Key result
FHR responses shift from transient accelerations in early labour to decelerations as labour progresses.
Why the study?
The significance and progression of less emphasized fetal heart rate response patterns throughout labour were not well characterized.
Observational (n=70)
Fetal heart rate responses to uterine contractions show a distinct progression from transient accelerations in early labour to decelerations as labour advances.
A study of 70 fetal heart rate (FHR) traces throughout labour has allowed analysis of FHR responses associated with approximately 7000 individual uterine contractions. The significance of the less emphasized FHR patterns has been assessed and an attempt has been made to identify any trend or progression in the occurrence of these patterns. Transient acceleration was the most frequently occurring response in early labour and was the first observed response in the majority of cases. Decelerations became prevalent as labour progressed. A hypothesis is proposed to explain the observed overall progression in FHR responses and the possible physiological mechanisms underlying the cyclic changes in response patterns which occur throughout the course of labour.
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Liu et al. (1975) conducted an observational in Labour (n=70). Labour progression was evaluated on Fetal heart rate (FHR) response patterns. Transient acceleration was the most frequent fetal heart rate response in early labour, whereas decelerations became prevalent as labour progressed.
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