Bypass graft stenting: a Cath Lab 101 guide

Reviewed by Rodnie Oro, cath lab charge nurse · Last reviewed: October 2026 · Education only, not medical advice

Bypass graft stenting in one minute

What it is: placing a stent in a narrowed bypass graft from earlier heart surgery, during PCI.

Who it is for: people with bypass grafts who have new symptoms or a heart attack caused by a narrowed graft.

Main risks: those of PCI, plus a higher chance of debris travelling downstream in old vein grafts.

Usually: under local anaesthetic, 1–2 hours, home the same or next day.

On this page: What is bypass graft stenting? · Who is it for? · When is it done? · Step by step · Recovery · Risks · Kit list · First time in the lab? · FAQ

What is bypass graft stenting?

Bypass grafts can narrow over the years, especially vein grafts. Instead of more surgery, a graft can often be treated with PCI:

• the graft is engaged with a shaped catheter
• a guidewire crosses the narrowing
• a distal protection filter may be placed beyond it
• the narrowing is ballooned and stented

Sometimes the heart team prefers treating the patient's own artery instead of the graft.

New to the acronyms? See the Cath Lab Abbreviations A–Z.

Who is it for?

It may be considered for people with:

• narrowed vein or artery grafts causing angina
• a heart attack caused by a graft
• graft problems shortly after surgery

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 X-ray table. The wrist (or groin) is numbed with local anaesthetic. ECG, blood pressure and oxygen levels are monitored. You may be given medicines to thin the blood, as per centre protocol.

2. Access

A sheath is placed in the radial artery at the wrist or the femoral artery in the groin, sizes per device and operator. A guide catheter is placed at the opening of the coronary artery and heparin is given, dose as per centre protocol. A thin guidewire is passed across the narrowing.

3. Graft treatment

• A. Engage graft. A shaped guide catheter engages the graft.
• B. Wire and protection. A wire crosses; a filter may be placed beyond.
• C. Stent. The narrowing is ballooned and stented.
• D. Check. Flow is checked and any filter retrieved.

You may feel chest discomfort while a balloon or device is in the artery. Tell the team; it usually settles quickly.

4. Finishing

A final angiogram checks the result. The sheath is removed and the wrist closed with a pressure band, or the groin with pressure or a closure device, per device and operator.

Recovery and aftercare

• First hours: checks of the wrist or groin, heart rhythm and blood pressure, as per centre protocol.
• Going home: often the same or next day.
• Medicines: take your blood thinners exactly as prescribed; don't stop them without talking to your heart team.
• Activity: avoid heavy lifting with the treated arm or leg for a few days.
• Driving: the DVLA rules depend on your condition; ask your team.
• Follow-up: clinic review and cardiac rehabilitation where offered.

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 at the wrist or groin
• damage to the treated artery, such as a tear (dissection) or, rarely, a perforation
• debris or clot travelling downstream, causing chest pain or a small heart attack
• heart rhythm problems
• kidney effects from contrast dye
• heart attack, emergency surgery, stroke or death (rare)

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.

• radial or femoral arterial sheath, size per device and operator
• guide catheter, shape per operator
• coronary guidewire(s), per operator
• PCI kit (Y-connector, inflation device and accessories)
• heparin, as per centre protocol
• graft-shaped guide catheter, per operator
• distal protection device, per operator
• stents, sizes per device and operator
• surgical notes with graft details

Procedural steps (Barts example)

• Review graft anatomy
• Access; guide to the graft; angiogram
• Wire; protection if used
• Stent; post-dilatation
• Final angiogram; filter retrieval

First time in the cath lab?

💡 First-time tip

• Graft notes again. Know which graft is being treated.
• Protection kit ready. Especially for old vein grafts.
• Watch for slow flow. Tell the operator straight away.
• Medicines ready. Drugs for slow flow, as per centre protocol.

FAQ

Will I need more surgery?

Often not; stenting can avoid it.

Why not treat my own artery?

Sometimes that is the better option; the team will explain.

Is recovery different?

Recovery is like a standard PCI.

Related Cath Lab 101 guides

• PCI (coronary angioplasty and stents)
• Coronary angiogram
• Chronic total occlusion (CTO PCI)
• Cath Lab Abbreviations A–Z

Sources

All checked on 10 October 2026. Each page's own date is shown where it gives one.

• Knuuti J, et al. 2019 ESC Guidelines for the diagnosis and management of chronic coronary syndromes. Eur Heart J 2020;41(3):407–477. PubMed 31504439
• Byrne RA, et al. 2023 ESC Guidelines for the management of acute coronary syndromes. Eur Heart J 2023;44(38):3720–3826. PubMed 37622654
• StatPearls (NCBI Bookshelf), search: saphenous vein graft intervention. 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.