Medicine an Surgery notes

Apr 24th, 2015
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SUBDURAL HAEMATOMAIntroductionSubdural hematoma (SDH) is classified by the amount of time that has elapsed from the inciting event, if known, to the diagnosis. When the inciting event is unknown, the appearance of the hematoma on CT scan or MRI can help date the hematoma. Acute SDHs are less than 72 hours old and are hyperdense compared to the brain on CT scan. Subacute SDHs are 3-20 days old and are isodense or hypodense compared to the brain. Chronic SDHs are older than 20 days and are hypodense compared to the brain. Clinically, SDHs behave as acute hematomas when less than 1 week old and as chronic hematomas when they are older than 1 week. AetiologyAcute SDHAn acute SDH commonly is associated with extensive primary brain injury. This diffuse parenchymal injury correlates strongly with the outcome of the patient Acute SDHs occur in 5-25% of patients with severe head injuries

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