Lipoprotein(a) interactions with lipid and non-lipid risk factors in patients with early onset coronary artery disease - Results from the NHLBI Family Heart Study

Background: A positive interaction between high plasma lipoprotein(a) [Lp(a )] and unfavorable plasma lipid levels has been reported to result in very high risk for premature coronary artery disease (CAD). We further examined this issue for men and women with early onset CAD. We also examined potenti al interactions between Lp(a) and non-lipid risk factors. Methods and resul ts: In 338 men and women with early onset CAD (most with a positive family history of early CAD) and 480 general population controls, we measured Lp(a ), lipids and other risk factors. In univariate analysis, relative odds for CAD was 1.7 (P = 0.002) for plasma Lp(a) > 50 mg/dl. Elevated Lp(a) level was found to interact with adjusted plasma total/high density lipoprotein ( HDL) cholesterol such that when Lp(a) was over 50 mg/dl and adjusted plasma total/HDL cholesterol > 5.8, relative odds for CAD were 8.0-9.6 (P < 0.000 1) in multiple logistic regression. Non-lipid risk factors were generally f ound to multiply the risk associated with Lp(a) (as predicted by logistic r egression) without evidence for interaction. Conclusions: We find evidence that Lp(a) does interact positively with adjusted plasma total/HDL choleste rol ratio. Aggressive risk factor intervention, especially for lipids, in t hose with elevated Lp(a) therefore appears indicated. (C) 1998 Elsevier Sci ence Ireland Ltd. All rights reserved.