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Fetal systolic time intervals after paracervical block during labor
Acta Obstetricia Et Gynecologica Scandinavica
|January 1, 1980
Summary
Paracervical block (PCB) during labor increases fetal heart intervals and does not cause fetal hypoxia. Fetal circulation may centralize, potentially due to local anesthetic effects on the fetal heart.
Area of Science:
- Obstetrics and Gynecology
- Fetal Physiology
- Anesthesiology
Background:
- Paracervical block (PCB) is used for labor pain relief.
- Concerns exist regarding potential fetal effects of PCB, including hypoxia.
- Fetal systolic time intervals (FSTI) offer insights into fetal cardiac function.
Purpose of the Study:
- To investigate the effects of PCB on FSTI during uterine contractions.
- To assess the correlation between FSTI and fetal well-being.
- To evaluate the impact of PCB on fetal circulation and myometrial dynamics.
Main Methods:
- FSTI were recorded in 25 parturients during the first stage of labor.
- Recordings were taken before and after PCB administration.
- Correlations were analyzed between FSTI, heart rate, and amniotic pressure curves.
Main Results:
- PCB administration led to increased R-R and S1-S2 intervals, indicating prolonged cardiac phases.
- A significant correlation was observed between FSTI and early decelerations.
- FSTI exhibited cyclic variations during uterine contractions, suggesting blood transfer between fetus and placenta.
Conclusions:
- PCB does not appear to cause fetal hypoxia or reduce maternal placental circulation.
- Observed FSTI changes suggest fetal circulatory centralization, possibly influenced by local anesthetics.
- Cyclic FSTI variations during contractions are likely due to placental-fetal blood transfer, supported by altered myometrial dynamics.