Factors associated with adverse perinatal outcome in the Term Breech Trial

Vaginal breech delivery in all-fours position-Hands off instead of intervention: A prospective observational study

INTRODUCTION

Vaginal delivery in cases of breech presentation is considered potentially stressful for the newborn. The maternal upright position may represent a more physiological approach to facilitating birth. We compare the safety and efficacy of two maternal positions in vaginal breech delivery.

MATERIAL AND METHODS

A prospective, single-center, observational cohort study from October 2006 to January 2021 in a high-level obstetric center, in Salzburg, Austria. Vaginal breech deliveries in maternal all-fours position (n = 140) were compared with those in assisted supine position (n = 92). The primary outcome measures for neonatal morbidity included Apgar scores, pH levels, and the rate of transfer to the Neonatal Intensive Care Unit (NICU) postdelivery.

RESULTS

In the all-fours position, 51.4% (n = 72) of deliveries occurred without obstetric intervention. The second stage of labor was significantly shorter in the supine position (39.5 min [95% CI 28-47] versus all fours position 52 min [95% CI 42-63], p = 0.042). Umbilical artery pH levels did not differ significantly (7.21 [95% CI 7.19-7.23] versus 7.19 [95% CI 7.17-7.21] vs. p = 0.06). Nor did the APGAR scores at 5 and 10 min below eight (p = 0.697; p = 0.760). Maternal and neonatal morbidity also did not significantly differ. Transfer of neonates to NICU n = 12 (13%) versus n = 11 (7.9%), p = 0.097, transfer birth-related n = 6 (6.5%) versus n = 8 (5.7%), p = 0.803. The number of postpartum umbilical artery pH < 7.10 were n = 9 (9.8%) versus n = 28 (20%), p = 0.065. There was one reported neonatal death due to intracerebral hemorrhage in the supine position group.

CONCLUSIONS

Our results indicate that vaginal breech delivery in the all-fours position seems to be comparable to supine position regarding neonatal safety. Additionally, the all-fours position shows potential for emergency management for unplanned breech deliveries by inexperienced attendants.

Managing Uncomplicated Singleton Breech Pregnancy Using the OptiBreech Collaborative Care Pathway: Early Economic Model and Value of Information Analysis

OBJECTIVES

Management of breech presentation is a subject of ongoing clinical debate. The cost-effectiveness of improving safe vaginal breech birth is unknown. This study examines potential cost-effectiveness of OptiBreech collaborative care and assesses value of undertaking further research.

METHODS

A decision tree was used to evaluate the potential cost-effectiveness of OptiBreech care versus standard care for a hypothetical cohort of women with confirmed singleton breech pregnancy after 36 + 0 weeks gestation and babies born thereafter for 1 year. Probabilities, costs, and outcomes were obtained from literature and OptiBreech pilot trial. Uncertainty and value of information were analyzed to prioritize future research. The main outcomes were incremental cost-utility and cost-effectiveness ratios, net benefits, cost-effectiveness acceptability curve, and expected value of perfect and perfect partial information.

RESULTS

Using preexisting evidence, OptiBreech care is less effective but sufficiently less costly, ie, cost-effective compared with standard care. Influential parameters include cephalic birth rate after external cephalic version, training costs, and vaginal birth rate after opting for vaginal birth. Emerging evidence for OptiBreech care significantly improved the cost-effectiveness ratio. The expected population value of perfect information was £31.5 million, with utilities identified as key research priority.

CONCLUSIONS

Planned vaginal birth for singleton breech pregnancy may be cost-effective despite a potential loss in health outcomes. Emerging data on the effectiveness of OptiBreech care significantly increased the cost-effectiveness likelihood. Conclusions did not change for litigation cost assumptions or for sole neonatal perspective. Further research on health utilities would provide a valuable reduction in decision uncertainty.

Digital vs formal teaching of vaginal breech delivery: Which is the residents' choice?

OBJECTIVE(S)

A critical area of obstetrics that demands proficient training is the management of breech deliveries. There was a notable decline in the number of vaginal breech deliveries in the following years, establishing CS as the preferred method of delivery for such cases. Cohort studies using targeted screening and skilled practitioners demonstrated little differences between the two delivery. Skills acquisition at the patient's bedside is very difficult to obtain, particularly in the youngest trainees. Simulation teaching has largely become a part of the training curricula for many obstetrics and gynecology residency programs.

STUDY DESIGN

This was a prospective, randomized, controlled, single-center study. Residents were randomly assigned in two groups with similar characteristics. Group A attended a formal lecture. Group B received the study material and recording of the lecture as digital home learning. Lecture and simulation focused on vaginal breech delivery. After one month both groups underwent a simulation test addressed to assist a vaginal breech birth. Four supervisors evaluated all videos. Time needed for birth, and evaluation scales as Objective Structured Clinical Examination were recorded. A questionnaire was completed online using Google Forms with 6 questions. The primary outcome was to compare the evaluation for each item and globally within groups. A secondary outcome was the evaluation of questionnaire results within the two groups.

RESULTS

Thirty-two participants were recruited and randomized. None of the participants withdrew from the study. For the primary outcome, all examined variables (Time, Rumping, Legs, Body, Arms, Head, Total Point) did not present differences in supervisors' evaluations. For the secondary outcome, Group B showed higher values in two questions.

CONCLUSION(S)

The major finding of our study is that digital learning and formal lecture presented similar results on resident knowledge. Teaching programs involving mannequin simulation - both high and low fidelity - are reproducible and efficient for skill retain in obstetric emergencies, particularly in low incidence emergencies. The main limitation of our study was the small sample size. In addition, it is possible that a scenario without deviation or a lecture more focused on possible deviation from normal could modify residents' results facing breech delivery.

Mechanics of vaginal breech birth: Factors influencing obstetric maneuver rate, duration of active second stage of labor, and neonatal outcome

BACKGROUND

We investigated possible parameters that could predict the need for obstetric maneuvers, the duration of the active second stage of labor (i.e., the duration of active pushing), and short-term neonatal outcome in vaginal breech births.

MATERIALS AND METHODS

We performed a retrospective analysis of 268 successful singleton vaginal breech births in women without previous vaginal births from January 2015 to August 2022. Multivariable regression was used to investigate associations between maternal and fetal characteristics (including antepartum magnetic resonance (MR) pelvimetry) with obstetric maneuvers, the duration of active second stage of labor, pH values, and admission to the neonatal unit. Models for the prediction of obstetric maneuvers were built and internally validated.

RESULTS

Obstetric maneuvers were performed in a total of 130 women (48.5%). A total of 32 neonates (11.9%) had to be admitted to the neonatal unit. The intertuberous distance (ITD) (p < 0.001), epidural analgesia (p < 0.001), and birthweight (p = 0.026) were associated with the duration of active second stage of labor. ITD (p = 0.028) and birthweight (p = 0.011) were also independently associated with admission to the neonatal unit, while pH values below 7.10 dropped significantly (p = 0.0034) if ITD was ≥13 cm. Furthermore, ITD (p < 0.001) and biparietal diameter (p = 0.002) were independent predictors for obstetric maneuvers.

CONCLUSIONS

ITD is independently associated with the duration of active second stage of labor. Thus, it can predict suboptimal birth mechanics in the last stage of birth, which may lead to the need for obstetric maneuvers, lower arterial pH values, and admission to the neonatal unit. Consequently, MR pelvimetry gives additional information for practitioners and birthing people preferring a vaginal breech birth.

Contraindications in national guidelines for vaginal breech delivery at term: Comparison, consensus, and controversy

INTRODUCTION

The optimal mode of delivery for vaginal breech presentation remains a clinical dilemma. Planned vaginal delivery offers maternal advantages because it avoids major abdominal surgery and has no consequences for following pregnancies, while elective cesarean delivery proves advantageous for the neonate because adverse outcomes are less frequent. Patient selection for vaginal breech delivery is important based on the individual risk balance. A lack of consensus exists regarding the specific contraindications for vaginal breech delivery, largely due to limited scientific evidence. This systematic review aims to give an overview of contraindications for vaginal breech delivery, as presented in guidelines, analyze relevant literature, and offer evidence-based recommendations for the contraindications stated in the guidelines.

MATERIAL AND METHODS

To identify national guidelines PubMed, the Cochrane Central Register of Controlled Trials, EMBASE, NICE, UpToDate, and ClinicalKey were searched using two keywords: "breech presentation" and "vaginal delivery." We systematically reviewed the literature for existing evidence for contraindications for term vaginal breech delivery. The following databases were searched: PubMed (April 2024), the Cochrane Central Register of Controlled Trials, and EMBASE (1947 to 2024).

RESULTS

Our search identified eight guidelines that stated a total of 11 contraindications for vaginal breech delivery. Among these guidelines, agreement was limited, with the sole consensus in all guidelines on the contraindication of footling breech. Our comprehensive literature search yielded 43 articles discussing 14 potential contraindications. We found supportive evidence for 7 of 11 contraindications from the guidelines, with only substantial and satisfactory evidence for two contraindications.

CONCLUSIONS

The findings of this study underscore the lack of consensus among national guidelines regarding contraindications for term vaginal breech delivery. Furthermore, we found a notable lack of substantial scientific evidence to support these contraindications. In light of these findings, we suggest a reduced list of contraindications in vaginal breech deliveries.

Trial and error - Outcome of breech presentation depending on birth mode and root cause analysis of severe adverse events

OBJECTIVES

The debate about the safest birth mode for breech presentation at term remains unresolved. The comparison of a vaginal breech birth (VBB) with an elective caesarean section (CS) regarding fetal outcomes favors the CS. However, the question of whether attempting a VBB is associated with poorer fetal outcomes is examined in this study. Additionally, the study evaluates factors contributing to a successful VBB and illustrates possible errors in VBB management.

STUDY DESIGN

We performed a retrospective analysis of term breech births over 15 years in a Perinatal Center Level I regarding fetal, maternal, and obstetric outcomes by comparing successful with unsuccessful VBB attempt and all attempted VBB vs. CS including a multivariate analysis of predictors for a successful VBB. A root cause analysis of severe adverse events (SAE) was conducted to evaluate factors leading to poorer fetal outcomes in VBB.

RESULTS

Of 863 breech cases, in 78 % a CS was performed and in 22 % a VBB was attempted, with 57 % succeeding. Comparing successful with unsuccessful VBB attempts, successful VBB showed significantly lower maternal blood loss (p < 0.001) but poorer umbilical arterial pH (UApH) (p < 0.001), while other fetal outcome parameters showed no significant differences. Predictive factors for a successful VBB attempt were a body mass index (BMI) below 30.0 kg/m2 (p = 0.010) and multiparity (p = 0.003). Comparing all attempted VBB to CS, maternal blood loss was significantly higher in CS (p < 0.001), while fetal outcomes were significantly worse in VBB attempts, included poorer Apgar scores (p < 0.001), poorer UApH values (p < 0.001), higher transfer rate to the Neonatal Intensive Care Unit (NICU) (p < 0.001) and higher rate of respiratory support in the first 24 h (p = 0.003).

CONCLUSION

The failed attempt of VBB indicates significantly worse UApH without lower Apgar scores or higher transfer rate to the NICU. The likelihood of a successful VBB is 9% lower with obesity and 2.5 times higher in multiparous women. Attempting a VBB should include detailed pre-labor counseling, regarding predictive success factors, an experienced team, and consistent management during birth.

The influence of epidural anesthesia in pregnancies with scheduled vaginal breech delivery at term: a hospital-based retrospective analysis

INTRODUCTION

Epidural anesthesia is a well-established procedure in obstetrics for pain relief in labor and has been well researched as it comes to cephalic presentation. However, in vaginal intended breech delivery less research has addressed the influence of epidural anesthesia. The Greentop guideline on breech delivery states that there's little evidence and recommends further evaluation.

OBJECTIVE

The aim of this study was to compare maternal and neonatal outcomes in vaginally intended breech deliveries at term with and without an epidural anesthesia.

DESIGN

This study was a retrospective cohort study.

SAMPLE

This study included 2122 women at term with a singleton breech pregnancy from 37 + 0 weeks of pregnancy on and a birth weight of at least 2500 g at the obstetric department of University hospital Frankfurt from January 2007 to December 2018.

METHODS

Neonatal and maternal outcome was analyzed and compared between women receiving "walking" epidural anesthesia and women without an epidural anesthesia.

RESULTS

Fetal morbidity, measured with a modified PREMODA score, showed no significant difference between deliveries with (2.96%) or without (1.79%; p = 0.168) an epidural anesthesia. Cesarean delivery rates were significantly higher in deliveries with an epidural (35 vs. 26.2%, p = 0.0003), but after exclusion of multiparous women, cesarean delivery rates were not significantly different (40.2% cesarean deliveries with an epidural vs. 41.5%, p = 0.717). As compared to no epidurals, epidural anesthesia in vaginal delivery was associated with a significantly higher rate of manual assistance (33.8 versus 52.1%) and a longer duration of birth (223.7 ± 194 versus 516.2 ± 310 min) (both p < 0.0001)".

CONCLUSION

Epidural anesthesia can be offered as a safe option for pain relief without increasing neonatal or maternal morbidity and mortality. Nevertheless, it is associated with a longer birth duration and manually assisted delivery.

Experience of decision-making for home breech birth: An interpretive description

Despite research and recommendations supporting shared decision-making and vaginal birth as a reasonable option for appropriately screened candidates with a term breech pregnancy, cesarean remains the only mode of birth available in most hospitals in the United States. Unable to find care for planned vaginal birth in a hospital setting, some individuals choose to pursue breech birth at home, potentially placing themselves and their infants at increased risk. Through this analysis of qualitative data gathered from a mixed methods study, we explored the experience of decision-making of 25 individuals who left the US hospital system to pursue a home breech birth. Data were gathered through open-ended survey responses (n = 25) and subsequent in-depth, semi-structured interviews (n = 23) and analyzed using an interpretive description approach informed by situational analysis. Five interwoven and dynamic themes were identified in this complex decision-making process: valuing and trusting in normal birth, being "backed into a corner," asserting agency, making an informed choice, and drawing strength from the experience. This study provides a foundation for understanding the experience of decision-making and can inform future research and clinical practice to improve the provision of safe and respectful, person-centered care for breech pregnancy and birth.

Not too fast, not too slow: A review of historical trends in vaginal breech time management

PROBLEM

A lack of consistent professional guidance on when to intervene during emergence (buttocks and anus visible at the introitus to birth of the head) in vaginal breech birth (VBB).

BACKGROUND

Hypoxia and asphyxia are common complications of VBB, especially due to umbilical cord compression around the time of emergence.

AIM

To gain insight into VBB time management trends, the evidence behind these practices and how they may have influenced outcomes.

METHODS

Literature review of obstetric textbooks published between 1960 and 2000 contained in the Wellcome Collection and Royal College of Obstetricians and Gynaecologists Library in London.

FINDINGS

90 textbooks were reviewed. Recommendations for 'safe' intervals between birth of the umbilicus and the head ranged from 5 to 20 min. Many sources focused only on the time required to deliver the head, with 'up to 10 min' being the most common interval described. The review found no mention of cord compression causing concern earlier in breech births than once the umbilicus itself is delivered, nor any evidence to support the recommendations.

DISCUSSION

These findings demonstrate a long-term pattern across the second half of the 20th century, whereby birth attendants were urged not to rush emergence nor delay intervention but were given little clear guidance on optimal timings.

CONCLUSION

Clear, evidence-based guidance should be provided in breech training materials to avoid unnecessary hypoxic injuries, and this guidance should be rigorously evaluated.

Breech presentation induction compared to cephalic presentation: Effectiveness and characteristics

INTRODUCTION

The objective of our study was to compare the effectiveness of induction in cephalic presentations to that of breech presentations as well as the characteristics of the latter and the maternal-fetal morbidity and mortality.

MATERIAL AND METHODS

This was a single-center retrospective study carried out at the Lille University Hospital in the Jeanne de Flandre Maternity Hospital including all patients with a breech fetus for whom an induction was indicated beyond 37 weeks of gestation between January 2014 and December 2020. A matching was performed to include 2 cephalic presentations for one breech presentation. The primary outcome was successful induction defined by two things: passage into the active phase (cervical dilatation > 5 cm) and vaginal delivery.

RESULTS

101 inductions of breech presentations were included and matched to 202 cephalic presentations. After adjustment by BISHOP score, there was no significant difference in the caesarean section rate between the two groups (25.7% in cephalic vs 33.7% in breech, OR 0.67 [CI95% 0.38-1.18]) or in the rate of transition to active phase (80.7% in cephalic vs 82.2% in breech, OR 1.26 [CI95% 0.65-2.44]). Post-partum blood loss was not significantly different between the two groups (14.4% in cephalic vs 12.9% in breech, OR 1.22 [CI95% 0.57-2.57]). Moderate neonatal acidosis was more frequent in the breech group (6,4% in cephalic vs 15,8% in breech, OR 3.04 [CI95% 1.38-6.71]).

CONCLUSION

Induction of breech births beyond 37 weeks of gestation appeared to be as effective as induction of cephalic presentations. There was no difference in the rate of caesarean section and transition to active labor. Maternal morbidity was not increased.

Depression, anxiety and stress in women with breech pregnancy compared to women with cephalic presentation-a cross-sectional study

PURPOSE

This study aims to evaluate the level of psychological distress for women with breech compared to cephalic presentation. We hypothesized, that women with breech presentation have higher levels of depression, stress and anxiety. Secondary objectives were to analyze potential demographic risk factors and comorbidity of psychological distress in breech pregnancy.

METHODS

The breech study group was formed by 379 women with breech presentation. A sample of 128 women with cephalic presentation was recruited during routine clinical care. Depression, anxiety and stress symptoms were ascertained by means of the Depression-Anxiety-Stress-Score (DASS)-21 questionnaire. Categorial data was analyzed with Chi-square or exact test, continuous data with unpaired t test or Mann-Whitney U test. Demographic risk factors were identified using a binary logistic regression model.

RESULTS

Prevalence of psychological distress among women with breech was not higher compared to those of other pregnant women. Symptomatic depression, anxiety and stress affected 5.8%, 14.5% and 11.9% of women with breech, respectively. Decreasing age was identified as a risk factor for anxiety (p = 0.006). Multiparity increased risk for depression (p = 0.001), for anxiety (p = 0.026) and for perinatal stress (p = 0.010). More than 80% of women with depressive symptoms had comorbidities of psychological distress.

CONCLUSIONS

Breech presentation compared to cephalic presentation was not associated with higher levels of psychological distress. However, breech pregnancies are affected by symptoms of potential mental disorder. Multiparous women and younger women may need additional support and would benefit from a standardized screening tool for the assessment of perinatal psychological distress.

CLINICAL TRIAL REGISTRATION

Ethical approval (EA2/241/18) was granted by the Ethics Commission of the Charité University Hospital on the 23.01.2019 (ClinicalTrials.gov Identifier: NCT03827226).

The (After)life of a Trial: Biocommunicability of an At-Risk Pregnancy

The publication of A Randomized Trial of Induction Versus Expectant Management (ARRIVE), conducted in the United States in 2018, heralded a paradigm shift within the obstetrical management of term pregnancy among people who have not previously given birth. ARRIVE finds its home among other canonical - and controversial - randomized controlled trials (RCTs) within obstetrics. We argue that RCTs have their own (after)life, both creating new subjects for biomedical intervention and recalibrating who reproductive health practitioners consider to be at risk of adverse health outcomes. These data have important consequences for medical social scientific engagement with RCTs to further interrogate the questions of risk and intervention within reproductive health.

Optimal time intervals for vaginal breech births: a case-control study

Background

Breech births are associated with a high rate of hypoxic injury, in part due to cord occlusion during emergence. Maximum time intervals and guidelines oriented toward earlier intervention have been proposed in a Physiological Breech Birth Algorithm. We wished to further test and refine the Algorithm for use in a clinical trial.

Methods

We conducted a retrospective case-control study in a London teaching hospital, including 15 cases and 30 controls, during the period of April 2012 to April 2020. Our sample size was powered to test the hypothesis that exceeding recommended time limits is associated with neonatal admission or death. Data collected from intrapartum care records was analysed using SPSS v26 statistical software. Variables were intervals between the stages of labour and various stages of emergence (presenting part, buttocks, pelvis, arms, head). The chi-square test and odds ratios were used to determine association between exposure to the variables of interest and composite outcome. Multiple logistic regression was used to test the predictive value of delays defined as non-adherence the Algorithm.

Results

Logistic regression modelling using the Algorithm time frames had an 86.8% accuracy, a sensitivity of 66.7% and a specificity of 92.3% for predicting the primary outcome. Delays between umbilicus and head >3 minutes (OR: 9.508 [95% CI: 1.390-65.046] p=0.022) and from buttocks on the perineum to head >7 minutes (OR: 6.682 [95% CI: 0.940-41.990] p=0.058) showed the most effect. Lengths of time until the first intervention were consistently longer among the cases. Delay in intervention was more common among cases than head or arm entrapment.

Conclusion

Emergence taking longer than the limits recommended in the Physiological Breech Birth algorithm may be predictive of adverse outcomes. Some of this delay is potentially avoidable. Improved recognition of the boundaries of normality in vaginal breech births may help improve outcomes.

Physiological breech birth training: An evaluation of clinical practice changes after a one-day training program

BACKGROUND

The "physiological breech birth" one-day training program is based on evidence about the physiology of breech births and how clinicians learn breech skills. Previous evaluations have demonstrated positive effects on confidence and knowledge, but the training's effect on clinical practice and outcomes is unknown.

METHODS

A mixed-methods evaluation was conducted in eight National Health Service hospitals in England and Northern Ireland. Changes in confidence and knowledge were assessed using pretraining and post-training surveys. Mode of birth and maternal birth positions were evaluated using audit data covering one year before the training and one year after, for all singleton vaginal breech births at term.

FINDINGS

A total of 263 participants completed the surveys. Confidence in managing breech births in both upright and supine positions significantly increased, as did participant knowledge. Audited data for 1402 women were collected. Overall vaginal birth rates remained similar in both periods. Among singleton vaginal breech births >37 weeks, the use of upright birthing positions increased significantly (P = .002). The study was not powered to detect differences in other outcomes, but pilot data were collected to inform the design of future studies.

CONCLUSIONS

Increase in use of upright birthing positions suggests that physiological breech birth training is likely to lead to clinical practice changes, which may help support maternal choice in line with current guidance. However, provision of a one-day training program did not change overall vaginal breech birth rates. Adequately powered research is needed to determine effects of clinical practice changes on clinical outcomes.

Breech presentation management: A critical review of leading clinical practice guidelines

PROBLEM

Clinical practice guidelines are designed to guide clinicians and consumers of maternity services in clinical decision making, but recommendations are often consensus based and differ greatly between leading organisations.

BACKGROUND

Breech birth is a divisive clinical issue, however vaginal breech births continue to occur despite a globally high caesarean section rate for breech presenting fetuses. Inconsistencies are known to exist between clinical practice guidelines relating to the management of breech presentation.

AIM

The aim of this review was to critically evaluate and compare leading obstetric clinical practice guidelines related to the management of breech presenting fetuses.

METHODS

Leading obstetric guidelines were purposively obtained for review. Analysis was conducted using the International Centre for Allied Health Evidence (iCAHE) Guideline Quality Checklist and reviewing the content of each guideline.

FINDINGS

Antenatal care recommendations and indications for Caesarean Section were relatively consistent between clinical guidelines. However, several inconsistencies were found among the other recommendations in terms of birth mode counselling, intrapartum management and the basis for recommendations.

DISCUSSION

Inconsistencies noted in the clinical practice guidelines have the potential to cause issues related to valid consent and create confusion among clinicians and maternity consumers.

CONCLUSION

Clinical practice guidelines, which focus on the risks of a Vaginal Breech Birth without also discussing the risks of a Caesarean Section when a breech presentation is diagnosed, has the potential to sway clinician attitudes and impact birth mode decision-making in maternity consumers. To respect pregnant women's autonomy and fulfil the legal requirements of consent, clinicians should provide balanced counselling.

Risk factors for adverse outcomes in vaginal preterm breech labor

PURPOSE

To assess the risk factors for adverse outcomes in attempted vaginal preterm breech deliveries.

METHODS

A retrospective case-control study, including 2312 preterm breech deliveries (24 + 0 to 36 + 6 gestational weeks) from 2004 to 2018 in Finland. The preterm breech fetuses with adverse outcomes born vaginally or by emergency cesarean section were compared with the fetuses without adverse outcomes with the same gestational age. A multivariable logistic regression analysis was used to calculate the risk factors for adverse outcomes (umbilical arterial pH below 7, 5-min Apgar score below 4, intrapartum stillbirth and neonatal death < 28 days of age).

RESULTS

Adverse outcome in vaginal preterm breech delivery was associated with maternal obesity (aOR 32.19, CI 2.97-348.65), smoking (aOR 2.29, CI 1.12-4.72), congenital anomalies (aOR 4.50, 1.56-12.96), preterm premature rupture of membranes (aOR 1.87, CI 1.00-3.49), oligohydramnios (28-32 weeks of gestation: aOR 6.50, CI 2.00-21.11, 33-36 weeks of gestation: aOR 19.06, CI 7.15-50.85), epidural anesthesia in vaginal birth (aOR 2.44, CI 1.19-5.01), and fetal growth below the second standard deviation (28-32 weeks of gestation: aOR 5.89, CI 1.00-34.74, 33-36 weeks of gestation: aOR 12.27, CI 2.81-53.66).

CONCLUSION

The study shows that for each subcategory of preterm birth, there are different risk factors for adverse neonatal outcomes in planned vaginal breech delivery. Due to the extraordinary increased risk of adverse outcomes, we would recommend a planned cesarean section in very preterm breech presentation (28 + 0 to 32 + 6 weeks) with severe maternal obesity, oligohydramnios, or fetal growth restriction and in moderate to late preterm breech presentation (33 + 0 to 36 + 6 weeks) with oligohydramnios or fetal growth restriction.

Impact of implementation of a breech clinic in a tertiary hospital

BACKGROUND

The incidence of breech presentation in single pregnancies at term is between three to 5 %. In order to support eligible women in their choice of mode of delivery, a dedicated breech clinic with a care pathway was developed in December 2015 in a tertiary referral centre in Brussels. The primary objective of this study was to evaluate the vaginal birth rate before and after the introduction of a dedicated breech clinic. The secondary objective was to compare the early neonatal outcomes before and after the breech clinic was introduced.

METHODS

This was a single centre retrospective and prospective study. The inclusion criteria were term (from 37 weeks), singleton fetus and breech presentation at delivery. The exclusion criteria were suspected intrauterine growth restriction, severe fetal malformations and intrauterine fetal demise. We used a composite outcome as an indicator of neonatal morbidity and mortality.

RESULTS

After the introduction of the breech clinic, we observed a significant increase in planned vaginal delivery from 7.4% (12/162) to 53.0% (61/115) (OR: 13.5; 95% CI: 6.7-27.0). The effective vaginal breech delivery rate (planned and unexpected) significantly increased from 4.3% (7/162) pre-implementation of breech clinic to 43.5% (50/115) post-implementation (OR: 17.0; 95% CI: 7.3-39.6). Neonatal outcomes were not statistically different between the before and after periods.

CONCLUSION

The introduction of a dedicated breech clinic has led to an increase in vaginal deliveries for breech babies without adversely affecting neonatal outcomes.

Face-to-pubes rotational maneuver for bilateral nuchal arms in a vaginal breech birth, resolved in an upright maternal position: A case report

BACKGROUND

A physiological breech birth is one in which the woman is encouraged to remain active throughout her labor and able to assume the position of her choice for the birth. Use of this strategy within the United Kingdom National Health Service has led to the use of innovative maneuvers to relieve obstruction when women give birth in upright positions, for example, kneeling or standing. This includes use of the face-to-pubes rotational maneuver to relieve extended nuchal arm(s). In this paper, we report a case where the face-to-pubes rotational maneuver was used to relieve bilateral nuchal arm entrapment in a breech birth.

METHODS

Single-case study. We aimed to generate an in-depth understanding of how this maneuver works and how professionals decide to use it by exploring its use in a real-life context.

RESULTS

The face-to-pubes rotational maneuver appears to be an effective method of relieving nuchal arm entrapment when used by experienced hands. In cases of bilateral nuchal arm entrapment, elevation to a higher station may be necessary to dis-impact the arms above the pelvic inlet before the fetus can be rotated. After face-to-pubes rotation and release of arms, the head should be realigned in an occiput anterior position for delivery.

CONCLUSION

The face-to-pubes rotational maneuver can be taught for resolution of nuchal arms in an upright position. Parents should be informed of the availability or not of a specialist midwife trained in physiological breech birth, as this may be important to their decision-making.

Revisiting the management of term breech presentation: a proposal for overcoming some of the controversies

Background

The debate surrounding the management of term breech presentation has excessively focused on the mode of delivery. Indeed, a steady decline in the rate of vaginal breech delivery has been observed over the last three decades, and the soundness of the vaginal route was seriously challenged at the beginning of the 2000s. However, associations between adverse perinatal outcomes and antenatal risk factors have been observed in foetuses that remain in the breech presentation in late gestation, confirming older data and raising the question of the role of these antenatal risk factors in adverse perinatal outcomes. Thus, aspects beyond the mode of delivery must be considered regarding the awareness and adequate management of such situations in term breech pregnancies.

Main body

In the context of the most recent meta-analysis and with the publication of large-scale epidemiologic studies from medical birth registries in countries that have not abruptly altered their criteria for individual decision-making regarding the breech delivery mode, the currently available data provide essential clues to understanding the underlying maternal-foetal conditions beyond the delivery mode that play a role in perinatal outcomes, such as foetal growth restriction and gestational diabetes mellitus. In view of such data, an accurate evaluation of these underlying conditions is necessary in cases of persistent term breech presentation. Timely breech detection, estimated foetal weight/growth curves and foetal/maternal well-being should be considered along with these possible antenatal risk factors; a thorough analysis of foetal presentation and an evaluation of the possible benefit of external cephalic version and pelvic adequacy in each specific situation of persistent breech presentation should be performed.

Conclusion

The adequate management of term breech pregnancies requires screening and the efficient identification of breech presentation at 36 weeks of gestation, followed by thorough evaluations of foetal weight, growth and mobility, while obstetric history, antenatal gestational disorders and pelvis size/conformation are considered. The management plan, including external cephalic version and follow-up based on the maternal/foetal condition and potentially associated disorders, should be organized on a case-by-case basis by a skilled team after the woman is informed and helped to make a reasoned decision regarding delivery route.

[Breech Presentation: CNGOF Guidelines for Clinical Practice - Benefits and Risks for the Neonate and Child of Planned Vaginal Delivery versus Elective Cesarean Section]

OBJECTIVE

To provide guidelines regarding the benefits and risks for the neonate and the child of planning vaginal delivery versus planning elective cesarean section in case of term breech presentation.

METHODS

MedLine and Cochrane Library databases search and review of the main foreign guidelines.

RESULTS

In case of term breech presentation, planned vaginal delivery might be associated with an increased composite risk of perinatal mortality or occurrence of a combined outcome of serious neonatal morbidity in comparison to elective cesarean section (LE2). In case of planned vaginal delivery of term breech presentation, the risk of perinatal mortality is around 1‰ (LE3). It is potentially less but still exists in case of elective cesarean section (LE2). Risks of neonatal trauma - especially fracture of clavicle and breech hematoma -, Apgar score lower than 7 at 5minutes, and need for neonatal intubation and ventilation, are increased in case of planned vaginal delivery (LE2) and are around 1% (LE3). However, no difference has been demonstrated between planned vaginal and planned cesarean delivery regarding neurodevelopmental outcomes at 2 years (LE2), cognitive and psychomotor outcomes between 5 and 8 years (LE3), and adult intellectual performances (LE4).

CONCLUSIONS

In case of term breech presentation, risks of severe complications for neonate and child are low in case of planned vaginal delivery or elective cesarean section. Short-term benefit/risk balance for the neonate might favor elective cesarean section but long-term morbidity seems to be similar whatever the delivery route (Professional consensus).

[Breech Presentation: CNGOF Guidelines for Clinical Practice - Epidemiology, Risk Factors and Complications]

OBJECTIVES

To study the frequency, the risk factors and the mode of delivery of breech presentation. To analyze the perinatal morbidity and mortality associated with breech presentation in comparison to cephalic presentation from all mode of delivery.

METHODS

MedLine and Cochrane Library databases search in French and English and review of the main foreign guidelines between 1980 and 2019.

RESULTS

Three modes of breech presentation exist according to fetal lower limbs position: frank in 2/3 of cases, complete in 1/3 of cases or, more rarely, incomplete (LE3). About 5% of women gave birth in breech presentation in France (LE3). As the frequency of breech presentation decreases with increasing gestational age, this incidence is lower after 37 WG and represents only 3% of term deliveries (LE3). Congenital uterine malformation (LE3) and fibroma (LE3), prematurity (LE3), oligoamnios (LE3), some fetal congenital malformations (LE3) and low birthweight for gestational age (LE3) are the main risk factors with breech presentation. In France, one-third of women with a term fetus in breech presentation attempt a vaginal delivery (LE3), which is successful in 70% of cases (LE3). Neonatal outcome is not associated with type of breech presentation (frank or complete) in case of vaginal delivery attempt after 37 WG (LE3). Overall, perinatal morbidity and mortality after 37 WG of breech presentation appear to be greater than in cephalic presentation from all mode of delivery (LE3). The risk of traumatic injury in breech delivery is estimated under 1% (LE3). The most common injuries are collarbone fractures, hematomas or contusions, and brachial plexus injury (LE3). Breech presentation is associated with an increased risk of hip dysplasia (LE3) and cesarean delivery does not seem to be a protective factor (LE3). Breech presentation does not appear to be associated with an increased risk of cerebral palsy compared to cephalic presentation after exclusion of fetuses with congenital malformations (LE3).

CONCLUSION

Worldwide, mode of delivery of breech presentation has undergone profound changes since the publication of the TBT (Term Breech Trial). There are intrinsic factors associated with breech presentation, which should not be overlooked when interpreting the increased perinatal morbidity and mortality observed in case of breech presentation.

[Breech Presentation: CNGOF Guidelines for Clinical Practice - Labour and Induction]

OBJECTIVES

To issue guidelines on management of labour induction and breech vaginal delivery.

MATERIALS AND METHODS

Bibliographic search restricted to French and English languages using Medline database®, Cochrane Library and international guidelines of medical societies.

RESULTS

Breech delivery must take place in a maternity ward, in the presence of an obstetrician and gynaecologist and with the immediate availability of an anesthesiologist and a pediatrician during active second stage (Professional consensus). Term breech is not a contraindication to labour induction when the criteria for acceptance of vaginal delivery are met (Grade C). In this case, oxytocin or prostaglandins can be used (Grade C). Epidural analgesia with low concentrations of local anesthetics should be encouraged in case of vaginal delivery attempt (Professional consensus). It is recommended to use continuous monitoring of the CTG (Professional consensus). The use of second-line fetal monitoring is not recommended (Professional consensus). The administration of oxytocin is possible for labour augmentation (Professional consensus). It is better to start the expulsive efforts when the presentation is engaged as low as possible in the pelvic excavation (Professional consensus). Breech presentation is not an indication of episiotomy (Professional consensus). Due to insufficient data, it was not possible to make recommendations on specificities of preterm breech delivery.

CONCLUSION

In case of planned vaginal delivery, labour induction is possible for term breech fetuses, even with unfarable cervix. Guidelines for labour and vaginal delivery management have a low level of evidence.

[Breech Presentation: CNGOF Guidelines for Clinical Practice - Case Selection for Trial of Labour]

OBJECTIVE

The objective of this chapter is to examine on the basis of the knowledge currently available the criteria available before labour for selecting women who would be eligible for trial of vaginal delivery.

METHODOLOGY

Bibliographical research in French and English using the Medline and Cochrane databases between 1980 and 2019 and the recommendations of international societies.

RESULTS

It is recommended to offer women who wish to attempt a vaginal delivery at term a pelvimetry to decide with them on their mode of delivery (Grade C). The pelvimetric standards used at the time of the PREMODA study were anteroposterior diameter of inlet≥105mm, a transverse diameter of inlet≥120mm, a transverse interspinous diameter≥100mm. However, since there is no evidence about which pelvic measures to use, nor any evidence to set decision-making thresholds other than those set in published studies, the selected decision-making thresholds can be adjusted according to gestational age at delivery or fetal biometrics (Professional consensus). There is no argument for recommending the practice of pelvimetry in the case of delivery before 37 weeks gestational age (Professional consensus) and in the case of breech presentation discovered at the time of beginning of labour, the absence of pelvimetry alone does not contraindicate the attempt of vaginal delivery (Professional consensus). There is insufficient data to recommend the systematic use of fetal weight estimation and/or biparietal diameter measurement as acceptance criteria for a vaginal delivery attempt. In the event of a known fetal weight estimation before birth greater than 3800g, a cesarean section is to be preferred (Professional consensus). The breech presentation is not in itself a contraindication to an attempt of vaginal delivery for a small fetus for gestational age (Professional consensus). The presentation of the non-frank breech is not in itself a contraindication to an attempt of vaginal delivery (Professional consensus). In the case of premature breech delivery, current data do not allow to recommend one delivery route over another (Professional consensus). It is recommended to check the absence of hyperextension of the fetal head by ultrasound before an attempt of vaginal delivery (Professional consensus) and to prefer a cesarean section if such a position is found (Professional consensus). It is not recommended to propose a caesarean section with the sole reason of nulliparity (Grade C). The history of cesarean section is not in itself a contraindication to an attempt of vaginal delivery in the case of fetal breech presentation (Professional consensus). Premature rupture of the membranes is not in itself a contraindication to an attempt of vaginal delivery (Professional consensus).

CONCLUSION

A number of the factors analyzed in this chapter are to be incorporated into the decision-making process in order to choose with the woman whose fetus is in breech presentation the delivery route.

Adherence to guidelines and suboptimal practice in term breech delivery with perinatal death- a population-based case-control study in Norway

BACKGROUND

In a recent population-based study we reported excess risk of neonatal mortality associated with vaginal breech delivery. In this case-control study we examine whether deviations from Norwegian guidelines are more common in breech deliveries resulting in intrapartum or neonatal deaths than in breech deliveries where the offspring survives, and if these deaths are potentially avoidable.

MATERIAL AND METHODS

Case-control study completed as a perinatal audit including term breech deliveries of singleton without congenital anomalies in Norway from 1999 to 2015. Deliveries where the child died intrapartum or in the neonatal period were case deliveries. For each case, two control deliveries who survived were identified. All the included deliveries were reviewed by four obstetricians independently assessing if the deaths in the case group might have been avoided and if the management of the deviations from Norwegian guidelines were more common in case than in control deliveries.

RESULTS

Thirty-one case and 62 control deliveries were identified by the Medical Birth Registry of Norway. After exclusion of non-eligible deliveries, 22 case and 31 control deliveries were studied. Three case and two control deliveries were unplanned home deliveries, while all in-hospital deliveries were in line with national guidelines. Antenatal care and/or management of in-hospital deliveries was assessed as suboptimal in seven (37%) case and two (7%) control deliveries (p = 0.020). Three case deliveries were completed as planned caesarean delivery and 12 (75%) of the remaining 16 deaths were considered potentially avoidable had planned caesarean delivery been done. In seven of these 16 deliveries, death was associated with cord prolapse or difficult delivery of the head.

CONCLUSION

All in-hospital breech deliveries were in line with Norwegian guidelines. Seven of twelve potentially avoidable deaths were associated with birth complications related to breech presentation. However, suboptimal care was more common in case than control deliveries. Further improvement of intrapartum care may be obtained through continuous rigorous training and feedback from repeated perinatal audits.

Comparison of maternal and perinatal morbidity between elective and emergency caesarean section in singleton-term breech presentation

The objective of the study was to compare maternal and neonatal adverse outcomes between elective caesarean section (ElCS) and emergency caesarean section (EmCS) for singleton-term breech presentation. This study included women with singleton breech presentation who underwent ElCS or EmCS at term during 2007-2015 at Siriraj Hospital (Thailand). Complete data were collected for 2178 pregnant women. Of those, 1322 (60.7%) women underwent EmCS, and 856 (39.3%) delivered by ElCS. Maternal and perinatal morbidity were compared. There was no maternal or perinatal death in either group. Maternal morbidity was comparable between groups, except for longer hospital stay in the EmCS group (p = .047). One-minute Apgar score was significantly lower in the EmCS group (p = .040). There was no significant difference in 5-min Apgar score between groups. No significant difference was observed for serious maternal and neonatal morbidity between women who underwent ElCS versus those who underwent EmCS for singleton-term breech presentation.IMPACT STATEMENTWhat is already known on this subject? Emergency caesarean section (EmCS) is generally known to be associated with a higher risk of maternal and neonatal complications than elective caesarean section (ElCS).What do the results of this study add? In singleton-term breech presentation, EmCS in tertiary care setting was not associated with an increase in serious maternal and neonatal morbidity compared with EICS. Cord prolapse as an indication for emergency caesarean section was significantly associated with adverse outcomes while advanced cervical dilation ≥7 cm or low foetal station ≥+1 did not have an impact on maternal and neonatal complications.What are the implications of these findings for clinical practice and/or further research? Mean gestational age in both the ElCS and EmCS groups was approximately 38 weeks and 5 d; there were no neonatal cases with respiratory distress syndrome. Our findings suggest further prospective study in planned caesarean section scheduled for 38-39 weeks in patients with term breech presentation. The results of such a study could yield lower rates of both EmCS and potential adverse outcomes.

Breech birth at home: outcomes of 60 breech and 109 cephalic planned home and birth center births

Background

Research on outcomes of out-of-hospital breech birth is scarce. This study evaluates the outcomes of singleton term breech and cephalic births in a home or birth center setting.

Methods

This is a retrospective observational cohort study of 60 breech and 109 cephalic planned out-of-hospital term singleton births during a 6 year period with a single obstetrician. Outcomes measured included mode of delivery; birth weights; 1 & 5-min Apgar scores; ante-, intra-, and post-partum transports; perineal integrity; and other maternal and neonatal morbidity.

Results

50 breech and 102 cephalic presentations were still in the obstetrician’s care at the onset of labor; of those, 10 breech and 11 cephalic mothers required transport during labor. 76% of breech and 92.2% of cephalic births were planned to occur at home, with the remainder at a freestanding birth center. When compared to the cephalic group, the breech group had a higher rate of antepartum and in-labor transfer of care and cesarean section. Among completed out-of-hospital births, the breech group had a significantly higher rate of 1-min Apgar scores < 7 but no significant difference at 5 min. Rates of vaginal birth for both groups were high, with 84% of breech and 97.1% of cephalic mothers giving birth vaginally in this series. Compared to primiparas, multiparas in both groups had less perineal trauma and higher rates of out-of-hospital birth, vaginal birth, and spontaneous vaginal birth. No breech infant or mother required postpartum hospital transport, while one cephalic infant and one cephalic mother required postpartum transport. Of the babies born out-of-hospital, there was one short-term and one longer-term birth injury among the breech group and one short-term brachial plexus injury in the cephalic group.

Conclusions

A home or birth center setting leads to high rates of vaginal birth and good maternal outcomes for both breech and cephalic term singleton presentations. Out-of-hospital vaginal breech birth under specific protocol guidelines and with a skilled provider may be a reasonable choice for women wishing to avoid a cesarean section—especially when there is no option of a hospital breech birth. However, this study is underpowered to calculate uncommon adverse neonatal outcomes.

Sonographic prediction of small and large for gestational age in breech-presenting fetuses

Introduction:

To evaluate various sonographic estimated fetal weight (sEFW) formulas’ accuracy for small- and large-for-gestational age (SGA/LGA) prediction in breech-presenting fetuses.

Materials and methods:

A retrospective analysis of all ultrasound-based fetal biometrical measurements performed within 3 days of delivery in term pregnancies, in one medical center (2007–2014). Overall, 274 breech-presenting fetuses (study group) were compared to 274 vertex-presenting fetuses (control group) matched by gender, gestational age and birth weight. sEFW was calculated by six previously published formulas. Accuracy was compared utilizing systematic error and random error for every formula. Prediction precision of SGA and LGA was evaluated by calculating each formula’s sensitivity, specificity, +/− predictive value, and the area under the receiver-operating characteristic (ROC) curve (AUC).

Results:

Systematic error and random error varied greatly between formulas, ranging from −7.4% to 3.1%, 7.3% to 8.3% for the vertex-presenting fetuses and −8.9% to 1.9%, 7.9% to 8.6% for the breech-presenting fetuses, respectively. There was no statistical difference in small- or large-for-gestational age prediction parameters between the groups. The highest sensitivity and specificity for prediction was achieved by same formula regardless of presentation.

Conclusion:

In our cohort, overall accuracy was slightly superior among vertex-presenting fetuses without difference in prediction accuracy for small- and large-for-gestational age neonates.

Expertise in physiological breech birth: A mixed-methods study

BACKGROUND

The safety of vaginal breech birth depends on the expertise of birth attendants, yet the meaning of "expertise" remains unclear and subjectively defined. The objective of this study was to define expertise and the roles experts may play in expanding access to this service.

METHODS

We performed an integrative analysis of two strands of data concerning expertise in physiological breech birth, including the following: survey data from a Delphi study involving 26 very experienced clinicians (mean experience = 135 breech births) and 2 service user representatives, and interviews from a grounded theory study of 14 clinicians more moderately experienced with physiological methods (5-30 upright breech births). Data were pooled and analyzed using constant comparative methods.

RESULTS

Expertise is defined by its ongoing function, the generation of comparatively good outcomes, and confidence and competence among colleagues. Although clinical experience is important, expertise is developed and expressed in social clinical roles, which expand as experience grows: clinician, mentor, specialist, and expert. To develop expertise within a service, clinicians who have an interest in breech birth should be supported to perform these roles within specialist teams.

CONCLUSIONS

Specialist breech teams may facilitate the development of expertise within maternity care settings. Evaluation of expertise based on enablement of women and colleagues, as well as outcomes, will potentially avoid the pitfalls of alienation produced by some forms of specialist authority.

Deliberate acquisition of competence in physiological breech birth: A grounded theory study

PROBLEM

Research suggests that the skill and experience of the attendant significantly affect the outcomes of vaginal breech births, yet practitioner experience levels are minimal within many contemporary maternity care systems.

BACKGROUND

Due to minimal experience and cultural resistance, few practitioners offer vaginal breech birth, and many practice guidelines and training programmes recommend delivery techniques requiring supine maternal position. Fewer practitioners have skills to support physiological breech birth, involving active maternal movement and choice of birthing position, including upright postures such as kneeling, standing, squatting, or on a birth stool. How professionals learn complex skills contrary to those taught in their local practice settings is unclear.

QUESTION

How do professionals develop competence and expertise in physiological breech birth?

METHODS

Nine midwives and five obstetricians with experience facilitating upright physiological breech births participated in semi-structured interviews. Data were analysed iteratively using constructivist grounded theory methods to develop an empirical theory of physiological breech skill acquisition.

RESULTS

Among the participants in this research, the deliberate acquisition of competence in physiological breech birth included stages of affinity with physiological birth, critical awareness, intention, identity and responsibility. Expert practitioners operating across local and national boundaries guided less experienced practitioners.

DISCUSSION

The results depict a specialist learning model which could be formalised in sympathetic training programmes, and evaluated. It may also be relevant to developing competence in other specialist/expert roles and innovative practices.

CONCLUSION

Deliberate development of local communities of practice may support professionals to acquire elusive breech skills in a sustainable way.

Risk factors associated with adverse perinatal outcome in planned vaginal breech labors at term: a retrospective population-based case-control study

BACKGROUND

Vaginal breech delivery is associated with adverse perinatal outcome. The aim of this study was to identify factors associated with adverse perinatal outcome in term breech pregnancies, and to provide clinicians an aid in selecting women for a trial of vaginal labor with the fetus in breech position.

METHODS

We conducted a retrospective, nationwide, Finnish population-based case-control study. All planned singleton vaginal deliveries at term with the fetus in breech position between the years 2005 and 2014 were analyzed. The study's end point was a composite set of adverse perinatal outcomes. All infants with an adverse outcome were compared to the infants with normal outcomes. A multivariate logistic regression model was used to analyze the data.

RESULTS

An adverse perinatal outcome was recorded for 73 (1.5%) infants. According to the study results fetal growth restriction (adjusted odds ratio, 2.94; 95% CI, 1.30-6.67), oligohydramnios (adjusted odds ratio, 2.94; 95% CI, 1.15-7.18), a history of cesarean section (adjusted odds ratio, 2.94; 95% CI, 1.28-6.77, gestational diabetes (adjusted odds ratio, 2.89; 95% CI, 1.54-5.40), epidural anesthesia (adjusted odds ratio, 2.20; 95% CI, 1.29-3.75) and nulliparity (adjusted odds ratio, 1.84; 95% CI, 1.10-3.08) were associated with adverse perinatal outcome.

CONCLUSIONS

Adverse perinatal outcome in planned vaginal breech labor at term is associated with fetal growth restriction, oligohydramnios, previous cesarean delivery, gestational diabetes, nulliparity and epidural anesthesia.

Cardiotocography in breech versus vertex delivery: an examiner-blinded, cross-sectional nested case-control study

BACKGROUND

The safety of vaginal breech delivery has been debated for decades. Although it has been shown to predispose infants to immediate depression, several observational studies have also shown that attempting vaginal breech delivery does not increase perinatal morbidity or low Apgar score at the age of five minutes. Cardiotocography monitoring is recommended during vaginal breech delivery, but comparative data describing differences between cardiotocography tracings in breech and vertex deliveries is scarce. This study aims to evaluate differences in intrapartum cardiotocography tracings between breech and vertex deliveries in the final 60 min of delivery. A secondary goal is to identify risk factors for suboptimal neonatal outcome in the study population.

METHODS

One hundred eight breech and 108 vertex singleton, intended vaginal deliveries at term from a tertiary hospital with 5000 annual deliveries were included. Two experienced obstetricians, blinded to fetal presentation, neonatal outcome and actual mode of delivery, evaluated traces recorded 60 min before delivery. They provided a three-tier classification and evaluated different trace features according to FIGO (1987) guidelines. Factors associated with acidemia and low Apgar scores were identified by univariate and multivariable analyses performed with binary logistic regression. Student's T-test and chi-square test were used, as appropriate.

RESULTS

Late decelerations were seen in 13.9 % of breech and 2.8 % of vertex deliveries (p = 0.003) and decreased variability in 26.9 % of breech and 8.3 % of vertex deliveries (p < 0.001). In multivariable analysis complicated variable decelerations and breech presentation were identified as risk factors for neonatal acidemia and low Apgar score at the age of five minutes. Pathological trace and breech presentation were independent risk factors for low Apgar score at the age of one minute.

CONCLUSIONS

Decreased variability and late decelerations were more prevalent in breech compared to vertex deliveries. Pathological trace predicts immediate neonatal depression and especially complicated variable decelerations may signal more severe distress. Further research is needed to create guidelines for safe management of vaginal breech delivery.

Risk factors for emergency caesarean section in planned vaginal breech delivery

PURPOSE

To identify risk factors for emergency caesarean section in women attempting a vaginal breech delivery at term.

METHODS

Data from 1092 breech deliveries performed between 1998 and 2013 at a Swiss cantonal hospital were extracted from an electronic database. Of the 866 women with a singleton, full term pregnancy, 464 planned a vaginal breech delivery. Fifty-seven percent (265/464) were successful in delivering vaginally. Multivariate regression analyses of risk factors were performed, and neonatal and maternal complications were compared.

RESULTS

Risk factors for failed vaginal delivery were peridural anaesthesia (OR 2.05; 95 % CI 1.09-3.84; p = 0.025), nulliparity (OR 2.82; 95 % CI 1.87-4.25; p < 0.001), high birth weight (OR 1.17; 95 % CI 1.04-1.30; p = 0.006) and induction of labour (OR 1.56; 95 % CI 1.003-2.44; p = 0.048). Maternal age, height and weight; gestational age; or newborn length and head circumference were not associated with an unplanned caesarean section. The rate of successful vaginal delivery in the low risk sub-group (multiparous women without induction of labour) was 58-83 %, depending on birth weight category. The likelihood of success for the high risk sub-group (nulliparous women with induction of labour) fell below a third at neonatal birth weights >3250 g. Complication rates were low in the cohort.

CONCLUSIONS

Use of peridural anaesthesia, nulliparity, high birth weight and induction of labour were risk factors for unsuccessful vaginal breech delivery requiring an unplanned caesarean section. Awareness of these risk factors is useful when counselling women who are considering a vaginal breech delivery.

Planned caesarean section for term breech delivery

BACKGROUND

Poor outcomes after breech birth might be the result of underlying conditions causing breech presentation or due to factors associated with the delivery.

OBJECTIVES

To assess the effects of planned caesarean section for singleton breech presentation at term on measures of pregnancy outcome.

SEARCH METHODS

We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (31 March 2015).

SELECTION CRITERIA

Randomised trials comparing planned caesarean section for singleton breech presentation at term with planned vaginal birth.

DATA COLLECTION AND ANALYSIS

Two review authors independently assessed trials for inclusion and risk of bias, extracted data and checked them for accuracy.

MAIN RESULTS

Three trials (2396 participants) were included in the review. Caesarean delivery occurred in 550/1227 (45%) of those women allocated to a vaginal delivery protocol and 1060/1169 (91%) of those women allocated to planned caesarean section (average risk ratio (RR) random-effects, 1.88, 95% confidence interval (CI) 1.60 to 2.20; three studies, 2396 women, evidence graded low quality). Perinatal or neonatal death (excluding fatal anomalies) or severe neonatal morbidity was reduced with a policy of planned caesarean section in settings with a low national perinatal mortality rate (RR 0.07, 95% CI 0.02 to 0.29, one study, 1025 women, evidence graded moderate quality), but not in settings with a high national perinatal mortality rate (RR 0.66, 95% CI 0.35 to 1.24, one study, 1053 women, evidence graded low quality). The difference between subgroups was significant (Test for subgroup differences: Chi² = 8.01, df = 1 (P = 0.005), I² = 87.5%). Due to this significant heterogeneity, a random-effects analysis was performed. The average overall effect was not statistically significant (RR 0.23, 95% CI 0.02 to 2.44, one study, 2078 infants). Perinatal or neonatal death (excluding fatal anomalies) was reduced with planned caesarean section (RR 0.29, 95% CI 0.10 to 0.86, three studies, 2388 women). The proportional reductions were similar for countries with low and high national perinatal mortality rates.The numbers studied were too small to satisfactorily address reductions in birth trauma and brachial plexus injury with planned caesarean section. Neither of these outcomes reached statistical significance (birth trauma: RR 0.42, 95% CI 0.16 to 1.10, one study, 2062 infants (20 events),evidence graded low quality; brachial plexus injury: RR 0.35, 95% CI 0.08 to 1.47, three studies, 2375 infants (nine events)).Planned caesarean section was associated with modestly increased short-term maternal morbidity (RR 1.29, 95% CI 1.03 to 1.61, three studies, 2396 women,low quality evidence). At three months after delivery, women allocated to the planned caesarean section group reported less urinary incontinence (RR 0.62, 95% CI 0.41 to 0.93, one study, 1595 women); no difference in 'any pain' (RR 1.09, 95% CI 0.93 to 1.29, one study, 1593 women,low quality evidence); more abdominal pain (RR 1.89, 95% CI 1.29 to 2.79, one study, 1593 women); and less perineal pain (RR 0.32, 95% CI 0.18 to 0.58, one study, 1593 women).At two years, there were no differences in the combined outcome 'death or neurodevelopmental delay' (RR 1.09, 95% CI 0.52 to 2.30, one study, 920 children,evidence graded low quality); more infants who had been allocated to planned caesarean delivery had medical problems at two years (RR 1.41, 95% CI 1.05 to 1.89, one study, 843 children). Maternal outcomes at two years were also similar. In countries with low perinatal mortality rates, the protocol of planned caesarean section was associated with lower healthcare costs, expressed in 2002 Canadian dollars (mean difference -$877.00, 95% CI -894.89 to -859.11, one study, 1027 women).All of the trials included in this review had design limitations, and the GRADE level of evidence was mostly low. No studies attempted to blind the intervention, and the process of random allocation was suboptimal in two studies. Two of the three trials had serious design limitations, however these studies contributed to fewer outcomes than the large multi-centre trial with lower risk of bias.

AUTHORS' CONCLUSIONS

Planned caesarean section compared with planned vaginal birth reduced perinatal or neonatal death as well as the composite outcome death or serious neonatal morbidity, at the expense of somewhat increased maternal morbidity. In a subset with 2-year follow up, infant medical problems were increased following planned caesarean section and no difference in long-term neurodevelopmental delay or the outcome "death or neurodevelopmental delay" was found, though the numbers were too small to exclude the possibility of an important difference in either direction.The benefits need to be weighed against factors such as the mother's preference for vaginal birth and risks such as future pregnancy complications in the woman's specific healthcare setting. The option of external cephalic version is dealt with in separate reviews. The data from this review cannot be generalised to settings where caesarean section is not readily available, or to methods of breech delivery that differ materially from the clinical delivery protocols used in the trials reviewed. The review will help to inform individualised decision-making regarding breech delivery. Research on strategies to improve the safety of breech delivery and to further investigate the possible association of caesarean section with infant medical problems is needed.

The Impact of an ECV Service is Limited by Antenatal Breech Detection: A Retrospective Cohort Study

BACKGROUND

External cephalic version (ECV) reduces the chance of breech presentation at term birth and lowers the chance of a cesarean delivery. ECV services are now in place in many units in the United Kingdom but their effectiveness is unknown. The aim of this study was to investigate the reasons for breech presentation at term birth.

METHODS

We performed a retrospective cohort study of 394 consecutive babies who were in breech presentation at term birth in a large United Kingdom maternity unit that offers ECV. The cohort was analyzed over two time periods 10 years apart: 1998-1999 and 2008-2009.

RESULTS

Only 33.8 percent of women had undergone a (failed) ECV attempt. This low proportion was mainly because breech presentation was not diagnosed antenatally (27.9%). Other contributing factors were: ECV not offered by clinicians (12.2%), ECV declined by women (14%), and contraindications to ECV (10.7%). Over the 10-year period, the proportion of breech presentations that were not diagnosed antenatally increased from 23.2 to 32.5 percent (p = 0.04), which constituted 52.8 percent of women who had not undergone an ECV attempt in 2008-2009. Failure of clinicians to offer ECV reduced from 21.6 to 3.0 percent (p = 0.0001) and the proportion of women declining ECV decreased from 19.1 to 9.0 percent (p = 0.005). Overall, ECV attempts increased from 28.9 to 38.5 percent (p = 0.05).

CONCLUSIONS

Although ECV counseling, referral, and attempt rates have increased, failure to detect breech presentation antenatally is the principal barrier to successful ECV. Improved breech detection would have a greater impact than methods to increase ECV success rates.

A randomized trial of planned cesarean or vaginal delivery for twin pregnancy

BACKGROUND

Twin birth is associated with a higher risk of adverse perinatal outcomes than singleton birth. It is unclear whether planned cesarean section results in a lower risk of adverse outcomes than planned vaginal delivery in twin pregnancy.

METHODS

We randomly assigned women between 32 weeks 0 days and 38 weeks 6 days of gestation with twin pregnancy and with the first twin in the cephalic presentation to planned cesarean section or planned vaginal delivery with cesarean only if indicated. Elective delivery was planned between 37 weeks 5 days and 38 weeks 6 days of gestation. The primary outcome was a composite of fetal or neonatal death or serious neonatal morbidity, with the fetus or infant as the unit of analysis for the statistical comparison.

RESULTS

A total of 1398 women (2795 fetuses) were randomly assigned to planned cesarean delivery and 1406 women (2812 fetuses) to planned vaginal delivery. The rate of cesarean delivery was 90.7% in the planned-cesarean-delivery group and 43.8% in the planned-vaginal-delivery group. Women in the planned-cesarean-delivery group delivered earlier than did those in the planned-vaginal-delivery group (mean number of days from randomization to delivery, 12.4 vs. 13.3; P=0.04). There was no significant difference in the composite primary outcome between the planned-cesarean-delivery group and the planned-vaginal-delivery group (2.2% and 1.9%, respectively; odds ratio with planned cesarean delivery, 1.16; 95% confidence interval, 0.77 to 1.74; P=0.49).

CONCLUSIONS

In twin pregnancy between 32 weeks 0 days and 38 weeks 6 days of gestation, with the first twin in the cephalic presentation, planned cesarean delivery did not significantly decrease or increase the risk of fetal or neonatal death or serious neonatal morbidity, as compared with planned vaginal delivery. (Funded by the Canadian Institutes of Health Research; ClinicalTrials.gov number, NCT00187369; Current Controlled Trials number, ISRCTN74420086.).