plaque regression and progenitor cell mobilization with intensive lipid elimination regimen (premier), phase ii

Conditions: Acute Coronary Artery Syndrome

Summary: 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 plaque volume in heart arteries of patients who have already suffered an 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 cardiovascular (cv) events in acs patients. this study has two phases and fda approval for phase ii has been received and all information has been updated to reflect premier phase ii.

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 four 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 40- 80mg dose of atorvastatin or equivalent statin; the smt group will only get 40-80mg atorvastatin or equivalent. patients will again undergo ivus-hs 12 weeks after enrollment to measure atheroma volume; epc level will also be checked. the three-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. the recent fda recommendations regarding the design of the study have been included in the revised study protocol: 1. the safety data will be submitted to the fda. 2. patients will be randomized to both ldl-apheresis and an oral daily dose of 40-80mg atorvastatin or equivalent statin (intensive ldl-lowering therapy/illt) or a daily dose of 40-80mg of atorvastatin or equivalent statin without ldl-apheresis (standard statin monotherapy/smt) following an uncomplicated pci.

Eligibility criteria:
inclusion criteria: * willing and able to provide informed consent (including hipaa) * age \>30 years * presenting with acute coronary syndrome (acs), manifested as unstable angina or non-st-elevation myocardial infarction * referred for clinically-indicated, non-emergent (the procedure is not required to be performed within 3 hours after patient presentation) coronary angiography and pci with intravascular ultrasound with virtual histology (ivus-vh) of target coronary artery for acs * successful placement of two large bore iv cannulas in bilateral upper extremities * fasting (12 hrs.) ldl 70mg/dl while on less than or equal to 80mg atorvastatin or equivalent dose of other statin, performed at time of admission or prior to pci. exclusion criteria: * known allergy to aspirin, clopidogrel, statins, or iodinated contrast * positive pregnancy test, planning to become pregnant, or breast-feeding * coexisting conditions that limit life expectancy to less than six months or affect patient compliance * uncontrolled fasting (12 hrs.) triglyceride levels ( 500mg/dl) * already participating in an investigational device or drug study * history of heparin induced thrombocytopenia (hit) * persons with estimated glomerular filtration rate (egfr) of less than 45 ml/min * st-elevation myocardial infarction at admission * abnormal liver function test (lft) at time of admission or prior to pci with abnormal lft defined as any liver transaminases (alt or ast) 3 times the upper limit of the normal laboratory reference * pre-pci or post-pci left ventricular ejection fraction \<25% by echo or cardiac catheterization done after admission * pre-pci, intra-pci, or post-pci hemodynamic instability with hypotension * pre-pci, intra-pci, or post-pci cardiac arrest * pre-pci or post-pci acute heart failure with or without pulmonary edema * intra-pci or post-pci sustained ventricular tachycardia * complicated pci, defined as pci with any of the vascular access complications (large hematoma with lump \> 5 cm or requiring medical treatment; arteriovenous (av) fistula; pseudo aneurysm requiring treatment; retroperitoneal bleeding), or pci with any of the procedural complications (abrupt vessel closure; no-reflow phenomenon; new angiographic thrombus; new major dissection with reduced flow; catheter-related thrombus), or pci requiring further medical treatments (urgent coronary artery bypass graft (cabg); endotracheal intubation; unplanned in-aortic balloon pump; left ventricular assist device (lvad); covered stent; unplanned temporary pacemaker wire; administration of inotropes; cardiopulmonary resuscitation (cpr)) , or pci resulting in clinical events (death; stroke; myocardial infarction; stent thrombosis) during or within 24 hours after the index pci * post-pci ongoing chest pain * post-pci severe groin pain and hematoma \> 5cm in diameter * persons whose hemoglobin is less than 9 grams following the index pci/ivus procedure, or who experience a drop in hemoglobin of greater than or equal to 2 grams following the procedure * not able to comply with study protocol as determined by the investigators

Keywords: plaque ldl statin endothelial apheresis acute coronary artery syndrome