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Brain disturbances due to rapid decompression-induced air bubbles, and effects of hyperbaric oxygenation

Research Project

Project/Area Number 06671542
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Anesthesiology/Resuscitation studies
Research InstitutionUniversity of the Ryukyus

Principal Investigator

YUSA Toshiko  Univ.of the Ryukyus, Fac.of Med.Associate Professor, 医学部, 助教授 (30032329)

Co-Investigator(Kenkyū-buntansha) HIRATA Yukio  Univ.of the Ryukyus, Fac.of Med.Professor, 医学部, 教授 (70073070)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥1,500,000 (Direct Cost: ¥1,500,000)
KeywordsRapid decompression / Decompression sickness / Air bubble / Blood-brain barrier / Cerebral microcirculation / Cerebral ischemia-reperfusion / Maturation Phenomenon / Brain glutamate / 脳虚血 / maturation phenomenon / 遅発性神経細胞壊死 / ラット脳
Research Abstract

1.Effect of rapid decompression
To examine the changes in blood-brain barrier (BBB), cerebral microcirculation and histology from 0.25 to 72 hrs after decompression, rats were exposed to experimental compression to 6 atm abs air for 90 min and subsequent rapid decompression. The wide area stained with Evans blue and the regions of defective filling with Indian ink observed immediately after decompression decreased in size with time and were undetectable during 3 to 24 hrs after decompression. The edematous brain tissue with enlarged perivascular space and darkly stained nerve cells observed immediately after decompression also decreased after one to 24 hrs from decompression. These reversible dysbaric changes, however, were reappeared at 48 to 72 hrs after decompression. These early reversible derangements were interpreted to be the physico-chemical effects of intravascularly formed microbubbles. On the other hand, the reappearance of BBB and microcirculatory disturbances at 72 hrs afte … More r decompression suggested the maturation phenomenon after temporal brain ischemia induced by dysbaric microbubbles.
2.Effect of hyperbaric oxygenation (HBO) immediately after rapid decompression
The area stained with Evans blue was not seen after HBO,but the regions of defective filling with Indian ink and histological changes were still observed. Thus microcirculatory disturbances after rapid decompression remain even after HBO.
3.Effect of ischemia-reperfusion and nitric oxide synthase (NOS) inhibition on CBF and glutamate release
The effects was studied in the rat forebrain ischemia-reperfusion model.
In low flow cerebral ischemic model, after NOS inhibition, the vasoconstrictive effects occurred despite an increase in cerebral perfusion pressure by increased systemic MAP,and glutamate levels were lower than control Group. In complete cerebral ischemic model, however, cortical CBF decreased to about half of the initial control level, without an increase in cerebral perfusion pressure. In addition, glutamate levels was higher than control Group. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] 湯佐祚子: "高気圧酸素療法の臨床" 新医療. 237. 126-128 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 湯佐祚子: "減圧症(潜水病)について" 沖縄県医師会報. 317. 39-45 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 湯佐祚子: "脳虚血再灌流後の脳血液量に及ぼすL-NAMEの影響" Journal of Anesthesia. 9. 350- (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 野原敦: "急速減圧ラット脳における経時的変化、第二報" 日本高気圧環境医学会雑誌. 30. 25- (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Toshiko YUSA: "Effects of nitric oxide synthase (NOS) inhibition on CBF and glutamate release after cerebral ischemia-reperfusion" The 2nd Annual Meeting of Oxygen Society,Abstract. 132- (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 湯佐祚子: "前脳虚血-再灌流の脳血流及びglutamate遊離に及ぼす影響とnitric oxideの関与について" Journal of Anesthesia. 10. 521- (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Atsushi NOHARA: "Reversibility in blood-brain barrier,microcirculation and histology of dysbaric brain" Undersea & Hyperbaric Medicine 投稿中.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] YUSA T: "Clinical application of hyperbaric oxygen therapy." This is Medicine in Japan. 273. 126-128 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] YUSA T: "Decompression Sickness (Divers' disease)" Okinawaken Ishikai Kaihou. 317. 39-45 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] YUSA T: "Effects of nitric oxide synthase inhibition on cerebral blood flow following cerebral ischemia and recirculation." Journal of Anesthesia. 9. 350 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] NOHARA A: "The course of brain damages after rapid decompression in rat." The Japanese Journal of Hyperbaric Medicine. 30. 25 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] YUSA T: "Effects of nitric oxide synthase (NOS) inhibition on CBF and glutamate release after cerebral ischemia-reperfusion." The 2nd Annual Meeting of Oxygen Society : Abstract. 132.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] YUSA T: "Effects of forebrain ischemia reperfusion and nitric oxide on cerebral blood flow and glutamate release." Journal of Anesthesia. 10. 521 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] NOHARA A: "Reversibility in blood-brain barrier, microcirculation and histology of dysbaric brain" Undersea & Hyperbaric Medicine. (submitted).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 湯佐祚子: "減圧症(潜水病)について" 沖縄県医師会報. 317. 39-45 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 湯佐祚子: "脳虚血再灌流後の脳血液量に及ぼすL-NAMEの影響" Journal of Anesthesia. 9. 350- (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 野原 敦: "急速減圧ラット脳における経時的変化、第二報" 日本高気圧環境医学会雑誌. 30. 25- (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Toshiko YUSA: "Effects of nitric oxide synthase(NOS) inhibition on CBF and glutamate release after cerebral ischemia-reperfusion" The 2nd Annual Meeting of Oxygen Society,Abstract. 132- (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 湯佐祚子: "前脳虚血-再灌流の脳血流及びglutamate遊離に及ぼす影響とnitric oxideの関与について" Journal of Anesthesia. 10. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 湯佐祚子: "減圧性気泡による血液脳関門、微小循環及び組織学的変化" 麻酔. 42. S597 (1993)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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