Two new trials point to a potential tiebreaker for patients caught in the gray zone on heart disease risk. A coronary artery calcium scan, meaning a low-dose CT image that detects calcified plaque inside the arteries near the heart, can add clarity when a standard risk calculator leaves the prescription decision open. Both studies say the answer still depends on the individual patient.
The broader debate predates these trials. When a clinician is trying to predict whether a patient will have a heart attack or stroke, the question is whether they need a number, a picture, or both.
The two tools being weighed
The number comes from the PREVENT calculator, a newly adopted formula that estimates a patient's likelihood of a serious cardiovascular event over time. It pulls from characteristics recorded on paper: age, blood pressure, cholesterol levels, and similar measures. The trouble arises in the middle of that range. A score that lands between clearly high and clearly low leaves clinicians with an open call on whether to act.
The picture is the CAC scan. It looks directly inside the arteries rather than projecting risk from patient data alone. Calcium deposits signal that plaque has already built up, and a high score is a warning. A score of zero can provide meaningful reassurance even when the PREVENT formula suggests moderate concern.
The treatments at stake include statins and other medications aimed at reducing damage to blood vessels supplying the heart and brain. Statins lower cholesterol by cutting the amount of low-density lipoprotein, or LDL, in the blood. Lower LDL slows plaque accumulation inside those vessels. For patients clearly in the high-risk range, the case for starting a statin is settled. The trials address the harder group: the ones where the evidence pulls in two directions.
Both studies add to previous research suggesting that combining a calcium scan with a PREVENT score gives clinicians more to work from than either method alone. The trials do not declare one tool superior across the board. For some patients, the calculator reading is enough. For others, the scan provides what the number cannot.
That the answer varies by patient is the finding both trials share.