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- W2049013531 abstract "The purpose of this study was to determine the relationship between the increase in local cerebral blood flow during neuronal activation (evoked LCBF) and the baseline flow level. We measured the hemodynamics in α-chloralose-anesthetized rats using laser-Doppler flowmetry during somatosensory stimulation under the hypocapnic, normocapnic and hypercapnic conditions. The baseline levels of LCBF and red blood cell (RBC) velocity under hypocapnia (PaCO2=26.4±1.1 mmHg) were, respectively, 10 and 11% lower than those under normocapnia (PaCO2=34.2±1.4 mmHg) (P<0.01). The evoked response magnitude of LCBF and RBC velocity under hypocapnia were, respectively, 22 and 18% lower than those under normocapnia. There was no significant difference in the baseline level and evoked response magnitude of RBC concentration. On the other hand, the baseline levels of LCBF, RBC velocity and RBC concentration under hypercapnia (PaCO2=73.4±13.3 mmHg) were, respectively, 47, 24 and 14% higher than those under normocapnia (PaCO2=34.7±2.5 mmHg) (P<0.01). The evoked response magnitude of LCBF, RBC velocity and RBC concentration under hypercapnia were, respectively, 96, 82 and 62% greater than those under normocapnia. After normalization with respect to each baseline level, there was no significant difference in normalized evoked response magnitude of LCBF, RBC velocity and RBC concentration, either between hypocapnic and normocapnic conditions or between hypercapnic and normocapnic conditions, indicating that evoked LCBF is proportional to the baseline flow. These results suggest that the amount of evoked LCBF is not determined by the demand for metabolic substrates." @default.
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- W2049013531 date "2000-12-01" @default.
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- W2049013531 title "Evoked local cerebral blood flow induced by somatosensory stimulation is proportional to the baseline flow" @default.
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- W2049013531 doi "https://doi.org/10.1016/s0168-0102(00)00175-9" @default.
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