Med Neuro Lect12 Subarachnoid Hemorrhage
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| Where do subarachnoid hematomas occur? | B/w the membranous Arachnoid and the pia mater.
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| Where is a common spot of BL hemorrhaging into the subarachnoid space to pool? | Subarachnoid cisterns (Cisterna Magna, Pentangular Cistern)
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| What subarachnoid cistern covers the circle of Willis? | Pentangular Cistern
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| What is a subarachnoid hematoma a result of? | Rupturing of an aneurysm.
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| 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%).
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| What increases your risk of an aneurysm? | 1.Collagen disorders (marfans).
2.Smoking.
3.HTN.
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| What percent of people die within 30 days of a ruptured aneurysm? of those that survive, what percent ruptures again? | 45%,
15%
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| Aneurysms result in a weakness in which layer of the artery? | TUNICA MEDIA
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| Where do Intraparenchymal Hemorrhages occur? | W/in the cerebrum of brainstem.
Stay confined within that area.
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| Are intraparenchymal hemorrhages caused by aneurysms? | NO, bursting of BV.
**often seen in middle cerebral A.
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| Are Intraparenchymal hemorrhages dangerous? | YES, they Inc intracranial pressure and erode tissue.
**will start out with headache, then have generalized symptoms, then lose conciousness.
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| 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.
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| 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.
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