CT calcium versus standard risk assessment: what the statin study found

• Over 4.2 years, major cardiovascular events were recorded in 2.7% of participants in each group.
• CT calcium scoring led to fewer recommendations to start statins; patients who received such a recommendation were more likely to adhere to treatment.
• The study did not confirm that the CT-based strategy was noninferior to standard risk assessment.

Why researchers tested an approach to statin prescribing

Cardiovascular disease remains the leading cause of illness and death worldwide, and a substantial proportion of its consequences are linked to atherosclerosis. In this condition, fatty deposits, or plaques, build up inside the arteries, restricting blood flow and increasing the likelihood of a heart attack or stroke. The large CorCal Outcomes study tested whether imaging the coronary arteries could help doctors make more precise decisions about whom to recommend preventive statin treatment to.

To assess risk, doctors consider smoking, diabetes, high blood pressure, and elevated cholesterol. Statins lower cholesterol, particularly low-density lipoprotein (LDL), and are used to reduce the likelihood of serious cardiovascular complications. However, it is not easy to determine exactly who will benefit from treatment: some people who later have a heart attack do not appear to be at high enough risk to be prescribed statins under conventional risk assessment.

CorCal Outcomes principal investigator Joseph B. Muhlestein of Intermountain Medical Center noted that a heart attack is the first manifestation of atherosclerotic cardiovascular disease for many patients. He said that among people who have had a first heart attack, particularly younger adults, some had not previously been identified as being at high enough risk to warrant statin therapy. This gap in risk assessment, treatment initiation, and continuation prompted the team to examine a different approach to decision-making.

Two strategies: risk assessment and artery scanning

The results of CorCal Outcomes were presented during a Hot Line session at the 2026 ESC Congress. The study compared two strategies: statin recommendations based on standard cardiovascular risk assessment and recommendations based on coronary artery calcium. The researchers wanted to find out whether information about the arteries themselves would change the choice of preventive therapy before a cardiovascular event occurred. The study compared approaches to making recommendations; it did not mandate that participants take a medication.

The first group used the pooled cohort equations, or PCE, a widely used risk calculation tool. It takes into account traditional measures, including age, cholesterol levels, blood pressure, and smoking status. The second group relied on the coronary artery calcium score, or CAC. Unlike estimating probability based on personal characteristics and health measurements, this approach can detect calcium deposits in the coronary arteries.

Calcium can build up in atherosclerotic plaques, so detecting it is a sign of existing coronary artery disease, including in people without symptoms. CAC is measured using a CT scan. Rather than simply estimating the likelihood of future problems based on risk factors, the scan provides information about calcium deposits in the arteries that supply blood to the heart. This difference was the basis of the strategy being tested.

What the 4.2-year comparison showed

The study included 5,772 patients from the Canyons and Desert regions of Intermountain Health Care in the United States. Participants had no known atherosclerotic cardiovascular disease or diabetes and had not previously received statins. The participants’ mean age was 64, and women made up 51% of the group. These characteristics describe the sample in which two approaches to making recommendations for preventive treatment were compared.

Participants were randomly assigned in equal proportions to two groups: recommendations for one group were based on traditional risk factors, while recommendations for the other were based on coronary artery calcium scan results. Both patients and their physicians received information about the recommendations prepared according to the study protocol. However, the decision about whether to start taking a statin remained with the patient and physician. Thus, the study assessed strategies in which a recommendation could influence the choice, but did not automatically prescribe treatment.

Researchers tracked major cardiovascular events, defining this composite measure to include death from any cause, myocardial infarction, stroke, and procedures to restore blood flow in narrowed or blocked arteries. The average follow-up was 4.2 years. This set of outcomes covered both clinical events and procedures on the arteries; it was used to compare the results in the two groups, which were formed using different methods of risk assessment.

The same event rate does not mean equal effectiveness

During the follow-up period, at least one event included in the primary endpoint was recorded in 2.7% of patients in each group. Thus, the observed event rate was the same with PCE-based recommendations and with the coronary calcium approach. The estimate of relative risk over time was also similar: the hazard ratio was 0.99, with a 95% confidence interval of 0.71 to 1.38. These data describe the comparison results, but do not by themselves establish that the methods are equivalent.

The key limitation is that the study did not meet the prespecified statistical criterion required to show that the scanning strategy was not inferior to standard risk assessment by a clinically meaningful margin. Therefore, the same event rate and nearly identical relative-risk estimates do not confirm that the approaches are equally effective. The authors explicitly acknowledge this uncertainty; the findings should not be interpreted as evidence that CT scanning can replace conventional risk calculation.

At the same time, the coronary calcium–based strategy led to significantly fewer recommendations to start statins, and patients who were advised to begin treatment based on their scan results were substantially more likely to follow the recommendation. The published report does not provide numerical measures of these differences. The researchers believe that scanning may help target therapy more effectively, but emphasize the need for further studies. For now, it remains unclear whether this approach will lead to better outcomes in cardiovascular disease prevention.

Source: ScienceDaily