Coronary artery calcium progression and all-cause mortality

Area of Science:

• Cardiology
• Preventive Medicine
• Medical Imaging

Background:

• Coronary artery calcium (CAC) is a noninvasive marker for atherosclerotic burden and cardiovascular event risk.
• Previous studies indicated CAC progression predicts all-cause mortality, but quantification was needed.

Purpose of the Study:

• To quantify the association between annualized CAC progression and all-cause mortality.
• To identify a specific threshold of CAC progression indicative of increased mortality risk.

Main Methods:

• A cohort of 3260 individuals (aged 30-89) with initial and follow-up CAC scans (≥12 months apart) were analyzed.
• Receiver operator characteristic (ROC) curves determined the optimal CAC progression threshold for mortality prediction.
• Cox proportional hazards models assessed the association between annualized CAC progression and mortality, adjusting for cardiovascular risk factors.

Main Results:

• The average follow-up period was 4.7 years between scans and 9.1 years overall.
• An annualized CAC progression of 20 units demonstrated optimal sensitivity (58%) and specificity (82%) in ROC analysis.
• Annualized CAC progression >20 units was significantly associated with all-cause mortality (HR 1.84, 95% CI 1.28-2.64, P=0.001) after multivariate adjustment.

Conclusions:

• Annualized CAC progression exceeding 20 units per year is a significant predictor of all-cause mortality.
• This metric can enhance clinical decision-making for patient surveillance and treatment intensity.