The Screening Cascade: How a Calcium Scan Becomes a Stent You Never Needed

It usually starts with good intentions. A patient with no symptoms — or stable, predictable symptoms — gets a coronary artery calcium (CAC) scan “just to know.” The score comes back elevated. Nobody sleeps well after a four-digit calcium score.

What happens next follows a script I have watched for twenty-five years. The elevated score leads to a stress test. The stress test is read as abnormal — as it often is in people who already have coronary disease, which is nearly everyone by middle age. The abnormal stress test leads to a catheterization. The catheterization finds a blockage — again, it usually does — and the blockage gets a stent. The patient goes home grateful, telling family the doctors caught it just in time.

I call this the screening cascade, and each step feels logical. The problem is where it ends.

The scan sees the wrong plaque

A calcium scan detects calcified plaque — the old, scarred-over, stable kind. But the plaque that ruptures and causes most heart attacks is the soft, inflamed, non-calcified kind, and it is essentially invisible on a calcium scan. So the test confirms what decades of autopsy studies already tell us — coronary disease starts young and is nearly universal — while missing the very lesions that cause emergencies.

The stent at the end doesn’t change your odds

This is the part patients rarely hear before the cath. In stable coronary disease — including stable angina — elective stents have repeatedly failed to prevent heart attacks or extend life. The definitive test was the ISCHEMIA trial (New England Journal of Medicine, 2020): 5,179 patients with stable disease and moderate-to-severe abnormal stress tests — precisely the people the cascade funnels toward the cath lab — were randomized to an invasive strategy versus medical therapy alone. After a median of 3.2 years, death from any cause was 5.6% in the invasive group and 5.6% in the conservative group. Identical to the decimal point. COURAGE found the same thing in 2007. ORBITA went further and showed that even the symptom relief attributed to stents shrank dramatically when tested against a placebo procedure.

One distinction I will repeat as long as I practice: a stent placed during a heart attack is lifesaving. That is emergency plumbing, and it works. The cascade is about elective stents in stable patients — a different procedure with a different evidence base.

The false story that follows the stent

Here is the quiet cost. In a study from Annals of Internal Medicine, more than 80% of patients who received an elective stent believed it would prevent a heart attack or save their life. Only about one in five of their own cardiologists agreed. The patient leaves the cath lab with a powerful, comforting, and usually false narrative — “the stent saved me” — and the actual drivers of their disease (insulin resistance, inflammation, blood pressure, sleep, stress, diet) often go right on untreated, because the problem feels solved.

What I do instead

I assume the disease is present — in my patients and in myself — because the data say it almost always is. Then I work on the causes: metabolic health, ApoB and particle number, blood pressure, sleep, stress, movement, and the inflammation underneath it all. No radiation, no cath-lab risk, and unlike an elective stent, these measures actually move mortality.

And if you are standing at the top of the cascade right now — an elevated calcium score in hand, a stress test or catheterization on the calendar, no emergency in sight — the single most valuable thing you can do is slow down and get a second opinion before the next irreversible step. That is a large part of what I do in telehealth consults at Natural Heart Doctor.

Educational content, not medical advice. Never stop or change treatment without your physician. If you have chest pain or symptoms of a heart attack, call 911.