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Introduction: Cesarean sections are increasing worldwide and are associated with altered risks of complications for both mother and child. Vaginal birth after cesarean section is associated with lower maternal and neonatal morbidity than in repeat cesarean section. Only a few studies have considered the indication for the previous cesarean section to be of importance for the outcome of subsequent labor. The aim of this study was to evaluate whether the indication for a previous cesarean section affects the outcomes at a subsequent delivery in women with induction of labor. Material and Methods: This retrospective cohort study of the four largest delivery units in Stockholm during 2012–2015 included 1150 women with one previous cesarean section with induction of labor. Inclusion criteria: women with induced labor and a previous cesarean section, singleton pregnancy, cephalic presentation, gestational age of ≥34 weeks. The women were grouped by indication for the previous cesarean section. Primary outcome: mode of delivery (vaginal birth after previous cesarean section or repeat cesarean section). Secondary outcomes: induction to delivery time, postpartum hemorrhage, uterine rupture. Neonatal outcomes: birth weight, Apgar score <7, arterial umbilical cord blood gas pH <7.0. Results: Our study found that the indication of labor dystocia at the previous cesarean section, increased the risk of repeat cesarean section (aOR 5.35; 95% CI: 1.64–17.50) in women with induction of labor. Other risk factors for repeat cesarean section were birth weight >4000 g, maternal BMI ≥30 or if vaginal prostaglandin was used as the method for induction of labor. A previous vaginal delivery and use of oxytocin increased the chance of a vaginal delivery in this group of women. Conclusions: Our study showed that the indication for the previous cesarean section affects the outcome in the subsequent delivery in women with induction of labor. If the indication for the previous cesarean section was labor dystocia, the risk of repeat cesarean section was increased. [ABSTRACT FROM AUTHOR]

Introduction: Fetal growth restriction (FGR) is associated with increased risk for stillbirth, perinatal morbidity, cerebral palsy, neurodevelopmental disorders and cardiovascular disease later in life. Identifying small‐for‐gestational‐age (SGA) fetuses is crucial for the diagnosis of FGR. The aim of this study was to investigate the association between antenatal identification of SGA fetuses and severe adverse perinatal and childhood outcome. Material and methods: A register‐based cohort study of all newborns delivered in Stockholm in 2014 and 2017. Inclusion criteria: singleton pregnancies without chromosomal aberrations or structural abnormalities, with a gestational age at delivery between 22+0 and 43+0 (n = 48 843). Data from childbirth records were linked to data from nationwide Swedish registers. Pregnancy including offspring data were reviewed. Adverse outcomes for non‐identified and identified SGA newborns were compared using logistic regression models. Primary outcome was a composite outcome called severe adverse outcome, defined as at least one of the following: stillbirth, severe newborn distress (Apgar score <4 at 5 min, pH <7 or resuscitation activities >10 min), severe neonatal outcome (hypoxic ischemic encephalopathy 2–3, necrotizing enterocolitis, neonatal seizures, intraventricular hemorrhage grade 3–4, bronchopulmonary disease or death at <1 year), severe childhood outcome (cognitive impairment or motor impairment or cerebral palsy or hearing impairment or visual impairment or death at 1–3 years old). Secondary outcomes were stillbirth, severe newborn distress, severe neonatal outcome, severe childhood outcome. Results: No association was found between antenatal identification of SGA fetuses and severe adverse outcome using the complete composite outcome (adjusted odds ratio [aOR] 1.19, 95% confidence interval [CI] 0.93–1.53). In subgroup analyses, non‐identified SGA fetuses had an almost fivefold increased risk for stillbirth (aOR 4.79, 95% CI 2.63–8.72) and an increased risk for severe newborn distress (aOR 1.36, 95% CI 1.02–1.82), but a decreased risk for severe childhood outcome (aOR 0.63, 95% CI 0.40–0.99). No association was found between antenatal identification of SGA and severe neonatal outcome. Conclusions: Non‐identified SGA fetuses have an increased risk for stillbirth and severe newborn distress. Conversely, identified SGA fetuses have an increased risk for severe childhood outcome. [ABSTRACT FROM AUTHOR]

Purpose of this Review: Even today, hundreds of thousands of women die or suffer high levels of morbidity associated with childbirth. One of the most common causes is halted labor progress, or labor dystocia. There have been no developments in the diagnosis or treatment of dystocic deliveries since Friedman designed the Partogram in the 1950s. Oxytocin is the only treatment for dystocic labor. Sometimes, oxytocin is a lifesaver for the woman, especially in severe postpartum hemorrhages. At the same time, it is also one of the most overused drugs in obstetric care. This review article is meant to provide a short overview of the current knowledge of uterine metabolism during labor, uterine lactate production, and its association with labor dystocia. The article also intends to reflect new ways of thinking regarding practical recommendations for treating labor dystocia and offer a look at the future of dystocic labor management. [ABSTRACT FROM AUTHOR]

Introduction Obesity is a globally growing problem. Labor dystocia is associated with obstetric complications, especially among obese pregnant women. Previous studies have shown an association between the level of lactate produced by uterine myocytes during contractions and the level of lactate in the amniotic fluid (AFL). A relationship between a high level of AFL and labor dystocia has also been demonstrated. However, it is still unknown whether the observation applies to all women with labor dystocia, regardless of body mass index (BMI). Aims: This study investigated whether there was any difference in the level of AFL in the three BMI groups and whether there was a difference in labor outcomes between high and low AFL in the different groups. Materials and Methods This cross-sectional study included 1683 women from three different countries. Healthy nulliparous women in active labor were included, and they were grouped according to BMI as normal weighted (<25), overweight (≥25–29), and obese (≥30), respectively. AFL was categorized as high (≥10.1 mmol/l) and low (<10.1 mmol/l). The main outcome was the frequency of cesarean section. Results No difference in AFL levels was found between the three BMI groups at delivery (mean values of 8.2 vs. 8.3 vs. 8.4 mmol/l, p = .3). Obese women with high AFL had a higher frequency of cesarean section than normal-weighted women (16.2 vs. 20.7 vs. 29.2%). Other risk factors associated with cesarean section varied among the different BMI groups. Conclusions This study showed no difference in the mean level of AFL between women with different BMIs. Further, high AFL was associated with a higher frequency of cesarean section in all three BMI groups, suggesting that the level of AFL can in the future be used as a predictor of labor outcome among women with labor dystocia despite their BMI. [ABSTRACT FROM AUTHOR]

Akerud H, Ronquist G, Wiberg-Itzel E. Lactate distribution in culture medium of human myometrial biopsies incubated under different conditions. Am J Physiol Endocrinol Metab 297: E1414-E1419, 2009. First published October 13, 2009; doi: 10.1152/ajpendo.00458.2009.--It is generally believed that a relationship exists between muscle fatigue and intracellular accumulation of lactate. This reasoning is relevant to obstetrical issues. Myocytes in uterus work together during labor, and the contractions need to be strong and synchronized for a child to be delivered. At labor dystocia, the progress of labor becomes slow or arrested after a normal beginning. It has been described that, during labor dystocia, when the force of the contractions is low, the uterus is under hypoxia, and anaerobic conditions with high levels of lactate in amniotic fluid dominate. The purpose of this study was to examine whether myometrial cells are involved in the production of lactate in amniotic fluid and whether there are differences in production and distribution of lactate in cells incubated under aerobic and anaerobic conditions. We also wanted to elucidate the involvement of specific membrane-bound lactate carriers. Women undergoing elective caesarean section were included. Myometrial biopsies from uteri were collected and subjected to either immunohistochemistry to identify lactate carriers or in vitro experiments to analyze production of lactate. The presence of lactate carriers named monocarboxylate transporters 1 and 4 was verified. Myometrial cells produced lactate extracellularly, and the lactate carriers operated differently under anaerobic and aerobic conditions; while being mainly unidirectional under anaerobic conditions, they became bidirectional under aerobic conditions. Human myometrial cells produced and delivered lactate to the extracellular medium under both anaerobic and aerobic conditions. The delivery was mediated by lactate carriers. monocarboxylate transporter 1; monocarboxylate transporter 4; myometrial cells; uterus doi: 10.1152/ajpendo.00458.2009

Cardiotocography (CTG) is a widely used method for assessing fetal wellbeing during labor. It is well-known that CTG has high sensitivity but low specificity. To avoid unnecessary operative interventions, adjunctive methods such as fetal blood sampling (FBS) are used. Few studies have looked into whether FBS can be used during second stage of labor, and in that case, which of the methods (lactate or pH) are preferred. To evaluate clinical effectiveness of measuring lactate versus pH in preventing birth acidemia when FBS was performed during second stage of labor. Secondary analysis of a randomized controlled trial. Thousand three hundred and thirty-eight women with a singleton pregnancy, cephalic presentation, gestational age ≥34 weeks, and indication for FBS during second stage of labor were included. Metabolic acidemia (pH <7.05 and base deficit >12 mmol/l) or pH < 7.00 in cord arterial blood at birth. A composite outcome (metabolic acidemia, pH <7 or Apgar score <4), and rates of operative deliveries. Metabolic acidemia occurred in 4.1% in the lactate versus 5.1% in the pH group (relative risk (RR): 0.80; 95% confidence interval (CI): 0.48–1.35) and pH <7 in 1.4% versus 2.8% (RR: 0.51, 95% CI: 0.23–1.13). Composite outcome was found in 3.8 versus 4.9%, respectively (RR: 0.76; 95% CI: 0.46–1.26). No difference in total operative interventions was found. More cesarean deliveries were performed in the lactate group (16.5 vs. 12.4%; RR: 1.33; 95% CI: 1.02–1.74). When analyzing lactate or pH in fetal scalp blood during second stage of labor neonatal outcomes were comparable. The frequency of total operative interventions was similar but more cesarean deliveries were performed in the lactate group. [ABSTRACT FROM AUTHOR]

Abstract Background Obesity among fertile women is a global problem. 25% of pregnant Swedish women are overweight at admission to the antenatal clinic and 12% of them are considered as obese. Previous studies have shown an increased risk of delivery complications with an elevated maternal BMI. The aim of this study was to evaluate delivery outcomes in relation to maternal BMI on admission to the antenatal clinic. A healthy group of 787 women with full-term pregnancies and spontaneous onset of labor were included in the study. Delivery outcome was assessed in relation to maternal BMI when attending the antenatal clinic. Results The results indicated that in deliveries where the maternal BMI was >30 a high frequency of abnormal CTG trace during the last 30 minutes of labor was shown. A blood sample for evaluation of risk of fetal hypoxia was performed in only eight percent of these deliveries. A spontaneous vaginal delivery without intervention was noted in 85.7%, and 12% of neonates were delivered with an adverse fetal outcome compared to 2.8% in the group with a maternal BMI Conclusion These results indicate an increased risk at delivery for healthy, but obese women in labor. Furthermore, the delivery management may not always be optimal in these deliveries.