Question 344
{"accessible":false,"alternatives":[{"id":1694,"text":"prolonged mean transit time (MTT) and near normal cerebral blood volume (CBV)"},{"id":1695,"text":"prolonged mean transit time (MTT) and reduced cerebral blood volume (CBV)"},{"id":1696,"text":"reduced mean transit time (MTT) and near normal cerebral blood volume (CBV)"},{"id":1697,"text":"reduced mean transit time (MTT) and reduced cerebral blood volume (CBV)"}],"archived":false,"correctAlternativeId":1694,"explanation":"\u003cp\u003eThe ischaemic penumbra, which in most cases surrounds the infarct core, also has prolonged MTT or Tmax but in contrast has only moderately reduced CBF and, importantly, near normal or even increased CBV (due to autoregulatory vasodilatation).\u0026nbsp;\u003c/p\u003e","id":344,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1768","nextQuestionPath":"/articles/ischaemic-penumbra/questions/343","relatedArticles":[{"id":13437,"title":"Ischaemic stroke","link":"/articles/ischaemic-stroke?lang=gb"},{"id":24523,"title":"Infarct core","link":"/articles/infarct-core?lang=gb"},{"id":24526,"title":"CT perfusion in ischaemic stroke","link":"/articles/ct-perfusion-in-ischaemic-stroke?lang=gb"}],"alsoUsedIn":[{"id":984,"kind":"Course","title":"2021 Virtual Conference Private Use - page 984","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/984"},{"id":984,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 984","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/984"},{"id":984,"kind":"Course","title":"2022 Virtual Conference Private Use - page 984","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/984"},{"id":970,"kind":"RestrictedPage","title":"Page 970 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/970"},{"id":955,"kind":"RestrictedPage","title":"Page 955 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/955"},{"id":1,"kind":"LiveSchedule","title":"1","link":"https://radiopaedia.org/admin/live_schedules/1"},{"id":18,"kind":"LiveSchedule","title":"18","link":"https://radiopaedia.org/admin/live_schedules/18"},{"id":987,"kind":"Course","title":"2021 Virtual Conference Private Use - page 987","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/987"},{"id":987,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 987","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/987"},{"id":987,"kind":"Course","title":"2022 Virtual Conference Private Use - page 987","link":"https://radiopaedia.org/courses/2022-virtual-conference-private-use/pages/987"},{"id":20,"kind":"LiveSchedule","title":"20","link":"https://radiopaedia.org/admin/live_schedules/20"},{"id":908,"kind":"Course","title":"Neuroradiology Lectures - page 908","link":"https://radiopaedia.org/courses/neuroradiology-lectures/pages/908"},{"id":908,"kind":"Course","title":"2021 Virtual Conference Private Use - page 908","link":"https://radiopaedia.org/courses/2021-virtual-conference-private-use/pages/908"},{"id":908,"kind":"Course","title":"Radiopaedia 2021 - isoCME - page 908","link":"https://radiopaedia.org/courses/radiopaedia-2021-isocme/pages/908"},{"id":908,"kind":"Course","title":"New test course - page 908","link":"https://radiopaedia.org/courses/new-test-course/pages/908"}],"stem":"\u003cp\u003eIn cerebral ischaemia, the ischaemic penumbra is best defined by which of the following combination of parameters?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/344"}],"attemptsPercentages":[{"alternativeId":"1694","percentage":83},{"alternativeId":"1696","percentage":6},{"alternativeId":"1697","percentage":3},{"alternativeId":"1695","percentage":9}],"promptToLogin":false,"questionManager":false,"articleId":"ischaemic-penumbra"}