Different impacts of various tocolytic agents on increased risk of postoperative hemorrhage in preterm labor women undergoing Cesarean delivery: A population-based cohort study

Tocolytic agents, commonly used for inhibiting preterm labor, pose the risk of uterine atony, leading to postpartum hemorrhage. This study elucidated the effects of different tocolytic agents on postoperative hemorrhage among women in preterm labor undergoing Cesarean delivery (CD). Data from Taiwan National Health Insurance Research Database were analyzed. The risk (adjusted hazard ratio [aHR] and 95% confidence intervals [CI]) of postoperative hemorrhage in CD women with preterm labor diagnosis using tocolytic agents (Tocolysis group) comparing to CD women not using tocolytic agents (Control group) were determined. Impacts of different tocolytic agents in this regard were also investigated. Our data revealed that the incidence (11.7% vs 2.6%, P < .001) and risk (aHR: 1.21, 95% CI: 1.12-1.31, P < .001) of postoperative hemorrhage were significantly higher in the Tocolysis group (n = 15,317) than in the Control group (n = 244,096). Ritodrine was the most frequently used tocolytic agent (80.5%), followed by combination therapy (using more than one tocolytic agents) (8.5%), magnesium sulfate (MgSO4, 4.6%), calcium channel blockers (3.8%), betamimetics other than ritodrine (1.9%), prostaglandin synthase inhibitors (0.5%), and nitrates (0.1%). Barring those using calcium channel blockers and combination therapy, the use of MgSO4 (aHR: 1.43, P = .001), betamimetics other than ritodrine (aHR: 1.71, P < .001), prostaglandin synthase inhibitors (aHR: 2.67, P < .001) and nitrates (aHR: 3.30, P = .001) was associated with higher risks of postoperative hemorrhage compared with ritodrine. In conclusion, CD women with preterm labor diagnosis using tocolytic agents exhibit an increased risk of postoperative hemorrhage and that this risk varies with the use of different tocolytic agents.

Cesarean Section Complications Followed by Bladder Cystotomy and Gross Hematuria Due to Unknown Dense Scar Tissue

Adhesions formed from previous Cesarean section (C-section) are a significant risk factor for bladder injury. We present a case of a 43-year-old pregnant woman who underwent a C-section and experienced severe complications due to adhesions and incisional dehiscence from a previous Cesarean delivery 11 years earlier. Several surgical and non-surgical interventions as radiologic tests, cystotomy, blood transfusion, cystogram, and others were necessary to resolve the issues followed by the Cesarean delivery. It is important for clinicians caring for women undergoing both primary and subsequent Cesarean sections to consider and mitigate risk factors for adhesion development.

Enhanced discharge counseling to reduce outpatient opioid use after cesarean delivery: a randomized clinical trial

BACKGROUND

Strategies to curb overprescribing have focused primarily on the prescriber as the point of intervention. Less is known about how to empower patients to use fewer opioids and decrease the quantity of leftover opioids. Previous studies in nonobstetrical populations suggest that patient counseling about appropriate opioid use improves disposal of unused opioids and overall knowledge about opioid use. Less is known about whether counseling reduces opioid use after hospital discharge.

OBJECTIVE

This study examines whether enhanced discharge counseling on optimal analgesic use after cesarean delivery reduces opioid use and improves proper disposal of unused opioids and opioid use knowledge after hospital discharge.

STUDY DESIGN

Women who underwent an uncomplicated cesarean delivery were randomized to enhanced counseling on optimal analgesic use or usual care. Enhanced counseling addressed the following 4 points: (1) pain is normal after cesarean delivery; (2) scheduled ibuprofen should be taken to maintain baseline pain control; (3) opioids should be used sparingly and should be tapered over several days; and (4) all unused opioids should be returned to pharmacy or flushed in a toilet. All participants received 30 tablets of 5 mg hydrocodone-acetaminophen and 30 tablets of 600 mg ibuprofen at discharge. They were contacted 14 days later to determine opioid use and location of leftover opioids and to complete a 10-question analgesic strategies quiz with a score of 1 to 10. We estimated that outcome data on 172 women total would provide an 80% power to detect a 30% reduction in postdischarge opioid use with enhanced counseling.

RESULTS

Notably, 79% of eligible women consented to the study and 175 of 196 participants (84 enhanced counseling, 91 usual care) completed the follow-up. Compared with usual care, the enhanced counseling group was more likely to follow recommendations for proper opioid disposal (risk ratio, 2.3; 95% confidence interval, 1.3-3.9). They also scored significantly higher on the analgesic strategies quiz (10 points [interquartile range, 9-10] vs 8 points [interquartile range, 7-9]; P<.001) than the usual care group. Although the enhanced counseling group used less opioids (7.5 tablets [interquartile range, 2-15] vs 10.0 tablets [interquartile range, 2-16]; P=.55) and a smaller proportion of prescribed opioids (25.0% [6.7-50.0] vs 33.3% [6.7-53.3], P=.55) than the usual care group, differences were not statistically significant. There was no statistically significant evidence of interaction between participant education level and any of the study outcomes.

CONCLUSION

Enhanced discharge opioid counseling doubled the frequency of participants reporting proper opioid disposal and improved overall knowledge about the risks associated with opioids. This intervention did not decrease opioid use in a population of women with low overall opioid use. These findings highlight possible methods to intervene on the short-term (misuse and diversion) and long-term (persistent opioid use) consequences of overprescribing.

Antimicrobial Dressing versus Standard Dressing in Obese Women Undergoing Cesarean Delivery: A Randomized Controlled Trial

OBJECTIVE

This study aimed to evaluate the effect of a novel antimicrobial dressing on patient satisfaction and health-related quality of life (HRQoL) following a cesarean delivery.

STUDY DESIGN

This was an open-label, single-center, two-arm randomized controlled trial. This study was done at the tertiary center, maternal unit, Galveston, TX. Pregnant women with body mass indices ≥35 kg/m2 were screened for eligibility. Women were randomized to ReliaTect Post-Op Dressing (RELIATECT) or standard wound dressing (STANDARD). Primary outcome was patient satisfaction and HRQoL using validated questionnaires. Secondary outcomes were provider satisfaction, surgical site infection (SSI) rates, and wound complications.

RESULTS

In total, 160 women were randomized. Population characteristics were not significant among groups. RELIATECT dressing group had an overall higher score of satisfaction and HRQoL compared with STANDARD group. Women in the RELIATECT group reported less incision odor and incisional pain. Compared with the STANDARD group, most women in RELIATECT dressing group reported better daily activities, self-esteem, personal hygiene, body image, and sleep. Providers reported that the RELIATECT dressing allowed better assessment of the surgical incision site, allowed patients to shower early, and did observe less wound dressing leakage. No differences were found in other secondary end points.

CONCLUSION

Postcesarean RELIATECT dressing for wound care in pregnant women with obesity had better patient and provider satisfaction as well as better HRQoL scores. Further, level 1 evidence is needed to assess its impact on SSI rates and wound complication, as this trial was not powered to accomplish this goal.

KEY POINTS

· This study was conducted to evaluate RELIATECT on patient satisfaction and HRQoL following a cesarean.. · Post-cesarean RELIATECT dressing for wound care had better HRQoL and patient and provider satisfaction scores.. · This is the first randomized controlled trial evaluating RELIATECT dressing in obese pregnant women undergoing cesarean section..

The Effect of Fluid Therapy Before Spinal Anesthesia on Prevention of Headache After Cesarean Section: A Clinical Trial

BACKGROUND

Despite numerous studies on postdural puncture headache (PDPH) and the factors affecting it, issues such as prevention methods and techniques that are associated with a lower prevalence of this complication are still under discussion and research. The aim of this study was to evaluate the effect of increasing fluid therapy of patients before surgery on the incidence of postoperative headache.

METHODS

This single-blind clinical trial study was performed on 60 patients undergoing elective surgery with spinal anesthesia based on the inclusion criteria in 2017 in Neyshabur. After obtaining the consent of the patients, the participants were randomly divided into two groups of intervention (A) and test (B) (30 people in each group). Data were created by self-checklist and visual analog scale (VAS) pain measurement criteria were recorded by phone during 4, 7, 24, 48, 72 hours, and 7 days after surgery.

RESULTS

In the study, the average headache increased up to 72 hours after surgery in the experimental group and in the intervention group up to 48 hours after surgery and then decreased.

CONCLUSION

The results of our study generally showed that fluid therapy did not reduce headache, but showed decreasing trend of headache. According to the research results, more research is needed on the causes of headache after spinal anesthesia.

Efficacy of Three Antiretroviral Regimens Initiated during Pregnancy: Clinical Experience in Rio de Janeiro

Few studies have compared the clinical efficacy and adverse events of combined antiretroviral therapy (cART) regimens in pregnant women seeking obstetrical care. The objective of this study was to compare the efficacy (virus load response), adverse events, and obstetrical and neonatal outcomes of three different regimens of cART in HIV-infected pregnant women initiating treatment in Rio de Janeiro, Brazil. This was a retrospective cohort study of cART-naive pregnant women who initiated either ritonavir-boosted protease inhibitors (atazanavir or lopinavir), efavirenz, or raltegravir plus a backbone regimen. From 2014 to 2018, 390 pregnant women were followed over time. At baseline, the median viral load (VL) for HIV was 4.1 log copies/ml. Among participants who received cART for 2 to 7 weeks, the VL decline was greater for raltegravir (2.24 log copies/ml) than for efavirenz or protease inhibitors (P < 0.001). Virologic suppression was achieved in 87% of women on raltegravir near delivery versus 73% on efavirenz and 70% on protease inhibitors (P = 0.011). Patients on raltegravir achieved virologic suppression faster than those on other regimens (P = 0.019). Overall, the HIV perinatal infection rate was 1.5%. This clinical study compared three potent and well-tolerated cART regimens and demonstrated that a higher proportion of participants on raltegravir achieved an undetectable HIV VL near delivery (P = 0.011) compared to the other arms. These findings suggest that raltegravir-containing regimens are optimal regimens for women with HIV initiating treatment late in pregnancy.

Evaluation of the Cesarean Scar Niche In Women With Secondary Infertility Undergoing ICSI Using 2D Sonohysterography Versus 3D Sonohysterography and Setting a Standard Criteria; Alalfy Simple Rules for Scar Assessment by Ultrasound To Prevent Health Problems for Women

Background

Many expressions were used to define the defect that is seen by ultrasound after cesarean section (CS) namely scar defect, niche, isthmocele, uterine pouch or diverticula.

Objective

To compare the accuracy of 2 dimensional sonohysterography (2D SHG) to 3 dimensional sonohysterography (3D SHG) in evaluating cesarean section uterine scar depth (D), base width (BW), width (W) and residual myometrial thickness (RMT) in women with secondary infertility and establishment of a standard criteria; Alalfy simple rules for scar assessment.

Patients and Methods

This was an observational cross-sectional comparative study that was conducted on women who presented with secondary infertility and were candidates for intracytoplasmic sperm injection (ICSI) and giving a history of a previous cesarean section. Assessment of uterine scar in each woman was performed using 2D transvaginal ultrasound with sonohysterography (SHG) followed by 3D transvaginal with SHG with evaluation of niche depth, width, RMT, niche BW and RMT/depth ratio. The study was conducted at Algezeera hospital, Egypt.

Results

The present study revealed that 3D ultrasound with SHG is superior in evaluation of the RMT and niche width prior to ICSI providing better characterization of the scar niche.

Conclusion

Scar niche should be assessed by a combined integrated 2D SHG and 3D SHG scan with the specific geometrical and anatomical considerations, Alalfy simple rules for scar niche assessment that involvemeasurement of niche depth, (Base width) BW, width, RMT and RMT/depth ratio in sagittal plane, RMT in coronal plane / niche width in coronal plane ratio (ratio less than 1 denotes scar weakness with more liability for dehiscence).

Trial Registration

Clinical Trials.gov Id NCT04076904.

A new microdialysis probe for continuous lactate measurement during fetal monitoring: Proof of concept in an animal model

INTRODUCTION

Cardiotocography (CTG) is currently the most commonly used method for intrapartum fetal monitoring during labor. However, a high false-positive rate of fetal acidosis indicated by CTG leads to an increase in obstetric interventions. We developed a microdialysis probe that is integrated into a fetal scalp electrode allowing continuous measurement of lactate subcutaneously, thus giving instant information about the oxygenation status of the fetus. Our aim was to establish proof of concept in an animal model using a microdialysis probe to monitor lactate subcutaneously.

MATERIAL AND METHODS

We performed an in vivo study in adult male wild-type Wistar rats. We modified electrodes used for CTG monitoring in human fetuses to incorporate a microdialysis membrane. Optimum flow rates for microdialysis were determined in vitro. For the in vivo experiment, a microdialysis probe was inserted into the skin on the back of the animal. De-oxygenation and acidosis were induced by lowering the inspiratory oxygen pressure. Oxygenation and heart rate were monitored. A jugular vein cannula was inserted to draw blood samples for analysis of lactate, pH, pco2 , and saturation. Lactate levels in dialysate were compared with plasma lactate levels.

RESULTS

Baseline blood lactate levels were around 1 mmol/L. Upon de-oxygenation, oxygen saturation fell to below 40% for 1 h and blood lactate levels increased 2.5-fold. Correlation of dialysate lactate levels with plasma lactate levels was 0.89 resulting in an R2 of .78 in the corresponding linear regression.

CONCLUSIONS

In this animal model, lactate levels in subcutaneous fluid collected by microdialysis closely reflected blood lactate levels upon transient de-oxygenation, indicating that our device is suitable for subcutaneous measurement of lactate. Microdialysis probe technology allows the measurement of multiple compounds in the dialysate, such as glucose, albumin, or inflammatory mediators, so this technique may offer the unique possibility to shed light on fetal physiology during the intrapartum period.

Cesarean delivery after non-medically indicated induction of labor: A population-based study using different definitions of expectant management

INTRODUCTION

Most observational studies found that non-medically indicated induction of labor (IOL) is not associated with an increased risk of cesarean delivery compared with expectant management, defined as all births at a later gestation. However, given the higher rate of cesarean delivery at late term, this definition of the expectant management group might bias the results of observational studies in favor of IOL at early or full term when estimating the risk of short-term (eg up to 1 week) expectant management.

MATERIAL AND METHODS

We conducted a retrospective cohort study including 447 066 singleton term and post-term hospital births that occurred in Austria between 2008 and 2016. Multivariate logistic regression was used to test the association of IOL and cesarean delivery at each week of gestation from 37-41. Expectant management was either defined as all births at "next week or beyond" or "at next week".

RESULTS

Non-medically indicated IOL was associated with increased odds for cesarean delivery at 37 and 38 weeks, and reduced odds at 40 and 41 weeks. At 39 weeks, IOL resulted in comparable cesarean rates compared with expectant management defined as "next week or beyond" (17.2% vs 16.2%; adjusted odds ratio [OR] 0.93; 95% confidence interval [CI] 0.86-1.00; P = .059). However, when defined as births "at the next week", expectant management was associated with significantly reduced odds for cesarean delivery (13.6%; adjusted OR 0.76; 95% CI 0.70-0.82; P < .001). Comparison of the cesarean delivery rates for the two definitions of expectant management showed that the "next week and beyond" model underestimates the benefit of short-term expectant management by up to 1 week, particularly for IOL at weeks 38 and 39.

CONCLUSIONS

Our findings demonstrate that the definition of the expectant management group has a significant impact when analyzing the outcome of IOL in retrospective cohort studies. Non-medically indicated IOL is not an all-or-none choice between "elective" induction and indefinite expectant management. Thus, to define the control group as all births at the next week could be useful for clinical decision-making, as it allows to estimate the risks of expectant management until the next appointment compared with immediate IOL.

Cesarean section in reducing mother-to-child HBV transmission: a meta-analysis

BACKGROUND

A meta-analysis (MA) of natural vs. cesarean births in HBV infected mothers was performed to assess which delivery methods could minimize the mother-to-child transmission (MTCT) of Hepatitis B virus (HBV).

METHODS

Electrical databases PubMed, Embase and Cochrane Library were searched for the English papers about the HBV MTCT up to 19 August 2019. STATA 11.0 software was used for all analysis. Odds ratio (OR) and 95% confidence interval (CI) were used to present the effect size for MTCT at birth and MTCT more than 6 months. Heterogeneity was evaluated using the chi-squared Q and I ² test to determine the use of random effects model or fixed effects model.

RESULTS

A total of 19 articles involving 11,144 HBV-positive pregnant women (5251 underwent natural delivery and 5893 received a cesarean section) were included in the study. The pooled OR for MTCT at birth was 0.42, 95% CI: 0.23-0.76 based on random effect model (I ² = 69.9%, p = .019). Meanwhile, in fixed effect model (I ² = 0.0%, p = .470), the pooled OR for MTCT more than 6 months was 0.62, 95% CI: 0.48-0.81. The results indicated that HBV infection in cesarean births significantly lower than that of vaginal delivery. Subgroup analysis of MTCT more than 6 months was clearly, and the results indicated that cesarean section significantly reduced the risk of MTCT (OR = 0.62, 95% CI: 0.48-0.81, p < .001).

CONCLUSIONS

Cesarean section can reduce the risk of HBV MTCT and should be employed as a preventive measure. Due to the limitations of this study, further multi-center, large-sample randomized controlled trials must be performed to confirm these findings.

Intraoperative ketamine for reduction in postpartum depressive symptoms after cesarean delivery: A double-blind, randomized clinical trial

BACKGROUND

Postpartum depression (PPD) is a common mental disease happens in perinatal period. Ketamine as an anesthesia and analgesia drug has been used for a long time. In recent years, ketamine is proved to have an antidepression effect with a single administration. We hypothesized that intraoperative ketamine can reduce postpartum depressive symptoms after cesarean delivery.

METHODS

In a randomized, double-blind, placebo-controlled study trail, healthy women scheduled for cesarean delivery were randomly assigned to receive intravenous ketamine (0.25 mg/kg diluted to 5 ml with 0.9% saline) or placebo (5 ml of 0.9% saline) within 5 min following clamping of the neonatal umbilical cord. The primary outcome was the degree of postpartum depressive symptoms, which was evaluated by Edinburgh Postnatal Depression Scale (EPDS, a threshold of 9/10 was used) at 1 week, 2 weeks, and 1 month after delivery. The secondary outcome was the numerical rating scale (NRS) score of pain at 2 days postpartum. This trail is registered in the Chinese Clinical Trial Registry, number ChiCTR1900022464.

RESULTS

Between 26 January 2019 and 15 July 2019, 502 subjects were screened and 330 were randomly allocated: 165 (50%) to the ketamine group and 165 (50%) to the placebo group. There were significant differences in the degree of postpartum depressive symptoms between subjects in the ketamine group and the placebo group at 1 week postpartum (13.1% vs. 22.6%, respectively; p = .029). However, no difference was found between subjects in the two groups at 2 weeks (11.8% vs. 16.8%, respectively; p = .209) and 1 month postpartum (10.5% vs. 14.2%, respectively; p = .319). The NRS score of wound pain (3.0 ± 0.9 vs. 4.0 ± 1.0, respectively; p < .001) and uterine contraction pain (3.0 ± 0.9 vs. 4.1 ± 0.9, respectively; p < .001) was lower in the ketamine group at 2 days postpartum compared with placebo group. The prevalence of headache, hallucination, and dizziness was higher in the ketamine group than the placebo group during the operation.

CONCLUSIONS

Operative intravenous ketamine (0.25 mg/kg) can reduce the postpartum depressive symptoms for 1 week. The long-time effect is remained to be seen.

Preoperative Prophylactic Balloon-Assisted Occlusion of the Internal Iliac Arteries in the Management of Placenta Increta/Percreta

Background and Objectives: Preoperative prophylactic balloon-assisted occlusion (PBAO) of the internal iliac arteries minimizes blood loss and facilitates surgery performance, through reductions in the rate of uterine perfusion, which allow for better control in hysterectomy performance, with decreased rates of bleeding and surgical complications. We aimed to investigate the maternal and fetal outcomes associated with PBAO use in women with placenta increta or percreta. Material and Methods: The records of 42 consecutive patients with a diagnosis of placenta increta or percreta were retrospectively reviewed. Of 42 patients, 17 patients (40.5%) with placenta increta or percreta underwent cesarean delivery after prophylactic balloon catheter placement in the bilateral internal iliac artery (balloon group). The blood loss volume, transfusion volume, postoperative hemoglobin changes, rates of hysterectomy and hospitalization, and infant Apgar score in this group were compared to those of 25 similar women who underwent cesarean delivery without balloon placement (surgical group). Results: The mean intraoperative blood loss volume in the balloon group (2319 ± 1191 mL, range 1000–4500 mL) was significantly lower than that in the surgical group (4435 ± 1376 mL, range 1500–10,500 mL) (p = 0.037). The mean blood unit volume transfused in the balloon group (2060 ± 1154 mL, range 1200–8000 mL) was significantly lower than that in the surgical group (3840 ± 1464 mL, range 1800–15,200 mL) (p = 0.043). There was no significant difference in the postoperative hemoglobin change, hysterectomy rates, length of hospitalization, or infant Apgar score between the groups. Conclusion: PBAO of the internal iliac artery prior to cesarean delivery in patients with placenta increta or percreta is a safe and minimally invasive technique that reduces the rate of intraoperative blood loss and transfusion requirements.

Perioperative prophylactic internal iliac artery balloon occlusion in the prevention of postpartum hemorrhage in placenta previa: a randomized controlled trial

BACKGROUND

Placenta previa remains one of the major causes of massive postpartum hemorrhage and maternal mortality worldwide.

OBJECTIVE

To determine whether internal iliac artery balloon occlusion during cesarean delivery for placenta previa could reduce postpartum hemorrhage and other maternal complications.

STUDY DESIGN

This was a prospective randomized controlled trial conducted at a tertiary university obstetric unit in Hong Kong. Pregnant women who were diagnosed to have placenta previa at 34 weeks (defined as lower placenta edge within 2 cm from the internal os) and required cesarean delivery were invited to participate. Eligible pregnant women were randomized into internal iliac artery balloon occlusion (Occlusion) group or standard management (Control) group. Those randomized to the Occlusion group had internal iliac artery balloon catheter placement performed before cesarean delivery and then balloon inflation after delivery of the baby. The primary outcome was the reduction of postpartum hemorrhage in those with internal iliac artery balloon occlusion. Secondary outcome measures included hemoglobin drop after delivery; amount of blood product transfusion; incidence of hysterectomy; maternal complications including renal failure, ischemic liver, disseminated intravascular coagulation, and adult respiratory distress syndrome; length of stay in hospital; admission to intensive care unit; and maternal death.

RESULTS

Between May 2016 and September 2018, 40 women were randomized (20 in each group). Demographic and obstetric characteristics were similar between the 2 groups. In the Occlusion group, 3 women did not receive the scheduled procedure, as it was preceded by antepartum hemorrhage that required emergency cesarean delivery, and 1 woman had repeated scan at 36 weeks showing the placental edge was slightly more than 2 cm from the internal os. Intention-to-treat analysis found no significant differences between the Occlusion and the Control groups regarding to the median intraoperative blood loss (1451 [1024-2388] mL vs 1454 [888-2300] mL; P = .945), the median length of surgery (49 [30-62] min vs 37 [30-51] min; P = .204), or the need for blood transfusion during operation (57.9% vs 50.0%; P = .621). None of the patients had rebleeding after operation, complication related to internal iliac artery procedure, or any other maternal complications. Reanalyzing the data using on-treatment approach showed the same results.

CONCLUSION

The use of prophylactic internal iliac artery balloon occlusion in placenta previa patients undergoing cesarean delivery did not reduce postpartum hemorrhage or have any effect on maternal or neonatal morbidity.

Can assessing the angle of progression before labor onset assist to predict vaginal birth after cesarean?: A prospective cohort observational study

Objective: To assess whether pre-labor measurement of the angle of progression (AOP) can assist in predicting a successful vaginal birth after cesarean in women without a previous vaginal birth.Methods: A prospective observational cohort study performed in a single tertiary center including women at term with a single previous cesarean delivery (CD), without prior vaginal births, who desire a trial of labor. Transperineal ultrasound was used to measure the AOP before the onset of labor. The managing staff in the delivery suite was blinded to the ultrasound measurements. Clinical data and delivery outcome were retrieved from medical records. The study was approved by the institutional ethics committee (KMC 0117-10).Results: Of the 111 women included in the study, 67 (60.4%) had a successful vaginal birth after CD. Women were sonographically assessed at a median of 3 days [interquartile range (IQR) 1-3 days] prior to delivery. The median AOP was significantly narrower in women who eventually underwent a CD than in those who delivered vaginally (88°, IQR 78-96° vs. 99°, IQR 89-107°, respectively; p < .001). An AOP >98° (derived from a receiver operating characteristic curve) was associated with a successful vaginal birth after CD in 87.5% of women. Multivariable regression analysis demonstrated that each additional 1° in the AOP increases the chance for a successful vaginal birth after CD by 6%.Conclusions: Pre-labor AOP may be a useful sonographic tool for predicting vaginal birth after CD and can assist in consulting primiparous women with a prior CD opting for a trial of labor.

Comparison of protease and aminopeptidase activities in meconium: A pilot study

The successive accumulation of proteases and aminopeptidases in meconium are important physiological components of the intrauterine environment in which a fetus develops. The aim of the present study was to assess the changes in the activities of these enzymes in meconium of healthy infants, and to investigate whether there were any statistically significant associations between activity of the enzymes of interest and the mode of delivery. The activities of proteases and aminopeptidases were determined in meconium portions (n=110) using the substrates BODIPY FL casein and L-leucine-7-amido-4-methylcoumarin hydrochloride, respectively. Serial meconium samples (2-5 per neonate) were collected from healthy infants born vaginally (n=14), and by a cesarean section (n=16). Protease activity (10⁴ RFU/h) was lower in the first meconium sample compared with the final sample from the same infant (3.99±2.03 vs. 5.76±2.24, respectively, mean ± standard deviation; P=0.004). Conversely, there was no significant difference in aminopeptidase activity (10³ nM/l/h) between consecutive meconium samples (P=0.702). The ratios of the first-meconium sample enzyme activity to the last-meconium sample enzyme activity were lower for proteases compared with aminopeptidases (0.76±0.48 vs. 1.35±1.04, respectively mean ± standard deviation; P=0.014), and sustained in the infants born by a cesarean section (P=0.008). Spearman's correlation coefficient analysis between the first and last meconium samples showed the correlation increased in the infants born vaginally compared with the rest of the infants (proteases, R=0.618 vs. R=0.314; aminopeptidases, R=0.688 vs. R=0.566). Aminopeptidase activity did not exhibit any notable dynamic changes during meconium accumulation in the fetal intestine. In infants born vaginally compared with those born by a cesarean section, the activity of both proteases and aminopeptidases in the first meconium sample showed an improved correlation with the activity of the final meconium sample. This may suggest that in the intrauterine environment, during accumulation of meconium in the digestive tract of the fetus, the activity and/or levels of these enzymes and the substrates they catalyze were more stable in newborns born vaginally compared with infants born by caesarean section.

Maternal and system characteristics, oxytocin administration practices, and cesarean birth rate

BACKGROUND

The cesarean birth rate in the United States is 32%, and there is discussion about the cause of high surgical birth rates. Our purpose was to determine whether mode of birth is influenced by maternal, nurse, and system factors.

METHODS

Secondary analysis of a data set of 163 women having postdates labor induction with oxytocin. Kaplan-Meier survival curves were calculated to compare the time for patients to reach an infusion rate of 6 mU/min, consistent with endogenous oxytocin levels in active labor. We used the log-rank test to evaluate survival curve differences. Multiple logistic regression and Cox proportional hazards models were conducted and included covariates that had statistically significant bivariate relationships with the time variable, or were clinically meaningful.

RESULTS

The mean time to reach 6 mU/min was longer for women who birthed by cesarean (172.5 minutes) than for women who had vaginal birth (125.0 minutes, P = .024). The mean time to reach 6 mU/min was also longer for women admitted on night shift (147.0 minutes) than day shift (110.2 minutes, P = .018). No maternal characteristics were significantly related to the time to reach a rate of 6 mU/min.

CONCLUSIONS

Even during the initial hours of labor induction, it is important that the oxytocin infusion is titrated appropriately to aid women in achieving timely vaginal birth. Intrapartum nurses should receive education about the pharmacokinetics of intravenous oxytocin to understand proper administration of this high-alert medication.

Comparison of Analgesic Effect Between Erector Spinae Plane Block and Transversus Abdominis Plane Block After Elective Cesarean Section: A Prospective Randomized Single-Blind Controlled Study

Background

This study compared the analgesic efficacy of a bilateral erector spinae plane (ESP) block with that of a bilateral transversus abdominis plane (TAP) block after elective cesarean delivery.

Methods

Sixty mothers scheduled for elective cesarean delivery under spinal anesthesia were randomly allocated to receive either ESP block or TAP block. The ESP group received ESP block at the level of the ninth thoracic transverse process with 20 mL of 0.25% bupivacaine at the end of surgery. The TAP group received an ultrasound-guided TAP block with 20 mL of 0.25% bupivacaine on completion of delivery. The primary outcome was the duration of analgesia achieved by each block. Secondary outcome measures were the postoperative pain severity, total tramadol consumption, patient satisfaction.

Results

The median (interquartile range) duration of block was longer in the ESP group than in the TAP group (12 hours [10, 14] vs 8 hours [8, 8], p<0.0001). In the first 24 hours, the mean visual analog pain score at rest was lower by 0.32 units in the ESP group. The median tramadol consumption in the first 24 hours was significantly higher in the TAP group than in the ESP group (125 mg [100, 150] vs 100 mg [75, 100, p=0.003]).

Conclusion

Compared with the TAP block, the ESP block provides more effective pain relief, has a longer duration of analgesic action, prolongs time to first analgesic requirement, is associated with less tramadol consumption, and can be used in multimodal analgesia and opioid-sparing regimens after cesarean section.

Safety and efficacy of sildenafil citrate to reduce operative birth for intrapartum fetal compromise at term: a phase 2 randomized controlled trial

BACKGROUND AND OBJECTIVE

Sildenafil citrate is a vasodilator used in erectile dysfunction and pulmonary hypertension. We tested whether it reduces emergency operative births for fetal compromise and improves fetal or uteroplacental perfusion in labor in a phase 2 double-blind randomized controlled trial.

STUDY DESIGN

Women at term in early labor or undergoing scheduled induction of labor at Mater Mother's Hospital, Brisbane, Australia, were randomly allocated 50 mg of sildenafil citrate orally 8 hourly up to 150 mg or placebo. Intrapartum fetal monitoring followed Royal Australian and New Zealand College of Obstetricians and Gynaecologists guidelines. Primary outcomes were (1) emergency operative birth (by cesarean delivery or instrumental vaginal birth) for intrapartum fetal compromise and (2) mean indices of fetal and uteroplacental perfusion using Doppler ultrasound. Analysis was by intention-to-treat.

TRIAL REGISTRATION NUMBER

ANZCTRN12615000319572 RESULTS: Between September 2015 and January 2019, 300 women were randomized equally to sildenafil citrate or placebo. Sildenafil citrate reduced the risk of emergency operative birth by 51% (18% vs 36.7%; relative risk, 0.49, 95% confidence interval, 0.33-0.73, P=.0004, number needed to treat = 5 [3-11]). There was no difference in indices of fetal and uteroplacental perfusion, but these were ascertained in only 71 women. Sildenafil citrate reduced the risk of meconium-stained liquor or pathologic fetal heart rate patterns by 43% (25.3% vs 44.7%; relative risk, 0.57, 95% confidence interval, 0.41-0.79, P=.0005), but its effects on fetal scalp sampling rates (2.0% vs 6.7%; relative risk, 0.30, 95% confidence interval, 0.08-1.07, P=.06) and adverse neonatal outcome (20.7% vs 21.3%; relative risk, 0.97, 95% confidence interval, 0.62-1.50, P=.89) were inconclusive. Only 3.6% of maternal levels of sildenafil citrate or its metabolite were detected in cord blood. No differences in maternal adverse events were seen.

CONCLUSION

Sildenafil citrate reduced operative birth for intrapartum fetal compromise, but much larger phase 3 trials of its effects on mother and child are needed before it can be routinely recommended.

A randomized trial of the bactericidal effects of chlorhexidine vs povidone-iodine vaginal preparation

BACKGROUND

Precesarean vaginal preparation significantly reduces postpartum infections. Although povidone-iodine is the most commonly used vaginal antiseptic, evidence suggests that chlorhexidine gluconate may be more effective.

OBJECTIVE

We aimed to compare the bactericidal effect of chlorhexidine gluconate and povidone-iodine on vaginal bacterial colony counts in pregnancy.

MATERIALS AND METHODS

We conducted a prospective randomized controlled trial of vaginal preparation with 0.5% chlorhexidine gluconate vs 10% povidone-iodine vs saline in women undergoing cesarean delivery at ≥34 weeks' gestation. Women in labor or those with ruptured membranes, chorioamnionitis, abnormal placentation, or allergy to study agents were excluded. Vaginal specimens were collected aseptically in the operating room immediately before and 5-10 minutes after vaginal cleansing with 3 sterile sponge sticks. Our primary outcome was postintervention aerobic and anaerobic bacterial colony counts, assessed by blinded investigators. Two-way analysis of variance with simple-effects analysis and Tukey post hoc test were used for multiple group comparisons. Secondary outcomes included baseline colony counts, change in colony counts, adverse events, and maternal infections.

RESULTS

A total of 29 women consented and underwent vaginal preparation with chlorhexidine gluconate (n=10), povidone-iodine (n=9), or saline (n=10). Groups were similar with respect to maternal age, body mass index, race, ethnicity, parity, group B streptococcus status, and gestational age. There were no differences in baseline colony counts. Vaginal preparation with povidone-iodine resulted in lower aerobic and anaerobic colony counts compared with chlorhexidine gluconate and saline (P≤.01 and P≤.0001, respectively). Povidone-iodine eliminated more than 99.9% of bacteria, whereas chlorhexidine gluconate and saline eliminated more than 99% and 95% of bacteria, respectively. Although all agents decreased aerobic and anaerobic bacterial counts, 0.5% chlorhexidine gluconate was no more effective than saline in reducing anaerobic bacteria. There were no reported adverse effects or postpartum infections.

CONCLUSION

Compared with 0.5% chlorhexidine gluconate, 10% povidone-iodine was more effective in reducing vaginal bacterial colony counts before cesarean delivery.

Risk of adverse pregnancy outcomes of late- and postterm pregnancies in advanced maternal age: A national cohort study

Introduction

There is an increase in women delivering ≥35 years of age. We analyzed the association between advanced maternal age and pregnancy outcomes in late‐ and postterm pregnancies.

Material and methods

A national cohort study was performed on obstetrical low‐risk women using data from the Netherlands Perinatal Registry from 1999 to 2010. We included women ≥18 years of age with a singleton pregnancy at term. Women with a pregnancy complicated by congenital anomalies, hypertensive disorders or diabetes mellitus were excluded. Composite adverse perinatal outcome was defined as stillbirth, neonatal death, meconium aspiration syndrome, 5‐minute Apgar score <7, neonatal intensive care unit admittance and sepsis. Composite adverse maternal outcome was defined as maternal death, placental abruption and postpartum hemorrhage of >1000 mL.

Results

We stratified the women into three age groups: 18‐34 (n = 1 321 366 [reference]); 35‐39 (n = 286 717) and ≥40 (n = 40 909). Composite adverse perinatal outcome occurred in 1.6% in women aged 18‐34, 1.7% in women aged 35‐39 (relative risk [RR] 1.06, 95% confidence interval [95% CI] 1.03‐1.08) and 2.2% in women aged ≥40 (RR 1.38, 95% CI 1.29‐1.47), with 5‐minute Apgar score <7 as the factor contributing most to the outcome. Composite adverse maternal outcome occurred in 4.6% in women aged 18‐34, 5.0% in women aged 35‐39 (RR 1.08, 95% CI 1.06‐1.10) and 5.2% in women aged ≥40 (RR 1.14, 95% CI 1.09‐1.19), with postpartum hemorrhage >1000 mL as the factor contributing most to the outcome. In all age categories, the risk of adverse pregnancy outcomes was higher for nulliparous than for multiparous women. The risk of adverse outcomes increased in both nulliparous and parous women with advancing gestational age. When adjusted for parity, onset of labor and gestational age, advanced maternal age is associated with an increase in both composite adverse perinatal and maternal outcomes.

Conclusions

The risk of adverse pregnancy outcome increases with advancing maternal age. Women aged ≥40 have an increased risk of adverse perinatal and maternal outcome when pregnancy goes beyond 41 weeks.

Analgesic Efficacy of Erector Spinae Plane Block Compared with Intrathecal Morphine After Elective Cesarean Section: A Prospective Randomized Controlled Study

Background

We aimed to assess the efficacy of ultrasound-guided bilateral erector spinae plane block (ESPB) compared to intrathecal morphine (ITM) for analgesia after elective cesarean delivery under spinal anesthesia.

Methods

In total, 140 parturients scheduled for elective cesarean section under spinal anesthesia were randomly allocated into two equal groups. The ESPB-group received 10 mg hyperbaric bupivacaine intrathecally through spinal anesthesia, followed by an ESPB at the ninth thoracic transverse process with 20 mL of 0.5% bupivacaine immediately after the operation. The ITM-group received 10 mg hyperbaric bupivacaine with 100 mcg morphine intrathecally through spinal anesthesia, followed by a sham block at the end of the surgery. The visual analogue scale (VAS) score for pain at several postoperative time points, total opioid consumption, and time to the first analgesic request were evaluated. Statistical analysis was performed with the independent t-test and linear mixed-effects models. The Kaplan–Meier estimator and the log-rank test were used to compare the primary and secondary outcomes of the groups.

Results

No significant differences were observed between the groups regarding patient characteristics; in the post-operative period (0–24 hrs), VAS scores (at rest) were, on average, 0.25 units higher in the ITM group. The total tramadol consumption in the first 24 hrs was significantly higher in the ITM group than in the ESPB group (101.71 ± 25.67 mg vs 44 ± 16.71 mg, respectively). The time to the first analgesic request was 4.93±0.82 hrs in the ITM group and 12±2.81 hrs in the ESPB group. Patient satisfaction did not differ significantly.

Conclusion

ESPB has a successful postoperative analgesic effect and may limit opioid consumption in parturients undergoing elective caesarean delivery.

The effect of a scheduled regimen of acetaminophen and ibuprofen on opioid use following cesarean delivery

Objective The primary objective was to evaluate if the administration of ibuprofen and acetaminophen at regularly scheduled intervals impacts pain scores and total opioid consumption, when compared to administration based on patient demand. Methods A retrospective chart review was performed comparing scheduled vs. as-needed acetaminophen and ibuprofen regimens, with 100 women included in each arm. Demographics and delivery characteristics were collected in addition to pain scores and total ibuprofen, acetaminophen and oxycodone use at 24, 48 and 72 h postoperatively. Results The scheduled dosing group was found to have a statistically significant decrease in pain scores at all time intervals. Acetaminophen and ibuprofen usage were also noted to be higher in this group while narcotic use was reduced by 64%. Conclusion Scheduled dosing of non-narcotic pain medications can substantially decrease opioid usage after cesarean delivery and improve post-operative pain.

Randomized Controlled Simulation Trial to Compare Transfer Procedures for Emergency Cesarean

OBJECTIVE

To test the hypothesis that capping intravenous and epidural lines would reduce time to transfer women in labor to the operating room and time to readiness for general anesthesia for emergency cesarean. The secondary purpose was to identify latent threats to patient safety.

DESIGN

Mixed methods analysis of a randomized, controlled, in situ simulation trial.

SETTING

Labor and delivery unit at high-risk referral center.

PARTICIPANTS

Fifteen interprofessional teams that included labor and delivery nurses and anesthesiology residents.

METHODS

Immediately before simulation, we randomized bedside nurses and anesthesiology residents to one of two groups: usual transfer or the cap and run procedure. Simulation scenarios started with fetal heart rate decelerations that necessitated position changes followed by emergency cesarean. An embedded simulated obstetrician announced the decision for cesarean; completion of an OR checklist confirmed team readiness to induce general anesthesia. Postsimulation debriefing was focused on teamwork and opportunities to improve safety, and we used qualitative analysis to synthesize results.

RESULTS

We found no statistically significant difference in the overall time from decision for cesarean to readiness for general anesthesia between the two groups (usual transfer median = 445 seconds [interquartile range, 425-465] vs. cap and run 390 seconds [interquartile range, 383-443], p = .12). The time in the operating room was less in the cap and run group than in the usual transfer group (median = 300 seconds vs. 250 seconds, p = .038). Qualitative analysis of the debriefing data indicated advantages of the capping procedure, including better bed maneuverability and fewer tangled lines.

CONCLUSION

We found no evidence of decreased overall time from decision for cesarean to readiness for general anesthesia based on whether the nurse capped the intravenous and epidural lines or pushed the intravenous pole alongside the bed. However, nurses perceived improved patient safety with the cap and run procedure.

Does Birth Trigger Cell Death in the Developing Brain?

Developmental cell death eliminates half of the neurons initially generated in the mammalian brain, and occurs perinatally in many species. It is possible that the timing of neuronal cell death is developmentally programmed, and only coincidentally associated with birth. Alternatively, birth may play a role in shaping cell death. To test these competing hypotheses, we experimentally advanced or delayed birth by 1 d in mice (within the normal range of gestation for the species) and examined effects on the temporal pattern and magnitude (amount) of neuronal cell death, using immunohistochemical detection of activated caspase-3 as a cell death marker. In order to detect effects of subtle changes in birth timing, we focused on brain areas that exhibit sharp postnatal peaks in cell death. We find that advancing birth advances peak cell death, supporting the hypothesis that birth triggers cell death. However, a delay of birth does not delay cell death. Thus, birth can advance cell death, but if postponed, a developmental program governs. Advancing or delaying birth also caused region-specific changes in the overall magnitude of cell death. Our findings shed light on the long-standing question of what controls the timing and magnitude of developmental neuronal cell death, and position birth as an orchestrator of brain development. Because humans across the world now routinely alter birth timing, these findings may have implications for current obstetric practices.

Potential Impact of Guidelines for the Prevention of Cesarean Deliveries in a Contemporary Canadian Population

OBJECTIVE

This study sought to describe how the implementation of recent labour guidelines may affect the cesarean delivery rate in a population in Alberta.

METHODS

This retrospective study was conducted on primiparous women who were in labour with singleton term fetuses with cephalic presentation in Alberta from 2007 to 2016 (n = 181 738), and it used data from a perinatal database. Modelled cesarean delivery rates were calculated to determine the potential impact of the recent guidelines on the cesarean delivery rate by using the percentage of cesarean deliveries that occurred outside the threshold of the recent labour guidelines.

RESULTS

A total of 21.7% of the cesarean deliveries for dystocia occurred outside of the guidelines related to the first stage of labour arrest for spontaneous labour (n = 9282), and 45.4% occurred outside of the guidelines related to the first stage of labour arrest for induced labours (n = 11 712). A total of 69.0% of the cesarean deliveries for dystocia occurred outside of the failed induction of labour guidelines (n = 4921), and 55.4% occurred outside of the second stage labour arrest guidelines (n = 6632). Assuming that the labour arrest guidelines are effective at reducing the cesarean delivery rate 25% of the time, the cesarean delivery rate for primiparous women in labour would be reduced from 22.5% to 20.7%. Assuming a 75% adherence/effectiveness rate, the cesarean delivery rate would be reduced to 17.1%.

CONCLUSION

The recent labour guidelines have the potential to have a substantial impact on the intrapartum cesarean delivery rate in primiparous women with singleton fetuses with cephalic presentation at term if the guidelines are put into practice.