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• W2024666979 abstract "Spreading depression (SD) is a slowly propagating wave of transient neuronal and glial depolarization that develops after stroke, trauma and subarachnoid hemorrhage. In compromised tissue, repetitive SD-like injury depolarizations reduce tissue viability by worsening the mismatch between blood flow and metabolism. Although the mechanism remains unknown, SDs show delayed electrophysiological recovery within the ischemic penumbra. Here, we tested the hypothesis that the recovery rate of SD can be varied by modulating tissue perfusion pressure and oxygenation. Systemic blood pressure and arterial pO 2 were simultaneously manipulated in anesthetized rats under full physiologic monitoring. We found that arterial hypotension doubled the SD duration, whereas hypertension reduced it by a third compared with normoxic normotensive rats. Hyperoxia failed to shorten the prolonged SD durations in hypotensive rats, despite restoring tissue pO 2 . Indeed, varying arterial pO 2 (40 to 400 mm Hg) alone did not significantly influence SD duration, whereas blood pressure (40 to 160 mm Hg) was inversely related to SD duration in compromised tissue. These data suggest that cerebral perfusion pressure is a critical determinant of SD duration independent of tissue oxygenation over a wide range of arterial pO 2 levels, and that hypotension may be detrimental in stroke and subarachnoid hemorrhage, where SD-like injury depolarizations have been observed." @default.
• W2024666979 created "2016-06-24" @default.
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• W2024666979 date "2010-01-20" @default.
• W2024666979 modified "2023-10-13" @default.
• W2024666979 title "Perfusion Pressure-Dependent Recovery of Cortical Spreading Depression is Independent of Tissue Oxygenation over a Wide Physiologic Range" @default.
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• W2024666979 doi "https://doi.org/10.1038/jcbfm.2009.285" @default.
• W2024666979 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2921789" @default.
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