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Brain, Vol. 124, No. 1, 2-4,
January 2001
© 2001 Oxford University Press
Editorial |
Mapping the ischaemic penumbra with PET: a new approach
Professor of Stroke Medicine, University of Cambridge Neurology Unit, Addenbrooke's Hospital, Cambridge, UK
After decades of nihilism, recent evidence indicates that neurological outcome after acute stroke can be improved through three types of measures (Brott and Bogousslavsky, 2000
): (i) restoring perfusion in the ischaemic tissue with the thrombolytic agent recombinant tissue plasminogen activator (rt-PA) given intravenously within 3 h of clinical onset; (ii) preventing secondary deleterious events such as hyperglycaemia, pyrexia, hypoxia, systemic hypotension, stroke recurrence and pulmonary embolism, best achieved in specialized stroke units; and (iii) providing appropriate rehabilitation. The reperfusion strategy is based on experimental evidence in the nonhuman primate with middle cerebral artery (MCA) occlusion that, surrounding the profoundly ischaemic core of already irreversible damage, there exists an area of brain tissue (the `penumbra') which, though severely ischaemic and functionally silent, can still escape infarction if perfusion is restored before a certain time has elapsed (Lassen, 1990
); the penumbra has been documented in man
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