Effect of Ezetimibe Plus Simvastatin on Flow-Mediated Brachial Artery Vasoactivity in Subjects With Primary Hypercholesterolemia (Study P03336)

Condition(s) targeted: Hypercholesterolemia; Atherosclerosis

Intervention: Ezetimibe + Simvastatin (Drug); Simvastatin (Drug); Placebo (Drug)

Phase: Phase 3

Status: Terminated

Sponsored by: Schering-Plough

The purpose of this study is to evaluate the effect of ezetimibe coadministered with simvastatin compared with simvastatin alone when administered for 12 weeks on endothelial function as assessed by brachial artery reactivity testing (BART) using high-frequency ultrasound to image the brachial artery vasomotor response to a flow-mediated stimulus (high-shear stress) in subjects with high cholesterol. The secondary objectives include evaluation of nitroglycerin-induced vasodilation. In addition, lipid parameters (low-density-lipoprotein cholesterol [LDL-C], high-density-lipoprotein cholesterol [HDL-C], triglycerides [TG], total cholesterol [TC]) and C reactive protein (CRP) will be assessed by treatment group.

Official title: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Study of the Effect of Ezetimibe Plus Simvastatin Compared With Simvastatin Alone on Flow-Mediated Brachial Artery Vasoactivity in Subjects With Primary Hypercholesterolemia (The EFFECTS Trial)

Study design: Basic Science, Randomized, Double Blind (Subject, Investigator, Outcomes Assessor), Placebo Control, Parallel Assignment, Efficacy Study

Primary outcome: Change from baseline to endpoint in flow-mediated vasodilation: percent change in the mean diameter between 1-minute, post-cuff release diameter and image obtained prior to cuff application.

Secondary outcome:

Change from baseline to endpoint in NTG-induced vasodilation: percent change in the diameter between the post-NTG and pre-NTG diameters.

Changes from baseline to endpoint in LDL-C, HDL-C, TG, TC, and CRP.

Minimum age: 18 Years. Maximum age: N/A. Gender(s): Both.

Criteria:

Inclusion Criteria:

- Adults (18 years old and older) with primary hypercholesterolemia with a plasma LDL-C

>=145 mg/dL and <=250 mg/dL, and plasma TG <=350 mg/dL after adequate drug washout.

- Postmenopausal women who are receiving postmenopausal hormonal therapy or raloxifene

must be maintained on a stable hormone replacement therapy (HRT) or raloxifene regimen for at least 6 weeks prior to study entry and throughout the study period.

- All subjects must agree to refrain from drinking alcohol or caffeine containing

beverages for 12 hours prior to each study visit at which a BART assessment is performed; be minimally active (eg, avoid excessive physical activity) for 12 hours prior to each study visit at which a BART assessment is performed; and be willing to observe the NCEP Step I diet, participate in the study, and complete all study-related procedures.

Exclusion Criteria:

- Pregnancy or any other situation, condition, or illness that, in the opinion of the

investigator, may interfere with optimal participation in the study

- Smoking, excessive alcohol consumption, underlying disease likely to limit life span

to less than one year, or known hypersensitivity or any contraindication to simvastatin, ezetimibe, or nitroglycerin

- Existing hypercholesterolemia for which withholding approved lipid-lowering therapy

for the duration of the study would be inappropriate

- The following concomitant illnesses: congestive heart failure NYHA Class III or IV;

obstructive cardiomyopathy; uncontrolled cardiac arrhythmias; severe aortic stenosis; upper severe aortic stenosis; MI, CABG, or angioplasty within 6 months of study entry; uncontrolled hypertension; unstable or severe peripheral artery disease within 3 months of study entry; unstable angina pectoris; disorders of the hematologic, digestive or central nervous systems including cerebrovascular disease and degenerative disease that would limit study evaluation or participation; uncontrolled or newly diagnosed (within one month of study entry) diabetes mellitus; uncontrolled endocrine or metabolic disease known to influence serum lipids or lipoproteins (clinically euthyroid subjects on stable replacement doses of thyroid hormone are eligible for enrollment); known impairment of renal function (plasma creatinine >2. 0 mg/dL), dysproteinemia, nephrotic syndrome or other renal disease (24-hour urinary protein 3+ or 1 gram); hepatobiliary or hepatic disease (subjects with AST or ALT >2 times the upper limit of reference range will be excluded); HIV positive; and known coagulopathy.

- Use of certain drugs, foods, or other agents known to alter lipid levels or to cause

interactions with either ezetimibe or simvastatin

Starting date: October 2003
Ending date: September 2004
Last updated: March 31, 2008