Can Plaque in Arteries Be Reversed? What the Scans Show

Plaque in the arteries can be reversed, partly. That is not a hopeful guess. It has been measured directly, with ultrasound probes threaded inside the coronary arteries, in trials of thousands of people. What those trials also show is how small the reversal is, what it takes to get it, and why the goal is really to stop plaque growing and make it stable, not to make it disappear.

The other thing worth saying at the start: no food cleans arteries. Searches for foods that unclog arteries return lists of salmon, walnuts and olive oil. Those are good foods, and a good diet does slow plaque growth. But no trial has shown a single food removing plaque, and the reversal that has been measured came mostly from lowering LDL cholesterol hard, usually with medication.

How plaque is measured, and why the numbers look small

The best trials use intravascular ultrasound, a tiny probe passed into a coronary artery during an angiogram. It measures percent atheroma volume: how much of the artery wall's total volume is plaque. Scans are repeated after one to two years on treatment.

Changes are reported in percentage points, and they are small. A fall of one percentage point sounds trivial. In this measure it is a meaningful result, because untreated or undertreated plaque keeps growing, and the comparison is between shrinking slightly and growing steadily.

What statins did inside the artery

In the ASTEROID trial, 507 people with coronary disease took a high dose of rosuvastatin, 40 mg a day. Average LDL cholesterol fell from 130 to 61 mg/dL. After two years, the 349 with repeat scans showed plaque volume down by about one percentage point, 0.98 on average. It was the first convincing demonstration that intensive treatment could make plaque shrink rather than merely slow.

The larger SATURN trial compared the two strongest statins, rosuvastatin and atorvastatin at maximal doses, in 1,039 people for two years. Both shrank plaque, by about one percentage point, and both did so in most patients: 63 percent on atorvastatin and 68 percent on rosuvastatin showed regression.

Adding newer cholesterol drugs

PCSK9 inhibitors are injected cholesterol drugs that lower LDL far below what statins reach on their own. In the GLAGOV trial, 968 people already on statins were given evolocumab or placebo for 18 months. Plaque volume rose slightly on placebo, by 0.05 percentage points, and fell by 0.95 on evolocumab. Regression happened in 64 percent on the drug against 47 percent on placebo.

In PACMAN-AMI, 300 people who had just had a heart attack took high-dose rosuvastatin plus either alirocumab or placebo for a year. Plaque volume fell by 2.13 percentage points with alirocumab and 0.92 with placebo, in arteries that had not caused the heart attack. That is the largest regression in this kind of trial, and it came from the lowest LDL levels.

The pattern across all four trials is the same. The lower LDL cholesterol goes, the more plaque shrinks.

Why a calcium score can go up when treatment is working

Many people have a coronary calcium scan, which counts calcified plaque. Some are alarmed when the score rises after starting a statin. A pooled analysis of the ultrasound trials found statins increase plaque calcification independently of their effect on plaque size. Calcified plaque is thought to be more stable and less likely to rupture, which is what causes most heart attacks.

So a rising calcium score on a statin does not by itself mean treatment is failing. It is one reason a calcium score is better used to decide whether to start treatment than to track how well treatment is working. Discuss any change with your doctor rather than stopping the statin.

What diet and lifestyle can do

The most famous lifestyle study is also one of the smallest. In the Lifestyle Heart Trial, 48 people with coronary disease were randomised to a very low-fat vegetarian diet, exercise, stress management and stopping smoking, or to usual care. After one year, artery narrowing improved slightly in the lifestyle group and worsened in the control group, and the difference had widened at five years. Cardiac events over five years were 25 in 28 lifestyle patients against 45 in 20 controls.

Those results are striking and they come with obvious limits. Only 20 lifestyle patients and 15 controls completed five years, the programme was intensive enough that few people sustain it, and it changed several things at once, so no single part can take the credit.

A larger and more practical result comes from the CORDIOPREV trial, in 939 people with coronary disease. Over five to seven years, a Mediterranean diet reduced the thickness of the carotid artery wall slightly, by about 0.03 mm, while a low-fat diet did not change it. Wall thickness is a marker of atherosclerosis rather than plaque volume itself, but it is the best evidence that an ordinary, sustainable diet can move the needle.

The fair summary is that a good diet slows plaque growth and may reverse a little of it, and that intensive LDL lowering reverses more. Most people with established plaque need both.

Exercise, smoking and the rest

Exercise lowers the risk of heart attacks and helps with weight, blood pressure and blood sugar, but trials that measured plaque directly have not shown exercise alone shrinking it. Do it for the outcomes it does change.

Stopping smoking is the single largest lifestyle change for someone with arterial disease, and it matters more than any food.

Blood pressure and blood sugar matter too. Both damage the artery lining that plaque grows on, and treating them reduces events even when plaque size does not change much.

Supplements

No supplement has been shown to shrink plaque. Some lower LDL cholesterol modestly, berberine among them, and lowering LDL is the mechanism that matters. That does not make them substitutes for a statin in someone with established disease, because statins have been shown to prevent heart attacks and supplements have not. Red yeast rice is a special case: it contains monacolin K, the same molecule as lovastatin, which means it is a statin of unknown dose rather than an alternative to one.

Does plaque ever go away completely?

No treatment in these trials made plaque disappear. The best results reduced plaque volume by one to two percentage points. The realistic goal is to stop plaque growing, shrink it a little, and make what remains stable, which is what prevents heart attacks and strokes. In the trials, that is achievable for most people who get their LDL cholesterol low enough.

What to ask your doctor

What is my LDL cholesterol, and what target is right for me given my risk? Am I on a statin dose that reaches it? If not, would ezetimibe or a PCSK9 inhibitor help? And if I have had a calcium scan, what does it mean for my treatment, rather than as a score to chase?

When it is an emergency

Call emergency services for chest pain or pressure that lasts more than a few minutes or spreads to the arm, jaw or back, especially with breathlessness, sweating or nausea, and for sudden face drooping, arm weakness or difficulty speaking. Those are heart attack and stroke symptoms, and minutes matter.