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Med Neuro Lect12

Med Neuro Lect12 Subarachnoid Hemorrhage

QuestionAnswer
Where do subarachnoid hematomas occur? B/w the membranous Arachnoid and the pia mater.
Where is a common spot of BL hemorrhaging into the subarachnoid space to pool? Subarachnoid cisterns (Cisterna Magna, Pentangular Cistern)
What subarachnoid cistern covers the circle of Willis? Pentangular Cistern
What is a subarachnoid hematoma a result of? Rupturing of an aneurysm.
3 most common locations of aneurysms causing subarachnoid hematomas? 1.Anterior Communicating (30%). 2.Posterior Communicating (25%, can compress CN III). 3.Middle Cerebral A (20%).
What increases your risk of an aneurysm? 1.Collagen disorders (marfans). 2.Smoking. 3.HTN.
What percent of people die within 30 days of a ruptured aneurysm? of those that survive, what percent ruptures again? 45%, 15%
Aneurysms result in a weakness in which layer of the artery? TUNICA MEDIA
Where do Intraparenchymal Hemorrhages occur? W/in the cerebrum of brainstem. Stay confined within that area.
Are intraparenchymal hemorrhages caused by aneurysms? NO, bursting of BV. **often seen in middle cerebral A.
Are Intraparenchymal hemorrhages dangerous? YES, they Inc intracranial pressure and erode tissue. **will start out with headache, then have generalized symptoms, then lose conciousness.
What 3 things will a intraparenchymal hemorrhage in the brainstem cause? 1.Compression of 4th ventricle. 2.Sulcul compression. 3.Compression of the pons against clivus.
What is a primary cause of an intraparenchymal hemorrhage in the brainstem? What is this called? Due to Inc intracranial pressure, the brainstem will be pushed down through foramen magnum, this will tear BV in the brainstem. **called a DURET hemorrhage.
Created by: WeeG
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