Primary cesarean delivery among parous women in the United States, 1990-2003

Preferences for childbirth delivery and pain relief methods among pregnant women in Vietnam

Background

Understanding childbirth delivery and pain relief method preferences is important as a part of the shared decision-making process between pregnant women and health professionals. This study aimed to examine the preferences for childbirth delivery modes and pain relief methods and factors related to these preferences among pregnant women in Vietnam.

Methods

A cross-sectional survey on pregnant women was conducted in two obstetrics hospitals in Vietnam. Face-to-face interviews using a structured questionnaire were performed to collect information about sociodemographic characteristics, pregnancy characteristics, preferences for different childbirth delivery modes, and pain relief methods. Multivariate logistic regression was employed for determining associated factors with the preferences.

Results

Of 576 pregnant women, 34% of participants preferred cesarean section. Most of the sample did not have any preferences for specific pharmacological pain relief methods (70.1%), while support from partner/relatives was the most preferable non-pharmacological method (61.3%), following by water birth (11.1%) and acupuncture (9.9%). Desire to have another baby, relatives' experience, selection date of birth, and instrumental social support were major drivers of the cesarean section selection. This preference was an important factor in the preference for pharmacological pain relief. Meanwhile, high levels of informational and emotional support were associated with non-pharmacological method preference.

Conclusion

This study highlighted a high preference rate for cesarean section in urban pregnant women in Vietnam. Holistic approaches from family, health facility, and policy should be performed to diminish the cesarean rate preference and promote the use of non-pharmacological pain relief methods during birth.

Attributable factors for the rising cesarean delivery rate over three decades: an observational cohort study

BACKGROUND

Cesarean delivery rates continue to rise globally the reasons for which are incompletely understood.

OBJECTIVES

We aimed to characterize attributable factors for increasing cesarean delivery rates over a 30-year period within our health network.

STUDY DESIGN

This was a planned observational cohort study across two hospitals (a large tertiary referral hospital and a metropolitan hospital) in Sydney, Australia using data from a previously published study. Two time periods were compared: 1989-1999 and 2009-2016, between which the cesarean delivery rate increased from 19% to 30%. Participants were all women who had a cesarean delivery after 24 weeks gestational age. Data were analyzed using multiple imputation and robust Poisson regression to calculate differences in the adjusted and unadjusted relative risk of cesarean delivery and estimate the changes in the cesarean delivery rate attributable to maternal and clinical factors. The primary outcome was cesarean delivery.

RESULTS

After 576 exclusions, 102 589 births were included in the analysis. Fifty-six percent of the increase in the rate of cesarean delivery was attributed to changes in the distribution of maternal age, body mass index, parity and history of previous cesarean delivery. An additional 10% of the increase was attributed to changes in the obstetric management of the following high-risk pregnancies: multiple gestation, malpresentation (mainly breech) and preterm singleton birth. When pre-labor cesarean deliveries for maternal choice, suspected fetal compromise, previous pregnancy issues and suspected large fetus were excluded, 78% of the increase was attributed to either maternal factors or changes in the obstetric management of these high-risk pregnancies.

CONCLUSIONS

Most of the steep rise in the cesarean delivery rate from 19% to 30% was attributed to changes in maternal demographic and clinical factors. This observation is relevant to developing preventative strategies which account for nulliparity, age, body mass index, and the management of high-risk pregnancies.

TWEETABLE ABSTRACT

More than half of the increase in the rate of cesarean delivery is attributable to changes in maternal age, BMI, parity and history of cesarean delivery.

Factors Associated with Unplanned Primary Cesarean Birth: Secondary Analysis of the Listening to Mothers in California Survey

BACKGROUND

In many countries, cesarean section has become the most common major surgical procedure. Most nations have high cesarean birth rates, suggesting overuse. Due to the excess harm and expense associated with unneeded cesareans, many health systems are seeking approaches to safe reduction of cesarean rates. Surveys of childbearing women are a distinctive and underutilized source of data for examining factors that may contribute to cesarean reduction.

METHODS

To identify factors associated with unplanned primary cesarean birth, we carried out a secondary analysis of the Listening to Mothers in California Survey, limited to the subgroup who had not had a previous cesarean birth and did not have a planned primary cesarean (n = 1,964). Participants were identified through birth certificate sampling and contacted initially by mail and then by telephone, text message and email, as available. Sampled women could participate in English or Spanish, on any device or with a telephone interviewer. Following bivariate demographic, knowledge and attitude, and labor management analyses, we carried out multivariable analyses to adjust with covariates and identify factors associated with unplanned primary cesarean birth.

RESULTS

Whereas knowledge, attitudes, preferences and behaviors of the survey participants were not associated with having an unplanned primary cesarean birth, their experience of pressure from a health professional to have a cesarean and a series of labor management practices were strongly associated with how they gave birth. These practices included attempted induction of labor, early hospital admission, and labor augmentation. Women's reports of pressure from a health professional to have a primary cesarean were strongly related to the likelihood of cesarean birth.

CONCLUSIONS

While women largely wish to avoid unneeded childbirth interventions, their knowledge, preferences and care arrangement practices did not appear to impact their likelihood of an unplanned primary cesarean birth. By contrast, a series of labor management practices and perceived health professional pressure to have a cesarean were associated with unplanned primary cesarean birth. Improving ways to engage childbearing women and implementing changes in labor management and communication practices may be needed to reduce unwarranted cesarean birth.

External Cephalic Version in Cases of Imminent Delivery at Preterm Gestational Ages: A Prospective Series

Objective  When delivery of a breech fetus is required at a preterm gestational age, Cesarean delivery is often recommended. We performed a prospective patient series to assess the success rate and safety of performing external cephalic version (ECV) procedures on preterm fetuses as an alternative to Cesarean delivery. Study Design  We performed a prospective clinical series of patients who required delivery with a malpresenting fetus at a preterm gestational age. Results  ECV procedures were successful in singletons 50% of the time. No significant complications or cases of fetal mortality were documented. Conclusion  ECV at preterm gestational ages may be an appropriate approach to management in patients requiring delivery. Larger series are needed to further document success rates and risks of the procedure.

Primary and Repeat Cesarean Deliveries: A Population-based Study in the United States, 1979-2010

BACKGROUND

Despite the temporal increase in cesarean deliveries, the extent to which maternal age, period, and maternal birth cohorts may have contributed to these trends remains unknown.

METHODS

We performed an analysis of 123 million singleton deliveries in the United States (1979-2010). We estimated rate ratio (RR) with 95% confidence interval (CI) for primary and repeat cesarean deliveries. We examined changes in cesarean rates with weighted Poisson regression models across three time-scales: maternal age, year of delivery, and birth cohort (mother's birth year).

RESULTS

The primary cesarean rate increased by 68% (95% confidence interval [CI]: 67%, 69%) between 1979 (11.0%) and 2010 (18.5%). Repeat cesarean deliveries increased by 178% (95% CI: 176, 179) from 5.2% in 1979 to 14.4% in 2010. Cesarean rates increased with advancing age. Compared with 1979, the RR for the period effect in primary and repeat cesarean deliveries increased up to 1990, fell to a nadir at 1993, and began to rise thereafter. A small birth cohort effect was evident, with women born before 1950 at increased risk of primary cesarean; no cohort effect was seen for repeat cesarean deliveries. Adjustment for maternal BMI had a small effect on these findings. Period effects in primary cesarean were explained by a combination of trends in obesity and chronic hypertension, as well as demographic shifts over time.

CONCLUSIONS

Maternal age and period appear to have important contributions to the temporal increase in the cesarean rates, although the effect of parity on these associations remains undetermined.

Early versus Late Admission to Labor Affects Labor Progression and Risk of Cesarean Section in Nulliparous Women

Background

Rates of cesarean section increase worldwide, and the components of this increase are partially unknown. A strong role is prescribed to dystocia, and at the same time, the diagnosis of dystocia is highly subjective. Previous studies indicated that risk of cesarean is higher when women are admitted to the hospital early in the labor.

Methods

We examined data on 1,202 nulliparous women with singleton, vertex pregnancies and spontaneous labor onset. We selected three groups based on cervical dilatation at admission: early (0.5–1.5 cm, N = 178), intermediate (2.5–3.5 cm, N = 320), and late (4.5–5.5 cm, N = 175). The Kaplan–Meier estimator was used to analyze the risk of delivery by cesarean section at a given dilatation, and thin-plate spline regression with a binary outcome (R library gam) to assess the form of the associations between the cesarean section in either the first or second stage versus vaginal delivery and dilatation at admission.

Results

Women who were admitted to labor early had a higher risk of delivery by cesarean section (18 versus 4% in the late admission group), while the risk of instrumental delivery did not differ (24 versus 24%). Before 4 cm dilatation, the earlier a woman was admitted to labor, the higher was her risk of delivery by cesarean section. After 4 cm dilatation, however, the relationship disappeared. These patterns were true for both first and second stage cesarean deliveries. Oxytocin use was associated with a higher risk of cesarean section only in the middle group (2.5–3.5 cm dilatation at admission).

Conclusion

Early admission to labor was associated with a significantly higher risk of delivery by cesarean section during the first and second stages. Differential effects of oxytocin augmentation depending on dilation at admission may suggest that admission at the early stage of labor is an indicator rather than a risk factor itself, but admission at the intermediate stage (2.5–3.5 cm) becomes a risk factor itself. Further research is needed to study this hypothesis.

Prepregnancy Obesity and Primary Cesareans among Otherwise Low-Risk Mothers in 38 U.S. States in 2012

BACKGROUND

The United States has recently experienced increases in both its rate of obesity and its cesarean rate. Our objective was to use a new item measuring prepregnancy body mass index (BMI) on the U.S. Standard Certificate of Live Birth to examine at a population level the relationship between maternal obesity and primary cesarean delivery for women at otherwise low risk for cesarean delivery.

METHODS

By 2012, 38 states with 86 percent of United States births had adopted the U.S. Standard Certificate. The sample was limited to the 2,233,144 women who had a singleton, vertex, term (37-41 weeks) birth in 2012 and no prior cesarean. We modeled the likelihood of a primary cesarean by BMI category, controlling for maternal socio-demographic and medical characteristics.

RESULTS

Overall, 46.4 percent of otherwise low-risk mothers had a prepregnancy BMI in the overweight (25.1%) or obese (21.3%) categories, with the obese category distributed as follows: obese I (BMI 30.0-34.9, 12.4%); obese II (BMI 35.0-39.9, 5.5%); and obese III (BMI 40+, 3.5%). Obesity rates were highest among American Indian and Alaska Native (32.5%) and non-Hispanic black mothers (30.5%). After adjustment for demographic and medical risks, the adjusted risk ratios (95% confidence intervals) of cesarean for low-risk primiparas were: 1.61 (1.60-1.63) for obese I, 1.86 (1.83-1.88) for obese II, and 2.21 (2.18-2.25) for obese III mothers compared with mothers in the normal weight category.

DISCUSSION

A relationship between prepregnancy obesity and primary cesarean delivery among relatively low-risk mothers remained even after controlling for social and medical risk factors.

The influence of detailed maternal ethnicity on cesarean delivery: findings from the U.S. birth certificate in the State of Massachusetts

BACKGROUND

Our objective was to examine the likelihood of primary cesarean delivery for women at low risk for the procedure in Massachusetts.

METHODS

Birth certificate data for all births from 1996 to 2010 that were nulliparous, term, singleton, and vertex (NTSV; N = 427,393) were used to conduct logistic regression models to assess the likelihood of a cesarean delivery for each of the 31 ethnic groups relative to self-identified "American" mothers. The results were compared with broad classifications of race/ethnicity more commonly employed in research.

RESULTS

While 23.3 percent of American women had primary cesarean deliveries, cesarean delivery rates varied from 12.9 percent for Cambodian to 32.4 percent for Nigerian women. Women from 21 of 30 ethnic groups had higher odds of a primary cesarean (range of adjusted odds ratios [AORs] 1.09-1.77), while only Chinese, Cambodian, and Japanese women had lower odds (range of AORs 0.66-0.92), compared with self-identified "Americans." Using broad race/ethnicity categories, Non-Hispanic black, Hispanic, and "Other" women had higher odds of cesarean delivery relative to Non-Hispanic white women (range of AORs 1.12-1.47), while there were no differences for Asian or Pacific Islander women.

CONCLUSIONS

Detailed maternal ethnicity explains the variation in NTSV cesarean delivery rates better than broad race/ethnicity categories. Different patterns of cesarean delivery between ethnic groups suggest cultural specificity related to birth culture.

Indwelling bladder catheterisation as part of intraoperative and postoperative care for caesarean section

BACKGROUND

Caesarean section (CS) is the most common obstetric surgical procedure, with more than one-third of pregnant women having lower-segment CS. Bladder evacuation is carried out as a preoperative procedure prior to CS. Emerging evidence suggests that omitting the use of urinary catheters during and after CS could reduce the associated increased risk of urinary tract infections (UTIs), catheter-associated pain/discomfort to the woman, and could lead to earlier ambulation and a shorter stay in hospital.

OBJECTIVES

To assess the effectiveness and safety of indwelling bladder catheterisation for intraoperative and postoperative care in women undergoing CS.

SEARCH METHODS

We searched the Cochrane Pregnancy and Childbirth Group's Trials Register (31 December 2013) and reference lists of retrieved studies.

SELECTION CRITERIA

Randomised controlled trials (RCTs) comparing indwelling bladder catheter versus no catheter or bladder drainage in women undergoing CS (planned or emergency), regardless of the type of anaesthesia used. Quasi-randomised trials, cluster-randomised trials were not eligible for inclusion. Studies presented as abstracts were eligible for inclusion providing there was sufficient information to assess the study design and outcomes.

DATA COLLECTION AND ANALYSIS

Two review authors independently assessed studies for eligibility and trial quality, and extracted data. Data were checked for accuracy.

MAIN RESULTS

The search retrieved 16 studies (from 17 reports). Ten studies were excluded and one study is awaiting assessment. We included five studies involving 1065 women (1090 recruited). The five included studies were at moderate risk of bias.Data relating to one of our primary outcomes (UTI) was reported in four studies but did not meet our definition of UTI (as prespecified in our protocol). The included studies did not report on our other primary outcome - intraoperative bladder injury (this outcome was not prespecified in our protocol). Two secondary outcomes were not reported in the included studies: need for postoperative analgesia and women's satisfaction. The included studies did provide limited data relating to this review's secondary outcomes. Indwelling bladder catheter versus no catheter - three studies (840 women) Indwelling bladder catheterisation was associated with a reduced incidence of bladder distension (non-prespecified outcome) at the end of the operation (risk ratio (RR) 0.02, 95% confidence interval (CI) 0.00 to 0.35; one study, 420 women) and fewer cases of retention of urine (RR 0.06, 95% CI 0.01 to 0.47; two studies, 420 women) or need for catheterisation (RR 0.03, 95% CI 0.01 to 0.16; three studies 840 participants). In contrast, indwelling bladder catheterisation was associated with a longer time to first voiding (mean difference (MD) 16.81 hours, 95% CI 16.32 to 17.30; one study, 420 women) and more pain or discomfort due to catheterisation (and/or at first voiding) (average RR 10.47, 95% CI 4.71 to 23.25, two studies, 420 women) although high levels of heterogeneity were observed. Similarly, compared to women in the 'no catheter' group, indwelling bladder catheterisation was associated with a longer time to ambulation (MD 4.34 hours, 95% CI 1.37 to 7.31, three studies, 840 women) and a longer stay in hospital (MD 0.62 days, 95% CI 0.15 to 1.10, three studies, 840 women). However, high levels of heterogeneity were observed for these two outcomes and the results should be interpreted with caution.There was no difference in postpartum haemorrhage (PPH) due to uterine atony. There was also no difference in the incidence of UTI (as defined by trialists) between the indwelling bladder catheterisation and no catheterisation groups (two studies, 570 women). However, high levels of heterogeneity were observed for this non-prespecified outcome and results should be considered in this context. Indwelling bladder catheter versus bladder drainage - two studies (225 women)Two studies (225 women) compared the use of an indwelling bladder catheter versus bladder drainage. There was no difference between groups in terms of retention of urine following CS, length of hospital stay or the non-prespecified outcome of UTI (as defined by the trialist).There is some evidence (from one small study involving 50 women), that the need for catheterisation was reduced in the group of women with an indwelling bladder catheter (RR 0.04, 95% CI 0.00 to 0.70) compared to women in the bladder drainage group. Evidence from another small study (involving 175 women) suggests that women who had an indwelling bladder catheter had a longer time to ambulation (MD 0.90, 95% CI 0.25 to 1.55) compared to women who received bladder drainage.

AUTHORS' CONCLUSIONS

This review includes limited evidence from five RCTs of moderate quality. The review's primary outcomes (bladder injury during operation and UTI), were either not reported or reported in a way not suitable for our analysis. The evidence in this review is based on some secondary outcomes, with heterogeneity present in some of the analyses. There is insufficient evidence to assess the routine use of indwelling bladder catheters in women undergoing CS. There is a need for more rigorous RCTs, with adequate sample sizes, standardised criteria for the diagnosis of UTI and other common outcomes.

Similar adverse pregnancy outcome in native and nonnative dutch women with pregestational type 2 diabetes: a multicentre retrospective study

Objective. To assess the incidence of adverse pregnancy outcome in native and nonnative Dutch women with pregestational type 2 diabetes (T2D) in a multicenter study in The Netherlands. Methods. Maternal characteristics and pregnancy outcome were retrospectively reviewed and the influence of ethnicity on outcome was evaluated using independent t-test, Mann-Whitney U-test, and chi-square test. Results. 272 pregnant women (80 native and 192 non-native Dutch) with pregestational T2D were included. Overall outcome was unfavourable, with a perinatal mortality of 4.8%, major congenital malformations of 6.3%, preeclampsia of 11%, preterm birth of 19%, birth weight >90th percentile of 32%, and a Caesarean section rate of 42%. In nonnative Dutch women, the glycemic control was slightly poorer and the gestational age at booking somewhat later as compared to native Dutch women. However, there were no differences in incidence of preeclampsia/HELLP, preterm birth, perinatal mortality, macrosomia, and congenital malformations between those two groups. Conclusions. A high incidence of adverse pregnancy outcomes was found in women with pregestational T2D, although the outcome was comparable between native and non-native Dutch women. This suggests that easy access to and adequate participation in the local health care systems contribute to these comparable outcomes, offsetting potential disadvantages in the non-native group.

Racial and ethnic differences in primary, unscheduled cesarean deliveries among low-risk primiparous women at an academic medical center: a retrospective cohort study

Background

Cesarean sections are the most common surgical procedure for women in the United States. Of the over 4 million births a year, one in three are now delivered in this manner and the risk adjusted prevalence rates appear to vary by race and ethnicity. However, data from individual studies provides limited or contradictory information on race and ethnicity as an independent predictor of delivery mode, precluding accurate generalizations. This study sought to assess the extent to which primary, unscheduled cesarean deliveries and their indications vary by race/ethnicity in one academic medical center.

Methods

A retrospective, cross-sectional cohort study was conducted of 4,483 nulliparous women with term, singleton, and vertex presentation deliveries at a major academic medical center between 2006–2011. Cases with medical conditions, risk factors, or pregnancy complications that can contribute to increased cesarean risk or contraindicate vaginal birth were excluded. Multinomial logistic regression analysis was used to evaluate differences in delivery mode and caesarean indications among racial and ethnic groups.

Results

The overall rate of cesarean delivery in our cohort was 16.7%. Compared to White women, Black and Asian women had higher rates of cesarean delivery than spontaneous vaginal delivery, (adjusted odds ratio {AOR}: 1.43; 95% CI: 1.07, 1.91, and AOR: 1.49; 95% CI: 1.02, 2.17, respectively). Black women were also more likely, compared to White women, to undergo cesarean for fetal distress and indications diagnosed in the first stage as compared to the second stage of labor.

Conclusions

Racial and ethnic differences in delivery mode and indications for cesareans exist among low-risk nulliparas at our institution. These differences may be best explained by examining the variation in clinical decisions that indicate fetal distress and failure to progress at the hospital-level.

Regional variation in caesarean deliveries in Germany and its causes

BACKGROUND

Determinants of regional variation in caesarean sections can contribute explanations for the observed overall increasing trend of caesarean sections. We assessed which mechanism explains the higher rate of caesarean sections in the former West than East Germany: a more liberal use of caesarean sections in the case of relative indications or more common caesarean sections without indications.

METHODS

We used a health insurance database from all regions of Germany with approximately 14 million insured individuals (about 17% of the total population in Germany). We selected women who gave birth in the years 2004 to 2006 and identified indications for caesarean section on the basis of hospital diagnoses in 30 days around birth. We classified pregnancies into three groups: those with strong indications for caesarean section (based on classification of absolute indications recommended by the Unmet Obstetrics Need network), those with moderate indications (other indications increasing the probability of caesarean section) and those with no indications. We investigated the percentage of caesarean sections among all births, presence of strong or moderate indications in all pregnancies, the probability of caesarean sections in the presence of indications and the fraction of caesarean sections attributable to strong, moderate and no indications.

RESULTS

In total, 294,841 births from 2004-2006 were included in the analysis. In the former West Germany, 30% births occurred by caesarean section, while in the former East Germany the caesarean section rate was 22%. Proportions of pregnancies with strong and moderate indications for caesarean section were similar in both regions. For strong indications the probability of caesarean section was similar in East and West Germany, but the probability of caesarean section among women with moderate indications was substantially higher in the former West Germany. Caesarean sections were also more common among women with no indications in the former West (8%) than in the former East (4-5%). The higher probability of caesarean section in the case of strong or moderate indications in the former West than in the East explained 87% of the difference between section rates in these two regions, while caesarean sections without indications contributed to only 13% of the difference observed.

CONCLUSIONS

The observed difference between caesarean section rates in the former East and West Germany was most likely due to different medical practice in handling relative indications.

Caesarean delivery in south-western Iran: trends and determinants in a community-based survey

OBJECTIVE

To assess trends in caesarean delivery and its associated factors in south-western Iran.

SUBJECTS AND METHODS

This cross-sectional study was conducted from January 2007 to January 2010 in Fars province, Iran. All deliveries recorded in public and private hospitals were included. The Mann-Whitney U test, χ2 test and multivariate logistic regression models were used for analysis of data. A p value less than 0.05 was considered significant.

RESULTS

The rate of caesarean section for the whole sample of 139,159 increased from 51.6% in 2007 to 53.3% in 2009, which was statistically and clinically significant. The rate of caesarean delivery was significantly higher in primiparous compared to multiparous mothers. The rate increased steadily with the mother's age. The most prevalent recorded reason for caesarean delivery was maternal request. Logistic regression analysis showed that maternal age, previous abortions, underlying maternal disease, gestational age and number of living children were key contributing factors to the choice of mode of delivery.

CONCLUSION

This study showed an increasing rate of caesarean delivery which should draw the attention of policymakers to factors associated with this mode of delivery.

Racial/ethnic disparities in maternal morbidities: a statewide study of labor and delivery hospitalizations in Wisconsin

We examined racial/ethnic disparities in maternal morbidities (MM) and the number of MM during labor and delivery among hospital discharges in Wisconsin. We conducted a retrospective cohort study of hospital discharge data for 206,428 pregnant women aged 13-53 years using 2005-2007 Healthcare Cost and Utilization Project State Inpatient Dataset (HCUP-SID) for Wisconsin. After adjustments for covariates, MM (preterm labor, antepartum and postpartum hemorrhage, hypertension in pregnancy, gestational diabetes, membrane-related disorders, infections and 3rd and 4th perineal lacerations) were examined using logistic regression models, and number of MM (0, 1, 2, >2 MM) were examined using multivariable ordered logistic regressions with partial proportional odds models. African-Americans had significantly higher likelihood of infections (OR = 1.74; 95% CI 1.60-1.89), preterm labor (OR = 1.42; 1.33-1.50), antepartum hemorrhage (OR = 1.63; 1.44-1.83), and hypertension complicating pregnancy (OR = 1.39; 1.31-1.48) compared to Whites. Hispanics, Asian/Pacific Islanders, and Native Americans had significantly higher likelihood of infections, postpartum hemorrhage, and gestational diabetes than Whites. Major perineal lacerations were significantly higher among Asian/Pacific Islanders (OR = 1.53; 1.34-1.75). All minority racial/ethnic groups, except Asians, had significantly higher likelihood of having 0 versus 1, 2 or >2 MM, 0 or 1 versus 2 or >2 MM, and 0, 1 or 2 versus >2 MM than white women. Findings show significant racial/ethnic disparities in MM, and suggest the need for better screening, management, and timely referral of these conditions, particularly among racial/ethnic women. Disparities in MM may be contributing to the high infant mortality and adverse birth outcomes among different racial/ethnic groups in Wisconsin.

Comparative analysis of cesarean delivery rates over a 10-year period in a single Institution using 10-class classification

OBJECTIVE

To evaluate the variables associated with changes in cesarean delivery (CD) rates in a University Hospital with standardized and unchanged protocols of care.

METHODS

Retrospective analysis of consecutive deliveries between two triennia 10 years apart. The Robson classification of CD was used, and the analysis focused on factors affecting Robson's classes 1 and 2 combined (term singleton cephalic nulliparae) and class 5 (previous CD).

RESULTS

A total of 8237 deliveries occurred in the 1st period, and 8420 in the 2nd. CD increased from 12.5 to 18% (p < 0.001). Robson's classes 1 and 2 combined contributed more than other classes to CD rates (32 vs 36%; p < 0.001). At multivariate analysis, BMI (Odds ratio [OR]: 1.08; 95% CI: 1.06-1.1) and maternal age (OR: 1.06; 95% CI: 1.05-1.08) were independently related to CD. In Robson class 5, the rate of CD increased from 34 to 46%, p < 0.001, mostly due to an increase in elective CD (39 vs 67.5%; p < 0.001). At multivariate analysis, BMI (OR: 1.06 95% CI: 1.02-1.1) and more than one previous CD (OR: 18.7; 95% CI: 9.6-36.4) were independently related to CD.

CONCLUSIONS

BMI and maternal age are independent factors associated to the increasing rate of CD in nulliparae with spontaneous or induced labor at term. In women with previous CD, BMI and more than one previous CD are factors associated with the increasing rate of CD.

Trends in cesarean delivery at preterm gestation and association with perinatal mortality

OBJECTIVE

We sought to examine the extent to which a temporal increase in preterm cesarean delivery is associated with gestational age-specific changes in perinatal survival in preterm gestations.

STUDY DESIGN

We utilized data on singleton births in the United States (1990 through 2004) delivered between 24-36 weeks' gestation. Associations between changes in cesarean delivery at preterm gestations and trends in the risk of preterm stillbirth, and neonatal and perinatal mortality were estimated before and after adjustments for a variety of potential confounders.

RESULTS

From 1990 through 2004, cesarean delivery rates increased by 50.6%, 40.7%, and 35.8% at 24-27, 28-33, and 34-36 weeks, respectively. The largest incremental effect of cesarean was associated with a reduction in stillbirths by 5.8%, 14.2%, and 23.1% at 24-27, 28-33, and 34-36 weeks, respectively, leading to an 11.4%, 4.9%, and 0.6% reduction in perinatal deaths at 24-27, 28-33, and 34-36 weeks, respectively.

CONCLUSION

Increasing rates of preterm cesarean were associated with improved perinatal survival. This association was evident largely because of dramatic incremental declines in stillbirths.

Effect of prior cesarean delivery on neonatal outcomes

AIMS

To examine the effect of a prior cesarean delivery on neonatal outcomes.

METHODS

We conducted a retrospective cohort study on all women with a prior livebirth who delivered at the Royal Victoria Hospital between 2001 and 2006. We defined our exposure as a positive history for cesarean delivery and used unconditional logistic regression analysis to estimate the adjusted effect of a previous cesarean delivery on adverse neonatal outcomes.

RESULTS

A total of 18,673 births took place of which 9708 were in women with a prior livebirth (77.0% with no previous cesarean delivery and 23.0% with a previous cesarean delivery). As compared to newborns delivered by mothers with no prior cesarean delivery, increasing number of prior cesarean deliveries was associated with an increasing risk of preterm birth [odds ratio (OR) 1.23, 95% confidence interval (CI) 1.09-1.39]; respiratory distress syndrome (OR 3.54, 95% CI 2.02-5.91); and admission to the neonatal intensive care unit (OR 1.41, 95% CI 1.25-1.60). These findings were predominantly due to differences in gestational age and mode of delivery.

CONCLUSION

Having a prior cesarean delivery is associated with an increased risk of adverse neonatal outcomes. Adverse neonatal outcomes in subsequent pregnancies is additional evidence to suggest that unless specifically indicated, cesarean delivery should be avoided.

Single- versus double-layer hysterotomy closure at primary caesarean delivery and bladder adhesions

OBJECTIVE

To determine the association between single-layer (one running suture) and double-layer (second layer or imbricating suture) hysterotomy closure at primary caesarean delivery and subsequent adhesion formation.

DESIGN

A secondary analysis from a prospective cohort study of women undergoing first repeat caesarean section.

SETTING

Department of Obstetrics and Gynecology, Stanford University, Stanford, CA, USA.

POPULATION

One hundred and twenty-seven pregnant women undergoing first repeat caesarean section.

METHODS

Patient records were reviewed to identify whether primary caesarean hysterotomies were closed with a single or double layer. Data were analysed by Fisher's exact tests and multivariable logistic regression.

MAIN OUTCOME MEASURE

Prevalence rate of pelvic and abdominal adhesions.

RESULTS

Of the 127 women, primary hysterotomy closure was single layer in 56 and double layer in 71. Single-layer hysterotomy closure was associated with bladder adhesions at the time of repeat caesarean (24% versus 7%, P = 0.01). Single-layer closure was associated in this study with a seven-fold increase in the odds of developing bladder adhesions (odds ratio, 6.96; 95% confidence interval, 1.72-28.1), regardless of other surgical techniques, previous labour, infection and age over 35 years. There was no association between single-layer closure and other pelvic or abdominal adhesions.

CONCLUSIONS

Primary single-layer hysterotomy closure may be associated with more frequent bladder adhesions during repeat caesarean deliveries. The severity and clinical implications of these adhesions should be assessed in large prospective trials.

Role of pelvic sensory signaling during delivery in postpartum mental health

BACKGROUND: Animal research demonstrates that pelvic sensory signaling at parturition initiates behavioral and emotional changes that are protective for mother and offspring. In contrast, research with humans has found no effect of cesarean delivery (i.e., procedure that blocks pelvic signaling) on mother's mental health. The lack of effect may reflect little consideration for the use of epidurals, another intervention that blocks pelvic signaling. The following study examines whether blocking pelvic signaling during delivery predicts postpartum depression symptomatology. METHOD: Longitudinal mental health data were collected prospectively from 142 primiparous women who had a cesarean delivery and/or received epidural anesthesia (Intervention) or delivered vaginally without anesthesia (No-Intervention). Measurements began in late pregnancy and continued through the first postpartum year. RESULTS: Intervention mothers reported more depressive symptoms at the end of the first postpartum year compared to those in the No-Intervention group. This effect was independent of socio-cultural factors known to predict levels of depressive symptoms. CONCLUSION: These results suggest that pelvic sensory signaling may help to prepare women for the postpartum period. Considering there are many factors influencing the mental health of mothers, the present finding suggest that populations vulnerable to postpartum depression should consider a delivery without intervention, when medically permissible.

Racial and ethnic disparities in the trends in primary cesarean delivery based on indications

OBJECTIVE

To examine trends in primary cesarean deliveries by indications and race/ethnicity.

STUDY DESIGN

We examined temporal trends in primary cesarean deliveries from 1991 through 2008 among singleton births (n = 540,953) in Kaiser Permanente Southern California hospitals using information from maternal hospitalizations and infant birth certificates. In addition, relative increases and 95% confidence intervals (CIs) were used to estimate differences in primary cesarean section rates by indication for the earliest (1991-1992) and most recent (2007-2008) periods. Racial/ethnic disparities in primary cesarean deliveries were examined by comparing the relative risks from multiple logistic regression models.

RESULTS

The rate of primary cesarean section among white, African American, Hispanic, and Asian/Pacific Islander women increased by 61.6%, 64.1%, 62.4%, and 70.2%, respectively, between 1991 and 2008. In comparison to the primary cesarean section rate for white women, the rate was 25% (95% confidence interval [CI], 22-29%) higher for African American women, 19% (95% CI, 16-23%) higher for Asian/Pacific Islander women, but 14% (95% CI, 13-16%) lower for Hispanic women. After adjustment for confounding factors, primary cesarean section rates remained significantly higher for African American women but lower for Hispanic women compared with white women. Indication subtypes-specific rates of primary cesarean section varied markedly across race/ethnicity.

CONCLUSION

We found that the overall primary cesarean section rate has increased over time. In addition, there is a wide variability in rate of indications for primary cesarean section by race/ethnicity.

Comparative analysis of international cesarean delivery rates using 10-group classification identifies significant variation in spontaneous labor

OBJECTIVE

Cesarean section (CS) rates continue to rise throughout the developed world. The aim of this study was to highlight variations in obstetric populations and practices and to identify variations in CS rates in different institutions.

STUDY DESIGN

Data from 9 institutional cohorts (total, 47,402; range, 1962-7985) from 9 different countries were examined using a 10-group classification system based on 4 characteristics of every pregnancy, namely single/multiple, nulliparity/multiparity, multiparity with CS scar, spontaneous/induced labor onset and term (>or=37 weeks) gestation.

RESULTS

Overall CS rates correlated with CS rates in singleton cephalic nullipara (r = 0.992; P < .001). Whereas CS rates in induced labor were similar, greatest institutional variation were seen in spontaneously laboring multiparas (6.7-fold difference) and nulliparas (3.7-fold difference).

CONCLUSION

Ten-group analysis of international obstetric cesarean practice identifies wide variations in women in spontaneous cephalic term labor, a low-risk cohort amenable to effective intrapartum corrective intervention.