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Multicentre, open-label, randomised controlled clinical trial to assess the efficacy and safety of appropriate target values for lipid management in patients who have mild-to-moderate stenotic lesions with high-risk plaques in coronary arteries: study protocol.

BMJ Open 2019 January 26
INTRODUCTION: To detect patients at high risk of developing myocardial infarction, plaque characteristics as well as the degree of stenosis in coronary arteries should be evaluated. However, unstable plaque or severe calcification detected via coronary artery CT (CACT) is not reflected in risk stratification according to current guidelines. It is hypothesised that patients with high-risk findings on CACT (even those without proven history of coronary artery diseases; CAD) should be strictly managed to lower their low-density lipoprotein cholesterol (LDL-C) levels to targets of secondary prevention. Currently, however, there is no evidence based on prospective randomised intervention studies to prove this hypothesis.

METHODS AND ANALYSIS: Patients with mild-to-moderate stenotic lesions with positive remodelling or severe calcification, but without any history of CAD, will be randomly allocated to group A (reduce LDL-C to <120~160 mg/dL according to the primary prevention criteria based on the Japan Atherosclerosis Society (JAS) Guideline for Prevention of Atherosclerotic Cardiovascular Diseases 2017) and group B (reduce LDL-C to <70 mg/dL according to the secondary prevention criteria for high risk based on the JAS Guideline). They will be strictly managed to achieve the LDL-C targets. We will follow-up and evaluate the composite endpoints consisting of major cardiovascular events (death from CAD, non-fatal myocardial infarction, operation for coronary revascularisation and stroke) and stenosis progression or new stenosis development for 3 years.

ETHICS AND DISSEMINATION: The study was approved by the National Hospital Organization Central Research Ethics Committee. The results of this study are scheduled to be published within 2 years after study completion via conference presentation or journal publication.

TRIAL REGISTRATION NUMBER: UMIN000031136.

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