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- W2023130791 abstract "Unanesthetized adult female ponies were studied near sea level (250 m) and during sojourns to 3400 m (N=6) and 4300 m (N=7) altitude. The pH, PCO2, and PO2 of arterial blood and pH and PCO2 of cerebrospinal fluid (CSF) were measured under conditions of acute (1 hr) and chronic (1-45 days) hypoxia. Cerebrospinal fluid was sampled from the cisterna magna of the awake pony and arterial blood withdrawn from an indwelling arterial catheter. In both groups of animals, PaCO2 decreased slightly after 1 hr of hypoxia (delta PaCO2= - 0.6 mm Hg at 3400 m; - 3.9 mm Hg at 4300 m), decreased further after 1-5 days at high altitude (delta PaCO2= - 7.2 mm Hg at 3400 m; - 12.3 mm Hg at 4300 m) and then increased significantly after 6 days of chronic hypoxia (delta PaCO2= + 4.1 mm Hg at 3400 m; + 4.7 mm Hg at 4300 m). Although PaO2 decreased markedly during acute hypoxia, subsequent changes in PaCO2 at high altitude did not alter PaO2 from that observed during acute hypoxia (PaO2=52 mm Hg at 3400 m; 41 mm Hg at 4300 m). The pH of CSF increased during acute hypoxia (delta pH= + 0.013 unit at 3400 m; + 0.033 unit at 4300 m) and became more alkaline after 1-2 days at high altitude (delta pH= + 0.031 unit at 3400 m; + 0.064 unit at 4300 m). At 4300 m, CSF pH remained alkaline to control values throughout sojourn. Under these conditions of chronic hypocapnic hypoxia, CSF pH was imperfectly regulated and regulated in a magnitude equal to (3400 m) or less than (4300 m) arterial blood. Furthermore, the similarity of relative changes in CSF [HCO3-] and arterial [HCO3-] during chronic hypoxia may indicate a passive regulation of CSF [HCO3-] rather than local 'CSF-specific' mechanisms as previously proposed." @default.
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- W2023130791 date "1975-10-01" @default.
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- W2023130791 title "Cerebrospinal fluid alkalosis during high-altitude sojourn in unanesthetized ponies" @default.
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- W2023130791 doi "https://doi.org/10.1016/0034-5687(75)90048-1" @default.
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