Progression of coronary artery calcium predicts all-cause mortality

Matthew J. Budoff, John E. Hokanson, Khurram Nasir, Leslee J. Shaw, Gregory L. Kinney, David Chow, Daniel Demoss, Vivek Nuguri, Vahid Nabavi, Raghu Ratakonda, Daniel S. Berman, Paolo Raggi

Research output: Contribution to journalArticlepeer-review

284 Scopus citations

Abstract

Objectives This study examined a large cohort to assess whether progression of coronary artery calcium (CAC) was associated with all-cause mortality, and which among 3 different methods to assess CAC progression provided the best estimate of risk. Background Serial assessment of CAC scores has been proposed as a method to follow progression of coronary artery disease, and it has been suggested that excessive CAC progression may be a useful noninvasive predictor of the patient's risk of future events. However, the optimal method to measure calcium progression has not been well established. Methods The study sample consisted of 4,609 consecutive asymptomatic individuals referred by primary physicians for CAC measurement with electron beam tomography, who underwent repeat screening. Three general statistical approaches were taken: 1) the absolute difference between follow-up and baseline CAC score; 2) percent annualized differences between follow-up and baseline CAC score; and 3) difference between square root of baseline and square root of follow-up CAC score >2.5 (the "SQRT method"). Results The average interscan time was 3.1 years, and there were 288 deaths. Progression of CAC was significantly associated with mortality regardless of the method used to assess progression (p < 0.0001). After adjusting for baseline score, age, sex, and time between scans, the best CAC progression model to predict mortality was the SQRT method (hazard ratio [HR]: 3.34; 95% confidence interval [CI]: 2.65 to 4.21; p < 0.0001), followed by a >15% yearly increase (HR: 2.98; 95% CI: 2.20 to 4.95; p < 0.0001). Progression was very limited and did not predict mortality in patients with baseline CAC = 0. Conclusions The CAC progression added incremental value in predicting all-cause mortality over baseline score, time between scans, demographics, and cardiovascular risk factors. Serial assessment may have clinical value in assessing plaque progression and future cardiovascular risk.

Original languageEnglish (US)
Pages (from-to)1229-1236
Number of pages8
JournalJACC: Cardiovascular Imaging
Volume3
Issue number12
DOIs
StatePublished - Dec 2010

Keywords

  • atherosclerosis progression
  • coronary artery calcium
  • mortality
  • outcomes

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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