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  • Title: Neuropathology of the vegetative state after head injury.
    Author: Graham DI, Adams JH, Murray LS, Jennett B.
    Journal: Neuropsychol Rehabil; 2005; 15(3-4):198-213. PubMed ID: 16350963.
    Abstract:
    A detailed neuropathological study of patients identified clinically after head injury as either severely disabled (SD, n = 30) or vegetative (VS, n = 35) has been carried out to determine the nature and frequency of the various pathologies that form the basis of these clinical states. Patients who were SD were older (SD median 49.5 yrs vs. VS median 38 yrs, p = .04), more likely to have a lucid interval (SD 31% vs. VS 9%, p = .03), and to have had an acute intracranial haematoma (SD 70% vs. VS 26%, p < .001). SD patients less often had severe, Grades (2 or 3) of traumatic diffuse axonal injury (SD 30% vs. VS 71%, p = .001) and less often had thalamic damage (SD 37% vs. VS 80%, p < .001). Similar features of both focal and diffuse damage were present in some SD and VS cases with both groups having considerable damage to white matter and to the thalamus. It is concluded that the principal structural basis of both SD and VS is diffuse traumatic axonal injury (DAI) with widespread damage to white matter and changes in the thalami. However, both ischaemic brain damage and the vascular complications of raised intracranial pressure contributed to the clinical signs and symptoms.
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