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• W2066122082 abstract "We sought to characterize the spatial and temporal evolution of human cerebral infarction. Using a novel method of quantitatively mapping the distribution of hypoxic viable tissue identified by 18F-fluoromisonidazole (18F-FMISO) PET relative to the final infarct, we determined its evolution and spatial topography in human stroke.Patients with acute middle cerebral artery territory stroke were imaged with 18F-FMISO PET (n=19; <6 hours, 4; 6 to 16 hours, 4; 16 to 24 hours, 5; 24 to 48 hours, 6). The hypoxic volume (HV) comprised voxels with significant (P<0.05; >1 mL) uptake on statistical parametric mapping compared with 15 age-matched controls. Central, peripheral, and external zones of the corresponding infarct on the anatomically coregistered delayed CT were defined according to voxel distance from the infarct center and subdivided into 24 regions by coronal, sagittal, and axial planes. Maps (penumbragrams) displaying the percentage of HV in each region were generated for each time epoch.Higher HV was observed in the central region of the infarct in patients studied within 6 hours of onset (analysis of covariance [ANCOVA]; P<0.05) compared with those studied later, in whom the HV was mainly in the periphery or external to the infarct. HV was maximal in the superior, mesial, and posterior regions of the infarct (ANCOVA; P<0.05).These observations suggest that infarct expansion occurs at the expense of hypoxic tissue from the center to the periphery of the ischemic region in humans, similar to that seen in experimental animal models. These findings have important pathophysiological and therapeutic implications." @default.
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• W2066122082 date "2003-11-01" @default.
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• W2066122082 title "Topography and Temporal Evolution of Hypoxic Viable Tissue Identified by ¹⁸ F-Fluoromisonidazole Positron Emission Tomography in Humans After Ischemic Stroke" @default.
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• W2066122082 doi "https://doi.org/10.1161/01.str.0000094422.74023.ff" @default.
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