Understanding Angioplasty, FFR, IVUS and the Right Treatment for Coronary Artery Disease
One question I hear very often after coronary angiography is: “Doctor, my report shows a 70% blockage. Do I definitely need a stent?”
The answer is not based on the percentage alone. A coronary artery blockage needs to be interpreted in the context of the individual patient. I look at why the angiography was performed, whether the patient has had a heart attack, the nature of the symptoms, the location and extent of the disease, the amount of heart muscle at risk, and most importantly, whether that particular narrowing is actually limiting blood flow.
Angioplasty should therefore not be viewed as a procedure to treat an angiographic number. The aim is to treat a coronary blockage when doing so is expected to provide a meaningful clinical benefit.
Does a 70% coronary blockage always require angioplasty?
No. A visually estimated 70% blockage does not automatically mean that a coronary stent is required. This is an important distinction because some coronary lesions that appear significant on angiography may actually be intermediate or borderline when assessed more precisely.
In selected stable patients, we can use coronary physiology tests such as Fractional Flow Reserve (FFR) or iFR to determine whether a particular narrowing is significantly affecting blood flow to the heart muscle.
I usually explain FFR to patients in a simple way: it helps us decide whether the blockage we see on the angiogram is functionally important enough to benefit from treatment with a stent.
If physiological assessment suggests that the narrowing is not significantly restricting blood flow, angioplasty can sometimes be deferred and the patient can be treated with appropriate medicines, lifestyle measures and aggressive control of cardiovascular risk factors.
If, however, the blockage is physiologically significant and the finding is consistent with the patient’s symptoms and overall clinical situation, angioplasty may be the appropriate treatment.
So rather than asking only, “Is the blockage 70% or 80%?”, the more useful question is: “Is this blockage actually causing a problem, and is treating it likely to benefit this patient?”
When is a heart stent urgently needed?
The decision is very different when someone presents with an acute heart attack.
During a myocardial infarction, a coronary artery may become critically narrowed or completely occluded because of an acute clot. In the appropriate clinical setting, rapidly restoring blood flow with emergency angioplasty can preserve heart muscle and can be lifesaving.
Similarly, some patients with unstable symptoms or other high-risk clinical features may require an early invasive evaluation and coronary revascularisation.
These emergency situations should be distinguished from an otherwise stable patient in whom a coronary blockage is discovered during an elective evaluation.
Can a patient with coronary blockage avoid a stent?
Patients frequently ask me whether their blockage can be treated without angioplasty. In some patients the answer is yes; in others, a stent or another form of revascularisation may offer greater benefit.
For a stable patient whose symptoms are well controlled, whose coronary anatomy is not considered high-risk, and whose assessment suggests that an intermediate lesion is not significantly limiting blood flow, optimal medical therapy can be a very reasonable strategy.
Medical treatment means much more than simply taking a tablet. It includes effective lowering of LDL cholesterol, good blood-pressure and diabetes control, complete smoking cessation, regular physical activity and lifestyle modification, along with consistent use of prescribed cardiac medicines.
On the other hand, persistent symptoms despite appropriate treatment, significant ischemia, certain high-risk anatomical patterns, or the overall clinical presentation may make revascularisation more appropriate.
My approach is not to avoid a stent at any cost, and equally not to implant a stent merely because a narrowing is visible. The objective is to choose the right treatment for the right patient for the right clinical reason.
How do IVUS and OCT improve complex angioplasty?
Modern interventional cardiology gives us tools that go beyond the conventional angiogram. Intravascular ultrasound (IVUS) and optical coherence tomography (OCT) allow us to examine the coronary artery from within the vessel itself.
I find intravascular imaging particularly valuable in selected complex coronary interventions, including:
- left main coronary artery disease;
- heavily calcified coronary blockages;
- long or complex coronary lesions;
- narrowing or other problems involving a previously implanted stent; and
- situations where angiography alone does not provide enough information to plan or optimise the procedure.
A coronary angiogram essentially provides a two-dimensional outline of the artery. IVUS and OCT can provide additional information about the vessel size, plaque, calcium and the relationship between the stent and the arterial wall.
During complex angioplasty, this information can help in choosing the treatment strategy and appropriate stent size, and in checking whether the implanted stent is adequately expanded and properly apposed. These details can be particularly important when trying to achieve a precise and durable procedural result.
Why does a blockage inside an old stent need a different approach?
When narrowing develops within a previously implanted coronary stent, the angiogram may show us that there is a problem without necessarily explaining why it occurred.
For example, we may need to determine whether the original stent was under-expanded, whether significant calcium is preventing adequate expansion, whether tissue has grown within the stent, or whether another mechanical issue is present.
IVUS or OCT can often help identify the underlying mechanism. Once we understand why the previous stent has failed, treatment can be planned more precisely rather than automatically placing another stent inside it.
Does every severe coronary blockage need a stent?
No. Even when coronary artery disease is extensive or severe, angioplasty is not necessarily the best revascularisation strategy for every patient.
In selected patients, coronary artery bypass grafting (CABG) may offer a more appropriate long-term treatment. This may be particularly relevant in certain patterns of complex multivessel coronary disease, left main disease, diabetes or diffuse disease involving multiple segments of the coronary arteries.
The choice between medical therapy, angioplasty and bypass surgery should therefore take into account the complete coronary anatomy, symptoms, heart function, age, associated medical conditions and the patient’s individual circumstances.
For complex coronary artery disease, a Heart Team discussion between the interventional cardiologist and cardiac surgeon can be useful in deciding the most appropriate revascularisation strategy.
Should you seek a second opinion before angioplasty?
In an acute heart attack, potentially lifesaving treatment should not be delayed simply to obtain multiple opinions.
In a stable patient, however, if there is genuine uncertainty about whether a coronary blockage requires angioplasty, seeking a second opinion can be reasonable.
The purpose of a second opinion is not necessarily to avoid a stent. It may confirm that angioplasty is appropriate. Alternatively, it may lead to further physiological assessment with FFR/iFR, optimisation of medical treatment, additional intravascular imaging, or consideration of bypass surgery.
The goal is to ensure that the treatment recommendation is appropriate for the individual patient and the specific pattern of coronary artery disease.
Questions to ask before deciding on a coronary stent
If your angiography shows a coronary blockage, try not to focus only on the percentage. Useful questions to discuss with your cardiologist include:
- Is this blockage likely to be responsible for my symptoms?
- Is the narrowing significantly reducing blood flow to the heart muscle?
- Can my condition be managed safely with medicines and risk-factor control?
- What specific benefit should I expect from angioplasty in my case?
- Would FFR or iFR help determine whether this blockage needs treatment?
- Would IVUS or OCT provide useful additional information?
- Would bypass surgery be a better option for my pattern of coronary artery disease?
The Key Message
Modern coronary care is increasingly about making treatment decisions with greater precision rather than relying on the angiographic percentage alone.
A coronary stent can be lifesaving during a heart attack and can provide important benefits in appropriately selected patients. At the same time, finding a coronary blockage on angiography does not automatically mean that angioplasty is required.
For me, good interventional cardiology is not about doing more stents or fewer stents. It is about identifying when a stent is genuinely indicated, performing angioplasty well when it is needed, and avoiding an unnecessary procedure when another treatment strategy is more appropriate.
About the author
Dr. Nikhil Patil is a Consultant Interventional Cardiologist at MGM New Bombay Hospital, Vashi, Navi Mumbai. His clinical interests include coronary angiography, angioplasty, complex PCI, intravascular imaging with IVUS/OCT, coronary physiology with FFR/iFR, and evidence-based decision-making for coronary artery disease.
Disclaimer: This article is intended for general health education and does not replace an individual consultation with a qualified medical professional. Anyone experiencing sudden or severe chest pain, pressure or heaviness, sweating, breathlessness, fainting, or other symptoms suggestive of a heart attack should seek emergency medical attention immediately.
