INOCA: the heart disease that shows up on a stress test but not an angiogram

Chest pain with a 'clean' angiogram used to mean reassurance and discharge. A growing body of research says that's frequently the wrong conclusion, especially for women.

Ischemia with non-obstructive coronary arteries — INOCA — describes patients who have objective evidence of reduced blood flow to the heart muscle, typically from an abnormal stress test, but whose coronary angiogram shows no significant blockage in the major arteries the test is designed to find. For years, that combination often resulted in patients being reassured their heart was 'fine' and their symptoms attributed to anxiety or another non-cardiac cause, because the angiogram — the traditional gold-standard test for coronary disease — came back clean.

What angiography alone misses is disease in the coronary microvasculature — the smallest vessels supplying the heart muscle, too small to be visualized on standard angiography — along with coronary artery spasm, both of which can genuinely restrict blood flow and cause real ischemic symptoms without producing the visible blockage angiography is built to detect. INOCA disproportionately affects women, and its historical under-recognition is a significant contributor to the broader pattern of women's cardiac symptoms being dismissed after a technically normal-looking workup.

Diagnosis requires tests specifically designed to assess microvascular and vasospastic function — invasive coronary function testing during the same catheterization procedure, or certain specialized imaging techniques — that go beyond a standard angiogram's scope, and it's not yet universally performed even at centers equipped to do it, meaning access to accurate diagnosis still varies significantly by where a patient is treated.

For anyone with ongoing cardiac-type symptoms and a 'normal' angiogram that didn't fully resolve the question, asking specifically about microvascular disease and INOCA testing — rather than accepting the angiogram result as the final word — is a reasonable and increasingly evidence-supported next step, ideally at a center with cardiologists specifically experienced in this diagnosis.

This article is general health information, not medical advice, and doesn’t replace evaluation by your own physician. Talk to a doctor about anything specific to your own diagnosis or treatment.

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INOCA: the heart disease that shows up on a stress test but not an angiogram

Chest pain with a 'clean' angiogram used to mean reassurance and discharge. A growing body of research says that's frequently the wrong conclusion, especially for women.

This article is general health information, not medical advice, and doesn’t replace evaluation by your own physician. Talk to a doctor about anything specific to your own diagnosis or treatment.