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Regional changes in cerebral blood flow and metabolism during hypothermia

Research Project

Project/Area Number 08671560
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Cerebral neurosurgery
Research InstitutionAsahikawa Medical College

Principal Investigator

SAKO Kazuhiro  Asahikawa Medical College, Neurosurgery, Instructor, 医学部, 講師 (80113736)

Co-Investigator(Kenkyū-buntansha) 遠山 義浩  旭川医科大学, 医学部, 助手 (70261419)
米増 祐吉  旭川医科大学, 医学部, 教授 (30038666)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordshypothermia / cerebral blood flow / glucose metabolism / nitric oxide / adenosine / Autoradiography rat / NO / rat
Research Abstract

We measured regional cerebral blood flow and glucose metabolism in normothermia and hypothermia. We also measured nitric oxide and adenosine by microdialysis.
Temperature of parietal cortex and caudate nucleus at 37゚C (rectal temperature) was 36.5*0.3゚C and 36.7*0.2゚C respectively, When the body temperature was kept at 30゚C, temperature of parietal cortex and caudate nucleus decreased to 29.1*0.2 and 29.6*0.3゚C respectively. Blood pressure decreased slightly at 30゚C compared with normothermia but was not significant. During hypothermia, regional cerebral metabolic rate of glucose (CMRglu) decreased with relatively uniform rates, ranging from 40% to 55%. There was no significant difference between cerebral cortex and deep-seated nucleus in reduction rates. Regional cerebral blood flow (CBF) of 9 structures during normothermia and hypothermia was compared. CBF decreased significantly in all brain regions during hypothermia, but the reduction rates were variable, ranging from 19-49%. Mean CBF reduction rates in cortex and deep-seated nucleus were 24.2% and 41.6% respectively. Nitric oxide (NO) products decreased during hypothermia but was not significant statistically compared with that of normothermia. However, concentration of adenosine revealed a significant reduction during hypothermia. The magnitude of decrease in adenosine during hypothermia was significant in deep-seated nucleus.
We conclude that CMRglu decreases relatively uniform during hypothermia but CBF dose not decrease in parallel to CMRglu. CBF during hypothermia seems to be regulated by some factors and adenosine is maybe one of these factors.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] Sugimura T: "Consecutive in vivo measurement of nitric oxide in transient forebrain ischemic rat under normothermia and hypothermia." Brain Research. 808. 313-316 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tohyama Y: "Hypothermia attenuates hyperglycolysis in the periphery and ischemic core in rat brain." Exp.Brain Research. 122. 333-338 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sugimura T: "Consecutive in vivo measurement of nitric oxide in transient forebrain ischemic rat under normothermia and hypothermia." Brain Research. 808. 313-316 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tohyama Y: "Hypothermia attenuates hyperglycolysis in the periphery and ischemic core in rat brain." Exp.Brain Research. 122. 333-338 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary

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Published: 1996-04-01   Modified: 2016-04-21  

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