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Fetal heart rate pattern before and after paracervical anesthesia. A prospective study
B M Carlsson1, M Johansson, B Westin
1Department of Obstetrics and Gynecology, Danderyd Hospital, Sweden.
Acta Obstetricia Et Gynecologica Scandinavica
|January 1, 1987
Summary
Paracervical blockade (PCB) during labor may increase fetal heart rate decelerations but does not appear to affect long-term infant development. Most infants experiencing bradycardia after PCB recovered well and showed normal Apgar scores and development.
Area of Science:
- Obstetrics and Gynecology
- Anesthesiology
- Fetal Medicine
Background:
- Paracervical blockade (PCB) is a common analgesia technique during labor.
- The effects of PCB on fetal heart rate (FHR) patterns require thorough investigation.
Purpose of the Study:
- To evaluate changes in fetal heart rate (FHR) patterns following paracervical blockade (PCB) during labor.
- To assess the incidence and outcomes of fetal bradycardia after PCB.
Main Methods:
- Prospective study of 469 women undergoing labor with PCB.
- Fetal heart rate monitored via scalp electrode 15 minutes before and 30 minutes after PCB.
- Anesthetic: Bupivacaine (0.25% or 1.25%) administered at four points during cervical dilation of 3-9 cm.
Main Results:
- Fetal decelerations increased post-PCB, with a mean basal rhythm decrease of 1.5 beats/min.
- Fetal bradycardia occurred in 1.9% of cases, persisting for an average of 6.5 minutes.
- All infants with bradycardia had Apgar scores of 9-10/5 min and normal 2-year development; 6/9 had pre-existing risk factors.
Conclusions:
- PCB is associated with transient fetal heart rate changes, including increased decelerations and occasional bradycardia.
- PCB does not appear to negatively impact infant Apgar scores or long-term neurodevelopmental outcomes.
- Fetal bradycardia following PCB, while observed, generally resolves without adverse consequences.