Evaluation of the Effects of Vibro-Acoustic Stimulation Test on the Fetus during Labor Under Epidural Analgesia and Evidence of its Safety by Way of Auditory Brainstem Response

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  • MORIKAWA,Shigetoshi
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • ISHIKAWA,Junko
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • MATSUBARA,Hidetaka
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • NAGATA,Fumitaka
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • NOMURA,Yoshihisa
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • KAMATSUKI,Hiroshi
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • SHINZATO,Yasutaka
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • YAMAGUCHI,Yoko
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • NIWA,Kuniaki
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • KANAKURA,Youichi
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital
  • KOMETANI,Kunio
    Department of Obstetrics and Gynecology, Fujita Health University, Banbunrine-Houtokuhai Hospital

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Other Title
  • 硬膜外麻酔分娩時におけるVibro-Acoustic Stimulation Testによる胎児評価とその安全性の検討

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Abstract

This study was undertaken to elucidate the effects of epidural analgesia on vibro-acoustic stimulation test (VAST) during normal labor and auditory brainstem response (ABR) in fifty full term parturients without any complication. The safety of VAST in relation to the ABR of neonates was also studied. The results were as follows, 1) There were some changes in CTG monitoring in five cases (10%) in the 10 minutes after epidural analgesia. However, these changes were not ominous signs but all reIated to the coiling of the cord, as previously reported. 2) The ABR latency-intensity curve (audiofunction of the newborn infants) revealed no hazardous change in VAST-loaded infants or in the controls. The response threshold was 10dB in this study. The application of VAST to the parturients under epidural analgesia was therefore not only harmless to the fetuses but also a useful way to evaluate fetal well-being.

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