start-ver=1.4 cd-journal=joma no-vol=58 cd-vols= no-issue=2 article-no= start-page=91 end-page=95 dt-received= dt-revised= dt-accepted= dt-pub-year=2004 dt-pub=200404 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=The close relationship between decreases in extracellular GABA concentrations and increases in the incidence of hyperbaric oxygen-induced electrical discharge. en-subtitle= kn-subtitle= en-abstract= kn-abstract=

To elucidate the mechanism by which hyperbaric oxygen (HBO2) induces electrical discharge, changes in the extracellular concentrations of GABA and glutamate were measured every 5 min using a microdialysis technique in rats during a period of exposure to HBO2 (5 atm abs). Electrical discharge was observed at 28 +/- 4 min after the onset of exposure. Though the extracellular concentrations of glutamate remained unchanged, the extracellular GABA concentrations (pre-exposure level, 0.026 +/- 0.005 microM in dialysate) began to decrease 15 min after the onset of exposure and reached their lowest level (74 +/- 14%, 0.019 +/- 0.004 microM) at the time of appearance of the discharge. There was a close logistic relationship between extracellular GABA concentrations and the discharge incidence, and the extracellular concentrations of GABA causing electrical discharge in 50% of the animals were estimated to be 80% of the pre-exposure level. These results suggest a possible mechanism that HBO2 exposure-induced discharge is caused by the decrease in extracellular concentration of GABA.

en-copyright= kn-copyright= en-aut-name=ZhangShan en-aut-sei=Zhang en-aut-mei=Shan kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TakedaYoshimasa en-aut-sei=Takeda en-aut-mei=Yoshimasa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=HagiokaShingo en-aut-sei=Hagioka en-aut-mei=Shingo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=GotoKeiji en-aut-sei=Goto en-aut-mei=Keiji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=MoritaKiyoshi en-aut-sei=Morita en-aut-mei=Kiyoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University affil-num=5 en-affil= kn-affil=Okayama University en-keyword=glutamic acid kn-keyword=glutamic acid en-keyword=hyperbaric oxygenation kn-keyword=hyperbaric oxygenation en-keyword=gamma-aminobutyricacid kn-keyword=gamma-aminobutyricacid en-keyword=microdialysis kn-keyword=microdialysis en-keyword=seizures kn-keyword=seizures END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=1987 dt-pub=19870331 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=高頻度ジェット換気法における換気式 従来の人工呼吸法との類似性 en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=五藤恵次 kn-aut-sei=五藤 kn-aut-mei=恵次 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 END