{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,7]],"date-time":"2026-07-07T18:08:49Z","timestamp":1783447729203,"version":"3.55.0"},"reference-count":32,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"7","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["Stroke"],"published-print":{"date-parts":[[1999,7]]},"abstract":"<jats:p>\n            <jats:italic>Background and Purpose<\/jats:italic>\n            \u2014We sought to investigate the relation between collateral flow via different pathways and hemodynamic parameters measured by dynamic susceptibility contrast\u2013enhanced MRI in patients with severe carotid artery disease.\n          <\/jats:p>\n          <jats:p>\n            <jats:italic>Methods<\/jats:italic>\n            \u2014Dynamic susceptibility contrast\u2013enhanced MRI was performed in 66 patients and 33 control subjects. Patients had severe stenosis (&gt;70%, n=12), unilateral occlusion (n=38), or bilateral occlusion (n=16) of the internal carotid artery (ICA). Cerebripetal flow and collateral flow via the circle of Willis were investigated with MR angiography. Collateral flow via the ophthalmic artery was investigated with transcranial Doppler sonography.\n          <\/jats:p>\n          <jats:p>\n            <jats:italic>Results<\/jats:italic>\n            \u2014Patients with ICA stenosis had well-preserved cerebral perfusion and were in general not dependent on collateral supply. Patients with unilateral ICA occlusion had impaired cerebral perfusion. However, appearance time, peak time, and mean transit time in white matter were less increased in patients with than in patients without collateral flow via the circle of Willis (\n            <jats:italic>P<\/jats:italic>\n            &lt;0.05). Furthermore, patients with collateral flow via both anterior and posterior communicating arteries had less increased regional cerebral blood volume than patients with collateral flow via the posterior communicating artery only (\n            <jats:italic>P<\/jats:italic>\n            &lt;0.05). Patients with bilateral ICA occlusion had severely compromised hemodynamic status despite recruitment of collateral supply.\n          <\/jats:p>\n          <jats:p>\n            <jats:italic>Conclusions<\/jats:italic>\n            \u2014In patients with unilateral ICA occlusion, the pattern of collateral supply has significant influence on hemodynamic status. Collateral flow via the anterior communicating artery is a sign of well-preserved hemodynamic status, whereas no collateral flow via the circle of Willis or flow via only the posterior communicating artery is a sign of deteriorated cerebral perfusion.\n          <\/jats:p>","DOI":"10.1161\/01.str.30.7.1432","type":"journal-article","created":{"date-parts":[[2011,6,17]],"date-time":"2011-06-17T20:08:03Z","timestamp":1308341283000},"page":"1432-1439","update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":134,"title":["Cerebral Hemodynamics in Relation to Patterns of Collateral Flow"],"prefix":"10.1161","volume":"30","author":[{"given":"M.","family":"Kluytmans","sequence":"first","affiliation":[{"name":"From the Department of Radiology, Image Sciences Institute (M.K., J. van der G., K.J. van E., M.A.V.), and Department of Neurology, University Hospital Utrecht (C.J.M.K., L.J.K.), Utrecht, Netherlands."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"van der Grond","sequence":"additional","affiliation":[{"name":"From the Department of Radiology, Image Sciences Institute (M.K., J. van der G., K.J. van E., M.A.V.), and Department of Neurology, University Hospital Utrecht (C.J.M.K., L.J.K.), Utrecht, Netherlands."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. J.","family":"van Everdingen","sequence":"additional","affiliation":[{"name":"From the Department of Radiology, Image Sciences Institute (M.K., J. van der G., K.J. van E., M.A.V.), and Department of Neurology, University Hospital Utrecht (C.J.M.K., L.J.K.), Utrecht, Netherlands."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. J. M.","family":"Klijn","sequence":"additional","affiliation":[{"name":"From the Department of Radiology, Image Sciences Institute (M.K., J. van der G., K.J. van E., M.A.V.), and Department of Neurology, University Hospital Utrecht (C.J.M.K., L.J.K.), Utrecht, Netherlands."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L. 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