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NON-OBSTRUCTIVE CAD

Coronary Artery Disease Without Blockage (Non-Obstructive CAD)

Coronary artery disease without blockage (non-obstructive CAD) is a condition in which symptoms such as chest pain persist even though no significant blockage is seen on coronary angiography; it also includes clinical definitions such as INOCA and ANOCA. On this page, we look at information about this condition and EECP's possible role.

WHAT IS NON-OBSTRUCTIVE CAD

How Does Non-Obstructive CAD Occur?

Microvascular Dysfunction

Even without significant blockage in the large coronary arteries, dysfunction in the heart's small vessels can lead to chest pain.

Coronary Vasospasm

Temporary constriction (spasm) of the coronary arteries can cause pain even without a visible blockage on angiography.

Persistent Chest Pain

Even when angiography results come back "clean," some patients may continue to experience chest pain and limited exercise tolerance.

Diagnostic Difficulty

Non-obstructive CAD may not always be easily detected with standard angiography; additional tests may be required.
INOCA AND ANOCA

INOCA and ANOCA: Ischemia and Angina Without Blockage

In the cardiology literature, the terms INOCA (Ischemia with No Obstructive Coronary Artery disease) and ANOCA (Angina with No Obstructive Coronary Arteries) are used to describe this picture. Both terms describe situations in which symptoms such as chest pain, pressure, or shortness of breath during exertion persist even though no significant narrowing is seen in the large arteries on coronary angiography.

This picture is often underpinned by coronary microvascular dysfunction (dysfunction of the heart's small vessels) or coronary vasospasm; together, these two mechanisms are often referred to as "microvascular angina." These related concepts are also discussed from different perspectives on our angina and broader coronary artery disease pages.

DIAGNOSTIC PROCESS

Why Can Diagnosis Be Difficult?

Standard coronary angiography is a method designed to visualize blockages in the heart's large arteries; it does not directly show the function of the small vessels (the microvascular circulation). Because of this, the source of persistent chest pain in a patient whose angiography comes back "clean" may not be immediately clear. The fact that symptoms can appear either with exertion or at rest, occur more often in women, and are not always easily confirmed with standard tests can prolong the diagnostic process.

For this reason, in patients suspected of having INOCA/ANOCA, the cardiology team generally proceeds with a more detailed evaluation.

EVALUATION

Methods That May Be Used in the Diagnostic Approach

Detailed Symptom Assessment

The nature of the pain, when it occurs, and its relationship to exertion are carefully assessed; this is the first step that guides diagnosis.

Functional / Reactivity Testing

Some centers may perform specialized tests to assess coronary microvascular function; these tests are not routine for every patient.

Advanced Imaging

When deemed necessary, imaging methods such as cardiac MRI can provide additional information about the heart muscle's blood flow and structure.

Exclusionary Assessment

Other non-cardiac causes that could lead to chest pain are also considered during the evaluation process.
TREATMENT OPTIONS

General Treatment Approaches

Medication

Depending on the symptoms and the nature of the underlying mechanism, your cardiologist may consider different classes of medication. The choice and dosage of medication is entirely at the physician's discretion.

Risk Factor Management

Keeping risk factors such as blood pressure, cholesterol, blood sugar, and smoking under control is an important part of treatment.

Lifestyle Changes

Regular physical activity, a balanced diet, and stress management may be recommended as supportive elements alongside current treatment.
THE ROLE OF EECP

EECP's Current Clinical Role in This Area

Studies on EECP in the field of INOCA/ANOCA and microvascular angina are limited in number, and this topic continues to be researched. While current data suggest that EECP may help support the microcirculation and contribute to a reduction in symptoms in some patients, this is not a guarantee or a definitive cure. In this patient group, EECP is considered as a complementary option — not a replacement for current treatment — when deemed appropriate by the cardiology team. You can review the details of the relevant scientific studies on our Clinical Evidence page.

EECP AND NON-OBSTRUCTIVE CAD

How Is EECP Considered in This Condition?

Aims to Support the Microcirculation

The rhythmic pressure effect created by EECP is intended to support circulation in the small vessels.

May Be an Option for Persistent Symptoms

It is an approach that can be considered by the cardiology team for patients whose angiography is clean but whose symptoms persist.

A Non-Surgical Method

It is an outpatient treatment option that does not require incisions or invasive procedures.

Planned Through Cardiology Evaluation

The suitability of EECP is determined after a detailed cardiology examination.
LONG-TERM APPROACH

Sustainable Follow-Up in Non-Obstructive CAD

Symptoms of non-obstructive CAD can vary from person to person. EECP is not a method guaranteed to eliminate symptoms completely; it is recommended to be considered alongside lifestyle adjustments, medication, and regular cardiology follow-up.

%86
Success Rate
350.000+
Patients Treated
40+
Countries Where Treatment Is Offered
20+
Years of Experience
WHO BENEFITS

Who Might Benefit From an EECP Evaluation?

Patients with no significant blockage on angiography whose symptoms persist
Patients whose chest pain continues despite medication
Patients for whom surgery is not an option or is not required
FREQUENTLY ASKED QUESTIONS

Common Questions About Non-Obstructive CAD and EECP

My angiography came back clean — why do I still have pain?

Even without blockage in the large vessels, chest pain can persist due to causes such as microvascular dysfunction or coronary spasm; this requires a detailed evaluation.

Does EECP treat non-obstructive CAD?

No, no absolute guarantee can be given. EECP may be considered a supportive approach that can help reduce symptoms in some patients.

What tests might be needed?

If needed, your cardiology team can assess microvascular function with additional tests; this process is directed by your doctor.

How does the evaluation process work?

The process begins with a review of your existing angiography and test results, along with a detailed examination.

What are INOCA and ANOCA, and are they the same as non-obstructive CAD?

INOCA and ANOCA are clinical terms describing ischemia/angina without blockage, and they are considered part of the non-obstructive CAD spectrum. They are frequently associated with microvascular dysfunction or coronary vasospasm.

How is a diagnosis of microvascular angina confirmed?

Diagnosis begins with a detailed symptom assessment and, if deemed necessary, may be supported by functional tests or advanced imaging methods. This process is guided entirely by your cardiology team.

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