What Is Cardiac Ablation and Is It Safe?
Cardiac ablation is a minimally invasive procedure used to treat abnormal heart rhythms by creating tiny, precise scars in the heart tissue responsible for the faulty electrical signals. Thin, flexible tubes called catheters are guided through the blood vessels, usually from the groin or wrist, up to the heart, where energy in the form of heat (radiofrequency) or cold (cryoablation) is used to disable the small area causing the rhythm problem. The resulting scar tissue does not conduct electricity, which blocks the abnormal signals and allows a normal heartbeat to be restored. It is one of the most established treatments for many arrhythmias, and for a large proportion of patients it can be genuinely curative.
As for whether it is safe, the short answer is that cardiac ablation is generally considered safe and effective, and serious complications are uncommon, but because it is an invasive procedure it does carry a small degree of risk. The British Heart Foundation notes that for around 90 per cent of people who have it, catheter ablation is successful, though success rates vary considerably depending on the type of arrhythmia being treated. Simpler rhythm problems have very high success rates, while atrial fibrillation is more complex and sometimes requires more than one procedure. As with any intervention, the balance of benefit and risk is something to discuss carefully with the specialist who would carry it out.
What Is Cardiac Ablation?
Your heart beats in a coordinated rhythm driven by electrical signals travelling through its conduction system. In an arrhythmia, those signals are disrupted, either by a faulty focus firing off abnormally or by an abnormal electrical circuit within the heart. Ablation works by identifying that precise trouble spot and neutralising it.
The procedure is carried out by a cardiologist who specialises in heart rhythm disorders, known as an electrophysiologist, in a specialised hospital catheter laboratory. Sensors on the catheter tip first record the heart's electrical activity to map exactly where the problem originates, a stage called an electrophysiology study, before the ablation itself is delivered to that target. The BHF's overview of abnormal heart rhythms provides helpful background on the conditions involved.
Which Heart Conditions It Treats
Cardiac ablation can treat a wide range of arrhythmias, including:
Atrial fibrillation, where ablation electrically isolates the pulmonary veins that trigger the abnormal rhythm
Atrial flutter, a related rhythm disturbance with a very high ablation success rate
Supraventricular tachycardia, a group of fast rhythms including AVNRT and accessory pathway conditions, which often respond extremely well
Some forms of tachycardia and, in selected cases, ventricular arrhythmias
Frequent, symptomatic ectopic beats in certain patients
The NHS information on supraventricular tachycardia and the NHS guidance on atrial fibrillation both cover where ablation fits among the treatment options.
How the Procedure Works
Most ablations are performed under local anaesthetic with sedation to keep you relaxed and comfortable, although longer or more complex procedures are sometimes done under general anaesthetic. After numbing the entry site, the electrophysiologist inserts the catheters through a blood vessel in the groin or wrist and guides them to the heart using X-ray imaging and 3D mapping systems.
Once the source of the arrhythmia is pinpointed, energy is delivered through the catheter tip to create the scar. The procedure typically takes anywhere from one to four hours depending on the complexity of the rhythm being treated. When it is finished, the catheters are removed and pressure is applied to the entry site to stop any bleeding.
Is Cardiac Ablation Safe?
Cardiac ablation has a good overall safety record, and for straightforward procedures the risk of a serious complication is low. Published data on atrial fibrillation ablation, one of the more complex types, puts the periprocedural complication rate at roughly 2 to 3 per cent, and this figure has fallen over the years as technology and operator experience have improved. Simpler ablations for conditions such as supraventricular tachycardia carry an even lower risk.
That said, no invasive procedure is entirely without risk, and it is right to understand what those risks are. They include:
Bruising, bleeding, or discomfort at the catheter entry site, which is common and usually minor
Damage to the blood vessel used for access
A small risk of blood clots or stroke
Rarely, a build-up of fluid around the heart, known as cardiac tamponade
Rarely, damage to the heart's normal electrical system that may require a pacemaker, which is why conditions such as heart block are discussed as part of consent
A small amount of radiation exposure from the imaging used
Serious complications are uncommon, and death is very rare. The individual level of risk depends on the type of arrhythmia, the complexity of the procedure, your general health, and the experience of the centre carrying it out, all of which the electrophysiologist will discuss with you beforehand.
How Effective Is It?
Success depends heavily on which arrhythmia is being treated. Ablation for supraventricular tachycardia is often the most rewarding, with success rates commonly in the region of 90 to 95 per cent, and it is frequently curative. Atrial flutter ablation also has a high success rate.
Atrial fibrillation is more complex. A single procedure improves or eliminates symptoms in a substantial proportion of patients, but some people need a second procedure to achieve a lasting result, and outcomes are generally better for the intermittent (paroxysmal) form than for persistent atrial fibrillation. In our experience, patients tend to find this easier to accept when it is explained clearly at the outset, because knowing in advance that atrial fibrillation ablation is sometimes a two-stage process removes the disappointment if a further procedure is recommended.
Recovery After Cardiac Ablation
Recovery is usually quick. Most people stay in hospital for a few hours of bed rest afterwards, and often overnight, before going home. You should expect some bruising and tenderness at the catheter site, and you will be advised to avoid heavy lifting for a short period. Many people are able to return to driving within a few days, although this depends on the procedure and the type of licence you hold, and your doctor will confirm when it is safe. Full recovery generally takes from a few days to a week.
How We Support Patients Considering Ablation at Heartsure
It is important to be clear that cardiac ablation itself is a hospital-based procedure performed by an electrophysiologist, and it is not carried out at our clinic. What we provide is the essential groundwork that comes before it: accurate diagnosis, characterisation of the arrhythmia, assessment of whether ablation is likely to help, and coordination of onward referral, followed by ongoing follow-up.
Across more than a decade of running diagnostic cardiology in Kingston-upon-Thames, we have completed in excess of 12,000 cardiac investigations, and rhythm disorders are among the most common reasons patients come to us. A first appointment combines a consultant assessment with a 12-lead ECG, and where the rhythm is intermittent, extended ambulatory monitoring using a device such as a cardiac event recorder to capture it. An echocardiogram to assess the heart's structure is often part of the workup too, since structural findings influence treatment planning.
In our experience, characterising the exact arrhythmia with extended monitoring before referral works better than referring on symptoms alone, because a documented rhythm allows the electrophysiologist to plan a more targeted procedure and gives the patient a much clearer picture of what to expect. That preparatory work, done properly through our diagnostic service, is where we add the most value for anyone whose arrhythmia may ultimately need ablation.
Conclusion
Cardiac ablation is a well-established, minimally invasive treatment that can correct many abnormal heart rhythms by neutralising the tissue responsible, and for a large proportion of patients it is highly effective and often curative. It is generally safe, with serious complications uncommon, though as an invasive procedure it carries a small degree of risk that is worth discussing carefully with the specialist. Success varies by arrhythmia, with simpler rhythms responding best and atrial fibrillation sometimes requiring more than one procedure. The foundation of a good outcome is an accurate diagnosis and a clear understanding of your specific rhythm.
If you have an arrhythmia or symptoms such as palpitations and would like a proper assessment, you can contact Heartsure on 0208 255 5999, email info@heartsure.co.uk, get in touch through our contact page, or book an appointment online. Our team in Kingston-upon-Thames offers same-day appointments where clinically appropriate, and most patients are seen within the same week as their first enquiry.
