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Med Neuro Lect11
Med Neuro Lect11 Subdural Hemorrhages
Question | Answer |
---|---|
Where does a subdural hematoma occur? | B/w the Inner Dural layer and the membranous arachnoid layer. |
Ruptures in what vessels will cause a subdural hematoma? | Cerebral veins which pass thru membranous arachnoid and inner dura to empty into sinuses. |
What can cause a subdural hematoma? | 1.Trauma. 2.Rapid Movements. **Inc risk with engorged veins. |
What herniations can a subdural hematoma cause? What are the effects of each? | 1.Cingulate herniation about falx cerebri (contusions causing behavioral changes). 2.Thalamic herniation about falx cerebri (midline shift). 3.Uncal herniation about tentorium cerebelli (compressing brainstem & CN III). **Same as EPIdural. |
Why doesn't the subdural hematoma present the same as epi with a lens-shape on a CT scan? What does it look like instead? | B/c it is b/w the dura-arachnoid space, the only 2 things confining it are: 1.Falx Cerebri at the midline, 2.Tentorium. **Will look HALF-MOON shaped on CT. |
What does a stright line in the fluid of a CT scanned subdural hematoma represent? | Fluid-Fluid interaction where the formed elements have settled to the bottom and only plasma remains at the top. |
Can a subdural hematoma appear to have a lens-shape? | YES, but it usually wont be located directly over the temporal bone like the epidural hematoma will. |
Difference b/w Acute and Chronic Subdural hematoma? | ACUTE (trauma): rapid bleeding, as dangerous as epidural. CHRONIC (elderly/alcholics): torn veins from a rapid head movement, takes hours to days to develop. |
Symptoms in a patient with a subdural hematoma | 1.Head Aches. 2.Cognitive impairment/ confussion. |