Stent or bypass? Getting a second opinion
Last reviewed: October 2026
If you have been told you need heart bypass surgery, or a stent in several arteries, it is natural to want to be sure it is the right choice. This page explains how the decision is made, which patients tend to do better with each treatment, and how an independent second opinion works.
The three options
When heart arteries are narrowed, there are three main ways to treat them. They are not mutually exclusive, and most patients need medicines whatever else is done.
Medicines
Tablets to relieve angina and slow the disease, plus lifestyle changes. For some people this is all that is needed.
Stent (PCI)
Narrowings are opened from the inside through the wrist, without surgery. More about stents.
Bypass (CABG)
A surgeon uses arteries or veins from elsewhere in the body to carry blood around the narrowings.
Stent and bypass compared
| Stent (PCI) | Bypass surgery (CABG) | |
|---|---|---|
| How it is done | Through a small tube at the wrist, under local anaesthetic | Open-heart surgery under general anaesthetic |
| Hospital stay | Same day or one night | Usually about a week |
| Back to normal activity | About a week | Usually 6 to 12 weeks |
| Repeat procedures | More likely in the years ahead | Less likely |
| Often preferred for | One or two narrowed arteries, simpler disease, or higher surgical risk | Complex disease in several arteries, especially with diabetes |
In short, a stent is easier to recover from, while bypass surgery is a bigger operation but can be more durable for extensive disease.
What decides the choice
The right treatment depends on the pattern of your disease and on you as a person:
- How many arteries are affected, and whether the narrowings are in critical locations such as the left main stem or the start of the main front artery.
- How complex the narrowings are: length, calcium, branch points and complete blockages. Cardiologists often use a measure called the SYNTAX score to grade this.
- Diabetes: people with diabetes and disease in several arteries generally benefit from bypass surgery.
- Heart pumping function, and whether the heart muscle beyond the narrowings is still alive.
- Your overall health: age, frailty, lung or kidney disease, and previous heart surgery, which can make surgery riskier.
- Your priorities: for example, a quicker recovery versus a lower chance of needing further procedures.
Additional tests can make the picture clearer. A pressure wire measures whether a narrowing truly restricts blood flow, intravascular imaging shows the plaque in detail, and a cardiac MRI shows whether heart muscle would benefit from better blood supply.
The heart team
For complex coronary disease, UK and European guidelines recommend that the decision is made by a heart team: interventional cardiologists and cardiac surgeons reviewing your case together, so that neither treatment is favoured by default.
An impartial opinion
I am an interventional cardiologist, but my aim is to recommend the treatment that is best for you. Where bypass surgery is the better option, I will tell you so and refer you to surgical colleagues.
When a second opinion helps
- You have been advised to have bypass surgery and want to know whether a stent is a realistic alternative.
- You have been told you are too high-risk for surgery, or that your arteries cannot be stented.
- A previous attempt to open a blocked artery was unsuccessful. Specialist CTO techniques may still be an option.
- Your arteries are heavily calcified. Calcium modification techniques can make stenting possible.
- You simply want an independent view before a major decision.
How a second opinion works
- Send your information. Your angiogram images (on a CD or via an image-sharing link), procedure reports and recent clinic letters. Please send these to my secretary before your appointment.
- Review of your images. I review the angiogram frame by frame before we meet.
- Consultation. In person or by video. We go through your symptoms, your scans and the options, including their benefits and risks for you specifically.
- Further tests, if needed. For example a pressure-wire study, intravascular imaging or a cardiac MRI.
- Heart team review, where appropriate. Complex cases can be discussed with cardiac surgical colleagues.
- Written opinion. A clear summary and recommendation for you and, with your permission, your GP and current cardiologist.
Questions patients ask
Will my cardiologist or surgeon mind if I get a second opinion?
No. Second opinions are a normal part of medical care, especially before a major decision such as heart surgery. Most doctors welcome them, and the findings can be shared with your team.
Can I get a second opinion without travelling to Cambridge?
Often, yes. The key information is in your angiogram images and reports, which can be sent electronically. Many second opinions can be completed by video consultation, with a face-to-face appointment if an examination or further tests are needed.
I have been told I am too high-risk for bypass surgery. What are my options?
Some patients who are not suitable for surgery can still be treated with complex stenting, sometimes with heart support devices or specialist techniques for calcified or blocked arteries. Medicines alone are another option. The balance of risk and benefit is discussed with you in detail.
Is a stent always the less risky option?
In the short term, a stent is less invasive and recovery is quicker. For some patterns of disease, however, bypass surgery is the better treatment option, as it gives better long-term results, with fewer repeat procedures and, in some groups such as people with diabetes and disease in several arteries, better survival.
Do I need a GP referral for a second opinion?
Self-funding patients can usually book directly. Insured patients will normally need a GP referral and pre-authorisation from their insurer.
Fees and insurance
Many private medical insurers cover a second-opinion consultation when it is clinically indicated. Please check your policy and obtain pre-authorisation. For self-funding patients, the fee includes review of your angiogram images before the consultation.
Arrange a second opinion
Dr Tom Kaier is a Consultant Interventional Cardiologist at Royal Papworth Hospital with a specialist interest in complex coronary intervention and chronic total occlusions. He sees self-funding and insured patients in Cambridge, and by video consultation.
View booking optionsThis page provides general information and is not a substitute for individual medical advice. If you have chest pain at rest, or chest pain that does not settle, call 999.
Written and reviewed by Dr Thomas Kaier MD MRCP(UK) MBA PhD, GMC No. 7025841.
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