Labor Induction Versus Expectant Management for Postterm Pregnancies: A Systematic Review With Meta-analysis

Induction of Labour in a District Hospital of Rural Nepal: A Descriptive Cross-sectional Study

INTRODUCTION

Induction of labour, a medical intervention before spontaneous onset, is employed when the risk of continuing pregnancy is elevated. Common indications include intrauterine growth restriction, preeclampsia, gestational diabetes, placental abnormalities, prelabor rupture of membranes, post-term pregnancy, and intrauterine foetal demise. The objective of this study was to find out the prevalence of induction of labour in a rural setting in Nepal.

METHODS

We conducted a descriptive cross-sectional study in the District Hospital Tehrathum using patients' record files from 14 January 2021 to 14 January 2023. Ethical approval was obtained from Nepal Health Research Council. Demographic variables were collected along with maternal outcomes which include indication of induction of labour, mode of delivery, indication of lower segment caesarean section and foetal outcomes include APGAR score at one and five minutes, birthweight and liquor colour. A total population sampling method was used in the study and 95% confidence Interval was used to calculate the point estimate.

RESULTS

Among 640 deliveries during the study period 118 (18.43%) (15.43- 21.43, 95% Confidence Interval) underwent induction of labour. Sixty-three (53.4%) of the 118 patients who underwent induction of labour were primigravida.

CONCLUSIONS

The prevalence of induction of labour was comparable with previous studies. Neonatal outcome, rate of vaginal and lower segment C-section deliveries after induction of labour using misoprostol is comparable with other studies.

Oxytocin induced labor causes region and sex-specific transient oligodendrocyte cell death in neonatal mouse brain

AIM

Previous reports showed associations between oxytocin induced labor and mental disorders in offspring. However, those reports are restricted in epidemiological analyses and its mechanism remains unclear. In this study, we hypothesized that induced labor directly causes brain damage in newborns and results in the development of mental disorders. Therefore we aimed to investigate this hypothesis with animal model.

METHODS

The animal model of induced labor was established by subcutaneous oxytocin administration to term-pregnant C57BL/6J mice. We investigated the neonatal brain damage with evaluating immediate early gene expression (c-Fos, c-Jun and JunB) by quantitative polymerase reaction and TdT-mediated dUTP nick end labeling staining. To investigate the injured brain cell types, we performed double-immunostaining with TdT-mediated dUTP nick end labeling staining and each brain component specific protein, such as Oligo2, NeuN, GFAP and Iba1.

RESULTS

Brain damage during induced labor led to cell death in specific brain regions, which are implicated in mental disorders, in only male offspring at P0. Furthermore, oligodendrocyte precursors were selectively vulnerable compared to the other cell types. This oligodendrocyte-specific impairment during the perinatal period led to an increased numbers of Olig2-positive cells at P5. Expression levels of oxytocin and Oxtr in the fetal brain were not affected by the oxytocin administered to mothers during induced labor.

CONCLUSION

Oligodendrocyte cell death in specific brain regions, which was unrelated to the oxytocin itself, was caused by induced labor in only male offspring. This may be an underlying mechanism explaining the human epidemiological data suggesting an association between induced labor and mental disorders.