RecruitingPhase 3Drug trialA Study to See if Lepodisiran Can Reduce Plaque in Coronary Arteries of Adults With Elevated Lp(a) Who Have Had Heart Events or Are at High RiskLipoprotein(a), also known as Lp(a), is a protein that carries cholesterol and proteins in your blood. People with high Lp(a) have a higher risk for heart disease. The main purpose of the study is to investigate how lepodisiran, compared to a placebo, affects the amount and type of plaque in the heart's vessels using an imaging technology known as Coronary Computed Tomography Angiography (CCTA) in adults who have high levels of Lp(a). Participation will last about 120 weeks.