The Relationship between Flow Velocity Waveforms of Umbilical and Fetal Middle Cerebral Arteries and Cord Blood Gas Values

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  • SEKIZUKA,Naoto
    Department of Obstetrics and Gynecology, Niigata University School of Medicine
  • MURAKOSHI,Takeshi
    Department of Obstetrics and Gynecology, Niigata University School of Medicine
  • YOSHIZAWA,Hiroshi
    Department of Obstetrics and Gynecology, Niigata University School of Medicine
  • TANAKA,Kenichi
    Department of Obstetrics and Gynecology, Niigata University School of Medicine
  • HANAOKA,Jinichi
    Department of Obstetrics and Gynecology, Niigata City General Hospital
  • TAKEUCHI,Yutaka
    Department of Obstetrics and Gynecology, Niigata City General Hospital
  • TOKUNAGA,Akiteru
    Department of Obstetrics and Gynecology, Niigata City General Hospital

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Other Title
  • 臍帯動脈および胎児中大脳動脈血流速度波形と臍帯血ガス値の相関に関する検討

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Umbilical artery (UA) and fetal middle cerebral artery (MCA) flow velocity waveforms were obtained from 55 fetuses just prior to elective cesarean section at 36～39 weeks of gastation and the resistance index (RI) was calculated for each waveform. Cord blood samples were obtained from both the umbilical artery and the vein at cesarean section and the blood gas values were measured immediately. The coefficients of correlation between the cord blood gas values and the resistance indices were obtained. 1. UA-RI had a significant negative correlation with pH and P_<O_2>, and a positive correlation with P_<CO_2>. 2. MCA-RI had a significant positive correlation with pH and P_<O_2>, and a negative correlation with P_<CO_2>. 3. The UA-RI/MCA-RI ratio had a significant negative correlation with pH and P_<O_2>, and a positive correlation with P_<CO_2>. 4. The best correlation was found in the UA-RI/MCA-RI ratio, and the UA-RI, MCA-RI and UA-RI/MCA-RI ratios had a closer correlation with umbilical arterial blood gas values than with umbilical venous blood gas values. A Doppler study of fetal blood distribution would be a useful method in the noninvasive assessment of the fetal blood gas state at 36～39 weeks of gestation.

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