Impact of Vascular Reparative Therapy on Vasomotor Function and Myocardial Perfusion:a Randomized H215O PET/CT Study

Study Overview
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Brief Summary
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The purpose of this study is to examine the improvement of myocardial blood flow induced by regained vasomotor functions of the stented coronary segment after resorption of BVS over time.

Detailed Description
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Objective The objective of the proposed study is to determine the impact of VRT, in comparison with conventional drug-eluting stenting, on endothelium dependent vasodilation and maximal hyperemic myocardial perfusion using H215O PET. Study design The study is designed as a single center single-blind randomized clinical trial and will be conducted at the VU University Medical Center in Amsterdam. Summary of the study design It is hypothesized that VRT will result in augmented endothelium dependent coronary vasodilation and maximal myocardial perfusion as compared with conventional stenting of a coronary lesion. Within one year sixty patients (age 18-65) with documented single vessel CAD (type A or B1 lesion) accepted for PCI based on clinical grounds and according to current international guidelines, will be asked to participate in this trial. Patients will be randomized to implantation of a drug-eluted stent (Xience Prime) or BRS (Absorb). The patients will be blinded to the nature of the implanted device. H2 15O PET will be performed one month (reference scan), one year, and three years after the PCI procedure (resolution of BRS is generally complete within a three year period). The PET protocol will consist of three MBF measurements: resting MBF, during endothelial dependent vasodilation provoked by coldpressor-testing (CPT), and during (endothelial dependent and independent) maximal vasodilation by infusion of adenosine intravenously. After three years a control invasive coronary angiogram will document any potential obstructive coronary lesions that may affect the MBF measurements. Primary study parameters/outcome of the study MBF measurements: resting MBF, during endothelial dependent vasodilation provoked by cold-pressor-testing (CPT), and during (endothelial dependent and independent) maximal vasodilation by infusion of adenosine intravenously Secondary study parameters/outcome of the study Obstructive coronary lesions on control invasive coronary angiogram that may affect the MBF measurements.

Official Title
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Impact of Vascular Reparative Therapy on Vasomotor Function and Myocardial Perfusion: a Randomized H215O PET/CT Study

Conditions
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Coronary Artery Disease

Intervention / Treatment
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* Device: Bioresorbable vascular scaffold
* Device: Xience Prime


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with documented obstructive CAD by invasive coronary angiography resulting in myocardial ischemia (either documented by invasive (i.e. fractional flow reserve, FFR) or noninvasive imaging techniques (e.g. exercise ECG, myocardial perfusion imaging, or inducibility of wall motion abnormalities during dobutamine stress). Presence of a single, de-novo lesion in a native coronary artery (type A or B1), with a reference vessel diameter of at least 3.0 mm and a diameter stenosis of 50% or more and less than 100%, with a thrombolysis in myocardial infarction (TIMI) flow grade of at least 2. Coronary lesion must be amendable for successful treatment with one of the following BRS device dimensions: length 18 or 28 mm, diameter 3.0 or 3.5 mm. Exclusion Criteria: age of 65 or above refusal or inability to provide written informed consent other than single CAD abnormal echocardiographic findings (i.e. wall motion abnormalities, ventricular hypertrophy, valvular disease etc.) complex coronary lesion characteristics (e.g. lesions located in the left main coronary artery, lesions involving a side branch more than 2 mm in diameter, and the presence of thrombus or another clinically significant stenosis in the target vessel) poor kidney function defined as an eGFR < 30 ml/min astma or chronic obstructive pulmonary disease other than sinus rhythm pregnancy bail out stenting after placement of the study device

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: Bioresorbable vascular scaffold<br>Paritcipants will receive a bioresorbable vascular scaffols (BVS) | Device: Bioresorbable vascular scaffold<br>* Drug eluting coronary stent, resorbable in 2-3 years<br>|
| Active Comparator: Xience Prime<br>Participant will receive a Xience Prime stent | Device: Xience Prime<br>* Drug eluting metallic stent<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Evaluation of Myocardial Blood Flow over time | Endothelial dependent vasomotor function and effect on myocardial perfusion | Three years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Restenosis | Obstructive coronary lesions and lumen dimensions on control invasive coronary angiogram that may affect the MBF measurements | Three years | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Coronary Artery Disease (CAD), Invasive coronary angiography (ICA), Positron Emission Tomography (PET)