{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T22:30:57Z","timestamp":1790721057483,"version":"4.1.0"},"reference-count":35,"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":[[2012,7]]},"abstract":"<jats:sec>\n            <jats:title>Background and Purpose\u2014<\/jats:title>\n            <jats:p>Angiographic vasospasm frequently complicates subarachnoid hemorrhage and has been implicated in the development of delayed cerebral ischemia. Whether large-vessel narrowing adequately accounts for the critical reductions in regional cerebral blood flow underlying ischemia is unclear. We sought to clarify the relationship between angiographic vasospasm and regional hypoperfusion.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods\u2014<\/jats:title>\n            <jats:p>\n              Twenty-five patients with aneurysmal subarachnoid hemorrhage underwent cerebral catheter angiography and\n              <jats:sup>15<\/jats:sup>\n              O-positron emission tomographic imaging within 1 day of each other (median of 7 days after subarachnoid hemorrhage). Severity of vasospasm was assessed in each intracranial artery, whereas cerebral blood flow and oxygen extraction fraction were measured in 28 brain regions distributed across these vascular territories. We analyzed the association between vasospasm and perfusion and compared frequency of hypoperfusion (cerebral blood flow &lt;25 mL\/100 g\/min) and oligemia (low oxygen delivery with oxygen extraction fraction \u22650.5) in territories with versus without significant vasospasm.\n            <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results\u2014<\/jats:title>\n            <jats:p>\n              Twenty-four percent of 652 brain regions were supplied by vessels with significant vasospasm. Cerebral blood flow was lower in such regions (38.6\u00b112 versus 48.7\u00b116 mL\/100 g\/min), whereas oxygen extraction fraction was higher (0.48\u00b10.19 versus 0.37\u00b10.14, both\n              <jats:italic>P<\/jats:italic>\n              &lt;0.001). Hypoperfusion was seen in 46 regions (7%), but 66% of these were supplied by vessels with no significant vasospasm; 24% occurred in patients without angiographic vasospasm. Similarly, oligemia occurred more frequently outside territories with vasospasm.\n            <\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusions\u2014<\/jats:title>\n            <jats:p>Angiographic vasospasm is associated with reductions in cerebral perfusion. However, regional hypoperfusion and oligemia frequently occurred in territories and patients without vasospasm. Other factors in addition to large-vessel narrowing must contribute to critical reductions in perfusion.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1161\/strokeaha.111.646836","type":"journal-article","created":{"date-parts":[[2012,4,6]],"date-time":"2012-04-06T05:38:10Z","timestamp":1333690690000},"page":"1788-1794","update-policy":"https:\/\/doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":97,"title":["Relationship Between Angiographic Vasospasm and Regional Hypoperfusion in Aneurysmal Subarachnoid Hemorrhage"],"prefix":"10.1161","volume":"43","author":[{"given":"Rajat","family":"Dhar","sequence":"first","affiliation":[{"name":"From the Departments of Neurology (R.D., M.T.S., A.R.Z., T.V., M.D.), Radiology (S.B., A.R.Z., T.V., M.D.), and Neurological Surgery (M.D.), Washington University School of Medicine, St Louis, MO."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael T.","family":"Scalfani","sequence":"additional","affiliation":[{"name":"From the Departments of Neurology (R.D., M.T.S., A.R.Z., T.V., M.D.), Radiology (S.B., A.R.Z., T.V., M.D.), and Neurological Surgery (M.D.), Washington University School of Medicine, St Louis, MO."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Spiros","family":"Blackburn","sequence":"additional","affiliation":[{"name":"From the Departments of Neurology (R.D., M.T.S., A.R.Z., T.V., M.D.), Radiology (S.B., A.R.Z., T.V., M.D.), and Neurological Surgery (M.D.), Washington University School of Medicine, St Louis, MO."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Allyson R.","family":"Zazulia","sequence":"additional","affiliation":[{"name":"From the Departments of Neurology (R.D., M.T.S., A.R.Z., T.V., M.D.), Radiology (S.B., A.R.Z., T.V., M.D.), and Neurological Surgery (M.D.), Washington University School of Medicine, St Louis, MO."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tom","family":"Videen","sequence":"additional","affiliation":[{"name":"From the Departments of Neurology (R.D., M.T.S., A.R.Z., T.V., M.D.), Radiology (S.B., A.R.Z., T.V., M.D.), and Neurological Surgery (M.D.), Washington University School of Medicine, St Louis, MO."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael","family":"Diringer","sequence":"additional","affiliation":[{"name":"From the Departments of Neurology (R.D., M.T.S., A.R.Z., T.V., M.D.), Radiology (S.B., A.R.Z., T.V., M.D.), and Neurological Surgery (M.D.), Washington University School of Medicine, St Louis, MO."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.3171\/jns.1985.62.4.0539"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1161\/strokeaha.107.484360"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1002\/ana.410140602"},{"key":"e_1_3_3_5_2","doi-asserted-by":"publisher","DOI":"10.1161\/strokeaha.106.477976"},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.STR.23.4.492"},{"key":"e_1_3_3_7_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.str.0000163090.59350.5a"},{"key":"e_1_3_3_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/S1474-4422(11)70108-9"},{"key":"e_1_3_3_9_2","doi-asserted-by":"publisher","DOI":"10.1097\/00004647-199804000-00010"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.1179\/174313209X393564"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1136\/jnnp.51.11.1457"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1227\/00006123-198001000-00001"},{"key":"e_1_3_3_13_2","doi-asserted-by":"publisher","DOI":"10.3171\/jns.1983.59.2.0223"},{"key":"e_1_3_3_14_2","doi-asserted-by":"publisher","DOI":"10.1161\/strokeaha.108.519942"},{"key":"e_1_3_3_15_2","doi-asserted-by":"publisher","DOI":"10.1097\/00004728-199401000-00023"},{"key":"e_1_3_3_16_2","first-page":"1614","article-title":"Performance evaluation of a whole-body PET scanner using the NEMA protocol","volume":"38","author":"Brix G","year":"1997","unstructured":"Brix G, Zaers J, Adam LE, Bellemann ME, Ostertag H, Trojan H , et al.. Performance evaluation of a whole-body PET scanner using the NEMA protocol. National Electrical Manufacturers Association. J Nucl Med. 1997;38:1614\u20131623.","journal-title":"J Nucl Med"},{"key":"e_1_3_3_17_2","doi-asserted-by":"publisher","DOI":"10.3171\/jns.2007.106.4.526"},{"key":"e_1_3_3_18_2","doi-asserted-by":"publisher","DOI":"10.1097\/00004728-199207000-00024"},{"key":"e_1_3_3_19_2","first-page":"790","article-title":"Brain blood flow measured with intravenous H2(15)O. II. Implementation and validation","volume":"24","author":"Raichle ME","year":"1983","unstructured":"Raichle ME, Martin WR, Herscovitch P, Mintun MA, Markham J. Brain blood flow measured with intravenous H2(15)O. II. Implementation and validation. J Nucl Med. 1983;24:790\u2013798.","journal-title":"J Nucl Med"},{"key":"e_1_3_3_20_2","doi-asserted-by":"publisher","DOI":"10.3171\/jns.2005.103.1.0025"},{"key":"e_1_3_3_21_2","doi-asserted-by":"publisher","DOI":"10.1161\/strokeaha.109.556159"},{"key":"e_1_3_3_22_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00259-003-1430-8"},{"key":"e_1_3_3_23_2","doi-asserted-by":"publisher","DOI":"10.1007\/BF03165003"},{"key":"e_1_3_3_24_2","doi-asserted-by":"publisher","DOI":"10.1038\/jcbfm.1991.143"},{"key":"e_1_3_3_25_2","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0404.2003.00174.x"},{"key":"e_1_3_3_26_2","doi-asserted-by":"publisher","DOI":"10.3171\/jns.1977.46.4.0446"},{"key":"e_1_3_3_27_2","doi-asserted-by":"publisher","DOI":"10.3171\/jns.1972.37.3.0302"},{"key":"e_1_3_3_28_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00234-009-0575-y"},{"key":"e_1_3_3_29_2","doi-asserted-by":"publisher","DOI":"10.1227\/01.NEU.0000058231.08870.1F"},{"key":"e_1_3_3_30_2","doi-asserted-by":"publisher","DOI":"10.1161\/01.STR.0000133132.76983.8e"},{"key":"e_1_3_3_31_2","doi-asserted-by":"publisher","DOI":"10.1161\/strokeaha.110.597005"},{"key":"e_1_3_3_32_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00234-008-0466-7"},{"key":"e_1_3_3_33_2","doi-asserted-by":"publisher","DOI":"10.3171\/jns.1985.62.1.0048"},{"key":"e_1_3_3_34_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00234-008-0416-4"},{"key":"e_1_3_3_35_2","first-page":"26","article-title":"Vasospasm after subarachnoid hemorrhage: utility of perfusion CT and CT angiography on diagnosis and management","volume":"27","author":"Wintermark M","year":"2006","unstructured":"Wintermark M, Ko NU, Smith WS, Liu S, Higashida RT, Dillon WP. Vasospasm after subarachnoid hemorrhage: utility of perfusion CT and CT angiography on diagnosis and management. AJNR Am J Neuroradiol. 2006;27:26\u201334.","journal-title":"AJNR Am J Neuroradiol"},{"key":"e_1_3_3_36_2","doi-asserted-by":"publisher","DOI":"10.1001\/archneurol.2010.226"}],"container-title":["Stroke"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.ahajournals.org\/doi\/full\/10.1161\/STROKEAHA.111.646836","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,5,13]],"date-time":"2024-05-13T14:31:31Z","timestamp":1715610691000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ahajournals.org\/doi\/10.1161\/STROKEAHA.111.646836"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2012,7]]},"references-count":35,"journal-issue":{"issue":"7","published-print":{"date-parts":[[2012,7]]}},"alternative-id":["10.1161\/STROKEAHA.111.646836"],"URL":"https:\/\/doi.org\/10.1161\/strokeaha.111.646836","relation":{},"ISSN":["0039-2499","1524-4628"],"issn-type":[{"value":"0039-2499","type":"print"},{"value":"1524-4628","type":"electronic"}],"subject":[],"published":{"date-parts":[[2012,7]]},"assertion":[{"value":"2011-12-01","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2012-02-27","order":1,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2012-04-05","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}