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• W4241010482 abstract "Laser Doppler flowmetry was used to further investigate the role of nitric oxide (NO) in CO2-induced cerebrocortical hyperemia in rats. A second objective was to elucidate the source(s) of the NO involved in the response to hypercapnia. We used the L-arginine analogue Nomega-nitro-L-arginine methyl ester (L-NAME) to inhibit NO synthase (NOS) and 7-nitroindazole (7-NI) to selectively inhibit brain or nonendothelial NOS. Rats were anesthetized with a single dose of intraperitoneal (IP) pentobarbital (65 mg/kg) for surgery; 60-90 min later they were ventilated with 1.0% halothane in 30% O2 for 1 h to achieve a steady state. The animals were assigned to one of five groups. A control group (n = 9) was infused with 1 mL of saline. The second group (n = 10) received 20 mg/kg of L-NAME intravenously (IV). A third group (n = 9) also received L-NAME; in addition, cerebrocortical laser Doppler flow (LDF) and mean arterial pressure (MAP) were restored to baseline using the NO donor sodium nitroprusside (SNP). In a fourth group (n = 9), MAP was increased to the level usually seen after L-NAME with an infusion of phenylephrine (0.5-5 micro g [center dot] kg-1 [center dot] min-1). A fifth group (n = 11) received 7-NI at 40 mg/kg IP. The hypercapnic response of LDF was tested in all groups by adding 5% CO2 to the inspired gas at 30-45 min posttreatment; all changes in LDF were significant. In the control group, hypercapnia induced a 70% +/- 24% increase in LDF. In the L-NAME-treated group, the response was decreased to 36% +/- 22% at a posttreatment LDF that was 25% +/- 13% lower than the pre-L-NAME level. In the group where baseline LDF and MAP were restored with SNP, the CO2 response was 56% +/- 15% (not significant versus control). In the group in which MAP was increased with phenylephrine, the response to hypercapnia was 48% +/- 22% at a posttreatment LDF unchanged from pretreatment. These data suggest that increased vascular tone or the absence of basal NO after NOS inhibition influenced the vasodilator response to hypercapnia. In the 7-NI-treated group the response to hypercapnia was 38% +/- 3%, significantly attenuated at a posttreatment flow only 14% +/- 7% lower than pre-7-NI. We conclude that 1) endothelial NO does not mediate the response to hypercapnia but may have a permissive role in the response and 2) that brain NO may have an important role in the response to hypercapnia. (Anesth Analg 1997;84:363-9)" @default.
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• W4241010482 date "1997-02-01" @default.
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• W4241010482 title "The Role of Nitric Oxide in the Cerebrovascular Response to Hypercapnia" @default.
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• W4241010482 doi "https://doi.org/10.1213/00000539-199702000-00023" @default.
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