Coronary Artery Calcium Scoring and Long-Term Mortality in Asymptomatic Hypertensive Patients

This prospective cohort study followed 8,905 asymptomatic individuals undergoing coronary artery calcium (CAC) scoring at a single high-volume center over a median follow-up of approximately 15 years, characterizing the relationship between CAC score and long-term all-cause and cardiovascular mortality.

CAC score was a strong independent predictor of long-term mortality across the entire spectrum of risk. Individuals with CAC=0 had an event rate so low — cardiovascular mortality <1% over 15 years — that the investigators characterized it as a “15-year warranty period” for low cardiovascular risk, supporting deferral of lipid-lowering and other preventive therapies in truly zero-calcium individuals.

Mortality increased monotonically with CAC score: those with CAC >1,000 had mortality rates several-fold higher than CAC=0 individuals after risk factor adjustment. The CAC score’s predictive power exceeded traditional Framingham Risk Score-based risk prediction for long-term outcomes.

The “warranty period” framing — borrowed from engineering reliability concepts — is clinically useful for communicating the very low risk associated with CAC=0 to patients. It has been influential in guideline development, particularly in supporting CAC=0 as a decision anchor for deferring statin initiation in intermediate-risk primary prevention patients (the ACC/AHA 2019 guideline recommendation).

We rate the evidence strong. A large prospective cohort study in 8,905 patients over 15 years establishing that CAC=0 confers an approximately 15-year warranty period of very low cardiovascular mortality — foundational evidence for CAC=0 as a clinically actionable low-risk signal.