Coronary Artery Disease Clinical Trial
Official title:
Synergy Between morpHOlogical and inflammatoRy Evaluation in Predicting Long-term Coronary Plaque Progression
Data from human autopsy studies have showed that thrombosis of a ruptured plaque with a large necrotic core, inflammatory cells and a thin fibrous cap, the so-called thin cap fibroatheroma (TCFA), represents the main mechanism for acute coronary syndrome (ACS). Optical coherence tomography (OCT) is an imaging technique that provides high-resolution, cross-sectional images of tissue in situ. The resolution of OCT (10 um) is appropriate for measuring a cap thickness less than65 μm, and even the plaque macrophage density. 68Ga-DOTA-(Tyr3)-octreotate/NaI3-octreotide(68Ga-DOTA-TATE/NOC) Positron Emission Tomography (PET)/Computed Tomography coronary angiography (CTCA), targeting the somatostatin receptor subtype-2 selectively expressed by M1 macrophages may show coronary inflammation. The SHORE protocol aims at evaluating the synergy between OCT and 68Ga-DOTA-TATE/NOC in predicting coronary plaque progression as assessed by CTCA
ACS are the leading cause of mortality and morbidity in the western world. Despite recommended therapies, after experiencing an ACS episode patients still have an increased cardiovascular risk during follow up. In the CLIMA study OCT criteria of plaque vulnerability at non-culprit sites such as minimum luminal area <3.5mm2, fibrous cap thickness <75 µm, lipid arc extension >180° and macrophage infiltration was associated with an increased risk of cardiac death and myocardial infarction (HR 7.54, 95%CI 3.1-18.6). Of the 36 OCT defined vulnerable plaques only 7 were associated with events showing a very low positive predictive value (19%). Yet, among the 577 plaques with macrophages accumulation only the 5.2% was associated with the endpoint. The lack of reliable information on plaque inflammation could represent the miss point to better link high risk plaques to plaque progression and/or rupture. Recent studies showed that inflammation in coronary plaques may be measured by means 68Ga-DOTATATE/PET targeting the somatostatin receptor subtype-2 selectively expressed by M1 macrophages. Thus the investigators aim to evaluate the in vivo natural history of coronary plaques characterized from both the morphological (OCT) and inflammatory (68Ga-DOTATATE PET/CTCA) point of view in patients with ACS and at least 1 intermediated coronary lesion as assessed by FFR/iFR ;
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