Abstract 366: Gender Differences Exist in Carotid Arterial Plaque Composition Among Men and Women with Carotid or Coronary Artery Disease and Elevated ApoB Levels

Introduction: Postmortem coronary artery histopathology and post-surgical carotid endarterectomy studies demonstrate that women have less calcification and inflammatory cells, but more smooth muscle cells than men. Gender differences in atherosclerotic plaque composition are not well known. Yet, the age-adjusted incidence of stroke and myocardial infarction are higher in men than women. Hypothesis: We hypothesized that gender differences exist in carotid plaque composition (CPC), % lipid rich necrotic core (LRNC) and % wall volume (PWV), comparing living women and men. Methods: The CPC study is a prospective, randomized study evaluating the effect of 1) atorvastatin + placebo + placebo vs 2) atorvastatin + niacin ER + placebo 3) atorvastatin + niacin ER + colsevelam on CPC. Participants had coronary or carotid artery disease and ApoB levels ≥120 mg/dL. CPC was evaluated using MRI. Baseline PWV [(wall volume/total vessel volume) х 100%], a measure of plaque burden that adjusts for variation in artery size,...