I have stable angina — do I need a stent?

Often not straight away. For stable angina, Australian and international evidence shows that a stent mainly relieves chest-pain symptoms — it doesn't usually reduce the chance of a future heart attack or death compared with good medicine and lifestyle treatment. That's very different from a heart attack (acute coronary syndrome), where an emergency stent can be life-saving. So for stable disease, optimal medical therapy is generally first-line, and a stent is considered when symptoms aren't controlled by medicines. It's a decision to make with your GP and cardiologist, weighing how much your symptoms limit you.

Stent or bypass — how is that chosen?

It depends on the pattern of the blockages, your other health conditions, and your preferences — and it's usually decided by a 'Heart Team' rather than one doctor. As a general guide, bypass surgery tends to be favoured for more complex disease, blockages in the left main artery, or multiple vessels — particularly in people with diabetes. A stent (angioplasty) is less invasive with a quicker recovery and suits more focal disease or people who aren't suited to surgery. Neither is universally 'better'; the right answer is individual.

What does bypass surgery actually involve compared with a stent?

A stent (coronary angioplasty) is done through a catheter — a balloon opens the narrowed artery and a small mesh tube props it open — with a relatively quick recovery. A coronary artery bypass graft (CABG) is open-heart surgery: a surgeon uses a vessel from your leg, chest or arm to route blood around the blockage. Bypass is bigger surgery with a longer recovery, but for the right pattern of disease it can give durable symptom relief and, in selected people, improve outcomes. The trade-off between them is exactly what to talk through with your team.

Why might someone be offered an implanted defibrillator (ICD)?

An ICD is a device implanted to watch for dangerous fast heart rhythms and deliver a shock to restore a normal beat — preventing sudden cardiac death. For primary prevention (in someone who hasn't yet had a dangerous rhythm), it's considered mainly in people whose heart muscle is significantly weakened — a low pumping function (ejection fraction) — despite good treatment. It can be life-saving, but it also carries risks like occasional inappropriate shocks and procedure complications, so it's a shared decision, not automatic.

Decision aid

Heart procedure decisions — stents, bypass and defibrillators

By Dr HB Lo, FACRRM Reviewed 15 June 2026 4 min read

General information to help you prepare for your GP — not a diagnosis, not personal medical advice. It doesn't replace a consultation, and using it doesn't create a doctor–patient relationship.

If you've got stable angina, or a defibrillator has been raised, you're facing one of the big heart decisions. For stable angina there are three paths: medicines alone, a stent (angioplasty), or bypass surgery. For some people with a weak heart muscle, there's a separate question about an implanted defibrillator (ICD).

A key thing many people don't realise: in stable heart disease, a stent mainly relieves symptoms — it doesn't usually reduce the chance of a future heart attack or death the way it does in an emergency. Medicines do the heavy lifting on preventing events.

This guide explains how each decision is weighed, so you can take clear questions to your GP and cardiology team.

“Fix the plumbing” is the wrong picture — here’s the real one

When a heart problem is described in plumbing terms — a blocked pipe, a quick fix — it’s natural to want the blockage dealt with and to feel that anything less is being fobbed off. But the heart isn’t quite a kitchen sink, and the honest version of these decisions is more interesting than that. For stable angina there are three genuine paths — medicines, a stent, or bypass surgery — and for some people with a weakened heart muscle there’s a separate question about an implanted defibrillator.

This guide lays out how each of those is weighed in Australian practice, so you can walk into the conversation with your GP and cardiology team knowing which questions move the needle.

The fact that changes the stable-angina conversation

Here’s the piece most people aren’t told plainly. In stable angina — chest tightness that’s predictable, brought on by exertion, and not a sudden emergency — opening a narrowing with a stent mainly relieves symptoms. It does not usually reduce the chance of a future heart attack or of dying, compared with good medical treatment, as Australian Prescriber sets out.

That’s a world apart from a heart attack (acute coronary syndrome), where an emergency stent can be genuinely life-saving, per the Heart Foundation/CSANZ acute coronary syndrome guidelines and the 2025 secondary-prevention summary. Same procedure, very different job. Knowing which situation you’re in reframes everything that follows.

Path one: medicines (the foundation for everyone)

For stable angina, optimal medical therapy is generally first-line, per Australian Prescriber and Therapeutic Guidelines. That means medicines to ease and prevent the angina itself, plus the background treatment that lowers your risk of a future event — typically a statin, usually an antiplatelet such as aspirin, blood-pressure control, stopping smoking and cardiac rehabilitation, as the Heart Foundation and HealthDirect describe.

This foundation matters because it does much of the heavy lifting on preventing heart attacks — and it applies whether or not you go on to have a stent or bypass. A procedure addresses a specific blockage; the background medicines reduce risk across the whole heart. It’s worth making sure this layer is solid.

Path two and three: stent versus bypass

When symptoms aren’t controlled by medicines, or the pattern of disease calls for it, the question becomes stent or bypass. The two are quite different procedures:

A stent (coronary angioplasty) is done through a catheter — a balloon opens the narrowed artery and a small mesh tube holds it open — with a relatively quick recovery, as HealthDirect explains.
A bypass (coronary artery bypass graft, CABG) is open-heart surgery, using a vessel from your leg, chest or arm to route blood around the blockage — bigger surgery, longer recovery, but durable for the right disease, per HealthDirect and the Better Health Channel.

As a general guide, bypass tends to be favoured for more complex or multi-vessel disease, blockages in the left main artery, and particularly in people with diabetes; a stent suits more focal disease or people not suited to surgery. The choice is individualised and usually made by a Heart Team rather than one doctor, weighing the anatomy, your other conditions and your preferences. The angina and revascularisation decision aid below lays the three paths side by side so you can prepare the questions — it doesn’t tell you which to choose.

The separate question: an implanted defibrillator (ICD)

Some people are raised a different decision altogether — an implantable cardioverter defibrillator (ICD). This is a device implanted under the skin that watches for dangerous fast heart rhythms and delivers a shock to restore a normal beat, preventing sudden cardiac death, as the Heart Foundation and HealthDirect describe.

For primary prevention — offering it to someone who hasn’t yet had a dangerous rhythm — it’s considered mainly when the heart muscle is significantly weakened, with a low pumping function (ejection fraction), despite good treatment. It can be life-saving, but it carries real downsides too: occasional inappropriate shocks, and procedure or lead complications. That balance makes it a genuine shared decision, not an automatic one — which is what the defibrillator (ICD) decision aid below is built to help you weigh.

The questions worth taking in

Is my angina stable, and if so, what would a stent actually change — symptoms, or my risk of a heart attack?
Is my background treatment — statin, antiplatelet, blood pressure, smoking, rehab — as good as it can be?
If a procedure is on the table, would a stent or bypass suit my pattern of disease, and why?
If an ICD is raised, what’s the benefit and the downside for someone in my situation?

These are questions, not conclusions. The aim is to decide with your GP and cardiology team.

What this is, and is not

This is general information to help you prepare for your GP — not a diagnosis, and not personal medical advice. It doesn’t tell you to have or avoid any procedure, or to start or stop any medicine; those decisions are made with your own doctors. For trustworthy Australian background, see HealthDirect and the Heart Foundation.

Related on this site: the ischaemic heart disease explainer covers the underlying coronary disease in more depth, and the cardiovascular prevention decision aid and the atrial fibrillation anticoagulation decision aid sit alongside this one.

If you want a thorough, unhurried review of your own heart picture, you can work with Dr Lo.

Author: Dr Hoe Bing Lo — AHPRA MED0001212640 · FACRRM. Fun Doctors Pty Ltd · ABN 83 404 436 330.

Tools to take to your GP

Each runs in your browser — nothing you enter is stored or sent anywhere. They help you prepare the questions and print a one-page summary to bring to your appointment. They don't diagnose or recommend a specific treatment.

Frequently asked questions

I have stable angina — do I need a stent?

Often not straight away. For stable angina, Australian and international evidence shows that a stent mainly relieves chest-pain symptoms — it doesn't usually reduce the chance of a future heart attack or death compared with good medicine and lifestyle treatment. That's very different from a heart attack (acute coronary syndrome), where an emergency stent can be life-saving. So for stable disease, optimal medical therapy is generally first-line, and a stent is considered when symptoms aren't controlled by medicines. It's a decision to make with your GP and cardiologist, weighing how much your symptoms limit you.
Stent or bypass — how is that chosen?

It depends on the pattern of the blockages, your other health conditions, and your preferences — and it's usually decided by a 'Heart Team' rather than one doctor. As a general guide, bypass surgery tends to be favoured for more complex disease, blockages in the left main artery, or multiple vessels — particularly in people with diabetes. A stent (angioplasty) is less invasive with a quicker recovery and suits more focal disease or people who aren't suited to surgery. Neither is universally 'better'; the right answer is individual.
What does bypass surgery actually involve compared with a stent?

A stent (coronary angioplasty) is done through a catheter — a balloon opens the narrowed artery and a small mesh tube props it open — with a relatively quick recovery. A coronary artery bypass graft (CABG) is open-heart surgery: a surgeon uses a vessel from your leg, chest or arm to route blood around the blockage. Bypass is bigger surgery with a longer recovery, but for the right pattern of disease it can give durable symptom relief and, in selected people, improve outcomes. The trade-off between them is exactly what to talk through with your team.
Why might someone be offered an implanted defibrillator (ICD)?

An ICD is a device implanted to watch for dangerous fast heart rhythms and deliver a shock to restore a normal beat — preventing sudden cardiac death. For primary prevention (in someone who hasn't yet had a dangerous rhythm), it's considered mainly in people whose heart muscle is significantly weakened — a low pumping function (ejection fraction) — despite good treatment. It can be life-saving, but it also carries risks like occasional inappropriate shocks and procedure complications, so it's a shared decision, not automatic.
Whatever procedure I have, what does the most to protect my heart?

The background treatment does much of the heavy lifting — and it applies whether or not you have a stent or bypass. That means medicines like a statin and (usually) an antiplatelet such as aspirin, good blood pressure control, stopping smoking, and cardiac rehabilitation. Procedures fix specific blockages or rhythm risks; this background work reduces the chance of future events across the board. It's worth making sure this foundation is solid, not just focusing on the procedure.

Source quality

Sources grouped by evidence tier. Australian primary tier first; international where Australia is silent or lagging. How tiers work.

T1 AU primary 11 sources

If you want a thorough, unhurried work-up of your own — not a generic answer — you can work with Dr Lo.