A comparison of HDL and LDL cholesterol for prevalent coronary calcification.

BACKGROUND: Coronary calcification is a marker for coronary atherosclerosis. It has been postulated that high levels of high density lipoprotein cholesterol (HDL-C) are associated with a reduced amount of atherosclerotic disease while previous reports have found a lack of association between low density lipoprotein cholesterol (LDL-C) and coronary calcification (CAC). The purpose of this study was to compare the correlation and predictive power of HDL-C with LDL-C for prevalent coronary calcification.
METHODS: A total of 6093 subjects were studied with respect to coronary calcification, serum cholesterol indices, personal health history and body morphology. Analyses consisted of correlation coefficients, logistic regression and sensitivity analysis to determine the strength of association between HDL-C and coronary calcification after controlling for covariates.
RESULTS: The correlation between HDL-C and coronary calcium score (CCS) was three times that of LDL-C. Individuals with an HDL-C level <40 mg/dl had significantly higher calcium scores while increases in HDL-C were associated with a significant reduction in risk for the presence of any calcified plaque. Results of multivariate logistic regression revealed that HDL-C is predictive of calcified plaque development independent of LDL-C. Sensitivities and positive predictive values for both HDL-C and LDL-C were low.
CONCLUSIONS: Increasing levels of HDL-C were associated with less coronary calcification and a smaller probability of having any calcified disease supporting the antiatherogenic hypothesis for HDL-C. HDL-C predicts the presence of any calcified atherosclerotic plaque independently of LDL-C. However, neither parameter seems suitable as a screening tool for predicting prevalent calcified atheromatous disease.