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• W1984070033 abstract "Background: Recent epidemiologic evidence has identified β-blockade as independently associated with improved survival in patients with isolated traumatic brain injury (TBI). Reduced sympathetic discharge and catecholamine release may improve circulation in the injured areas and influence delayed demise. The purpose of this study was to investigate the cerebral effect of β-blockade in a murine TBI model using immunohistochemical and microPET analysis. Methods: Balb/c mice underwent TBI as in a previously described model and were randomized to receive treatment with propranolol or placebo in a blinded fashion. Immunofluorescent images were obtained for vessel density (CD31), vessel perfusion (Ricinus communis agglutinin [RCA]-lectin), and cerebral hypoxia (hypoxyprobe-1) and compared by digital quantification. Perfusion measurements were acquired using positron emission tomography microPET scans with [64Cu]-pyruvaldehyde bis(N4-methylthiosemicarbazone) ([64Cu]-PTSM) and converted into standardized uptake values (SUV) for analysis. Results: On immunohistochemical analysis, the normal mouse cerebral perfusion was a quantitated mean of 325 ± 20, the cerebral perfusion after TBI and treatment with placebo was 113 ± 25, and the cerebral perfusion after TBI treated with propranolol was 172 ± 23. Immunohistochemical analysis demonstrated treatment with propranolol improved cerebral perfusion by 152% (p value <0.01) and reduced cerebral hypoxia by 24.2% (p value <0.01) compared with treatment with placebo. MicroPET imaging of the normal mouse brain after injection with placebo measured a SUV of 0.7075 ± 0.02; the normal mouse brain after treatment with propranolol measured a SUV of 0.400 ± 0.02. After TBI and treatment with placebo, the SUV reduced to 0.395 ± 0.01; after treatment with propranolol the SUV measured 0.515 ± 0.04. MicroPET imaging demonstrated propranolol improved cerebral perfusion after TBI to 130% of placebo (p value <0.01). Conclusion: Propranolol in vivo increased cerebral perfusion and decreased cerebral hypoxia. This research demonstrates β-blockade may prevent additional brain damage after traumatic insult and should be the focus of future clinical trials." @default.
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• W1984070033 date "2009-01-01" @default.
• W1984070033 modified "2023-10-07" @default.
• W1984070033 title "The In Vivo Effect of Propranolol on Cerebral Perfusion and Hypoxia After Traumatic Brain Injury" @default.
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• W1984070033 doi "https://doi.org/10.1097/ta.0b013e31819388be" @default.
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