{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T19:13:19Z","timestamp":1779304399588,"version":"3.51.4"},"reference-count":17,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[2018,6,13]],"date-time":"2018-06-13T00:00:00Z","timestamp":1528848000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"name":"The County of V\u00e4sterbotten"},{"name":"the fund for neurological research at Ume\u00e5 University Hospital"},{"name":"the Swedish stroke fund"},{"name":"Swedish research medical association"},{"name":"the Northern Sweden Stroke fund"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Acta Radiol"],"published-print":{"date-parts":[[2019,3]]},"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Most carotid near-occlusions are indistinguishable from conventional\u2009\u2265\u200950% stenosis on ultrasound, demonstrating high peak systolic velocity (PSV) in the stenosis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>To study whether the velocity distal to the stenosis can separate high PSV near-occlusion from conventional\u2009\u2265\u200950% stenosis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Material and Methods<\/jats:title>\n                    <jats:p>We included patients with\u2009\u2265\u200950% carotid stenosis with high PSV (\u2265125\u2009cm\/s), examined with both computed tomography angiography (CTA) and ultrasound within 30 days, and a distal velocity measurement was performed. Based on CTA, cases were divided into three groups: conventional stenosis; near-occlusion without full collapse (NwoC; normal-appearing albeit small distal artery); and near-occlusion with full collapse (NwC; threadlike distal artery). Distal Doppler ultrasound flow velocities were compared between these groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Sixty patients were included: 33 patients with conventional stenosis; 20 patients with NwoC; and seven patients with NwC. Mean distal PSV was 93, 63, and 21\u2009cm\/s ( P\u2009&lt;\u20090.001) and mean distal end-diastolic velocity was 30, 24, and 5\u2009cm\/s ( P\u2009&lt;\u20090.001), respectively. A distal PSV\u2009&lt;\u200950\u2009cm\/s was 63% sensitive and 94% specific for separating both types of near-occlusion from conventional stenosis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>In high PSV carotid stenoses, the distal velocity was lower in near-occlusions than conventional carotid stenosis. Distal velocities warrant further investigation in diagnostic studies.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/0284185118780900","type":"journal-article","created":{"date-parts":[[2018,6,13]],"date-time":"2018-06-13T06:23:37Z","timestamp":1528871017000},"page":"396-404","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":17,"title":["Carotid near-occlusion can be identified with ultrasound by low flow velocity distal to the stenosis"],"prefix":"10.1177","volume":"60","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5317-4563","authenticated-orcid":false,"given":"Elias","family":"Johansson","sequence":"first","affiliation":[{"name":"Department of Pharmacology and Clinical Neuroscience, Ume\u00e5 University, Ume\u00e5, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hadas","family":"Benhabib","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wendy","family":"Herod","sequence":"additional","affiliation":[{"name":"Vascular Lab, Sunnybrook Health Sciences Centre, Department of Surgery, University of Toronto, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julia","family":"Hopyan","sequence":"additional","affiliation":[{"name":"Department of Neurology, Sunnybrook Health Sciences Centre, Department of Medicine, University of Toronto, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Matylda","family":"Machnowska","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Robert","family":"Maggisano","sequence":"additional","affiliation":[{"name":"Department of Vascular Surgery, Sunnybrook Health Sciences Centre, Department of Surgery, University of Toronto, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard","family":"Aviv","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5465-5801","authenticated-orcid":false,"given":"Allan J","family":"Fox","sequence":"additional","affiliation":[{"name":"Department of Medical Imaging, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2018,6,13]]},"reference":[{"key":"bibr1-0284185118780900","first-page":"2086","volume":"26","author":"Fox AJ","year":"2005","journal-title":"Am J 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