Associations Among Intrapartum Interventions and Cesarean Birth in Low-Risk Nulliparous Women with Spontaneous Onset of Labor

Trends in induction of labour and associated co-morbidities and demographics in Queensland, Australia from 2001 to 2020: a population-based study

BACKGROUND

Amongst women who plan a vaginal birth at term, previous studies have reported that rates of induction of labour are increasing potentially impacting other labour and birth outcomes. Indications for induction of labour (IOL) have changed over time though the influences of parity and demographic factors such as age, ethnicity and regionality are not often considered. The aim of this study was to describe the changes in demographic, co-morbidity, IOL indication and clinical outcomes in women undertaking a planned cephalic vaginal birth at term over a 20 year period.

METHODS

A retrospective population-based study was undertaken using routinely collected anonymised perinatal data from Queensland, Australia from January 2001 to December 2020. We included all singleton term (≥ 37 weeks) planned vaginal births. A total of 836,065 births met the study criteria. Data for pregnancy complications and IOL indications were grouped by ICD-10 codes. Analysis was stratified by parity and presented as frequency and percentages over time and the difference in percentages between two defined years.

RESULTS

Rates of IOL increased by 15.5% (31.6 to 47.1%) in nulliparous and 14.6% (26.2 to 40.8% in multiparous women, most notable from 2015 onwards. Over the same period infants born between 37 and 38 weeks gestation increased by 13.9%. (18.1-32%). Amongst co-morbidities gestational diabetes increased from 3.8 to 12.8% and anaemia from 1.7 to 8.1%. As an indication for IOL prolonged pregnancy decreased from 41.0 to 11.2%. In nulliparous women the percentage of intact perineum decreased from 21.3 to 6.7% while episiotomy increased from 20.2 to 38.8%.

CONCLUSIONS

We conclude that for women planning a vaginal birth not only has the rate of IOL increased substantially over the last two decades there also appears to be considerable interaction between demographic, co-morbidity, IOL indications and clinical outcomes that warrants further large population-based research.

Reduced risk of cesarean delivery with oxytocin discontinuation in active labor: a systematic review and meta-analysis

OBJECTIVE

Our objective was to determine if oxytocin discontinuation in the active phase of labor impacts the rate of cesarean delivery compared to continuation of oxytocin.

DATA SOURCES

This study was a systematic review and meta-analysis of randomized controlled trials. A research librarian performed a database search using a combination of standardized terms and keywords related to oxytocin discontinuation and stages of labor from database inception until February 2024. This protocol was registered in The International Prospective Register of Systematic Reviews (PROSPERO).

STUDY ELIGIBILITY CRITERIA

Randomized controlled trials of pregnant patients who received oxytocin for induction or augmentation of labor, whose outcomes compared discontinuation and continuation of oxytocin in active labor, were included. We defined "active phase of labor" as defined by each trial. Nonrandomized trials, quasi-randomized trials, and animal models were excluded. The primary outcome was the rate of cesarean delivery. Secondary maternal outcomes included postpartum hemorrhage, total blood loss, and infectious outcomes. Secondary neonatal outcomes included Apgar score at 5 minutes <7, umbilical arterial pH <7.10, neonatal therapeutic hypothermia, neonatal intensive care unit admission, neonatal resuscitation at birth, and neonatal death.

STUDY APPRAISAL AND SYNTHESIS METHODS

The risk of bias in each study was assessed using the guidelines outlined in the Cochrane Handbook for Systematic Reviews of Interventions. Heterogeneity was measured using Higgins I2. Meta-analysis was performed in Review Manager 5.4.1 and StataSE 16 to determine summary treatment effects in terms of relative risk or mean difference with 95% confidence intervals. The adherence of each included trial to the trustworthiness criteria outlined by the OBGYN Editors' Integrity Group was assessed, and a leave-1-out analysis was performed to evaluate the effect of studies with concerns regarding trustworthiness.

RESULTS

Fifteen randomized controlled trials, including 5734 patients, were ultimately included in the meta-analysis. The rate of cesarean delivery, reported in 13 studies, was lower with discontinuation of oxytocin in the active phase of labor (relative risk=0.80; 95% confidence interval, 0.66-0.97; 95% prediction interval, 0.38-1.22). Discontinuation of oxytocin was also associated with a lower risk of uterine tachysystole (relative risk=0.45; 95% confidence interval, 0.34-0.60; I2, 26%), and nonreassuring fetal heart rate tracing (relative risk=0.64; 95% confidence interval, 0.49-0.82; I2, 41%). Discontinuation of oxytocin increased the duration of active labor by an average of 30 minutes and second stage of labor by an average of 6 minutes.

CONCLUSION

Although associated with an extension of labor by half an hour, discontinuation of oxytocin in the active phase of labor was associated with a 20% decreased risk of cesarean delivery and a lower risk of uterine tachysystole and nonreassuring fetal heart rate tracing. While the pooled analysis suggests a beneficial effect, this finding is dependent on the inclusion of studies with concerns regarding trustworthiness.

Is Oxytocin Administration During Childbirth Associated With Increased Risk for Postpartum Posttraumatic Stress Symptoms?: A Preliminary Investigation

INTRODUCTION

Synthetic oxytocin is one of the most regularly administered medications to facilitate labor induction and augmentation. The present study examined the associations between oxytocin administration during childbirth and postpartum posttraumatic stress symptoms (PTSS).

MATERIALS AND METHODS

In a multicenter longitudinal study, women completed questionnaires during pregnancy and at 2 months postpartum ( N = 386). PTSS were assessed with the Impact of Event Scale. Logistic regression was used to examine the difference in PTSS at Time 2 between women who received oxytocin and women who did not.

RESULTS

In comparison with women who did not receive oxytocin, women who received oxytocin induction were 3.20 times as likely to report substantial PTSS ( P = .036, 95% confidence interval: 1.08-9.52), and women who received oxytocin augmentation were 3.29 times as likely to report substantial PTSS ( P = .036, 95% confidence interval: 1.08-10.03), after controlling for being primiparous, preeclampsia, prior mental health diagnosis, mode of birth, postpartum hemorrhage, and satisfaction with staff.

DISCUSSION

Oxytocin administration was associated with a 3-fold increased risk of PTSS. The findings may reflect biological and psychological mechanisms related to postpartum mental health and call for future research to establish the causation of this relationship.

Shared Decision-Making During Labor and Birth Among Low-Risk, Active Duty Women in the U.S. Military

INTRODUCTION

The cesarean birth rate of 24.7% in the Military Health System (MHS) is lower than the national rate of 31.7%. However, the MHS rate remains higher than the 15-19% threshold associated with optimal maternal and neonatal outcomes. For active duty servicewomen, increased morbidity associated with cesarean birth is likely to affect the ability to meet the demands of assigned missions. Several decision-points occur during pregnancy and after the onset of labor that can affect the likelihood of cesarean birth including choice of provider, choice of hospital, timing of admission, and type of fetal monitoring. Evidence suggests the overuse of labor interventions may be associated with cesarean birth. Shared decision-making (SDM) is a strategy that can be used to carefully consider the risks, benefits, and alternatives of each labor intervention and is shown to be associated with positive patient outcomes. Most existing evidence explores SDM as an interaction that occurs between women and their providers. Few studies have explored the role of stakeholders such as spouses, family members, friends, labor and delivery nurses, and doulas. Furthermore, little is known about the process of SDM during labor and childbirth in the hospital setting, particularly for active duty women in the U.S. military. The purpose of this study was to propose a framework that explains the process of SDM during labor and childbirth in the hospital setting for active duty women in the U.S. military.

MATERIALS AND METHODS

A qualitatively driven mixed-methods approach was conducted to propose a framework that explains the process of SDM during labor and childbirth in the hospital setting for active duty women in the U.S. military. Servicewomen were recruited from September 2019 to April 2020. Semi-structured interviews were analyzed using a constructivist grounded theory approach. Participants also completed the SDM Questionnaire (SDM-Q-9).

RESULTS

Interviews were conducted with 14 participants. The sample included servicewomen from the Air Force (n = 7), Army (n = 4), and Navy (n = 3). Two participants were enlisted and the remainder were officers. Ten births occurred at military treatment facilities (MTFs) and six births took place at civilian facilities. The mean score on the SDM Questionnaire was 86.7 (±11.6), indicating a high level of SDM. Various stakeholders (e.g., providers, labor and delivery nurses, doulas, spouses, family members, and friends) were involved in SDM at different points during labor and birth. The four stages of SDM included gathering information, identifying preferences, discussing options, and making decisions. Events that most often involved SDM were deciding when to travel to the hospital, deciding when to be admitted, and selecting a strategy for pain management. Military factors involved in SDM included sources of information, selecting and working with civilian providers, and delaying labor interventions to allow time for an active duty spouse to travel to the hospital.

CONCLUSIONS

SDM during labor and birth in the hospital setting is a multi-stage process that involves a variety of stakeholders, including the woman, members of her social and support network, and healthcare professionals. Future research is needed to explore perspectives of other stakeholders involved in SDM.

Oxytocin Administration in Low-Risk Women, a Retrospective Analysis of Birth and Neonatal Outcomes

BACKGROUND

In recent years, higher than the recommended rate of oxytocin use has been observed among low-risk women. This study examines the relationship between oxytocin administration and birth outcomes in women and neonates.

METHODS

A retrospective analysis of birth and neonatal outcomes for women who received oxytocin versus those who did not. The sample included 322 women with a low-risk pregnancy.

RESULTS

Oxytocin administration was associated with cesarean section (aOR 4.81, 95% CI: 1.80-12.81), instrumental birth (aOR 3.34, 95% CI: 1.45-7.67), episiotomy (aOR 3.79, 95% CI: 2.20-6.52) and length of the second stage (aOR 00:18, 95% CI: 00:04-00:31). In neonatal outcomes, oxytocin in labor was associated with umbilical artery pH ≤ 7.20 (OR 3.29, 95% CI: 1.33-8.14). Admission to neonatal intensive care unit (OR 0.56, 95% CI: 0.22-1.42), neonatal resuscitation (OR 1.04, 95% CI: 0.22-1.42), and Apgar score <7 (OR 0.48, 95% CI: 0.17-1.33) were not associated with oxytocin administration during labor.

CONCLUSIONS

Oxytocin administration during labor for low-risk women may lead to worse birth outcomes with an increased risk of instrumental birth and cesarean, episiotomy and the use of epidural analgesia for pain relief. Neonatal results may be also worse with an increased proportion of neonates displaying an umbilical arterial pH ≤ 7.20.