Cerebral Ischemia occurs when cerebral blood flow is less than
Correct Answer: 20 ml/100g/minute
Description: *Acute occlusion of an intracranial vessel causes a reduction in blood flow to the brain region it supplies*Cerebral blood flow to zero causes death of brain tissue within 4-10 minutes*<16-18 mL/100 g tissue per minute cause infarction within an hour; * <20 mL/100 g tissue per minute cause ischemia without infarction unless prolonged for several hours or days.*If blood flow is restored prior to a significant amount of cell death, the patient may experience only TIA.*Tissue surrounding the core region of infarction is ischemic but reversibly dysfunctional and is referred to as the ischemic penumbra. *The ischemic penumbra will eventually infarct if no change in flow occurs.(Ref: Harrison's 18/e p3271 )
Category:
Medicine
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now