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Effect of umbilical cord occlusion on behavior and neurohistology in sheep fetus.

Research Project

Project/Area Number 17591749
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Obstetrics and gynecology
Research InstitutionUniversity of Miyazaki

Principal Investigator

KAWAGOE Yasuyuki  University of Miyazaki, Faculty of Medicine, Dept.Ob&Gy, Assistant Professor (70336311)

Co-Investigator(Kenkyū-buntansha) SAMESHIMA Hiroshi  University of Miyazaki, Faculty of Medicine, Dept.Ob&Gy, Associate Professor (50274775)
IKENOUE Tsuyomu  University of Miyazaki, Faculty of Medicine, Dept.Ob&Gy, Professor (60232211)
坂本 紘  鹿児島大学, 農学部, 教授 (20041650)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2005: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordsintermittent umbilical cord occlusion / variable deceleration / non-acidemic hypoxemia / fetal brain damage / 変動制一過性徐脈 / アシドーソスを伴わない低酸素血症 / 低酸素症 / 新生児脳症 / 臍帯因子
Research Abstract

Objectives : Neurologic deficit in children can be attributed to prenatal events and asphyxial insults. In human pregnancies near term, intermittent 'variable type' fetal heart rate (FHR) decelerations are seen in 5% and can be associated with umbilical cord occlusion (UCO). Effect of intermittent UCO on neurohistology in fetus is determined. Clinical detection for hypo-perfusion of the fetal brain is also investigated
Methods : 14 chronically instrumented fetal sheep (experimental, n=7, Control, n=7) at 0.8 gestation were studied over 4 days with UCOs by complete inflation of an occluder cuff (duration 90 seconds) every 30 minutes for 3 to 5 hours each day. Animals were then euthanized and the fetal brains were prepared for subsequent histology and immunostaining for myelin(SCR), astrocytes(GFAP), and activated microglia(HLADR). Brain injury was scored by a neuropathologist, based on the severity of injury by histopathology and changes in immunostaining ; 0-normal, 1-minimal, 2-mild/ea … More rly, 3-moderate to severe/advanced. We also studied the circulatory change by using blood pressure and SpO_2 charges in goat fetus. These experiments were conducted in the Department of Veterinary Medicine of Kagoshima University and Department of Obstetrics and Gynecology of Western Ontario University, Canada.
Results : Fetal PO_2 decreased from 24.0±0.5 to 6.7±0.8mmHg whereas change of PH was from 7.36 to 7.31. All the experiment group showed minimal injury (increased staining of GFR and/or HLADR) or mild injury (plus in ischemic neurons in cortex). Brain injury score for controls was significantly lower, averaging 0.4±0.25(p<0.01) with one animals having minimal injury and 1.6±0.20 in experimental group.
Conclusions : We conclude that intermittent UCO can result in neuropathological change in the cortical and subcortical white and gray matters. We speculate that intermittent UCO may give rise to postnatal neurologic deficit. New technique to detect brain hypo-perfusion is required in clinical settings. Less

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (3 results)

All 2006

All Journal Article (3 results)

  • [Journal Article] 胎児心拍数variabilityとFetal origins of rhythm disorder2006

    • Author(s)
      川越靖之
    • Journal Title

      日本周産期・新生児医学会雑誌 42巻4号

      Pages: 804-809

    • NAID

      10017616731

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Fetal heart rate variability and fetal origins rhythm disorder2006

    • Author(s)
      Kawagoe Y
    • Journal Title

      Journal of Japan Society of Perinatal and Neonatal Medicine 42(4)

      Pages: 804-809

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 胎児心拍数variabilityとFetal origins of rhythm disorder2006

    • Author(s)
      川越 靖之
    • Journal Title

      日本周産期・新生児医学会雑誌 42巻4号

      Pages: 804-809

    • NAID

      10017616731

    • Related Report
      2006 Annual Research Report

URL: 

Published: 2005-04-01   Modified: 2016-04-21  

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