Relation of high-density lipoprotein cholesterol:apolipoprotein a-I ratio to progression of coronary atherosclerosis in statin-treated patients.

High-density lipoprotein cholesterol (HDL-C) and apolipoprotein A-I (apoA-I) levels are inversely associated with adverse cardiovascular outcomes. Associations between these HDL-C-related measurements and coronary plaque progression have not been studied. We performed a retrospective analysis of 2,566 statin-treated patients with angiographic coronary artery disease who underwent serial evaluation of atheroma burden with intravascular ultrasound. Relations between achieved levels of HDL-related measurements with clinical characteristics and changes in plaque burden were determined. A strong correlation between HDL-C and apoA-I (r = 0.80, p <0.001) was observed. HDL-C, apoA-I, and the HDL-C:apoA-I ratio demonstrated negative correlations with the change in percent atheroma volume and total atheroma volume (all p ≤0.001). Increasing levels of achieved HDL-C:apoA-I (p = 0.04), but not HDL-C (p = 0.18) or apoA-I (p = 0.67), were associated with less progression of percent atheroma volume. Similar results were seen for change in total atheroma volume, with less progression seen with increased HDL-C:apoA-I (p = 0.002) but not with increases in HDL-C (p = 0.09) or apoA-I (p = 0.19). In conclusion, increasing levels of HDL-C:apoA-I associated with less progression of coronary atherosclerosis. This suggests that interventions increasing the cholesterol content of HDL particles may be of cardiovascular benefit.