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Use of pressure-wire to measure the index of microcirculatory resistance (IMR) is possible but has inevitable practical restrictions. We aimed to develop and validate angiography-derived index of microcirculatory resistance (IMR<jats:sub>angio<\/jats:sub>) as a novel and pressure-wire-free index to facilitate assessment of the coronary microcirculation. 45 STEMI patients treated with primary percutaneous coronary intervention (pPCI) were enrolled. Immediately before stenting and at completion of pPCI, IMR was measured within the infarct related artery (IRA). At the same time points, 2 angiographic views were acquired during hyperaemia to measure quantitative flow ratio (QFR) from which IMR<jats:sub>angio<\/jats:sub> was derived. In a subset of 15 patients both IMR and IMR<jats:sub>angio<\/jats:sub> were also measured in the non-IRA. Patients underwent cardiovascular magnetic resonance imaging (CMR) at 48\u00a0h for assessment of microvascular obstruction (MVO). IMR<jats:sub>angio<\/jats:sub> and IMR were significantly correlated (\u03c1: 0.85, p\u2009&lt;\u20090.001). Both IMR and IMR<jats:sub>angio<\/jats:sub> were higher in the IRA rather than in the non-IRA (p\u2009=\u20090.01 and p\u2009=\u20090.006, respectively) and were higher in patients with evidence of clinically significant MVO (&gt;\u20091.55% of left ventricular mass) (p\u2009=\u20090.03 and p\u2009=\u20090.005, respectively). Post-pPCI IMR<jats:sub>angio<\/jats:sub> presented and area under the curve (AUC) of 0.96 (CI95% 0.92\u20131.00, p\u2009&lt;\u20090.001) for prediction of post-pPCI IMR\u2009&gt;\u200940U and of 0.81 (CI95% 0.65\u20130.97, p\u2009&lt;\u20090.001) for MVO\u2009&gt;\u20091.55%. IMR<jats:sub>angio<\/jats:sub> is a promising tool for the assessment of coronary microcirculation. Assessment of IMR without the use of a pressure-wire may enable more rapid, convenient and cost-effective assessment of coronary microvascular function.<\/jats:p>","DOI":"10.1007\/s10554-020-01831-7","type":"journal-article","created":{"date-parts":[[2020,5,14]],"date-time":"2020-05-14T07:03:00Z","timestamp":1589439780000},"page":"1395-1406","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":134,"title":["Angiography-derived index of microcirculatory resistance as a novel, pressure-wire-free tool to assess coronary microcirculation in ST elevation myocardial infarction"],"prefix":"10.1007","volume":"36","author":[{"name":"Oxford Acute Myocardial Infarction (OXAMI) Study Investigators","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giovanni Luigi","family":"De Maria","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roberto","family":"Scarsini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mayooran","family":"Shanmuganathan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rafail A.","family":"Kotronias","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dimitrios","family":"Terentes-Printzios","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessandra","family":"Borlotti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeremy P.","family":"Langrish","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew J.","family":"Lucking","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robin P.","family":"Choudhury","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajesh","family":"Kharbanda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vanessa M.","family":"Ferreira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keith M.","family":"Channon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hector M.","family":"Garcia-Garcia","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adrian P.","family":"Banning","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,5,14]]},"reference":[{"issue":"25","key":"1831_CR1","doi-asserted-by":"publisher","first-page":"3129","DOI":"10.1161\/01.CIR.0000080700.98607.D1","volume":"107","author":"WF Fearon","year":"2003","unstructured":"Fearon WF, Balsam LB, Farouque HM, Caffarelli AD, Robbins RC, Fitzgerald PJ, Yock PG, Yeung AC (2003) Novel index for invasively assessing the coronary microcirculation. 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