Acta Obstetricia et Gynecologica Scandinavica 1985
Effect of acute hypoxia on human fetal heart rate. The significance of increased heart rate variability.
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Abstracto
The fetal heart rate response to acute hypoxemia was observed during an accidental drop in oxygen concentration inspired by the mother in labor. There was a marked increase in FHR variability in the early stage of hypoxia and also during the recovery phase. While an increase in fetal heart variability is generally considered to be a normal physiological event, it may also indicate a state of fetal hypoxemia associated with an intact fetal circulation, and should be treated with caution during labor.