Safety and Efficacy of Everolimus - Eluting Bioresorbable Vascular Scaffold for Cardiac Allograft Vasculopathy

The CART Pilot study was designed to provide preliminary observations (about performance and safety) and generate hypotheses for future studies . The primary goal of the study is to evaluate the performance at one year of second-generation ABSORB Bioresorbable Vascular Scaffold (BVS)(Abbott Vascular, Santa Clara, CA , USA), the Everolimus Eluting Bioresorbable Vascular Scaffold, in heart transplant recipients affected by cardiac allograft vasculopathy (CAV) and significative coronary stenosis. The secondary objectives are: * to collect data about the procedural and clinical outcomes post-procedure , 30 days, 180 days and at 1,2 and 3-year follow-up, of patients who underwent ABSORB BVS implantation in order to investigate the safety of the device in CAV population; * to evaluate the progression of the disease and the its interactions with the study device by using data derived from multi-imaging invasive techniques. The vascular reparative therapy and in particular the BVS technology showing important advantages in terms of endothelial preservation, adequate vasomotion, and restoration of the media and adventitia of the vessel wall, could represent a new and more effective therapeutic option, compared to bare-metal and drug-eluting stent technologies, for transplanted patients, since all these mechanisms may, at least in part, counteract the detrimental changes leading to CAV, namely constrictive remodeling and rapid atherosclerosis progression. Subjects enrolled into the clinical study will be male or female derived from the heart transplant recipients population of every participating center. The clinical study will enroll 30 subjects. Subjects, who underwent the yearly expected coronary angiography follow-up after heart transplant surgery, meeting the general and angiographic inclusion and exclusion criteria (eligibility will be assessed by Heart Team consensus) will be asked to sign an informed consent form. Subjects who do not meet inclusion and exclusion c