Question 1767
{"accessible":true,"alternatives":[{"id":8777,"text":"A"},{"id":8778,"text":"B"},{"id":8779,"text":"C"},{"id":8780,"text":"D"},{"id":8781,"text":"E"}],"archived":false,"correctAlternativeId":8779,"explanation":"\u003cp\u003eBenign oligemia occurs when the brain's ability to autoregulate cerebral blood flow (CBF) by vasodilation is exceeded and cerebral blood flow begins to reduce despite maximal vasodilatation. If this reduction is left unchecked, eventually neurological dysfunction and eventual infarction will occur.\u0026nbsp;\u003c/p\u003e\u003cp\u003eThere is, however, a window wherein brain tissue continues to function normally and can remain mildly hypoperfused indefinitely without progressing to infarction; this is termed benign oligemia.\u0026nbsp;\u003c/p\u003e","id":1767,"imageUrl":"https://prod-images-static.radiopaedia.org/multiple_choice_questions/260/Slides-for-perfusion-case.key_big_gallery.jpeg","imageAttribution":{"kind":"external","attribution":"Aaron S. Field MD, PhD"},"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/1767","nextQuestionPath":"/articles/benign-oligemia/questions/1765","relatedArticles":[{"id":82022,"title":"CT brain perfusion (protocol)","link":"/articles/ct-brain-perfusion-protocol?lang=us"}],"alsoUsedIn":[],"stem":"\u003cp\u003eIn the accompanying\u0026nbsp;graphic, that depicts\u0026nbsp;the changes in cerebral perfusion parameters with progressively decreasing perfusion pressure, which letter best identifies benign oligemia?\u0026nbsp;\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/1767"}],"attemptsPercentages":[{"alternativeId":"8781","percentage":5},{"alternativeId":"8780","percentage":5},{"alternativeId":"8777","percentage":3},{"alternativeId":"8778","percentage":11},{"alternativeId":"8779","percentage":77}],"promptToLogin":false,"questionManager":false,"articleId":"benign-oligemia"}