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Variable fetal heart rate decelerations and electrocortical activities.

Y Murata·E J Quilligan·Y Ninomiya·A Wakatsuki·N Masaoka·S Oka·K Fujimori
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Abstract

OBJECTIVE: The purpose of this study was to examine the influence of fetal behavioral states on baroreflex-mediated, variable fetal heart rate decelerations caused by umbilical cord occlusion. STUDY DESIGN: Five chronically instrumented fetal lambs were subjected to intermittent partial umbilical cord occlusion for 1 minute every 3 minutes, lasting 2 hours. Fetal behavioral states determined by electrocorticogram and heart rates by electrocardiogram were monitored continuously during these experiments. RESULTS: The fetuses exhibited an alteration between low- and high-voltage electrocorticogram states. Both the depth and width of the variable fetal heart rate decelerations were greater during high-voltage than during low-voltage electrocorticogram. CONCLUSION: Amplitude and duration of variable fetal heart rate decelerations are affected by fetal behavioral states.

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AnimalsBehavior, AnimalCarbon DioxideConstrictionElectroencephalographyFemaleFetal BloodHeart Rate, FetalHydrogen-Ion ConcentrationOxygenPregnancySheepUmbilical CordJournal Article

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Y Murata, E J Quilligan, Y Ninomiya, A Wakatsuki, N Masaoka, S Oka, K Fujimori. 1994. Variable fetal heart rate decelerations and electrocortical activities.. https://doi.org/10.1016/s0002-9378(94)70249-7

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