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Effects of cerebral hypothermia on brain tissue impedance and extracellular ion concentrations

Research Project

Project/Area Number 10671320
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Cerebral neurosurgery
Research InstitutionJuntendo University

Principal Investigator

MORI Kentaro  Juntendo University, Dep of Neurosurgery, Assistant Profesor, 医学部, 助教授 (30200364)

Co-Investigator(Kenkyū-buntansha) KUSUMOTO Masayuki  Juntendo University, Dep of Neurosurgery, Assistant, 医学部, 助手 (20195449)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Keywordshypothermia / cerebral ischemia / glutamate / vasoconstriction / brain impedance / extracellular ion / water channel / ion channel
Research Abstract

The purpose of this research project was to investigate the protective mechanismas of cerebral hypothermia and to improve its therapeutic effects.
1. Effects of cerebral hypothermia on cerebral blood flow and metabolism
We investigated the effects of hypothermia on cerebral blood flow (CBF) and metabolism (CMROィイD22ィエD2, AVDOィイD22ィエD2), cerebral venous oxygen saturation (ScvOィイD22ィエD2), cerebral blood volume (CBV), and cerebral vascular resistance (CVR) using 34 anesthetized cat. Brain temperature was controlled from 37 to 25℃. AVDOィイD22ィエD2 increased significantly at 29℃, ScvOィイD22ィエD2 decreased significantly at 29℃, CBV decreased significantly at 29℃, and CVR increased significantly at 29℃. The combined effect of hypothermia with vasopressor (noradrenalin) administration improved all these metabolic parameters. These results suggest that hypothermia below 30℃ may cause cerebral vasoconstriction and misery perfusion in the brain. This potential risk of relative ischemia can be avoided b … More y combination with vasopressor administration.
2. Effects of cerebral hypothermia on brain tissue impedane and extracellular ion concentrations
We investigated the effects of mild cerebral hypothermia on brain tissue impedance (brain extracellular space: ECS) and extracellular ion concentrations ([NaィイD1+ィエD1] ィイD2eィエD2, [KィイD1+ィエD1] ィイD2eィエD2) under cerebral ischemia using anesthetized 11 rats. After global ischemia, ECS began to decrease (post-ischemic cell swelling) at 32±5 sec and then [NaィイD1+ィエD1] ィイD2eィエD2 started to decrease (NaィイD1+ィエD1 ion influx into cells) at 83±30 sec. Hypothermia significantly prolonged both changes of ECS and extracellular ion concentrations. These result shows that cerebral ischemic cell swelling start to occur earlier than extracellular NaィイD1+ィエD1 ion influx into cells. This fact makes it difficult to explain the mechanism of the cell swelling by the former theory that swelling is caused by isotonic water movement after NaィイD1+ィエD1 influx. It is suggested that a depletion of intracellular ATP causes dephospholization of water channel (aquaporin 4) and directly open this water channel. Cerebral hypothermia may influence this water channel directly and prolong the opening of this water channel. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Kentaro Mori: "Misery perfusion Caused by Cerebral Hypothermia improved by Vasopressor Administration"Neurological Research. 21. 585-592 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kentaro Mori: "Effects of mild(33℃) and moderate(29℃)hypothemia on cerebral blood flow and metabolism, lactate, and extracellular glutamate in experimental head injury"Neurological Research. 20. 719-726 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kentaro Mori: "Effects of mild and moderate hypothermia on cerebral metabolism and glutamate in an experimental head injury"Acta Neurochirugica. 71. 222-224 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] kentaro Mori: "Quantitative kinetic analysis of blood vessels in the outer membranes of chronic subdural hematomas"Neurol. Med Chir(Tokyo). 38. 697-703 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kentaro Mori: "Mechanism of ^<20>Thallium-chloride uptake in tumor cells and its relationship to potassium channels"Neurological Research. 20. 19-22 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Mori K, Maeda M, Miyazaki M, Iwase H: "Misery perfusion caused by cerebral hypothermia improved by vasopressor administration"Neurol Res. 21. 585-592 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Mori K, Maeda M, Miyazaki M, Iwase H: "Effects of mild (33℃) and moderate (29℃) hypothermia on cerebral blood flow and metabolizm, and extracellular glutamate in experimental head injury"Neurol Res. 20. 719-726 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Mori K, Maeda M, Miyazaki M, Iwase H: "Effects of mild and moderate hypothermia on cerebral metabolism and glutamate in an experimental head injury"Acta Neurochirurgica. 71. 222-224 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Mori K, Adachi K, Cho K, Ishimaru S, Maeda M: "Quantitative Kinetic analysis of blood vessels in the outer membranes of chronic subdural hematomas"Neurol Med Chir (Tokyo). 38. 697-703 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Mori K, Yamaguchi T, Maeda M: "Mechanism of ィイD1201ィエD1Thallium-chloride uptake in tumor cells and its relationship to potassium channels"Neurol Res. 20. 19-22 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kentaro Mori: "Misery perfusion Caused by Cerebral Hypothermia lmproved by Vasopressor Administration"Neurological Research. 21. 585-592 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kentaro Mori: "Effects of mild(33℃) and moderate (29℃) hypothermia on cerebral blood flow and metabolism lactate and extracellular qlutamate in experimental head injury"Neurological Research. 20. 719-726 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kentaro Mori: "Effects of mild and moderate hypothermia on cerebral metabolism and glutamate in an experimental head injury"Acta Neurochirurgica. 71. 222-224 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kentaro Mori: "Quantitative Kinetic analysis of blood vessels in the outer membranes of chronic subdural hematomas"Neurol Med Chir (Tokyo). 38. 697-703 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kentaro Mori: "Mechanism of ^<201>Thallium-chloride uptake in tumor cells and its relationship to potassium channels"Neurological Research. 20. 19-22 (198)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kentaro Mori: "Effects of mild (33℃) and moderate (29℃) hypothermia on cerebral blood flow and metabolism, lactate,and extracellular glutamate in experimental head injury" Neurological Research. 20. 719-726 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kentaro Mori: "Effects of mild and moderate hypothermia on cerebral metabolism and glutamate in an experimental head injury" Acta Neurochirurgica. 71. 222-224 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Kentaro Mori: "Misery perfusion Caused by Cerebral Hypothermia Improved by Vasopressor Administration" Neurological Research. in press. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 森 健太郎: "実験的頭部外傷における脳低温療法が脳循環代謝および細胞外glutamate濃度に及ぼす効果について" Progress in Research on ICP. 29-34 (1997)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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