Preterm and term prelabour rupture of membranes: A review of timing and methods of labour induction

PROM at term: when might be the best time to induce labour? A retrospective analysis

PURPOSE

PROM after 37 weeks of gestation occurs in approximately 10% of pregnancies. When spontaneous onset of labour does not follow, induction is recommended to decrease the risk of infection for both mother and child. However, there is no clear consensus on whether induction before 24 h after PROM results in fewer complications compared to induction after > 24 h.

MATERIAL AND METHODS

This retrospective observational study analysed the outcomes of 3174 women with PROM admitted to the delivery room of LMU Women's Hospital between 10/2015 and 09/2020. We evaluated whether timing of labour induction was associated with maternal or newborn postpartum infection rates.

RESULTS

Comparing women with spontaneous onset of labour to those who underwent induction, no significant differences were found in maternal CRP or leukocyte levels, fever, endometritis, or Group B streptococcus colonization. However, intrapartum antibiotic therapy was significantly higher in the induction group. When the induction group was subdivided based on the interval from PROM to induction, no significant differences were observed in maternal infection parameters, need for antibiotics, postpartum length of hospital stay, or endometritis. For newborn infections, a significant difference in CRP levels was found, with higher levels in the groups with "induction < 12 h" and "> 24 h".

CONCLUSION

The presented data suggests that waiting for spontaneous contractions within the first 24 h after PROM was not associated with the risk of infection if no initial signs for infection are present. However, beyond 24 h, the risk of infection increased. These findings support current recommendations regarding the timing of induction after PROM.

Impact of partial prelabor rupture of membranes at term on labor and on obstetrical and neonatal outcomes: A retrospective case-control study

OBJECTIVE

This study aimed to assess whether a partial term prelabor rupture of membranes (partial TPROM) had an impact on the spontaneous onset of labor compared to complete TPROM.

METHODS

We performed a retrospective study in a French level III maternity hospital. We included all singleton cephalic pregnancies presenting with prelabor rupture of membranes ≥37 weeks gestational age. Patients with a partial TPROM (P group) were compared to patients with a complete TPROM (C group). Induction of labor was performed following expectative management of 24-48 h, and antibiotic prophylaxis was started 12 h after rupture. Our main outcome measure was the rate of patients who had spontaneous labor 24 h following prelabor rupture.

RESULTS

Overall, 389 women were included in the study, 148 in the P group, 241 in the C group. The proportion of women who went into spontaneous labor in the 24 h following TPROM was significantly lower in the P group (45% vs 64%, P < 0.001). A partial TPROM was a predictive factor for absence of labor at 24 h following rupture (adjusted odds ratio: 0.44 [0.29-0.68]). There were more cases of induction of labor (50% vs 20%, P < 0.001) and antibiotic prophylaxis (91% vs 73%, P < 0.001) in the P group. However, obstetrical and neonatal outcomes were comparable between the two groups.

CONCLUSION

Compared to complete TPROM, partial TPROM is associated with a lower probability of spontaneous labor in the 24 h following rupture. The persistence of a residual membrane has been identified as a risk factor for delaying labor beyond 24 h.

Escherichia coli induced matrix metalloproteinase-9 activity and type IV collagen degradation is regulated by progesterone in human maternal decidual

BACKGROUND

Escherichia coli (E. coli) is one of the main bacteria associated with preterm premature rupture of membranes by increasing pro-matrix metalloproteinase 9 (proMMP-9) and degradation of type IV collagen in human feto-maternal interface (HFMi). proMMP-9 is regulated by progesterone (P4) but it is unclear whether P4 inhibits proMMP in human maternal decidual (MDec). This study aimed to determine a role of P4 on proMMP-2 and - 9 and type IV collagen induced by E. coli infection in MDec.

METHODS

Nine HFMi were mounted in a Transwell system. MDec was stimulated with P4 or E. coli for 3-, 6-, or 24-hours. proMMP-2, -9 and type IV collagen were assessed.

RESULTS

Gelatin zymography revealed an increase in proMMP-9 after 3, 6, and 24 h of stimulating MDec with E. coli. Using immunofluorescence, it was confirmed the increase in the HFMi tissue and a reduction on the amount of type IV collagen leading to the separation of fetal amniochorion and MDEc. The degradative activity of proMMP-9 was reduced by 20% by coincubation with P4.

CONCLUSIONS

P4 modulates the activity of proMMP-9 induced by E. coli stimulation but it was unable to completely reverse the degradation of type IV collagen in human MDec tissue.

Exposure to mixtures of PM2.5 components and term premature rupture of membranes: a case-crossover study in Shijiazhuang, China

This study aims to explore the acute effects of short-term exposure to PM2.5 components and their mixture on PROM. Counts of hospital admissions due to PROM were collected at the Fourth Hospital of Shijiazhuang. The associations between the PROM and PM2.5 components was examined using a time-stratified case-crossover approach. The overall effects of components on TPROM were examined using the BKMR. During the study period 30,709 cases of PROMwere identified. The relative risks and the 95% CI of TPROM were 1.013 (1.002, 1.028) and 1.015 (1.003, 1.028) associated with per interquartile range increase in nitrate and ammonium ion on the current day and they were 1.007 (1.001, 1.013) and 1.003 (1.000, 1.005) on the previous day. The results from the BKMR models showed a higher risk of TPROM was associated with exposure to mixtures, in which, nitrate and organic matter were the main contributors to the overall effect.

Prediction of the mode of delivery using artificial intelligence algorithms

BACKGROUND AND OBJECTIVE

Mode of delivery is one of the issues that most concerns obstetricians. The caesarean section rate has increased progressively in recent years, exceeding the limit recommended by health institutions. Obstetricians generally lack the necessary technology to help them decide whether a caesarean delivery is appropriate based on antepartum and intrapartum conditions.

METHODS

In this study, we have tested the suitability of using three popular artificial intelligence algorithms, Support Vector Machines, Multilayer Perceptron and, Random Forest, to develop a clinical decision support system for the prediction of the mode of delivery according to three categories: caesarean section, euthocic vaginal delivery and, instrumental vaginal delivery. For this purpose, we used a comprehensive clinical database consisting of 25,038 records with 48 attributes of women who attended to give birth at the Service of Obstetrics and Gynaecology of the University Clinical Hospital "Virgen de la Arrixaca" in the Murcia Region (Spain) from January of 2016 to January 2019. Women involved were patients with singleton pregnancies who attended to the emergency room on active labour or undergoing a planned induction of labour for medical reasons.

RESULTS

The three implemented algorithms showed a similar performance, all of them reaching an accuracy equal to or above 90% in the classification between caesarean and vaginal deliveries and somewhat lower, around 87% between instrumental and euthocic.

CONCLUSIONS

The results validate the use of these algorithms to build a clinical decision system to help gynaecologists to predict the mode of delivery.

Optimal timing of labour induction in contemporary clinical practice

Induction of labour (IoL) is generally conducted when maternal and foetal risks of remaining pregnant outweigh the risks of delivery. With emerging literature around non-medically indicated IoL, contemporary clinical practice has seen an increase in IoL at 39 weeks' gestation. This review highlights recent evidence on the most common indications for IoL including gestational diabetes, hypertensive disorders of pregnancy, intrahepatic cholestasis of pregnancy, and post-term pregnancies. It also summarizes the evidence related to the timing of IoL for other common conditions based on recent literature reviews.