The human central nervous system discharges carbon dioxide and lactic acid into the cerebrospinal fluid
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Fluids and Barriers of the CNS Open Access
RESEARCH
The human central nervous system discharges carbon dioxide and lactic acid into the cerebrospinal fluid Tetsuya Akaishi1,2* , Eiko Onishi3, Michiaki Abe1,4, Hiroaki Toyama3, Kota Ishizawa1,4, Michio Kumagai3, Ryosuke Kubo3, Ichiro Nakashima5, Masashi Aoki2, Masanori Yamauchi3 and Tadashi Ishii1
Abstract Background: The central nervous system was previously thought to draw oxygen and nutrition from the arteries and discharge carbon dioxide and other metabolic wastes into the venous system. At present, the functional role of cerebrospinal fluid in brain metabolism is not fully known. Methods: In this prospective observational study, we performed gas analysis on venous blood and cerebrospinal fluid simultaneously acquired from 16 consecutive preoperative patients without any known neurological disorders. Results: The carbon dioxide partial pressure (pCO2) (p
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