Vaginal Breech Birth Research Articles

The Optimal Prediction Model for Successful External Cephalic Version.

The majority of breech fetuses are delivered by cesarean birth as few physicians are trained in vaginal breech birth. An external cephalic version (ECV) can prevent cesarean delivery and the associated morbidity in these patients. Current guidelines recommend that all patients with breech presentation be offered an ECV attempt. Not all attempts are successful, and an attempt does carry some risks, so shared decision-making is necessary. To aid in patient counseling, over a dozen prediction models to predict ECV success have been proposed in the last few years. However, very few models have been externally validated, and thus, none have been adopted into clinical practice. This study aims to use data from a U.S. hospital to provide further data on ECV prediction models. This study retrospectively gathered data from Carle Foundation Hospital and used it to test six models previously proposed to predict ECV success. These models were Dahl 2021, Bilgory 2023, López Pérez 2020, Kok 2011, Burgos 2010, and Tasnim 2012 (GNK-PIMS score). A total of 125 patients undergoing 132 ECV attempts were included. A total of 69 attempts were successful (52.2%). Dahl 2021 had the greatest predictive value (area under the curve [AUC]: 0.779), whereas Tasnim 2012 performed the worst (AUC: 0.626). The remaining models had similar predictive values as each other (AUC: 0.68-0.71). Bootstrapping confirmed that all models except Tasnim 2012 had confidence intervals not including 0.5. The bootstrapped 95% AUC confidence interval for Dahl 2021 was 0.71 to 0.84. In terms of calibration, Dahl 2021 was well calibrated with predicted probabilities matching observed probabilities. Bilgory 2023 and López Pérez were poorly calibrated. Multiple prediction tools have now been externally validated for ECV success. Dahl 2021 is the most promising prediction tool. · Prediction models can be powerful tools for patient counseling.. · The odds of ECV success can estimated based on patient factors and clinical findings.. · Of the six tested models, only Dahl 2021 appears to have good predictive value and calibration..

Prediction of intrapartum caesarean section in vaginal breech birth: development of models for nulliparous and multiparous women.

To develop prediction models for intrapartum caesarean section in vaginal breech birth. This single-center cohort-study included 262 nulliparous and 230 multiparous women attempting vaginalbreech birth. For both groups, we developed and (internally) validated three models for the prediction of intrapartum cesarean section. The prediction model for nulliparous women (AUC:0.67) included epidural analgesia (aOR 2.14; p=0.01), maternal height (aOR 0.64 per 10 cm; p=0.08), birthweight≥3.8 kg (aOR 2.45; p=0.03) and an interaction term describing the effect of OC if birthweight is≥3.8 kg (aOR0.24; p=0.04). An alternative model for nulliparous women which, instead of birthweight, included fetal abdominal circumference with a cut-off at 34 cm (aOR 1.93; p=0.04), showed similar performance (AUC: 0.68). The prediction model for multiparous women (AUC: 0.77) included prelabor rupture of membranes (aOR 0.31; p=0.03), epidural analgesia (aOR 2.42; p=0.07), maternal BMI (aOR 2.92 per 10 kg/m2; p=0.01) and maternal age (aOR 3.17 per decade; p=0.06). Our prediction models show the most relevant risk factors associated with intrapartum cesarean section in vaginal breech birth for both nulliparous and multiparous women. Importantly, this study clarifies the role of the OC byshowing that this parameter is only associated with intrapartum cesarean section if birthweight is above 3.8 kg (or abdominal circumference is above 34 cm). Conversely, knowing the OC when the birthweight is less than 3.8 kg (orabdominal circumference is less than 34 cm) did not improve prediction of this surgical outcome.

Outcomes in term breech birth according to intended mode of delivery-A Swedish prospective single-center experience of a dedicated breech birth team.

The appropriate mode of delivery for breech babies is a topic of ongoing debate. After the publication of the Term Breech Trial in 2000, the proportion of breech babies delivered vaginally in Sweden rapidly dropped to 7% from 26%. In 2015, international guidelines changed to once again recommend offering vaginal breech deliveries in select cases. In 2017, a Swedish hospital established a dedicated Breech Team to provide safe vaginal breech deliveries according to the new guidelines. The aim of this study is to compare neonatal morbidity in the group planned for cesarean breech delivery with the group planned for vaginal breech delivery treated in accordance with the new guidelines. The study adds to the literature by providing insights into the consequences of reintroducing vaginal breech births in a high-resource health-care setting. A prospective observational study was conducted at Södersjukhuset's maternity ward with 1067 women who gave birth to a single breech fetus at term. Outcomes were compared between the planned vaginal and planned cesarean delivery groups using intention-to-treat analysis and multivariate analysis to control for confounders. Out of the 1067 women, 78.9% were planned for cesarean delivery and 21.1% were planned for vaginal delivery. The planned vaginal group had a significantly greater risk for neonatal morbidity compared to the planned cesarean group (3.1% vs. 0.7%; OR 4.44, 95% CI 1.48-13.34). The risk difference remained significant after controlling for confounders. Planned vaginal breech delivery was associated with an increased risk of neonatal mortality and short-term morbidity compared to planned cesarean breech delivery in accordance with the new guidelines. The potential risks and benefits of planned vaginal breech delivery should be carefully weighed against those of planned cesarean delivery.

Maternal and neonatal outcomes associated with breech presentation in planned community (home and birth center) births in the United States: A prospective observational cohort study.

Investigate maternal and neonatal outcomes associated with breech presentation in planned community births in the United States, including outcomes associated with types of breech presentation (i.e., frank, complete, footling/kneeling). Secondary analysis of prospective cohort data from a national perinatal data registry (MANA Stats). Planned community birth (homes and birth centers), United States. Individuals with a term, singleton gestation (N = 71,943) planning community birth at labor onset. Descriptive statistics to calculate associations between types of breech presentation and maternal and neonatal outcomes. Maternal: intrapartum/postpartum transfer, hospitalization, cesarean, hemorrhage, severe perineal laceration, duration of labor stages and membrane rupture Neonatal: transfer, hospitalization, NICU admission, congenital anomalies, umbilical cord prolapse, birth injury, intrapartum/neonatal death. One percent (n = 695) of individuals experienced breech birth (n = 401, 57.6% vaginally). Most fetuses presented frank breech (57%), with 19% complete, 18% footling/kneeling, and 5% unknown type of breech presentation. Among all breech labors, there were high rates of intrapartum transfer and cesarean birth compared to cephalic presentation (OR 9.0, 95% CI 7.7-10.4 and OR 18.6, 95% CI 15.9-21.7, respectively), with no substantive difference based on parity, planned site of birth, or level of care integration into the health system. For all types of breech presentations, there was increased risk for nearly all assessed neonatal outcomes including hospital transfer, NICU admission, birth injury, and umbilical cord prolapse. Breech presentation was also associated with increased risk of intrapartum/neonatal death (OR 8.5, 95% CI 4.4-16.3), even after congenital anomalies were excluded. All types of breech presentations in community birth settings are associated with increased risk of adverse neonatal outcomes. These research findings contribute to informed decision-making and reinforce the need for breech training and research and an increase in accessible, high-quality care for planned vaginal breech birth in US hospitals.

Barriers and facilitators for implementation of OptiBreech collaborative care: A qualitative study as part of an implementation process evaluation

ProblemLack of opportunity for breech training and clinical experience reduced professional confidence and expertise in supporting vaginal breech birth. BackgroundOptiBreech collaborative care is a care pathway for breech presentation at term that aims to enable improve safety through person-centred care and improved training opportunities for maternity professionals, within dedicated clinics and intrapartum support. In feasibility work, barriers and facilitators to team implementation were observed by team members. AimThis study sought to describe factors affecting optimal future implementation and safety of OptiBreech care. MethodsSemi-structured interviews were conducted with staff members at 13 OptiBreech trial sites (17 midwives and 4 obstetricians, n=21), via video conferencing software. The Theoretical Domains Framework (TDF) was used to identify factors impacting team implementation. Themes identified in the TDF were refined in reflexive discussion and grouped into key facilitators, key barriers, and dynamic factors (which span both barriers and facilitators). The interviews were then coded, analysed, and interpreted according to the refined framework. FindingsThe key facilitators were broadly categorised within skill development, beliefs about capabilities, and social support from the wider multidisciplinary team. Key barrier categories were resources, social obstacles, and fears about consequences. Dynamic factor categories were individual responsibility, training, and attending births. ConclusionWhile some factors affecting implementation were specific to the individuals and cultures of certain Trusts, recommendations emerged from analysis that are more widely applicable across multiple settings. These should be considered going forward for future service implementation, and in the next stage of OptiBreech clinical trials.

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

ObjectivesThe 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. ResultsOf 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). ConclusionThe 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.

Ready to Care for Pregnant Women with Breech Presentation? - Results from an Online Survey for Midwives and Midwifery Students in Germany, Austria, and Switzerland

The vaginal birth of breech presentation is an option for pregnant women supported by current German and international guidelines when favorable conditions and appropriately trained personnel are available. According to midwifery laws in the D-A-CH region, midwives should be able to provide care for a vaginal breech birth in emergencies. Therefore, imparting skills for breech delivery is enshrined in the curriculum for midwifery students. This study evaluated the knowledge and training needs of midwives and midwifery students in the German-speaking region. In May 2022, experiences, specific knowledge, and further training needs regarding vaginal breech birth were assessed through an online survey. Analysis of 467 questionnaires showed that only 30% of respondents currently attend vaginal breech births in their professional environment, but 50% would like to offer this service. 94% of respondents indicated that they would feel more confident if regular training opportunities, particularly simulations and virtual offerings, were provided for vaginal breech birth. However, currently only 10% of respondents receive regular training opportunities for vaginal breech births. The results suggest an increased provision of training opportunities for vaginal breech births to enhance midwives' safety in managing such births.

Variations of cervical head entrapment in vaginal breech births: New insights on how to prevent, manage and resolve

This paper presents a novel, systematic way to understand the causes of cervical head entrapment in vaginal breech births, and new insights into management. Three different types of cervical head entrapment are described, with detailed illustrations: unpredictable and potentially catastrophic, manageable, and preventable. The first affects preterm and growth-restricted fetuses. The second involves some degree of uterine prolapse. The third may result from prolonged head entrapment at the pelvic inlet, leaving time for cervical contraction or oedematous entrapment. Traditional and innovative strategies to resolve and prevent this complication are described and illustrated, with suggestions for further research.

Consensus-based recommendations for the care of women with a breech presenting fetus

ObjectiveTo establish consensus related to aspects of breech presentation and care. DesignA multinational, three round e-Delphi study. ParticipantsA panel of 15 midwives, four obstetricians and an academic with knowledge and/or experience of caring for women with a breech presenting fetus. MethodsAn initial survey of 45 open-ended questions. Answers were coded and amalgamated to form 448 statements in the second round and three additional statements in the third round. Panellists were asked to provide their level of agreement for each statement using a 5-point Likert scale. Consensus was deemed met if 70% of panellists responded with strongly agree to somewhat agree, or strongly disagree to somewhat disagree after the second round. FindingsResults led to the development of a consensus-based care pathway for women with a breech presenting fetus and a skills development framework for clinicians. Key conclusionsA cultural shift is beginning to occur through the provision of physiological breech workshops offered by various organisations and may result in greater access to skilled and experienced clinicians for women desiring a vaginal breech birth, ultimately improving the safety of breech birth. Implications for practicesThe care pathway and skills development framework can be used by services wishing to make changes to their current practices related to breech presentation and increase the level of skill in their workforce.

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

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. 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. 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. 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.

How safe is it to plan a vaginal breech birth with OptiBreech collaborative care?: analysis of cumulative data within the OptiBreech Multiple Trials Cohort

Background OptiBreech collaborative care is a multi-disciplinary care pathway for breech presentation at term. The OptiBreech Multiple Trial Cohort is designed to host multiple trials related to care for breech presentation. This design enables prospective data collection for a large cohort of women planning a vaginal breech birth (VBB), to assess rare safety outcomes, while answering questions requiring a smaller, randomised sample nested within this cohort. Methods OptiBreech database currently contains participants recruited from 10 January 2022, including 67 women randomised to either OptiBreech care or standard care, and 116 women who received OptiBreech care and were not randomised. Primary outcomes included vaginal birth rate, composite neonatal morbidity and mortality and composite maternal neonatal morbidity and mortality. Descriptive statistics for the entire cohort were analysed in SPSS Version 29. Sub-group analyses were identified through participant involvement and engagement work as important to support informed decision-making. Results Of 97 women who planned a VBB at any point, 44 (45.4%) achieved a vaginal birth, compared to 29/77 (37.7%) of women who did not plan a VBB. Admission rates to a neonatal unit were similar, 4/97 (4.1%) versus 3/77 (3.9%). In this cohort, there was no severe neonatal morbidity following planned VBB, compared to 3/77 (3.9%) among the cohort who did not plan a vaginal breech birth and 2/52 (3.7%) among women who planned a cephalic birth. Severe maternal morbidity following planned VBB was 7/89 (7.9%), compared to 9/76 (11.8%) for women who did not plan a VBB and 8/54 (14.8%) for women who planned a cephalic birth. Conclusions Planning a VBB with OptiBreech collaborative care has thus far been as safe as not planning a VBB. Detecting differences in rare outcomes will require thousands of births. Outcomes will continue to be monitored and reported here as the cohort grows.

"I had no choice": A mixed-methods study on access to care for vaginal breech birth.

Although current recommendations support vaginal breech birth as a reasonable option, access to breech birth in US hospitals is limited. This study explored the experiences of decision-making and perceptions of access to care in people who transferred out of the hospital system to pursue home breech birth. We conducted a mixed methods study of people with a singleton, term breech fetus who transferred out of the US hospital system to pursue home breech birth. Twenty-five people completed an online demographic and psychosocial survey, and 23 (92%) participated in semi-structured interviews. We used an interpretive description approach informed by situational analysis to analyze qualitative data about participants' experiences and perceived access to care. Of 25 individuals who left the hospital system to pursue a home breech birth, most felt denied informed choice (64%) and threatened or coerced into cesarean (68%). The majority reported low or very low autonomy in decision-making (n = 20, 80%) and high decisional satisfaction using validated measures. Many participants felt safer in a hospital setting but were not able to access care for planned vaginal breech hospital birth, despite extensive efforts. Participants felt "backed into a corner" and "forced into homebirth," perceiving a lack of access to safe and respectful care in the hospital system. Some service users believe that home birth is their only option when they cannot access hospital-based care for vaginal breech birth. Current barriers to care for breech birth limit birthing people's autonomy and may be placing them and their infants at increased risk.

The feasibility of team care for women seeking to plan a vaginal breech birth (OptiBreech 1): an observational implementation feasibility study in preparation for a pilot trial

BackgroundOptiBreech Care is a care pathway for breech presentation at term, including where chosen, physiological breech birth attended by professionals with advanced training and/or proficiency. We aimed to assess the feasibility of implementing OptiBreech team care prior to proceeding with a planned pilot randomised controlled trial.MethodsOur design was an observational implementation feasibility assessment across England and Wales, January 2021–June 2022. Our objectives were to determine whether Trusts could provide attendants with advanced training (implementation feasibility), who deliver protocol-consistent care (fidelity), within existing resources (costs), while maintaining low neonatal admission rates (safety) and adequate recruitment rates (trial feasibility). Participants included women > 37 weeks pregnant with a breech-presenting foetus, requesting support for a vaginal breech birth following standard counselling, and staff involved in the study. No randomisation occurred in this first stage of feasibility work.ResultsThirteen National Health Service sites were recruited. A total of 82 women planned births in the study. Sites with a breech specialist midwife recruited at double the rate of sites without (0.90/month, 95% CI 0.64–1.16 vs 0.40, 95% CI 0.12–0.68). Referrals into the study came from midwives (46%), obstetricians (34%) and women themselves (20%). Vaginal births were attended by staff with OptiBreech training at 87.5% (35/40, 95% CI 0.732–0.958) and by staff who met additional proficiency criteria at 67.5% (27/40, 95% CI 0.509–0.814). Fidelity criteria were more consistently met by staff who also met proficiency criteria. There were four neonatal admissions (4.9%, 4/82), including one serious adverse outcome (1.2%, 1/82).ConclusionsA prospective observational cohort of OptiBreech collaborative care, which could potentially support nested or cluster randomisation, appears feasible in sites willing to establish a dedicated clinic and strategically develop further proficient members of staff, with back-up plans for supporting rapidly progressing births. Randomisation procedures remain to be feasibility tested. It is funded by the NIHR (NIHR300582).

Magnetic resonance imaging in late pregnancy to improve labour and delivery outcomes – a systematic literature review

BackgroundMagnetic resonance imaging (MRI) provides excellent soft tissue visualisation which may be useful in late pregnancy to predict labour outcome and maternal/neonatal birth trauma.ObjectiveTo study if MRI in late pregnancy can predict maternal and neonatal outcomes of labour and birth.MethodsSystematic review of studies that performed MRI in late pregnancy or immediately postpartum. Studies were included if they imaged maternal pelvic or neonatal structures and assessed birth outcome. Meta-analysis was not performed due to the heterogeneity of studies.ResultsEighteen studies were selected. Twelve studies explored the value of MRI pelvimetry measurement and its utility to predict cephalopelvic disproportion (CPD) and vaginal breech birth. Four explored cervical imaging in predicting time interval to birth. Two imaged women in active labour and assessed mouldability of the fetal skull. No marker of CPD had both high sensitivity and specificity for predicting labour outcome. The fetal pelvic index yielded sensitivities between 59 and 60%, and specificities between 34 to 64%. Similarly, although the sensitivity of the cephalopelvic disproportion index in predicting labour outcome was high (85%), specificity was only 56%. In women with breech presentation, MRI was demonstrated to reduce the rates of emergency caesarean section from 35 to 19%, and allowed better selection of vaginal breech birth. Live birth studies showed that the fetal head undergoes a substantial degree of moulding and deformation during cephalic vaginal birth, which is not considered during pelvimetry. There are conflicting studies on the role of MRI in cervical imaging and predicting time interval to birth.ConclusionMRI is a promising imaging modality to assess aspects of CPD, yet no current marker of CPD accurately predicts labour outcome. With advances in MRI, it is hoped that novel methods can be developed to better identify individuals at risk of obstructed or pathological labour. Its role in exploring fetal head moulding as a marker of CPD should be further explored.

Management of term breech presentation

Key content While most breech babies are delivered by caesarean section, a small number are born vaginally. Detailed counselling and an accoucher skilled in vaginal breech birth (VBB) are essential for offering the modality. External cephalic version (ECV) is safe, acceptable to most women, has few contraindications and increases vaginal birth rates. Undiagnosed term breech presentation can largely be prevented by routine third‐trimester ultrasound. Research is needed to evaluate the efficacy of VBB simulation training in clinical practice. Learning objectives To understand the evidence base around breech presentation at term, including ECV, VBB, caesarean section and adjunctive methods of cephalic version. To understand the prerequisites for, and contraindications to, VBB. To understand the principles of physiological breech birth. To appreciate the variation in management of term breech presentation internationally and understand the impact of various publications. Ethical issues With falling rates of VBB, and many units now unable to offer the modality, questions surround the appropriateness of national guidance continuing to present vaginal breech as routine. Conversations around breech birth isolate discussion of risk to the fetus. Maternal risk, which may extend beyond the current pregnancy, cannot be overlooked.

Bottoms up down under a Case Report of Emergency Vaginal Breech Delivery using Telehealth in Australian Remote Community

This report describes the use of Telehealth in outback Australia. In this case, an obstetrician could reach out and guide a primary health care worker to successfully resolve an obstructed delivery during the vaginal breech birth of an indigenous woman in a remote regional community. The events occurred in a small community health centre, approximately 300 km from the nearest obstetric service. The mother presented unexpectedly with contractions of active preterm labour leading to precipitant delivery. At the time of the video link, the Obstetrician saw a young aboriginal woman lying supine on a table, her skirt raised and her legs parted. A baby's lower limbs and body lay prone and unmoving, the head and neck still within the vagina. The woman was exhausted, and her care attendants were uncertain what to do. The situation was highly critical. After a moment of summation, the Obstetrician garnered the resources available, including the woman's sister, who was standing by her side, and the primary health care worker and coached them through the required steps of delivery to allow extraction and immediate neonatal resuscitation. The outcome was excellent, a testament to the mother's resilience and the support of her team. The case highlights inequalities faced by regional Australians; the isolation of profound distance, the scarcity of resources and opportunity, the proclivity of disease and risk, and the insatiable attrition of healthcare services inexorably stretched beyond their means. In this setting, it offers hope by acknowledging the success of innovative technologies such as Telehealth which can broaden the reach of virtual, face-to-face communication and allow us to connect in real-time to areas not otherwise accessible.

Breech specialist midwives and clinics in the OptiBreech Trial feasibility study: An implementation process evaluation.

Attendance of skilled and experienced professionals at breech births has been associated with a reduction in adverse perinatal outcomes. We aimed to determine whether United Kingdom National Health Service (NHS) sites could reliably provide attendants with OptiBreech training and/or advanced proficiency (intervention feasibility) and consistent care (fidelity) that meets women's needs (acceptability), with low neonatal admission rates (safety) and recruitment adequate to support a clinical trial (trial feasibility). Mixed methods implementation evaluation was used. Settings were 13 services in England and Wales. Participants were 82 women requesting support for a vaginal breech birth (VBB) at term. Outcomes were descriptively analyzed. Twenty-one women were interviewed, and transcripts were analyzed using the Theoretical Framework of Acceptability. Iterative analysis informed subsequent interviews and the ongoing process of implementation across sites. Although we initially suggested multidisciplinary teams, actively recruiting Trusts yielded services where VBB care was provided through a dedicated clinic, organized and delivered primarily by a lead midwife who functioned as a specialist. This model achieved 87.5% fidelity with the intervention's goal of ensuring the attendance of OptiBreech-trained professionals. Neonatal outcomes remained stable, with an admission rate of 5.5%. Women reported care from specialist midwives as highly acceptable, but the model is vulnerable without a strategic effort to develop additional proficient team members. Dedicated clinics coordinated by specialist midwives appear to be an acceptable and feasible implementation strategy to test the safety and effectiveness of proficient team care for VBB in a clinical trial. Back-up arrangements should be maintained while additional members of the team develop proficiency.

Optimal time intervals for vaginal breech births: a case-control study [version 2; peer review: 1 approved, 2 approved with reservations, 1 not approved

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. 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. 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. 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.

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 conducted 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 &gt;3 minutes (OR: 9.508 [95% CI: 1.390-65.046] p=0.022) and from buttocks on the perineum to head &gt;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 is 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.

Combined Assessment of the Obstetrical Conjugate and Fetal Birth Weight Predicts Birth Mode Outcome in Vaginally Intended Breech Deliveries of Primiparous Women-A Frabat Study.

(1) Background: Guidelines on vaginal breech delivery require birth weight restrictions and neglect the impact of pelvic measurements despite contradicting evidence. There is a great need for more evidence on delivery outcome predicting factors for patients counselling. (2) Methods: We performed a prospective cohort study on 748 primiparous women intending vaginal breech birth and analyzed combined influence of fetal birth weight (BW) and the obstetric conjugate (conjugate vera obstetrica, CVO) on delivery outcome. (3) Results: We generated a BW/CVO ratio and devided our study cohort at median (257.8 g/cm) into a low ratio group (LR, with low birth weight and wide obstetric conjugate) and a high ratio group (HR, high birth weight and narrow obstetric conjugate). Cesarean section (CS) rate was significantly higher in HR (50.3%) as compared to LR (28.3%, p < 0.0001). Fetal morbidity was not different. In vaginally completed deliveries duration of birth was significantly longer in vHR (557 min) as in vLR (414 min, p < 0.001). Manual assistance to deliver the arms (‘Louwen maneuver’) positively correlated with birth weight (r2 = 0.215; p = 0.005) and the BW/CVO ratio (r2 = 0.0147; p = 0.02). (4) Conclusions: A high fetal birth weight combined with a tiny CVO predicts higher cesarean section probability, longer birth duration and the necessity to perform arm delivery assistance. Birth weight and pelvic measurements should be topics of great importance in patients counselling.