Key result
Plasma lipoprotein(a) and initial CAC score were positively correlated with the annual progression rate of coronary artery calcifications (r=0.42, p<0.01 and r=0.46, p<0.001, respectively).
Why the study?
Do cardiovascular risk factors such as lipoprotein(a) predict the progression of coronary artery calcifications in asymptomatic men at high cardiovascular risk?
Cohort (n=55)
Do cardiovascular risk factors such as lipoprotein(a) predict the progression of coronary artery calcifications in asymptomatic men at high cardiovascular risk?
Effect estimate: r = 0.42
p-value: p=<0.01
Elevated lipoprotein(a) and higher baseline CAC scores independently predict the progression of coronary artery calcification in asymptomatic high-risk men.
May identify predictors of CAC progression in asymptomatic men; leaves open whether targeting them improves outcomes.
Extended coronary artery calcifications (CAC) are predictive for cardiovascular complications but little is known about factors likely to influence CAC deposit. An analysis was undertaken to assess the cardiovascular risk factors that are capable of predicting CAC change over time. A retrospective analysis of CAC change was carried out in 55 asymptomatic men who underwent sequential electron beam computed tomographic measurement of CAC score a mean of 3.3 years apart. To ensure maximal accuracy in CAC change analysis, patients were included who had an initial CAC score of 10 or greater and with difference between both scores of 20% or greater of the initial score. The annual change rate in CAC score was calculated by dividing the change in CAC score by the interval between scores. Subjects' risk factors were analyzed and included body mass index, blood pressure, blood lipids and glucose, plasma lipoprotein(a) and fibrinogen, smoking status, and family history of coronary heart disease. The annual change rate in CAC score correlated positively with lipoprotein(a) (r = 0.42, p<0.01) and with initial CAC score (r = 0.46, p<0.001) and these associations persisted in multivariate analysis (p = 0.01, p = 0.001 respectively, R2 = 0.31). In contrast, no association existed between annual CAC change and baseline values and follow-up changes of other risk factors. The association of lipoprotein(a) with CAC progression in symptom-free patients with preexisting coronary calcifications provides new insights into the progression of coronary artery disease and may be useful for planning therapy and follow-up.
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Chironi et al. (2002) conducted a cohort in Coronary artery calcifications (n=55). Lipoprotein(a) and initial CAC score was evaluated on Annual change rate in CAC score (r = 0.42, p=<0.01). Plasma lipoprotein(a) and initial CAC score were positively correlated with the annual progression rate of coronary artery calcifications (r=0.42, p<0.01 and r=0.46, p<0.001, respectively).
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