedure, not surgery — no chest incisions, done under sedation or light general anaesthetic, and most patients are home within 24 hours.
What ablation actually does
The vast majority of AF starts as stray electrical activity firing from a specific area — the tissue around where the four pulmonary veins enter the left atrium. Ablation works by electrically isolating that area from the rest of the heart.
The procedure creates tiny, controlled areas of scar tissue in a ring around the pulmonary veins. Scarred tissue can't conduct electricity, so the rogue signals causing AF can't escape into the main heart muscle. This is called pulmonary vein isolation, or PVI — the cornerstone of every AF ablation procedure.
For most people with paroxysmal AF (where episodes start and stop on their own), pulmonary vein isolation alone is sufficient. For persistent or longer-standing AF, additional areas of the atrium sometimes need to be treated as well — the longer AF has been present, the more the atrium itself remodels and contributes to the rhythm.
The three energy technologies
Three different types of energy are used to create the scar tissue. The choice depends on the AF type, the patient's anatomy, the operator's expertise, and what's available at your treating centre.
| Feature | Radiofrequency (RF) | Cryoablation | Pulsed Field Ablation (PFA) |
|---|---|---|---|
| How it works | Heat (~50 °C) delivered point-by-point through a catheter tip | Cold (~-40 °C) delivered via a balloon at the vein opening | Brief high-voltage electrical pulses |
| In clinical use since | 1990s | 2010s | 2023 in Europe; rolling out in Australia from 2024 |
| Procedure time | Longer (2–4 hours) | Shorter (1.5–2 hours) | Shortest (often under 1 hour) |
| Effect on surrounding tissue | Affects all nearby tissue (heart, nerves, oesophagus) | Affects all nearby tissue | Selective — affects heart muscle, largely spares nerves and oesophagus |
| Best suited for | Persistent AF, redo procedures, complex anatomy | Paroxysmal AF — the most common indication | Most AF — increasingly adopted where available |
Why pulsed field ablation matters
PFA is the first AF ablation technology in 30 years that doesn't rely on heat or cold. It's being increasingly adopted at centres across Australia, particularly for pulmonary vein isolation, although RF and cryoablation remain well-established.
The two long-standing technologies — radiofrequency and cryoablation — both work by changing tissue temperature. They're effective, but the energy they deliver doesn't distinguish between heart muscle and nearby structures. The rare-but-serious complications of ablation, including injury to the oesophagus (which sits just behind the heart) and to the phrenic nerve (which controls the diaphragm), arise from this lack of selectivity.
PFA is different. It uses brief high-voltage electrical pulses that affect heart muscle cells preferentially while largely sparing nerves, blood vessels, and the oesophagus. The clinical consequences:
- Shorter procedures — often less than an hour, compared with two to four hours for RF
- Substantially lower rates of nerve injury and oesophageal complications
- Similar effectiveness for stopping AF in head-to-head trials so far
- Favourable safety profile overall — though long-term data is still maturing
PFA is increasingly available at major centres across Sydney and other Australian cities, with growing adoption among electrophysiologists. If your treating cardiologist refers you for ablation, the question of which technology will be used is worth raising — the answer depends on your individual case, the available equipment, and operator experience.
Who is ablation right for
Ablation isn't for every patient with AF, and it isn't always the first step. The strongest evidence — and the clearest benefit — is in specific groups.
Strongest evidence — first-line option
- Symptomatic paroxysmal AF — current Australian and international guidelines now position ablation as a reasonable first-line option, alongside medication
- Symptoms despite medication — when anti-arrhythmic drugs aren't controlling symptoms or rhythm
- Drug intolerance — when antiarrhythmics can't be tolerated due to side effects
- Younger patients — for whom decades of antiarrhythmic medication aren't an attractive option
- Heart failure with AF — particularly when ejection fraction is reduced. Restoring rhythm in these patients can improve survival and quality of life substantially.
Worth considering — individual decision
- Persistent AF — ablation still works, but with lower single-procedure success rates
- Long-standing persistent AF (over a year continuously) — success rates drop further; often needs more extensive treatment beyond pulmonary vein isolation
- Older patients — age alone isn't a contraindication, but the risk–benefit calculation shifts. Frailty and competing health issues weigh more heavily.
- Asymptomatic AF — generally not recommended on symptom grounds alone; other factors (heart failure, athlete status, occupational requirements) may shift the decision.
Generally not appropriate
- Severe enlargement of the left atrium
- AF as a secondary problem from another untreated condition — significant valve disease, untreated thyroid disease, or uncontrolled sleep apnoea. Fix the upstream cause first.
- Patients unable to take short-term anticoagulation around the procedure
The day of the procedure
Most patients describe the day as easier than they expected. Here's what to actually expect, in order.
Before you arrive
Fasting from midnight (no food, sips of water allowed up to a couple of hours before). Your usual medications continue unless you're told otherwise — particularly your blood thinner, which is generally continued through the procedure. Wear comfortable clothing you can leave the hospital in.
On arrival
Admission, baseline ECG, blood tests, and an IV cannula placed in your arm. You'll meet your electrophysiologist, anaesthetist, and nursing team. Vascular access for the procedure is through veins in the groin — no chest incisions, no shaving of the chest.
The procedure itself
Done under either deep sedation or light general anaesthetic, depending on operator preference and complexity. Small catheters are threaded up from the groin to the heart under live X-ray guidance. The pulmonary vein isolation is then performed using whichever energy technology has been chosen for your case. Duration ranges from under an hour (PFA in straightforward cases) to about four hours (RF for persistent AF or complex anatomy).
After the procedure
You'll wake up in a recovery bay. Firm pressure is applied to the groin sites for a period, then you'll lie flat for several hours to let the small puncture sites seal. This lying-flat period is the most tedious part of the day for most patients. Once cleared by nursing staff, you can sit up, eat, and walk to the bathroom.
Discharge
Many patients go home the same day. Some — particularly older patients or those who had longer procedures — stay overnight. You won't be able to drive yourself home; arrange a lift in advance.
Recovery: weeks 1–3
The first 24 hours
Rest at home. No driving, no heavy lifting, no strenuous activity. Some chest discomfort, throat soreness (from the imaging probe used during the procedure), and mild fatigue are normal.
The first week
Gentle activity is fine — walking, light household tasks. Avoid strenuous exercise, heavy lifting (anything over about 5 kg), and prolonged sitting. The small groin puncture sites need to seal completely; a small bruise is common, but a firm, expanding lump warrants medical review.
Common early symptoms
- Mild chest discomfort, particularly with deep breathing — usually settles within days
- Throat soreness from the trans-oesophageal probe — settles within a week
- Brief palpitations or short AF episodes — normal during healing (see the next section)
- Mild fatigue — usually settles within two to three weeks
Anticoagulation
Blood thinners are continued for at least two to three months after the procedure, regardless of your pre-procedure stroke risk profile. After that, the decision to continue or stop depends on your individual stroke risk — not on whether the ablation appears successful.
Returning to work
Most desk-based workers return within a few days. Physical work or driving for a living usually requires one to two weeks off. Your team will give you specific guidance based on your job.
The blanking period
One of the most important things to know about AF ablation is that early recurrence is common — and it doesn't mean the procedure has failed.
The first three months after ablation are called the blanking period. During this window, inflammation from the healing process can itself trigger temporary arrhythmias. Up to 40% of patients experience some palpitations, brief AF episodes, atrial flutter, or other rhythm symptoms during this time.
This is common and is not automatically considered treatment failure. Isolated brief episodes during the blanking period don't usually warrant any change in management. Many patients are continued on an anti-arrhythmic medication through this period and then stopped at the three-month mark. Frequent or sustained recurrence during the blanking period may prompt closer review, since it can be associated with higher later recurrence risk — but the verdict on whether ablation has succeeded is still made at three months, not three weeks.
Episodes that are severe, sustained, associated with chest pain or significant breathlessness, or accompanied by signs of stroke need urgent medical attention regardless of the blanking-period rule.
Success rates — the honest version
"Cure" is the wrong frame for AF ablation. The honest measure is significant freedom from symptomatic AF over time — and the numbers depend heavily on what type of AF you have and what else is being done alongside the procedure.
| AF type | Single procedure | After redo if needed |
|---|---|---|
| Paroxysmal AF | 60–80% free of AF at 1 year | 80–90% |
| Persistent AF | 50–65% | 70–80% |
| Long-standing persistent AF | 30–50% | 50–65% |
These numbers improve substantially when modifiable AF drivers are addressed alongside ablation — sustained weight loss, treating sleep apnoea, tight blood pressure control, and reducing alcohol have all been shown to roughly double single-procedure success rates in patients who needed them.
About 20–30% of patients need a second procedure — what's often called a "touch-up". This is expected, not a sign of failure. Most second procedures find one or two areas where the original scar lines have healed and are conducting electricity again; re-isolating those areas is usually all that's needed.
Even when AF recurs after ablation, the episodes are typically less frequent, shorter, and less symptomatic than before the procedure.
Risks
Serious complications are uncommon — typically under 2–3% in experienced hands. Here's what they actually are, with honest frequency estimates.
| Complication | Approximate rate | What it means |
|---|---|---|
| Major bleeding at groin site | ~1% | Usually managed with prolonged pressure; occasionally requires a small intervention. |
| Bleeding around the heart (tamponade) | ~0.5–1% | Detected on echo during the procedure and drained via a small catheter. Most cases resolve completely. |
| Stroke or TIA | ~0.3–0.5% | Minimised by careful anticoagulation before, during, and after the procedure. |
| Phrenic nerve injury | Under 1% | Affects the diaphragm and can cause breathlessness. Usually temporary. Substantially lower with PFA. |
| Pulmonary vein narrowing | Under 0.5% | Uncommon with modern technique. Can occasionally need treatment. |
| Atrio-oesophageal fistula | Very rare (under 0.1%) | The most serious complication of ablation — a connection between the atrium and oesophagus. PFA's tissue selectivity reduces this risk significantly. |
| Death | Under 0.1% | Comparable to other elective cardiac procedures. |
Complication rates correlate strongly with operator and centre volume. High-volume electrophysiologists at high-volume centres consistently report lower complication rates than the published averages — another reason the choice of operator matters as much as the choice of energy technology.
Who performs AF ablations
AF ablations are performed by electrophysiologists — cardiologists who have undertaken additional subspecialty training in the heart's electrical system and the procedures that manage rhythm disorders.
The pathway to ablation almost always starts with a general or interventional cardiologist, not directly with an electrophysiologist. The pre-ablation assessment matters as much as the procedure itself, and includes:
- Confirming your AF type and pattern (paroxysmal, persistent, or long-standing)
- An echocardiogram to assess heart structure, valve function, and atrial size
- Looking for and addressing reversible drivers — thyroid disease, sleep apnoea, alcohol, weight, blood pressure
- Determining whether you're likely to benefit from ablation, and whether now is the right time
- Making the referral to the appropriate electrophysiologist for your case
At Heartcare Sydney, Dr Reza Moazzeni provides this comprehensive pre-ablation assessment. When ablation is appropriate, referral is made to specialist electrophysiology colleagues at Westmead Hospital and other major Sydney centres.
Frequently asked questions
Is ablation a cure for AF?
"Cure" is too strong a word. Ablation produces significant freedom from symptomatic AF in most patients, particularly those with paroxysmal AF. For some, that freedom lasts many years; for others, AF may eventually return — usually less frequently and less severely than before. The honest measure is meaningful improvement in symptoms and quality of life, not permanent elimination of any future episode.
Will I still need blood thinners after a successful ablation?
For at least two to three months after the procedure, yes — to allow the scar lines to heal completely. Beyond that, the decision depends on your individual stroke risk profile, not on whether the ablation appears successful. Most patients who needed anticoagulation before ablation continue it long-term, because silent AF recurrence can still cause strokes.
How long will I need off work?
Most desk-based workers return within a few days. Physical jobs, jobs involving heavy lifting, or driving for a living usually require one to two weeks. Your team will give specific advice based on what you do. Many patients use the time to manage other AF drivers — particularly sleep and stress.
Can my AF come back after ablation?
Yes, in some patients. About 20–30% of paroxysmal AF patients need a second procedure for recurrence. Recurrence rates are higher with persistent AF, and higher again when modifiable drivers (weight, sleep apnoea, blood pressure, alcohol) aren't addressed alongside. Even when AF does recur, episodes are usually less frequent and less symptomatic than before.
Is general anaesthetic always needed?
Not always. Many procedures are done under deep sedation rather than full general anaesthetic. The choice depends on the operator's preference, the complexity of the case, and your personal medical history. Either way, you won't be aware of the procedure.
Will I need a second procedure?
Possibly — about 20–30% of patients with paroxysmal AF, and a higher proportion with persistent AF, need a second "touch-up" procedure. This is expected and isn't considered a failure of the first. Most touch-ups find one or two areas where the original scar lines have healed and re-connected; re-isolating those areas is usually straightforward.
How do I get a referral for ablation?
The pathway is GP → cardiologist → electrophysiologist. Your GP can refer you to a cardiologist for a comprehensive AF assessment. If ablation is appropriate, the cardiologist will then refer you to a specialist electrophysiologist. Going directly to an electrophysiologist isn't usually the right pathway — the pre-ablation assessment shapes everything that follows.
The bottom line
Ablation is the most effective tool we have for keeping people in normal rhythm — but it works best when the underlying drivers of AF are also being treated. Weight, sleep apnoea, blood pressure, alcohol: these aren't optional add-ons to ablation. They're what makes ablation work.
References & further reading
- Guideline Van Gelder IC, Rienstra M, Bunting KV, et al. 2024 ESC Guidelines for the management of atrial fibrillation developed in collaboration with the European Association for Cardio-Thoracic Surgery (EACTS). DOI: 10.1093/eurheartj/ehae176 Eur Heart J. 2024;45(36):3314–3414.
- Trial analysis Kirchhof P, Camm AJ, Goette A, et al. (EAST-AFNET 4 Investigators) Early rhythm-control therapy in patients with atrial fibrillation. DOI: 10.1056/NEJMoa2019422 N Engl J Med. 2020;383(14):1305–1316.
- Trial analysis Andrade JG, Wells GA, Deyell MW, et al. (EARLY-AF Investigators) Cryoablation or drug therapy for initial treatment of atrial fibrillation. DOI: 10.1056/NEJMoa2029554 N Engl J Med. 2021;384(4):305–315.
- Trial analysis Wazni OM, Dandamudi G, Sood N, et al. (STOP AF First Investigators) Cryoballoon ablation as initial therapy for atrial fibrillation. DOI: 10.1056/NEJMoa2029554 N Engl J Med. 2021;384(4):316–324.
- Cohort study Pathak RK, Middeldorp ME, Lau DH, et al. Aggressive risk factor reduction study for atrial fibrillation and implications for the outcome of ablation: the ARREST-AF cohort study. DOI: 10.1016/j.jacc.2014.09.028 J Am Coll Cardiol. 2014;64(21):2222–2231.
- Patient body Heart Foundation Australia Atrial fibrillation — patient information. heartfoundation.org.au/your-heart/atrial-fibrillation
- Patient body HeartRhythm Alliance Australia (StopAfib) Patient resources and support for people living with AF. heartrhythmalliance.org/aa/au
Considering AF ablation?
A cardiology assessment confirms whether you're a good candidate for ablation, addresses the modifiable drivers that improve ablation success, and arranges referral to the right electrophysiologist. Dr Reza Moazzeni provides this assessment at Westmead. A GP referral is required.
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