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This study aimed to find the correlations between intramyocardial haemorrhage (IMH), myocardial infarction (MI), and myocardial oedema (ME) from small to large sizes of MI in a 7.0-T MR scanner.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Different\u00a0sizes of myocardial infarction were induced by occluding different sections of the proximal left anterior descending coronary artery (1\u20133\u00a0mm under the left auricle). T2*-mapping, T2-mapping and late gadolinium enhancement (LGE) sequences were performed on a 7.0\u00a0T MR system at Days 2 and 7. T2*- and T2-maps were calculated using custom-made software. All areas were expressed as a percentage of the entire myocardial tissue of the left ventricle. The rats were divided into two groups based on the T2* results and pathological findings; MI with IMH was referred to as the\u2009+\u2009IMH group, while MI without IMH was referred to as the \u2013IMH group.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The final experimental sample consisted of 25 rats in the\u2009+\u2009IMH group and 10 rats in the \u2013IMH group. For the\u2009+\u2009IMH group on Day 2, there was a significant positive correlation between IMH size and MI size (r\u2009=\u20090.677, P\u2009&lt;\u20090.01) and a positive correlation between IMH size and ME size (r\u2009=\u20090.552, P\u2009&lt;\u20090.01). On Day 7, there was a significant positive correlation between IMH size and MI size (r\u2009=\u20090.711, P\u2009&lt;\u20090.01), while no correlation was found between IMH size and ME size (r\u2009=\u20090.429, P\u2009=\u20090.097). The MI sizes of the\u2009+\u2009IMH group were larger than those of the \u2013IMH group (P\u2009&lt;\u20090.01).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Infarction size prior to reperfusion is a critical factor in determining IMH size in rats.\n<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40001-022-00834-5","type":"journal-article","created":{"date-parts":[[2022,10,28]],"date-time":"2022-10-28T22:02:31Z","timestamp":1666994551000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Myocardial infarction size as an independent predictor of intramyocardial haemorrhage in acute reperfused myocardial ischaemic rats"],"prefix":"10.1186","volume":"27","author":[{"given":"Rui","family":"Xia","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tong","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bo","family":"He","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yushu","family":"Chen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lei","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jichun","family":"Liao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie","family":"Zheng","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yongmei","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fajin","family":"Lv","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fabao","family":"Gao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2022,10,28]]},"reference":[{"key":"834_CR1","doi-asserted-by":"crossref","unstructured":"Calvieri C, Masselli G, Monti R, et al. 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