Abstract
The significance of microvessels within atherosclerotic plaques is not yet fully clarified. Associated with plaque vulnerability. The aim of this study is to examine tissue characteristics of plaque with microvessels detected by optical coherence tomography (OCT) by use of a commercially available color-coded intravascular ultrasound (IVUS) and coronary angioscopy (CAS). The subjects examined comprised of 44 patients with stable angina pectoris who underwent percutaneous coronary intervention. Microvessels were defined as a tiny tubule with a diameter of 50–300 µm detected over three or more frames in OCT. We compared the total volume of microvessels with tissue component such as fibrotic, lipidic, necrotic, and calcified volume and the number of yellow plaque. In IVUS analysis, % necrotic volume and % lipidic volume were significantly correlated and % fibrotic volume was inversely significantly correlated with the total volume of microvessel (r = 0.485, p = 0.0009; r = 0.401, p = 0.007; r = − 0.432, p = 0.003, respectively). The number of plaque with an angioscopic yellow grade of two or more was significantly correlated with the total volume of microvessel (r = 0.461, p = 0.002). The greater the luminal volume of microvessels, the more the percent content of necrotic/lipidic tissue volume within plaque and the more the number of yellow plaques. These data suggested that microvessels within coronary plaque might be related to plaque vulnerability.
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Hiro T and Hirayama A also work for Department of Advanced Cardiovascular Imaging, Nihon University School of Medicine, endowed by Boston Scientific Japan, Co. Ltd.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee (Nihon University Itabashi Hospital, Clinical Research Judging Committee, RK-160112–12) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Nishida, T., Hiro, T., Takayama, T. et al. Clinical significance of microvessels detected by in vivo optical coherence tomography within human atherosclerotic coronary arterial intima: a study with multimodality intravascular imagings. Heart Vessels 36, 756–765 (2021). https://doi.org/10.1007/s00380-020-01756-0
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DOI: https://doi.org/10.1007/s00380-020-01756-0