Abstract
This study investigated the relationships between blood pressure, cortical oxygen pressure and hydroxyl radicals in the brain of adult cats during hemorrhagic hypotension and retransfusion. Oxygen pressure in the blood of the cortex was measured optically by the oxygen dependent quenching of phosphorescence and hydroxyl radicals by in vivo microdialysis. Following a 2 h stabilization period after implantation of the microdialysis probe in the striatum, the mean arterial blood pressure (MAP) was decreased in a stepwise manner from 132±2 Torr (control) to 90±1 Torr, 70±3 Torr and 50±3 Torr, holding the pressure at each level for 15 min. The whole blood was then retransfused and measurements were continued for 90 min. Cortical oxygen pressure progressively decreased with decrease in MAP, decreasing from 50±2 Torr (control) to 42±1 Torr, 31 ±2 Torr and 22±2 Torr, respectively. The level of hydroxyl radical increased by 20–25% following first 15 min of bleeding and stay on this level during the remaining period of hypotension. Maximal increase (by 78%) in level of hydroxyl radicals was observed after 15 min of retransfusion. The present study demonstrated that during hypotension and retransfusion there was an increase in the level of hydroxyl radicals in striatum. These can be important mediators of postischemic injury to the striatum.
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Song, D., Murphy, S., Olano, M., Wilson, D.F., Pastuszko, A. (1998). Effect of Hemorrhagic Hypotension on Hydroxyl Radicals in Cat Brain. In: Hudetz, A.G., Bruley, D.F. (eds) Oxygen Transport to Tissue XX. Advances in Experimental Medicine and Biology, vol 454. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-4863-8_21
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DOI: https://doi.org/10.1007/978-1-4615-4863-8_21
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