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- W2079886579 abstract "The importance of nitric oxide (NO) for CBF variations associated with arterial carbon dioxide changes was investigated in halothane-anesthetized rats by using an inhibitor of nitric oxide synthase, NG-nitro-L-arginine (NOLAG). CBF was measured by intracarotid injection of 133Xe. In normocapnia, intracarotid infusion of 1.5, or 7.5, or 30 mg/kg NOLAG induced a dose-dependent increase of arterial blood pressure and a decrease of normocapnic CBF from 85 +/- 10 to 78 +/- 6, 64 +/- 5, and 52 +/- 5 ml 100 g-1 min-1, respectively. This effect lasted for at least 2 h. Raising PaCO2 from a control level of 40 to 68 mm Hg increased CBF to 230 +/- 27 ml 100 g-1 min-1, corresponding to a percentage CBF response (CO2 reactivity) of 3.7 +/- 0.6%/mm Hg PaCO2 in saline-treated rats. NOLAG attenuated this reactivity by 32, 49, and 51% at the three-dose levels. Hypercapnia combined with angiotensin to raise blood pressure to the same level as the highest dose of NOLAG did not affect the CBF response to hypercapnia. L-Arginine significantly prevented the effect of NOLAG on normocapnic CBF as well as blood pressure and also abolished its inhibitory effect on hypercapnic CBF. D-Arginine had no such effect. Decreasing PaCO2 to 20 mm Hg reduced control CBF to 46 +/- 3 ml 100 g-1 min-1 with no further reduction after NOLAG. Furthermore, NOLAG did not change the percentage CBF response to an extracellular acidosis induced by acetazolamide (50 mg/kg).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2079886579 date "1992-11-01" @default.
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- W2079886579 title "Effect of Nitric Oxide Blockade by <i>N</i><sup>G</sup>-Nitro-l-Arginine on Cerebral Blood Flow Response to Changes in Carbon Dioxide Tension" @default.
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- W2079886579 doi "https://doi.org/10.1038/jcbfm.1992.131" @default.
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