What is it?

Ablation is a treatment of certain heart rhythm disturbances. The rhythm disorders often arise from a 'short circuit' in the heart's conductive tissue. Ablation can help eliminate this short circuit in the heart.

Ablation is often performed immediately following the electrophysiological examination. This treatment is particularly effective for most heart rhythm disturbances and is associated with few complications, which is why it is often preferred to treatment with medication.

What is the process?


Blood thinner medication is preferably started one month before the procedure. The dose will be determined by the GP based on blood analyses.

In preparation, a CT scan of your heart is performed. The CT scan allows the physician to make a 3D reconstruction of your heart, which will act as a guide during the procedure.

You will be admitted to the Cardiac Day Hospital. Fasting is required for the day that you are admitted: that means at least two hours for clear fluids (only water, tea and coffee), at least six hours for a light meal and dairy products and at least eight hours for a regular meal. You may take your medication as agreed with the physician.

If no recent laboratory results are available, blood samples may be collected.

You will be given a gown to wear. The nurse places an IV line in your arm for the administration of medication, should that be necessary.

The procedure is performed in the cardiac catheterisation room.


You lay down on the examination table. Ten adhesive electrodes are placed to monitor your heart rhythm. Because the procedure may take a long time (two to six hours), you will receive a general anaesthetic for your comfort. Before the procedure is started, the possibility of clots in the heart must be excluded by means of a oesophagus echocardiography. An area of skin measuring 5 by 5 cm is shaved and disinfected, and adhesive sterile sheets are placed around it. The vein and artery in the groin are pricked, providing access to electrical catheters that are directed into the heart. With the help of X-ray, the position of the catheters can be confirmed. The catheters are brought into the left atrium through one or two transseptal punctures in the septum.

Using CARTO® imaging and the CT scan to provide a 3D view, the pulmonary veins are isolated from the rest of the heart through burns that are delivered with an ablation catheter. Other sensitive areas generating stimuli are also located and isolated. The rhythm disturbance disappears or the normal heart rate is re-established through cardioversion. After the result has been confirmed the catheters are pulled out. A compression bandage will be placed on the groin. You will wake up in the Cardiology Day Hospital. You will need to stay in the hospital for one night.


In order to prevent infection, it is recommended that you not bathe for the first two days (but you may shower). During the first week, heavy duty at work or physical exertion is not advisable.

What are the risks?

The procedures has a few risks. You may have bruising in the groin. This is best prevented by using a strong bandage and by lying flat.

In 0.5% of the procedures, bleeding can occur due to perforation of the heart wall causing the sac around your heart to fill with blood. This may disappear by itself, but sometimes intervention by a heart surgeon is necessary to close the perforation.

In 0.3% of cases there is a risk of embolism. For this reason, blood thinners are started in advance and kept at the right level around the time of the procedure. You will need to continue taking this medication for at least three months.


Treatment is expected to be successful for 60-90% of patients. Of patients, 20% will require a second treatment for this.

The chance of establishing a permanent stable sinus rhythm depends on various factors. It is the highest in young patients who have short episodes of atrial fibrillation, who have no structural coronary heart disease and who had their first atrial fibrillation recently. The chance of permanent success decreases with age, with the duration of the arrhythmia episodes, with the degree of structural heart abnormalities and with the time since the first episode.

Centres and specialist areas


Latest publication date: 30/07/2021
Supervising author: Dr Provenier Frank