Results vsrisks


A heart rhythm study enables your doctor to study your heart’s electrical activity by placing electrodes inside your heart.

If your arrhythmia is due to atrial fibrillation (an irregular, often rapid heart rate), a heart rhythm study combined with radiofrequency ablation (also known as cardiac ablation or catheter ablation) has a success rate of 70–80%. If you’re an older person with heart disease, the success rate is lower.

The skill of your electrophysiologist plays a big part in the success of the procedure. An electrophysiologist is a cardiologist who has specialist training in heart rhythm studies.


Heart rhythm studies, which are often combined with ablation, are low-risk procedures. The main risk is failure to fix the problem. For 20–30% of people with atrial fibrillation, a heart rhythm study combined with ablation doesn’t work the first time. A repeat procedure increases the rate of success by about 10%.

Apart from this, the risk of complications from a heart rhythm study is usually less than 0.5%.

The main risks and complications are:

Bleeding or infection

This can sometimes occur where the catheter was inserted in your groin.

Injury to blood vessels

Although it’s unusual, an injury to a blood vessel is the most common complication from a heart rhythm study. Occasionally the femoral artery, which is near the femoral vein in your groin, is punctured during the procedure.

Injury to the lining of the lung

It’s possible for your lung to be punctured by the catheter. This can cause air to leak out of your lung and may require drainage of this air until the leakage stops. This complication can sometimes mean you have to spend a few extra days in hospital.

Puncture of the heart or damage to the heart valves

Occasionally a catheter damages the wall of the heart or a heart valve. However, this is extremely uncommon. It sometimes requires surgery to repair the damage.

Induction of severe arrhythmias

The goal of a heart rhythm study is to trigger and study your arrhythmia. Occasionally, the procedure triggers a severe arrhythmia. You may feel dizzy or faint for a few seconds, but the equipment and medical team can usually manage this.

Damage to the heart’s electrical system

Your heart's normal electrical system could be damaged by the procedure. This is usually temporary but if it persists you may need to have a pacemaker implanted.

Damage to other nearby structures

Once the arrhythmia is identified, it’s often treated with radiofrequency ablation. This procedure creates a small burn to the area of the heart that’s causing the arrhythmia. Occasionally, this damages other structures like the veins bringing blood to your heart from your lungs or your swallowing tube (oesophagus).

Blood clots in your legs, lungs or heart

This can lead to stroke if the clot travels to your brain. If your doctor thinks you may be at risk, they’ll give you a blood-thinner.

Heart attack

Rarely, a heart rhythm study triggers a heart attack.

Choosing a specialist

How to find a cardiologist who specialises in heart rhythm studies.


Information is provided by HCF in good faith for the convenience of members. It is not an endorsement or recommendation of any form of treatment nor is it a substitute for medical advice, and you should rely on the advice of your treating doctors in relation to all matters concerning your health. Every effort has been taken to ensure the accuracy of the information, however HCF takes no responsibility for any injury, loss, damage or other consequences of the use of this information.