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This study sought to investigate the role of intravascular ultrasonography (IVUS) in the rectification of angiographically judged RI.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>This study retrospectively analyzed 165 patients who were reported to have an RI based on CAG and underwent IVUS implementation from 02\/01\/2009 to 31\/12\/2019 in Zhongshan Hospital, Fudan University. Taking IVUS as the gold standard, we calculated the accuracy of RI identification by CAG and evaluated the impact of RI on revascularization strategy.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Among the 165 patients, 89 patients (54%) were demonstrated to have an RI on IVUS (IVUS-RI), 32 patients (19%) were identified to have a high-origin diagonal branch on IVUS (IVUS-h-D), and 44 patients (27%) had an actual high-origin obtuse marginal artery on IVUS (IVUS-h-OM). Among 84 patients who underwent one-stent crossover stenting because of left main furcation lesions (48 patients in the IVUS-RI group, 12 patients in the IVUS-h-D group, and 24 in the IVUS-h-OM group), 14.6% of patients in the IVUS-RI group, 33.3% in the IVUS-h-D group and 0% in the IVUS-h-OM group had CAG-RI compromise (<jats:italic>P<\/jats:italic>\u2009=\u20090.02), which was defined as severe stenosis of the RI ostium (&gt;\u200975%) or significant RI flow impairment (TIMI\u2009&lt;\u20093).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Only 54% of CAG-RIs were confirmed by IVUS, which indicates the necessity of preintervention IVUS to distinguish real RIs from other branches in LM furcation lesions.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12872-021-02034-1","type":"journal-article","created":{"date-parts":[[2021,4,30]],"date-time":"2021-04-30T05:02:28Z","timestamp":1619758948000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Role of IVUS in the rectification of angiographically judged ramus intermedius and its clinical significance"],"prefix":"10.1186","volume":"21","author":[{"given":"Xue","family":"Gong","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zheyong","family":"Huang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhonghan","family":"Sun","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qibing","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Juying","family":"Qian","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lei","family":"Ge","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junbo","family":"Ge","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,4,30]]},"reference":[{"issue":"6","key":"2034_CR1","doi-asserted-by":"publisher","first-page":"1665","DOI":"10.2214\/AJR.06.1295","volume":"188","author":"S Kini","year":"2007","unstructured":"Kini S, Bis KG, Weaver L. 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The Ethics Committee of Zhongshan Hospital affiliated with Fudan University had approved the work and received all the written informed consent. All methods were performed in accordance with the relevant\u00a0guidelines and regulations.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"All authors declare that they have no competing financial interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"218"}}