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What are the AIS and ISS?
Abbreviated Injury Score and Injury Severity Score.
Lucid interval followed by acute deterioration in consciousness after a blow to the head is classically associated with...
What % of epidural hematomas have an associated skull fracture?
Epidural Hematoma signs associated with worse outcome
- EDH >2cm
- Ongoing hemorrhage suggested by mixed densitities.
- >1.5cm of midline shift.
- Brainstem deformity.
- Extensive associated injury.
Low density area within an epidural hematoma suggests what?
Hyperacute hemorrhage within a clot
When is a subdural hematoma considered chronic? Peak incidence?
- Present for greater than 3 wks and
- Hypodense to brain parenchyma on CT.
T/F: 20% of patients with chronic subdural hematoma have either no h/o trauma or only minor injury.
False. 50% of patients with chronic subdural hematoma have either no h/o trauma or only minor injury.
When does Delayed Postraumatic Intracranial Hemorrhage occur? What are common clinical factors seen with delayed hemorrhage?
- Most occur within a few hours of the initial injury.
- >80% occur within 48 hours of injury.
ICP >30mmHg (nml <10mmHg)
- Clinical deterioration of the patient
- Failure of the patient to improve.
Etiologies of SAH? (4)
- Ruptured aneurysm
- Secondary to intraparenchymal hemorrhage
Location of SAH blood suggests location of aneurysm rupture.
Sylvian fissure -
Posterior fossa -
Cavum septum pellucidum-
- Sylvian fissure - Ipsilateral MCA aneurysm
- Posterior fossa - Posterior communicating artery aneurysm
- Cavum septum pellucidum or interhemispheric fissure - Anterior communicating artery aneurysm
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