How do physicians respond to new medical research?

What happens when the findings of a prominent medical study are overturned? Using a medical trial on breech births, we estimate the effect of the reversal of such a medical study on physician choices and infant health outcomes. Using the United States Birth Certificate Records from 1995 to 2010, we employ a difference-in-differences estimator for C-sections, low Apgar, and low birth weight measures. We find that the reversal of a multi-site, high profile, randomized control trial on the appropriate delivery of term breech births, the Term Breech Trial, led to a 15%-23% decline in C-sections for such births at a time when the overall trend in C-sections was rising. We find our largest estimated effects amongst traditionally disadvantaged groups (i.e., non-white, and minimal education). However, we do not find that such a change in practice had significant impacts on infant health. Contrary to prior studies, we find that physicians updated their beliefs quickly, and do indeed adjust to new medical research, particularly young physicians, prior to mandatory policy or professional guidelines.

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.

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

PROBLEM: Lack of opportunity for breech training and clinical experience reduced professional confidence and expertise in supporting vaginal breech birth. BACKGROUND: OptiBreech 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. AIM: This study sought to describe factors affecting optimal future implementation and safety of OptiBreech care. METHODS: Semi-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. FINDINGS: The 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. CONCLUSION: While 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.

How to: a breech vaginal delivery before 25 weeks of gestation.

Delivery before 25 weeks of gestation has become a more frequent occurrence in our maternity units and can be a difficult obstetrical situation to manage when the fetus is breech. We describe a new obstetrical maneuver enabling vaginal birth of a breech fetus before 25 weeks of gestation. It enables the fetal mobile to be fully grasped and secured, thus facilitating passage through the genital tract.

Impact of a regional simulation-based training course in the implementation of external cephalic version: Intervention study.

OBJECTIVE: The aims of this study were to assess whether a regional simulation-based training course in external cephalic version (ECV) would lead to the adoption of this technique in hospitals where it was not previously practiced, and to improve success rates in those already performing it. METHODS: This was an intervention study where two specialists in obstetrics and gynecology from 10 Portuguese public maternity hospitals attended a structured simulation-based training in ECV. Hospitals were categorized based on whether ECV was conducted prior to the training program, and on their annual number of deliveries. Main outcomes were the number of ECVs performed in the 2 years before and after the course, and their success rates. RESULTS: Implementation of ECV was achieved in four additional hospitals during the 2 years following the course. Among the three hospitals already performing ECV and able to report their data, no significant differences in success rates were observed in the 2 years following the course (45.6% vs. 47.9%, P = 0.797). After a successful ECV, 77.7% of women had a vaginal delivery. CONCLUSION: A regional simulation-based training course in ECV led to an increase in the number of hospitals implementing the technique in the subsequent 2 years, but it did not impact the success rates in centers where it was already performed. This study highlights the potential of simulation-based courses in ECV, as well as the need to improve patients´ access to the technique and to centralize ECV services at a regional level.

Circumferential Vaginal Tear During the Cesarean Section: A Complication of Vaginal Hand Assistance in a Deeply Impacted Fetal Head.

We present the case of a 29-year-old, G2P1+0 pregnant woman who was unbooked and presented to the emergency room at 36+5 weeks gestation with complaints of leaking liquor, labour pains, vaginal bleeding and raised blood pressure. Her history revealed previous vaginal delivery and index pregnancy complicated with obstetric cholestasis, pre-eclampsia, and fetal growth restriction. During her hospital course, the patient underwent an emergency cesarean section due to uncontrolled blood pressure and pathological cardiotocograph (CTG) revealing a deeply impacted fetal head intraoperatively and necessitating an inverted T incision on the uterus. Although the newborn was delivered successfully, a full-thickness circumferential tear in the vaginal vault was discovered, requiring immediate surgical repair with the involvement of a urologist. The patient experienced postoperative complications related to pre-eclampsia and sepsis but was eventually discharged in stable condition. This case highlights the importance of prompt diagnosis and management of obstetric emergencies especially in the case of deeply impacted fetal head, and the need for a multidisciplinary approach to address complications such as vaginal tears during cesarean sections due to vaginal assistance in delivering the baby.

Neonatal Outcome following External Cephalic Version (ECV)-Comparison between Vaginal Birth after Successful ECV and Elective Caesarean Section after Unsuccessful ECV.

Introduction: In 3-6% of pregnancies, foetuses can be expected to be in a breech presentation near term. Consultation concerning further management of the pregnancy, including the option of an external cephalic version (ECV), is recommended by international guidelines (RCOG, ACOG, and DGGG). With regards to an ECV, there need to be two assumptions. Firstly, the procedure is safe, which has been shown adequately. Secondly, a vaginal birth after a successful ECV needs to prove to be non-inferior to the alternative of an elective caesarean section. The aim of this study is to assess the non-inferiority assumption. Methods: Overall, 142 singleton pregnancies were analysed that presented a foetus in a non-cephalic presentation and underwent an ECV near term between 2011 and 2020. The ECV was performed at 36 weeks of gestation for primiparous women and at 37/38 weeks of gestation for multiparous women. To assess neonatal outcome, the following parameters were recorded: arterial and venous umbilical cord blood pH, APGAR scores and admission to the neonatal intensive care unit (NICU). Data were analysed under the assumption that neonatal outcome does not differ between elective caesarean sections with or without an ECV in advance. Results: The success rate of an ECV was 56.3% (80/142). In the case of a successful ECV, there was a 77.5% (62/80) chance for a vaginal delivery. The mean arterial pH for neonates born vaginally after successful ECV was 7.262 (SD 0.089), compared to 7.316 (SD 0.051) for those born via elective caesarean section (p < 0.001). APGAR scores at 1, 5, and 10 min were similar between the groups, with a slightly higher proportion of neonates scoring below the median in the caesarean section group. Specifically, 13.7% (7/51) at 1 min, 15.7% (8/51) at 5 min, and 9.8% (5/51) at 10 min in the caesarean section group were below the median, compared to 4.92% (3/61), 4.92% (3/61), and 3.28% (2/61) in the vaginal birth group. NICU admission rates were 3.28% for vaginal births and 3.92% for elective caesarean sections (p > 0.05). Conclusions: Women with a successful ECV can expect a neonatal birth outcome after a vaginal birth that is non-inferior to an alternative elective caesarean section.

External cephalic version following prior cesarean delivery: A comparative cohort analysis.

OBJECTIVE: To analyze the success rate of external cephalic version (ECV) in pregnant women with a history of previous cesarean section, as well as to describe the rate of complications associated with the procedure. METHODS: A retrospective cohort study of women who were offered an ECV at "Virgen de la Arrixaca" Clinic University Hospital (Murcia, Spain) between January 2014 and December 2023. We collected data for previous cesarean delivery, obstetric history, fetal presentation, amniotic fluid volume, ECV success rate, complications related to ECV, mode of delivery, and neonatal outcomes. The study confidently performed ECV under sedation with propofol and tocolysis with ritodrine. Univariate and multivariate analyses were conducted to compare the success rate of ECV, ECV complications, and mode of delivery between women with and without previous cesarean sections. RESULTS: Of 1116 pregnant women who were offered ECV, 911 were included in the study, with 42 having a previous cesarean section. The success rate of ECV in pregnant women with a previous cesarean section was 78.6% (adjusted odds ratio 1.18; 95% confidence interval 0.49-2.86; P = 0.708), with a low complication rate of 9.5%, such as non-reassuring fetal heart rate (7.1%) or major vaginal bleeding (2.4%). Of the women who attempted a vaginal delivery after ECV, 80.8% were successful. CONCLUSIONS: These findings support that ECV is a safe and effective option for women with a previous cesarean section, with success rates comparable to those in women without a previous cesarean section.

Cesarean delivery is associated with lower neonatal mortality among breech pregnancies - a systematic review and meta-analysis of preterm deliveries ≤32 weeks of gestation.

OBJECTIVE: To investigate the association between actual and planned modes of delivery, neonatal mortality, and short-term outcomes among preterm pregnancies ≤32 weeks of gestation. DATA SOURCES: A systematic literature search was conducted in three main databases (PubMed, EMBASE, and the Cochrane Central Register of Controlled Trials (CENTRAL) from inception to November 16, 2022. The protocol was registered in advance in the International Prospective Register of Systematic Reviews (CRD42022377870). STUDY ELIGIBILITY CRITERIA: Eligible studies examined pregnancies ≤ 32nd gestational week. All infants received active care, and the outcomes were reported separately by different modes of delivery. Singleton and twin pregnancies at vertex and breech presentations were included. Studies that included pregnancies complicated with preeclampsia and abruptio placentae were excluded. Primary outcomes were neonatal mortality and intraventricular hemorrhage. STUDY APPRAISAL AND SYNTHESIS METHODS: Articles were selected by title, abstract, and full text, and disagreements were resolved by consensus. Random effects model-based odds ratios with corresponding 95% confidence intervals were calculated for dichotomous outcomes. ROBINS-I was used to assess the risk of bias. RESULTS: A total of nineteen observational studies were included involving a total of 16,042 preterm infants in this systematic review and meta-analysis. Actual cesarean delivery improves survival (odds ratio, 0.62; 95% confidence interval, 0.42 to 0.9) and decreases the incidence of intraventricular hemorrhage (odds ratio, 0.70; confidence interval, 0.57 to 0.85) compared to vaginal delivery. Planned cesarean delivery does not improve the survival of very and extremely preterm infants compared to vaginal delivery (odds ratio, 0.87; 95% confidence interval, 0.53 to 1.44). Subset analysis found significantly lower odds of death for singleton breech preterm deliveries born by both planned (odds ratio, 0.56; 95% confidence interval, 0.32 to 0.98) and actual (odds ratio, 0.34; 95% confidence interval, 0.13 to 0.88) cesarean delivery. CONCLUSION: Cesarean delivery should be the mode of delivery for preterm ≤32 weeks of gestation breech births due to the higher mortality in preterm infants born via vaginal delivery.

YouTube as a Source of Patient Information on External Cephalic Version: Cross-Sectional Study.

BACKGROUND: With the global increase of cesarean deliveries, breech presentation is the third indication for elective cesarean delivery. Implementation of external cephalic version (ECV), in which the position of the baby is manipulated externally to prevent breech presentation at term, remains suboptimal. Increasing knowledge for caretakers and patients is beneficial in the uptake of ECV implementation. In recent decades, the internet has become the most important source of information for both patients and health care professionals. However, the use and availability of the internet also bring about concerns since the information is often not regulated or reviewed. Information needs to be understandable, correct, and easily obtainable for the patient. Owing to its global reach, YouTube has great potential to both hinder and support spreading medical information and can therefore be used as a tool for shared decision-making. OBJECTIVE: The objective of this study was to investigate the available information on YouTube about ECV and assess the quality and usefulness of the information in the videos. METHODS: A YouTube search was performed with five search terms and the first 35 results were selected for analysis. A quality assessment scale was developed to quantify the accuracy of medical information of each video. The main outcome measure was the usefulness score, dividing the videos into useful, slightly useful, and not useful categories. The source of upload was divided into five subcategories and two broad categories of medical or nonmedical. Secondary outcomes included audience engagement, misinformation, and encouraging or discouraging ECV. RESULTS: Among the 70 videos, only 14% (n=10) were defined as useful. Every useful video was uploaded by educational channels or health care professionals and 80% (8/10) were derived from a medical source. Over half of the not useful videos were uploaded by birth attendants and vloggers. Videos uploaded by birth attendants scored the highest on audience engagement. The presence of misinformation was low across all groups. Two-thirds of the vloggers encouraged ECV to their viewers. CONCLUSIONS: A minor percentage of videos about ECV on YouTube are considered useful. Vloggers often encourage their audience to opt for ECV. Videos with higher audience engagement had a lower usefulness score compared to videos with lower audience engagement. Sources from medically accurate videos should cooperate with sources with high audience engagement to contribute to the uptake of ECV by creating more awareness and a positive attitude of the procedure, thereby lowering the chance for a cesarean delivery due to breech presentation at term.

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.

Transcervical side by side Foley balloons for preterm breech birth: A new concept to enhance safety.

Preterm breech birth risks head entrapment. Three side-by-side Foley balloons as previously described for labour induction/augmentation may prevent breech expulsion until adequate cervical dilation. We present an illustrative case.

Footling Breech Delivery in an Emergency Department Without Obstetrical Services: A Case Report.

Hospitals without formal obstetric services place the emergency physician in the position of managing potentially complicated precipitous labor and delivery such as breech presentations. Breech deliveries pose an increased risk of significant morbidity and mortality to both the mother and fetus. Recent emphasis on cesarean section as the optimal delivery method for breech presentation has decreased education and comfort levels with breech vaginal deliveries. This case study highlights a patient who presented to a suburban emergency department (ED) in active labor with a footling breech presentation. No obstetrical services were available. The delivery was successful, and the neonate was resuscitated. Though emergency medicine residents receive training in standard vaginal deliveries, most residents do not receive firsthand experience with difficult deliveries. This case highlights the need for policy and procedure and annual competency training for physicians and allied staff in ED facilities without obstetrical services. Structured protocols and annual simulation training will improve outcomes for imminent deliveries with potential complications.

Management of impacted fetal head at cesarean birth: A systematic review and meta-analysis.

INTRODUCTION: Despite increasing incidence of impacted fetal head at cesarean birth and associated injury, it is unclear which techniques are most effective for prevention and management. A high quality evidence review in accordance with international reporting standards is currently lacking. To address this gap, we aimed to identify, assess, and synthesize studies comparing techniques to prevent or manage impacted fetal head at cesarean birth prior to or at full cervical dilatation. MATERIAL AND METHODS: We searched MEDLINE, Emcare, Embase and Cochrane databases up to 1 January 2023 (PROSPERO: CRD420212750016). Included were randomized controlled trials (any size) and non-randomized comparative studies (n ≥ 30 in each arm) comparing techniques or adjunctive measures to prevent or manage impacted fetal head at cesarean birth. Following screening and data extraction, we assessed risk of bias for individual studies using RoB2 and ROBINS-I, and certainty of evidence using GRADE. We synthesized data using meta-analysis where appropriate, including sensitivity analyses excluding data published in potential predatory journals or at risk of retraction. RESULTS: We identified 24 eligible studies (11 randomized and 13 non-randomized) including 3558 women, that compared vaginal disimpaction, reverse breech extraction, the Patwardhan method and/or the Fetal Pillow®. GRADE certainty of evidence was low or very low for all 96 outcomes across seven reported comparisons. Pooled analysis mostly showed no or equivocal differences in outcomes across comparisons of techniques. Although some maternal outcomes suggested differences between techniques (e.g., risk ratio of 3.41 [95% CI: 2.50-4.66] for uterine incision extension with vaginal disimpaction vs. reverse breech extraction), these were based on unreliable pooled estimates given very low GRADE certainty and, in some cases, additional risk of bias introduced by data published in potential predatory journals or at risk of retraction. CONCLUSIONS: The current weaknesses in the evidence base mean that no firm recommendations can be made about the superiority of any one impacted fetal head technique over another, indicating that high quality training is needed across the range of techniques. Future studies to improve the evidence base are urgently required, using a standard definition of impacted fetal head, agreed maternal and neonatal outcome sets for impacted fetal head, and internationally recommended reporting standards.

Quantification of suppressor effects on breech and action noise from AR-15 pattern firearms and its implications for the protection of human hearing.

Noise from firearms is well known to be harmful to human hearing. This problem has been addressed by various military units through the use of muzzle suppressors. However, as suppressor technology has advanced, shooters report hearing the mechanical action of gas-operated semi-automatic rifles (ArmaLite Rifle Model 15 style aka AR-15) as being louder than the suppressed muzzle noise. This study aims to evaluate if harmful noise is present in the shooter's ear, even when impulse noise emanating from the muzzle is suppressed. To characterize the impulse noise of the firearm action caused by the reciprocation of the bolt carrier group (BCG) and subsequent impact when it returns to battery (the forward locked position), the muzzle of a rifle was placed through a constructed plywood wall, and the noise of the action/breech was measured independently from the muzzle noise. This research finds that the impact of the BCG returning to battery (132 dBZ) has the potential to be harmful to the shooter's hearing even when the noise from the muzzle is effectively suppressed.

Does overweight and obesity have an impact on delivery mode and peripartum outcome in breech presentation? A FRABAT cohort study.

PURPOSE: Obesity is a worldwide and growing issue affecting women in childbearing age, complicating surgical procedures as well as pregnancy. Through a reduction of not necessarily required cesarean deliveries-for instance in pregnancies with breech presentation-obesity mediated and surgery-associated morbidity might be contained. Date on the impact of maternal BMI in vaginally attempted breech delivery is not existing. To give insight into whether an elevated BMI leads to an increased perinatal morbidity in vaginally intended deliveries out of breech presentation, we analyzed delivery outcome of laboring women with a singleton baby in breech presentation with overweight and obesity (BMI ≥ 25 kg/m2) in comparison to women with a BMI of below 25 kg/m2. METHODS: Based on data from January 2004 to December 2020, a cohort study was performed on 1641 women presenting with breech presentation at term (> 37 weeks). The influence of maternal BMI on perinatal outcome was analyzed with Chi2 testing for group differences and logistic regression analysis. Patients with a hyperglycemic metabolism were excluded from the study. RESULTS: Fetal morbidity was not different when patients with a BMI of ≥ 25 kg/m2 (PREMODA morbidity score 2.16%) were compared to patients with a BMI of below 25 kg/m2 (1.97%, p = 0.821). Cesarean delivery rates were significantly higher in overweight and obese women with 43.9% compared to 29.3% (p < 0.0001). BMI and cesarean delivery were significantly associated in a logistic regression analysis (Chi2 coefficient 18.05, p < 0.0001). In successful vaginal deliveries out of breech presentation, maternal perineal injury rates (vaginal birth in normal-BMI women 48.4%; vaginal birth in overweight and obese women: 44.2%; p = 0.273) and rates of manually assisted delivery (vaginal birth in normal-BMI women: 44.4%; vaginal birth in obese and overweight women: 44.2%; p = 0.958) were not different between BMI groups. CONCLUSIONS: Obesity and overweight are not associated with peripartum maternal or newborn morbidity in vaginally attempted breech delivery, if the patient cohort is thoroughly selected and vaginal breech delivery is in an upright maternal position. Reduction of cesarean delivery rates, especially in overweight and obese women might, have an important positive impact on maternal and newborn morbidity.

Assisted reproductive technology (ART) is not an independent risk factor for breech presentation among singleton term births in Vienna, Austria.

Assisted reproductive technologies (ARTs) such as in vitro fertilisation (IVF) and intracytoplasmic sperm injection (ICSI) are still discussed critically, as there is no consensus on whether these treatments could be the cause of risk factors for obstetric problems such as breech presentation. The aim of this study was to test the association between ART and breech presentation among 11920 singleton term births taking place in Vienna from 2010 to 2020. In this single-centre medical record-based study, data concerning the conception mode (spontaneous versus IVF or ICSI), child presentation, birth mode, newborn sex and size as well as age, height, weight, and reproductive history of the mother were included. Three hundred twenty-six newborns (2.7%) were conceived by IVF or ICSI, and 527 newborns (4.4%) were delivered in breech presentation. Breech presentation occurred in 7.6% of IVF/ICSI children but only in 4.3% of spontaneously conceived children (P = 0.019). ART increased the crude risk of breech presentation significantly (OR = 1.67; 95% CI 1.71 - 2.38). After adjusting for maternal age, height, number of previous births, smoking, and newborn sex, however, ART had no longer a significant impact on the risk of breech presentation. In contrast, breech presentation was significantly associated with higher maternal age as well as a lower number of previous births, but not with ART. This study shows that the adverse outcomes of IVF and ICSI pregnancies may not be due to the ART treatment alone but might also be due to the mostly higher age and lower parity of the mothers using ART.

Women's experiences with planned singleton upright breech birth - A phenomenological study.

OBJECTIVE: To explore the experience of primi- and multiparous women with planned singleton upright breech births. METHOD: We conducted face-to-face, in-depth interviews with five primiparous and five multiparous women who underwent a physiological breech birth at one hospital in Norway and analyzed the data using Giorgi's descriptive phenomenological method. RESULTS: The phenomenon of women's experiences with physiological breech birth yielded four main constituents: "Mental preparedness and control", "The importance of shared decision-making and sufficient information", "Trust and the many 'faces' of birthing staff", and "'I actually did it!': Coping and control in the upright breech position". The significance of readiness, the influence of previous experiences and information, and the establishment of trust in midwives and gynecologists emerge as dominant themes. The sense of co-determination, control, and mastery is also highlighted. CONCLUSIONS: Our findings underscore the pivotal role of personal attributes in fostering mental preparedness when confronted with unforeseen aspects of childbirth. Notably, women's experiences with upright breech birth vary; while some perceive it as an ideal birth, others find it more challenging. Factors such as unpreparedness, lack of information, diminished co-determination, and loss of control negatively impact birth experiences. This study's findings underscore the significance of tailoring maternity care to individual needs and improving information sharing. These measures are paramount for optimizing women's experience during upright breech births.

The influence of MRI-based pelvimetric measurements in mother's choice of delivery in fetal breech position.

INTRODUCTION: At term, about 3-4% of all singleton pregnancies present as breech. MRI-based pelvimetry is a valuable tool to support selection of adequate candidates for a trial-of-labor in women expecting term breech babies. Shared decision-making is playing an increasingly important role in obstetrics. Since the divergent existing knowledge of breech term delivery needs to be discussed with the pregnant woman, we examined the influence of MRI results on the shared decision-making process in women with term breech presentation. METHODS: Between 08/2021 and 12/2022, anamnestic and clinical parameters were collected from singleton pregnancies expecting term breech babies resulting in birth at the Hanover Medical School. After information, written consent and inclusion, clinical parameters, the course of birth and the maternal and fetal outcome were collected retrospectively. 32 women participated in a postpartum questionnaire study on inquiry. The subsequent acquisition of information and the arguments in the decision-making process were determined. In addition, the sense of security and self-determination was asked both before and during birth. RESULTS: 50% of the respondents had not decided for a mode of delivery before having MRI pelvimetry. After imaging and information, about the own pelvic dimensions and predictors for a successful vaginal birth, 80% of this subgroup decided to give birth vaginally. Over 40% of the collective descripted that they made a decision based on the result of MRI pelvimetry. None of the women felt to be insecure after having talked about the MRI results. The elective cesarean section group and the group of those who delivered vaginally were approximately equally highly satisfied with their feeling of self-determination of the birth mode. Overall, the study population had a very positive birth experience. The group of women who had delivered by elective cesarean showed a wider range in their assessment and appeared to perceive the experience more negative than the group of women who had a vaginal birth or emergency cesarean. Fetal and maternal outcomes did not differ between the groups. DISCUSSION: MRT pelvimetry measurements can be used as a predictor for a successful vaginal breech delivery. The additional information obtained from the MRI measurements can be used in the shared decision-making process to decide more easily on the mode of delivery while improving women's awareness and safety. A balanced education on rare and frequently adverse events of vaginal delivery and cesarean section and patient expectations about labor processes must be taken into account.