PLASMA-LIPOPROTEINS AND PROGRESSION OF CORONARY-ARTERY DISEASE EVALUATED BY ANGIOGRAPHY AND CLINICAL EVENTS

Background. There is considerable evidence that remnants of triglyceride-rich lipoproteins may be particularly atherogenic. Methods and Results. Levels of lipoprotein lipids and of apolipoprotein B in low-density lipoproteins were measured in 335 men and women enrolled in a study in which quantitative coronary angiography was carried out at 2-year intervals. Clinical events related to coronary disease occurred in 129 patients during the trial and in the subsequent follow-up period of 4 to 6 years. In multivariate analysis controlled for a number of nonlipid risk factors, high-density lipoprotein cholesterol was inversely related to the mean percentage increase in coronary artery stenosis in both men and women. Neither plasma triglycerides nor low-density lipoprotein cholesterol, triglycerides, or apolipoprotein B was related to change in stenosis, but a measure of remnants of triglyceride-rich lipoproteins, which included cholesterol in intermediate-density lipoproteins, was directly related to lesion progression. The same relations for these measures of plasma lipoprotein concentrations were found to hold for clinical events related to coronary artery atherosclerosis. Conclusions. Zn patients with established coronary heart disease, increased levels of remnants of triglyceride-rich lipoproteins and decreased levels of high-density lipoproteins appear to promote progression of coronary artery atherosclerosis, which in turn may lead to an untoward clinical event. No such relation could be shown for the level of components of low-density lipoproteins. These and other observations call for reevaluation of relations between particular species of lipoproteins containing apolipoprotein B and the pathogenesis of coronary artery atherosclerosis and coronary heart disease.