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• W2073077700 abstract "Very little is known about the regulation of cerebral blood flow (CBF) in lower vertebrates, especially fish. In mammals, hypercapnia causes cerebral vasodilation and increased CBF through mechanisms that involve the production of nitric oxide (NO). We have used epi-illumination microscopy in vivo to observe effects of hypercapnia on venular erythrocyte velocity, used as an index of CBF velocity, in rainbow trout (Oncorhynchus mykiss) and crucian carp (Carassius carassius). Rainbow trout exposed to a pCO(2) of 7.5 mmHg displayed a small increase of CBF velocity in two out of five fishes, while dorsal aortic blood pressure (P(DA)) did not change. Exposing trout to a pCO(2) of 22.5 mmHg, resulted in an 80% increase in CBF velocity and a 21% increase in P(DA). Trout exposed to a pCO(2) of 75 mmHg showed an additional increase in blood pressure, while no further increase was seen in CBF velocity compared to a pCO(2) of 22. 5 mmHg. By contrast, no change in CBF velocity was seen in crucian carp, even at a pCO(2) of 75 mmHg. None of the circulatory changes seen in the trout could be blocked by superfusing the brain surface with the NO synthase blocker N(G)-nitro-L-arginine. The results point at striking species differences in the responses of CBF and P(DA) to hypercapnia in fish, and that the hypercapnia induced increase in CBF velocity seen in rainbow trout is independent of NO production." @default.
• W2073077700 created "2016-06-24" @default.
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• W2073077700 date "2000-02-01" @default.
• W2073077700 modified "2023-10-02" @default.
• W2073077700 title "Brain blood flow during hypercapnia in fish: no role of nitric oxide" @default.
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• W2073077700 doi "https://doi.org/10.1016/s0006-8993(99)02428-2" @default.
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