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• W4232199481 abstract "Phenylephrine-induced hypertension (increase of 30-35 mm Hg for 15 min) is reported to increase cerebral perfusion pressure and collateral flow to ischemic areas of the brain in a rat model of focal cerebral ischemia. In the present study, we examined whether phenylephrine-induced hypertension of similar magnitude and duration was beneficial in a rat model of closed head trauma (CHT). Forty-eight rats were randomized into four experimental conditions: CHT at time 0 min (yes/no), plus phenylephrine-induced hypertension (increase of 30-35 mm Hg for 15 min) at 65 min (yes/no). CHT was delivered using a weight-drop device (0.5 J). Outcome measures were neurological severity score (NSS) at 1, 4, and 24 h, and brain tissue specific gravity (microgravimetry) and injury volume (2,3,5-triphenyltetrazoium chloride) at 24 h. After CHT, NSS at 24 h (median +/- range) and brain tissue specific gravity (mean +/- SD, injured hemisphere) were 7 +/- 2 and 1.033 +/- 0.007 without phenylephrine and 8 +/- 2 and 1.035 +/- 0.005 with phenylephrine (P = 0.43), respectively. Tissue injury volume (mean +/- SD) was 335 +/- 92 mm3 without phenylephrine and 357 +/- 154 mm3 with phenylephrine (P > 0.62). The results of our study indicate that postinjury treatment with 15 min of phenylephrine-induced hypertension does not attenuate brain edema, reduce tissue injury volume, or improve neurological outcome after CHT in rats. Implications: Phenylephrine-induced hypertension is reported to increase cerebral perfusion pressure and blood flow in a rat model of focal cerebral ischemia. In our study, phenylephrine-induced hypertension did not decrease brain edema or tissue injury volume or improve neurological outcome in a rat model of closed head trauma. (Anesth Analg 1998;87:574-8)" @default.
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• W4232199481 date "1998-09-01" @default.
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• W4232199481 title "Phenylephrine-Induced Hypertension Does Not Improve Outcome After Closed Head Trauma in Rats" @default.
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• W4232199481 doi "https://doi.org/10.1213/00000539-199809000-00014" @default.
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