Laser ablation for heart rhythm problems: a Cath Lab 101 guide
Reviewed by Rodnie Oro, cath lab charge nurse · Last reviewed: October 2026 · Education only, not medical advice
Laser ablation in one minute
What it is: using laser energy to treat tissue causing an abnormal rhythm. In AF it is usually delivered from a balloon catheter with a built-in camera.
Who it is for: mainly people with AF having pulmonary vein isolation, in centres that offer it. Use for SVT or VT is limited and mostly in specialist or research settings.
Main risks: bruising in the groin, fluid around the heart, stroke (rare), nerve injury, and the rhythm returning.
Usually: under sedation or general anaesthetic, 2–3 hours, home the same or next day.
On this page: What is laser ablation? · Who is it for? · When is it done? · Step by step · Recovery · Risks · Kit list · First time in the lab? · FAQ
What is laser ablation?
Laser ablation is one of several energy sources for catheter ablation, alongside radiofrequency (heat), cryo (cold) and pulsed field.
- for AF, a balloon is placed at the opening of each pulmonary vein
- a built-in endoscope lets the operator see the tissue
- laser energy is applied in a ring around the vein to isolate it
For SVT and VT, laser approaches are uncommon and mostly used in specialist or research settings.
New to the acronyms? See the Cath Lab Abbreviations A–Z.
Who is it for?
It may be considered for people with:
- atrial fibrillation (pulmonary vein isolation)
- selected other rhythms in specialist or research settings
The decision is made by your heart team, who will talk through the reasons, the alternatives and the risks with you.
When is it done?
It can be planned in advance or done urgently. Before it, you usually have:
- blood tests, including kidney function and blood count
- an ECG, and often an echo or other scan
- a review of your medicines, especially blood thinners and diabetes medicines, as per centre protocol
- a chance to ask questions and give consent
Step by step
1. Getting ready
You lie on the table. Sticky pads go on your chest and back, and ECG, blood pressure and oxygen are monitored. You usually have sedation or a general anaesthetic, as per centre protocol. The groin is cleaned and numbed.
2. Access
Using ultrasound, sheaths are placed in the femoral vein in the groin, sizes per device and operator. Catheters are passed up to the heart under X-ray and a 3D mapping system.
3. Pulmonary vein isolation
- A. Transseptal. A needle crosses into the left atrium.
- B. Balloon at vein. The balloon is placed at a pulmonary vein.
- C. See and treat. Laser energy is applied in a ring under direct view.
- D. Confirm. Isolation is checked for each vein.
4. Finishing
The catheters and sheaths are removed. The groin is closed with pressure or a stitch, per device and operator.
Recovery and aftercare
- First hours: bed rest while the groin settles; checks of the groin, rhythm and blood pressure, as per centre protocol.
- Going home: often the same day or the next morning.
- Groin: avoid heavy lifting and strenuous exercise for about a week.
- Medicines: take blood thinners and rhythm medicines exactly as advised.
- Driving: DVLA rules depend on the rhythm problem; ask your team.
- Follow-up: clinic review, sometimes with an ECG or heart monitor.
Call 999 if you have chest pain, breathlessness, fainting, signs of a stroke, or heavy bleeding or swelling at the access site.
Risks and complications
Your team will explain the risks that apply to you. Possible problems include:
- bruising or bleeding in the groin
- damage to a vein or artery in the groin
- new rhythm problems, sometimes needing a pacemaker (uncommon)
- fluid or bleeding around the heart (tamponade) (uncommon)
- stroke or blood clots (rare)
- the original rhythm problem coming back
Cath lab kit list (printable)
Barts example kit list
An example from one UK centre, written generically. Every lab has its own protocol, and sizes and doses vary.
- venous sheaths in the groin, sizes per device and operator
- diagnostic EP catheters, per operator
- recording system and stimulator
- ultrasound for vein access
- heparin, as per centre protocol
- sedation or anaesthetic, as per centre protocol
- transseptal kit, per operator
- steerable sheath, per device and operator
- laser balloon catheter and console, per device and operator
- oesophageal temperature probe, per operator
Procedural steps (Barts example)
- Access; transseptal
- Heparin, as per centre protocol
- Balloon at each vein; view
- Laser lesions in a ring
- Isolation confirmed; catheters out
First time in the cath lab?
đź’ˇ First-time tip
- Phrenic checks. Pacing to check the diaphragm nerve, per operator.
- Oesophagus. Temperature probe if used.
- Clear view. Saline helps visualise.
- Log lesions. Record each vein.
FAQ
Is it common?
Less common than other energy types.
Is it better?
Each energy has pros and cons; your team will advise.
Is it the same as eye laser?
No; it's a different device and use.
Related Cath Lab 101 guides
Sources
All checked on 10 October 2026. Each page's own date is shown where it gives one.
- Van Gelder IC, et al. 2024 ESC Guidelines for the management of atrial fibrillation. Eur Heart J 2024;45(36):3314–3414. PubMed 39210723
- StatPearls (NCBI Bookshelf), search: laser balloon ablation atrial fibrillation. ncbi.nlm.nih.gov/books
Disclaimer
Education only. This page is for general education for healthcare students, cath lab staff and curious readers. It isn't medical advice and doesn't replace advice from your own doctor, heart team or local unit protocols. Equipment and medicines are described generically. No product or manufacturer is recommended. If you think someone is having a heart emergency, call 999.
Disclosure: I work for a company that makes a device used in this procedure. This page is independent education, isn't sponsored or reviewed by any company, and doesn't recommend any product.
All diagrams on this page are original illustrations created for rodnieoro.com.
