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The purpose of this randomized, multi-site, clinical trial is to determine whether intensive therapy consisting of cholesterol-lowering statin drugs plus apheresis to cleanse the blood of low-density lipoprotein (LDL) cholesterol is more effective than statin therapy alone in reducing recurrent cardiovascular events (CV) in patients who have already suffered acute coronary syndrome (ACS). The study will also investigate whether this intensive approach can help increase the presence of endothelial progenitor cells (EPC), stem cells that have been shown to reduce CV events in ACS patients.
Using statins to lower blood cholesterol, and specifically LDL, is well established as a long-term strategy to reduce CVs and even death. But the most intensive pharmacologic lipid-lowering therapy with statins, though proven superior to standard dose regimens, is still associated with an unacceptably high rate of recurrent CV events early after an ACS. This study hypothesizes that for ACS patients undergoing percutaneous coronary intervention (PCI), intensive lipid-lowering therapy consisting of statins and LDL-apheresis (ILLT) will significantly reduce the total coronary atheroma volume of vulnerable plaque and augment mobilization of peripherally circulating EPC colony forming units, compared to guideline statin monotherapy (SMT). ILLT will lead to fewer CV events for these patients.
Patients presenting at two VA sites with ACS will be screened and consented before undergoing uncomplicated PCI (balloons or stents) and intravascular ultrasound with virtual histology (IVUS-HS). They will then be randomized into the ILLT arm or SMT arm of the study. The ILLT group will receive one treatment of LDL-apheresis plus a daily oral 80mg dose of Atorvastatin; the SMT group will only get the Atorvastatin. Patients will again undergo IVUS-HS 12 weeks after enrollment to measure atheroma volume; EPC level will also be checked.
The four-year duration of the study includes 24 months of accrual, six months of follow-up, and 12 months of study closure and data analysis. A two-sample t-test of mean difference with 90% power and 0.65 Cohen's D effect size provides a total sample size estimate of 102. Counting 20% drop-out rate, the sample size increases to 128.
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Outcomes Assessor), Primary Purpose: Prevention
Acute Coronary Syndrome
Percutaneous coronary intervention, Intravascular ultrasound with virtual histology, Atorvastatin, LDL-apheresis
Edward Hines, Jr. VA Hospital
Not yet recruiting
Department of Veterans Affairs
Published on BioPortfolio: 2014-08-27T03:18:20-0400
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