Obstetric characteristics and perinatal outcome of pregnancies with uterine leiomyomas

OBJECTIVE: To determine the rate, obstetric characteristics and perinatal outcome of pregnancies with uterine leiomyomas. STUDY DESIGN: A population-based study comparing all singleton deliveries between the years 1988 and 1999 in women with and without uterine leiomyomas was performed. Patients lacking prenatal care were excluded from the analysis. Multivariable analysis, adjusting for possible confounders, such as maternal age, parity and gestational age, was performed to investigate associations between uterine leiomyomas and selected outcomes. RESULTS: There were 105,909 singleton deliveries with 690 (0.65%) complicated by uterine leiomyomas during the study period. Using a multivariable analysis, the following conditions were significantly associated with uterine leiomyomas: nulliparity (odds ratio [OR]=4.0, 95% confidence interval [CI] 3.3-4.7, P<.001), chronic hypertension (OR=1.9, 95% CI 1.6-2.4, P<.001), hydramnios (OR=1.5, 95% CI 1.2-2.0, P<.001), diabetes mellitus (OR=1.4, 95% CI 1.1-1.7, P=.001) and advanced maternal age (OR=1.2, 95% CI 1.1-1.2, P<.001). Higher rates of perinatal mortality (2.2% vs. 1.2%, OR=1.8, 95% CI 1.1-3.2, P<.001) were found in the uterine leiomyoma group as compared to the control group. While adjusting for maternal age, parity, gestational age and malpresentation, pregnancies with uterine leiomyomas had higher rates of cesarean deliveries (OR=6.7, 95% CI 5.5-8.1, P<.001), placental abruption (OR=2.6, 95% CI 1.6-4.2, P<.001) and preterm deliveries (<36 weeks' gestation, OR=1.4, 95% CI 1.1-1.7, P=.009) as compared to pregnancies without uterine leiomyomas. Conversely, no significant differences were noted regarding perinatal mortality (OR=1.4, 95% CI 0.7-2.8, P=.351) after controlling for maternal age, parity and gestational age using a multivariable analysis. CONCLUSION: Uterine leiomyomas increase the risk of adverse pregnancy outcomes, thus emphasizing the importance of appropriate intrapartum management of these high-risk pregnancies.     

Identifying risk factors for peripartum cesarean hysterectomy. A population-based study

OBJECTIVE: To determine the incidence of, and obstetric risk factors for, emergency peripartum hysterectomy. STUDY DESIGN: A population-based study comparing all singleton deliveries between the years 1988 and 1999 that were complicated with peripartum hysterectomy to deliveries without this complication. Statistical analysis was performed with multiple logistic regression analysis. RESULTS: Emergency peripartum hysterectomy complicated 0.048% (n = 56) of deliveries in the study (n = 117,685). Independent risk factors for emergency peripartum hysterectomy from a backward, stepwise, multivariable logistic regression model were: uterine rupture (OR = 521.4, 95% CI 197.1-1379.7), placenta previa (OR = 8.2, 95% CI 2.2-31.0), postpartum hemorrhage (OR = 33.3, 95% CI 12.6-88.1), cervical tears (OR = 18.0, 95% CI 6.2-52.4), placenta accreta (OR = 13.2, 95% CI 3.5-50.0), second-trimester bleeding (OR = 9.5, 95% CI 2.3-40.1), previous cesarean section (OR = 6.9, 95% CI 3.7-12.8) and grand multiparity (> 5 deliveries) (OR = 3.4, 95% CI 1.8-6.3). Newborns delivered after peripartum hysterectomy had lower Apgar scores (< 7) at 1 and 5 minutes than did others (OR = 11.5, 95% CI 6.2-20.9 and OR = 27.4, 95% CI 11.2-67.4, respectively). In addition, higher rates of perinatal mortality were noted in the uterine hysterectomy vs. the comparison group (OR = 15.9, 95% CI 7.5-32.6). Affected women were more likely than the controls to receive packed-cell transfusions (OR = 457.7, 95% CI 199.2-1105.8) and had lower hemoglobin levels at discharge from the hospital (9.9 +/- 1.3 vs. 12.8 +/- 5.7, P < .001). CONCLUSION: Cesarean deliveries in patients with suspected placenta accreta, specifically those performed due to placenta previa in women with a previous uterine scar, should involve specially trained obstetricians. In addition, detailed informed consent about the possibility of emergency peripartum hysterectomy and its associated morbidity should be obtained.     

Delivery after previous cesarean: a risk evaluation. Swiss Working Group of Obstetric and Gynecologic Institutions

OBJECTIVE: To examine the risks of vaginal delivery after previous cesarean and to find criteria to help decide whether a trial of labor or an elective repeat cesarean should be preferred. METHODS: We evaluated 29,046 deliveries after previous cesarean registered in a pooled database of 457,825 deliveries used to assess quality control in gynecology and obstetrics departments in Switzerland. RESULTS: Among the 17,613 trial-of-labor cases logged (attempt rate 60.64%), the success rate was 73.73% (65.56% after inducing labor and 75.06% after the spontaneous onset of labor). The following complications were significantly more frequent in the previous-cesarean group: maternal febrile episodes (relative risk [RR] 2.77; 95% confidence interval [CI] 2.52, 3.05), thromboembolic events (RR 2.81; CI 2.23, 3.55), bleeding due to placenta previa during pregnancy (RR 2.06; CI 1.70, 2.49), uterine rupture (92 cases; RR 42.18; CI 31.09, 57.24), and perinatal mortality (118 cases, including six associated with uterine rupture; RR 1.33; CI 1.10, 1.62). The postcesarean group also showed a 0.28% rate of peripartum hysterectomy (81 cases; RR 6.07; CI 4.71, 7.83). There was one maternal death in the group, compared with 14 maternal deaths in the group without previous cesarean (no statistical significance). The risk of uterine rupture for patients with previous cesareans was elevated in the trial-of-labor group compared with the group without trial of labor (RR 2.07; CI 1.29, 3.30), but all other maternal risks, including peripartum hysterectomy (RR 0.36; CI 0.23, 0.56), were lower. When comparing the women having a trial of labor, the 70 with uterine rupture more often had induced labor (24.29% compared with 13.92% in the nonrupture group; P = .013), had epidural anesthesia (24.29% compared with 8.44%; P < .001), had an abnormal fetal heart rate tracing (32.86% compared with 8.53%; P < .001), and had failure to progress (21.43% compared with 7.98%; P = .001). CONCLUSION: A history of cesarean delivery significantly elevates the risks for mother and child in future deliveries. Nonetheless, a trial of labor after previous cesarean is safe. Induction of labor, epidural anesthesia, failure to progress, and abnormal fetal heart rate pattern are all associated with failure of a trial of labor and uterine rupture.     

Risk factors for arrest of descent during the second stage of labor.

OBJECTIVE: To define obstetrical risk factors for arrest of descent during the second stage of labor and to determine perinatal outcome. STUDY DESIGN: All singleton, vertex, term deliveries with an unscarred uterus, between the years 1988 and 1999 were included. Univariable and multivariable analysis were performed to investigate independent risk factors associated with arrest of descent during the second stage of labor and the perinatal outcome. RESULTS: The study included 93266 deliveries, of these 1545 (1.7%) were complicated with arrest of descent during the second stage of labor. Using a multivariable analysis, the following obstetric risk factors were found to be significantly associated with arrest of descent: nulliparity (OR=7.8, 95% CI=6.9-8.7; P<0.001), birth weight >4 kg (OR=2.3, 95% CI=1.9-2.8; P<0.001), epidural analgesia (OR=1.8, 95% CI=1.6-2.0; P<0.001), hydramnios (OR=1.6, 95% CI=1.3-2.0; P<0.001), hypertensive disorders (OR=1.5, 95% CI=1.3-1.8; P<0.001), gestational diabetes A1 and A2 (OR=1.5, 95% CI=1.2-1.8; P<0.001), male gender (OR=1.4, 95% CI=1.2-1.5; P<0.001), premature rupture of membranes (PROM, OR=1.3, 95% CI=1.04-1.6; P=0.021), and induction of labor (OR=1.2, 95% CI=1.02-1.4; P=0.030). Deliveries complicated by arrest of descent resulted in cesarean section in 20.6%, vacuum extraction in 74.0%, and forceps delivery in 5.4%. Newborns delivered after arrest of descent during the second stage of labor had significantly higher rates of low Apgar scores (<7) at 1 and 5 min, as compared to the controls (12.7 vs. 2.1%, P<0.001; and 0.9 vs. 0.2%, P<0.001, respectively). Nevertheless, no significant differences were noted between the groups regarding perinatal mortality (0.38 vs. 0.44%; P=0.759). CONCLUSIONS: Major risk factors for arrest of descent during the second stage of labor were nulliparity, fetal macrosomia, epidural analgesia, hydramnios, hypertensive disorders and gestational diabetes mellitus. These risk factors should be carefully evaluated during pregnancy in order to actively manage high-risk pregnancies.     

Malpresentations--impact on mode of delivery

Fetal malpresentation, including persistent occipitoposterior position, is a major cause of dystocia resulting in obstetric interventions. We studied malpresentation among 11 957 consecutive singleton deliveries from 1995 to 2004. There were 1 030 deliveries with a malpresentation (8.6%). Cephalic malpresentations occurred in 5.4% of deliveries (persistent occipitoposterior 5.2%, face 0.1%, brow 0.14%), and 3.1% had breech presentation and 0.12% a transverse lie. The odds ratios (OR) for cesarean section were 14.89 (95%CI 11.91-18.63) in breech presentation and 4.57 (95% CI 3.85-5.42) in persistent occipitoposterior presentation. With persistent occipitoposterior position, the OR for instrumental vaginal delivery was 3.84 (95%CI 3.14-4.70). Primiparity was associated with increased malpresentation risks, as 54.6% of those with malpresentations were primiparous compared with 41.7% of those without (OR 1.68, 95%CI 1.48-1.91, p < 0.001). Primiparous women required more cesarean sections (OR 1.92, 95%CI 1.50-2.47) and instrumental deliveries (OR 2.89, 95%CI 1.50-2.47). Malpresentation frequently leads to cesarean section or instrumental delivery, especially among primiparous women.     

Short stature--an independent risk factor for Cesarean delivery

OBJECTIVE: The present study was aimed to investigate pregnancy outcome of patients with short stature (height<155 cm), and specifically to elucidate if patients with short stature are at an increased risk for Cesarean section (CS) even after controlling for labor dystocia. METHODS: A population-based study comparing pregnancy outcome of patients with and without short stature, was performed. Deliveries occurred during the years 1988-2002, in a tertiary medical center. Stratified analyses, using the Mantel-Haenszel technique, and a multiple logistic regression model were performed to control for confounders. RESULTS: During the study period, 159,210 deliveries occurred. Of these, 5822 (3.65%) were of patients with short stature. Patients with short stature had statistically significant higher rates of CS compared with patients>or=155 cm (21.3% versus 11.9%, odds ratio (OR)=2.0; 95% confidence interval (CI): 1.9-2.1; P<0.001). Furthermore, there patients had higher rated of previous deliveries by CS (17.5% versus 10.3%, OR=1.8; 95% CI: 1.7-2.0; P<0.001), intrauterine growth restriction (IUGR, 3.2% versus 1.9%, OR=1.7; 95% CI: 1.4-1.9; P<0.001), premature rupture of membranes (PROM, 7.1% versus 5.6%, OR=1.3; 95% CI: 1.2-1.4; P<0.001), failed induction (0.7% versus 0.4%, OR=2.0; 95% CI: 1.5-2.8; P<0.001), labor dystocia (6.1% versus 3.5%, OR=1.8; 95% CI: 1.6-2.0; P<0.001), mal-presentations (7.6% versus 6.1%, OR=1.3; 95% CI: 1.1-1.4; P<0.001), and cephalopelvic disproportion (CPD, 0.9% versus 0.3%, OR=2.6; 95% CI: 1.9-3.4; P<0.001). No significant differences were noted between the groups regarding perinatal complications such as low birth-weight, meconium-stained amniotic fluid, perinatal mortality, and low Apgar scores at 5 min. Controlling for possible confounders such as previous CS, IUGR, PROM, failed induction, labor dystocia, mal-presentations and CPD, using the Mantel-Haenszel technique, did not change the significant association between short stature and CS. Moreover, a multiple logistic regression model was constructed with CS as the outcome variable, controlling for all these confounders. The model found short stature to be an independent risk factor for CS (OR=1.7; 95% CI: 1.6-1.9; P<0.001). CONCLUSION: Short stature is an independent risk factor for Cesarean delivery. Further studies investigating the actual indication for CS should be performed in order to make an informed recommendation regarding the preferred mode of delivery in short parturient women.     

Previous preterm cesarean delivery and risk of subsequent uterine rupture

OBJECTIVE: To determine if women with a history of a previous preterm cesarean delivery experienced an increased risk of subsequent uterine rupture compared with women who had a previous nonclassic term cesarean delivery. METHODS: A prospective observational study was performed in singleton gestations that had a previous nonclassic cesarean delivery from 1999 to 2002. Women with a history of a previous preterm cesarean delivery were compared with women who had a previous term cesarean delivery. Women who had both a preterm and term cesarean delivery were included in the preterm group. RESULTS: A prior preterm cesarean delivery was significantly associated with an increased risk of subsequent uterine rupture (0.58% compared with 0.28%, P<.001). When women who had a subsequent elective cesarean delivery were removed (remaining n=26,454) women with a previous preterm cesarean delivery were still significantly more likely to sustain a uterine rupture (0.79% compared with 0.46%, P=.001). However, when only women who had a subsequent trial of labor were included, there was still an absolute increased risk of uterine rupture, but it was not statistically significant (1.00% compared with 0.68%, P=.081). In a multivariable analysis controlling for confounding variables (oxytocin use, two or more previous cesarean deliveries, a cesarean delivery within the past 2 years, and preterm delivery in the current pregnancy), patients with a previous preterm cesarean delivery remained at an increased risk of subsequent uterine rupture (P=.043, odds ratio 1.6, 95% confidence interval 1.01-2.50) compared with women with previous term cesarean delivery. CONCLUSION: Women who have had a previous preterm cesarean delivery are at a minimally increased risk for uterine rupture in a subsequent pregnancy when compared with women who have had previous term cesarean deliveries.     

Single- versus double-layer uterine incision closure and uterine rupture.

OBJECTIVE: To evaluate whether closure of the uterine incision with one or two layers changes uterine rupture or vaginal birth after cesarean section (VBAC) success rates. METHODS: Subjects with one previous cesarean section by documented transverse uterine incision that attempted VBAC were identified. Exclusion criteria included lack of documentation of the type of closure of the previous uterine incision, multiple gestation, more than one previous cesarean section, and previous scar other than low transverse.Uterine rupture and VBAC success rates were compared between those with single-layer and double-layer uterine closure. Time interval between deliveries, birth weight, body mass index (BMI), and history of previous VBAC were evaluated as possible confounders. RESULTS: Of 948 subjects identified, 913 had double-layer closure and 35 had single-layer closure. The uterine rupture rate was significantly higher in the single-layer closure group (8.6% vs. 1.3%, p = 0.015). This finding persisted when controlling for previous VBAC, induction, birth weight >4000 g, delivery interval >19 months, and BMI >29 (OR 8.01, 95% CI 1.96-32.79). There was no difference in VBAC success rate (74.3% vs. 77%, p = 0.685). CONCLUSION: Single-layer uterine closure may be more likely to result in uterine rupture.     

Early amniotomy -- high risk factor for cesarean section.

OBJECTIVE: To evaluate the effect of early amniotomy on mode of delivery and pregnancy outcome in comparison to a group of patients admitted with premature rupture of membranes at term. STUDY DESIGN: The study population consists of all women (n=338) whose labor was induced by amniotomy, between the years 1988 to 1995. The comparison group were all women (n=1865) who were admitted with premature rupture of membranes during the same period. RESULTS: Cesarean section was significantly higher in the amniotomy group than in the comparison group (162 (47.9%) vs. 348 (18.7%), P<0.001). This significant difference was noted only for those who did not had a previous cesarean section (106 (42.4%) vs. 224 (13.8%), P<0.001). Non progressive labor during the first stage was threefold higher in the amniotomy group than in the control group (30.8% vs. 10.9%, P<0.001). Abnormal fetal heart rate patterns were detected during labor in 52 patients (15.4%) of amniotomy group, as compared to 141 cases (7.6%) in the control group (P<0.001). To assess the independent contribution of early amniotomy to having cesarean section in the present delivery, a multiple logistic model was used. Early amniotomy (odds ratio [OR] 3.07, 95% confidence interval [CI] 2.36-4.01), as well as a previous cesarean section (OR 5.04, 95% CI 3.90-6.52) and high parity (OR 1.07, 95% CI 1.03-1.26) were all found as independent risk factors for cesarean section. CONCLUSIONS: Early amniotomy appears to be associated with an increased risk for cesarean section.     

Abnormal placental invasion experience at 1 center

OBJECTIVE: To identify the incidence, risk factors, and maternal and neonatal outcome of pregnancies with abnormal placentation at a single center. STUDY DESIGN: A retrospective review of the medical records of the deliveries in 1999-2003 at the Department of Obstetrics, University Hospital Zurich, was conducted with respect to abnormal placentation, and the incidence, risk factors and outcomes were observed. RESULTS: Thirty-one women with abnormal placentation were identified. They represented 0.31% of deliveries during the 5-year period. The significant factors associated with abnormal placentation were previous uterine curettage (OR = 19.3, 95% CI 11.6-32.3), previous uterine surgery other than cesarean sections (OR = 49.6, 95% CI 24.3-102.3) and coexistent placenta previa (OR = 16.1, 95% CI 4.7-43.7). No case of maternal death occurred, and 1 neonatal death due to uterine rupture occurred in the study group. CONCLUSION: The most important risk factor in abnormal placentation was a previous uterine intervention.     

Umbilical cord prolapse and perinatal outcomes.

OBJECTIVES: To determine obstetric risk factors and perinatal outcomes of pregnancies complicated by umbilical cord prolapse. METHODS: A population-based study was performed comparing all deliveries complicated by cord prolapse to deliveries without this complication. Statistical analysis was performed using multiple logistic regression models. RESULTS: Prolapse of the umbilical cord complicated 0.4% (n=456) of all deliveries included in the study (n=121,227). Independent risk factors for cord prolapse identified by a backward, stepwise multivariate logistic regression model were: malpresentation (OR=5.1; 95% CI 4.1-6.3), hydramnios (OR=3.0; 95% CI 2.3-3.9), true knot of the umbilical cord (OR=3.0; 95% CI 1.8-5.1), preterm delivery (OR=2.1; 95% CI 1.6-2.8), induction of labor (OR=2.2; 95% CI 1.7-2.8), grandmultiparity (>five deliveries, OR=1.9; 95% CI 1.5-2.3), lack of prenatal care (OR=1.4; 95% CI 1.02-1.8), and male gender (OR=1.3; 95% CI 1.1-1.6). Newborns delivered after umbilical cord prolapse graded lower Apgar scores, less than 7, at 5 min (OR=11.9, 95% CI 7.9-17.9), and had longer hospitalizations (mean 5.4+/-3.5 days vs. 2.9+/-2.1 days; P<0.001). Moreover, higher rates of perinatal mortality were noted in the cord prolapse group vs. the control group (OR=6.4, 95% CI 4.5-9.0). Using a multiple logistic regression model controlling for possible confounders, such as preterm delivery, hydramnios, etc., umbilical cord prolapse was found to be an independent contributing factor to perinatal mortality. CONCLUSIONS: Prolapse of the umbilical cord is an independent risk factor for perinatal mortality.     

Trial of labor after 40 weeks' gestation in women with prior cesarean

OBJECTIVE: To compare outcomes in women with prior cesareans delivering at or before 40 weeks' gestation with those delivering after 40 weeks. METHODS: We reviewed labor outcomes over 12 years at one institution for women with one prior cesarean and no other deliveries who had a trial of labor at term. We analyzed the rates of symptomatic uterine rupture and cesarean for term deliveries before or after 40 weeks and stratified for spontaneous and induced labor. Potential confounding by birth weight was controlled using logistic regression. Adjusted odds ratios (OR) and 95% confidence intervals (CI) were calculated. RESULTS: Of 2775 women with one prior scar and no other deliveries, 1504 delivered at or before 40 weeks and 1271 delivered after 40 weeks. For spontaneous labor, rupture rate at or before 40 weeks was 0.5% compared with 1.0% after 40 weeks (P =.2, adjusted OR 2.1, CI 0.7, 5.7). For induced labor, uterine rupture rates were 2.1% at or before 40 weeks and 2.6% after 40 weeks (P =.7, adjusted OR 1.1, CI 0.4, 3.4). For spontaneous labor, rate of cesareans during subsequent trials of labor at or before 40 weeks was 25% compared with 33.5% after 40 weeks (P =.001, adjusted OR 1.5, CI 1.2, 1.8). For induced labor, rate of cesareans during subsequent trials of labor at or before 40 weeks was 33.8% compared with 43% after 40 weeks (P =.03, adjusted OR 1.5, CI 1.1, 2.2). CONCLUSION: The risk of uterine rupture does not increase substantially after 40 weeks but is increased with induction of labor regardless of gestational age. Because spontaneous labor after 40 weeks is associated with a cesarean rate similar to that following induced labor before 40 weeks, awaiting spontaneous labor after 40 weeks does not decrease the likelihood of successful vaginal delivery.     

Pregnancy after bariatric surgery is not associated with adverse perinatal outcome

OBJECTIVE: The purpose of this study was to investigate the pregnancy outcome of patients after bariatric surgery. STUDY DESIGN: A population-based study was performed that compared all pregnancies of patients with and without previous obesity operations between the years 1988 and 2002. Stratified analyses with the Mantel-Haenszel technique and a multiple logistic regression model were performed to control for confounders. RESULTS: Of the 159210 deliveries that were performed during the study period, 298 deliveries were to patients after bariatric operations. No significant differences regarding obstetric characteristics or pregnancy outcome were noted between the open (n=159) and laparoscopic procedures (n=139). With the use of a multivariable analysis, the following conditions were associated significantly with a previous bariatric operation: previous cesarean delivery (odds ratios, 1.4; 95% confidence interval, 1.1-2.0; P=.024), fertility treatments (odds ratios, 2.3; 95% confidence interval, 1.6-3.8; P<.001), premature rupture of membranes (odds ratios, 1.9; 95% confidence interval, 1.3-2.7; P=.001), labor induction (odds ratios, 2.1; 95% confidence interval, 1.6-2.7; P<.001), fetal macrosomia (birth weight, >4 kg; odds ratios, 2.1; 95% confidence interval, 1.4-3.0; P<.001), and obesity (odds ratios, 8.8; 95% confidence interval, 6.1-12.9; P<.001). No significant differences were noted between the groups regarding other pregnancy complications such as placental abruption, placenta previa, labor dystocia, or perinatal complications (such as meconium-stained amniotic fluid, perinatal mortality, congenital malformations and low Apgar scores at 1 and 5 minutes). However, there were higher rates of cesarean delivery among the bariatric operation group (25.2% vs 12.2%; odds ratios, 2.4; 95% confidence interval, 1.9-3.1; P <.001). When controlled for possible confounders (such as previous cesarean delivery, obesity, fertility treatments, premature rupture of membranes, labor induction, diabetes mellitus, hypertensive disorders and fetal macrosomia) by the Mantel-Haenszel technique, the correlation between previous bariatric surgery and cesarean delivery remained significant. CONCLUSION: Previous bariatric surgery, although an independent risk factor for cesarean delivery, is not associated with adverse perinatal outcome.     

Cervical ripening with transcervical foley catheter and the risk of uterine rupture

OBJECTIVE: To estimate whether the rate of uterine rupture in patients with a previous cesarean delivery is related to labor induction and/or cervical ripening using transcervical Foley catheter. METHODS: Charts of all patients who had a trial of labor after a previous cesarean delivery in our institution between 1988 and 2002 were reviewed. The rates of successful vaginal birth after cesarean delivery and uterine rupture in patients with spontaneous labor (control group) were compared with those of patients who underwent a labor induction by means of amniotomy with or without oxytocin and patients who underwent a labor induction/cervical ripening using a transcervical Foley catheter. Logistic regression analysis was performed to adjust for confounding variables. RESULTS: Of 2479 patients, 1807 had a spontaneous labor, 417 had labor induced by amniotomy with or without oxytocin, and 255 had labor induced by using transcervical Foley catheter. The rate of successful vaginal birth after cesarean delivery was significantly different among the groups (78.0% versus 77.9% versus 55.7%, P <.001), but not the rate of uterine rupture (1.1% versus 1.2% versus 1.6%, P =.81). After adjusting for confounding variables, the odds ratio (OR) for successful vaginal birth after cesarean delivery was 0.68 (95% confidence interval [CI] 0.41, 1.15), and the OR for uterine rupture was 0.47 (95% CI 0.06, 3.59) in patients who underwent an induction of labor using a transcervical Foley catheter when compared with patients with spontaneous labor. CONCLUSION: Labor induction using a transcervical Foley catheter was not associated with an increased risk of uterine rupture.     

Rupture of the scarred uterus

OBJECTIVE: To assess the risk of uterine rupture of the scarred uterus according to mode of delivery in subsequent births recorded as spontaneous labour, labour induced by oxytocin, labour after ripening with prostaglandin E2, and planned cesarean section. METHODS: Retrospective study of 2,128 births with a low transversal scar after a previous cesarean section. The study population was realised in a level III university hospital from 1995 to 2003. The association between mode of delivery and uterine rupture was studied in a multivariate logistic regression model, and adjusted for specific antenatal confounding factors. RESULTS: Over 9 years, we collected 22 cases (1%), including 11 asymptomatic ruptures in a population of 2,128 scarred uteri out of 28,248 deliveries. Uterine rupture occurred at a rate of 0.3 per 100 among women with repeated cesarean delivery without labour, 1 per 100 among women with spontaneous onset of labour, 1.4 per 100 among women with oxytocin-induced labour, and 2.2 per 100 among women with prostaglandin cervical ripening. Compared to women with a planned cesarean section, women with spontaneous onset of labour were more likely to have uterine rupture (OR: 4.0; 95% CI: 0.8-42.0). A greater relative risk was observed among women with oxytocin-induced labour (OR: 4.3; 95% CI: 0.3-60.0), and particularly those with prostaglandin-induced labour (OR: 8.7; 95% CI: 1.5-97.3, p=0.01). CONCLUSION: In women with a scarred uterus, prostaglandin E2 induction of labour is a risk factor for uterine rupture. The practice of a systematic cesarean section in cases with Bishop score<3, appropriate induction procedure, and rigorous monitoring of the labour, could make for a safer delivery.     

Spontaneous versus induced labor after a previous cesarean delivery

OBJECTIVE: To compare maternal and neonatal outcomes in spontaneous versus induced labor after one previous cesarean delivery. METHODS: Women with one previous cesarean delivery who had spontaneous labor between January 1992 and January 2000 were compared with those whose labor was induced. RESULTS: Three thousand seven hundred forty-six patients had a trial of labor (2943 spontaneous, 803 induced). Those induced had more frequent early postpartum hemorrhage (7.3% versus 5.0%; odds ratio [OR] 1.66; 95% confidence interval [CI] 1.18, 2.32), cesarean delivery (37.5% versus 24.2%; OR 1.84; 95% CI 1.51, 2.25), and neonatal intensive care unit (NICU) admission (13.3% versus 9.4%; OR 1.69; 95% CI 1.25, 2.29). There was a trend toward higher uterine rupture rates in those with induced versus spontaneous labor (0.7% versus 0.3%, P =.128) and for patients undergoing dinoprostone (prostaglandin E(2)) induction versus other methods (1.1% versus 0.6%, P =.62), although neither difference achieved statistical significance. CONCLUSION: Induced labor is associated with an increased rate of early postpartum hemorrhage, cesarean delivery, and neonatal ICU admission. The higher rate of uterine rupture in those who had labor induced was not statistically significant.     

Association between prior vaginal birth after cesarean and subsequent labor outcome

Objective: To estimate the effect of prior successful vaginal birth after cesarean (VBAC) on the rate of uterine rupture and delivery outcome in women undergoing labor after cesarean.

Methods: A retrospective cohort study of all women attempting labor after cesarean delivery in a university-affiliated tertiary-hospital (2007–2014) was conducted. Study group included women attempting vaginal delivery with a history of cesarean delivery and at least one prior VBAC. Control group included women attempting first vaginal delivery following cesarean delivery. Primary outcome was defined as the rate of uterine rupture. Secondary outcomes were delivery and maternal outcomes.

Results: Of 62,463 deliveries during the study period, 3256 met inclusion criteria. One thousand two hundred and eleven women had VBAC prior to the index labor and 2045 underwent their first labor after cesarean. Women in the study group had a significantly lower rate of uterine rupture 9 (0.7%) in respect to control 33 (1.6%), p?=?.036, and had a higher rate of successful vaginal birth (96 vs. 84.9%, p?p?=?.04).

Conclusions: In women attempting labor after cesarean, prior VBAC appears to be associated with lower rate of uterine rupture and higher rate of successful vaginal birth.     

Outcomes of trial of labor following previous cesarean delivery among women with fetuses weighing >4000 g

OBJECTIVE: To compare outcomes at term of a trial of labor in women with previous cesarean delivery who delivered neonates weighing > 4000 g versus women with those weighing < or = 4000 g. STUDY DESIGN: We reviewed medical records for all women undergoing a trial of labor after prior cesarean delivery during a 12-year period. The current analysis was limited to women at term with one prior cesarean and no other deliveries. The rates of cesarean delivery and symptomatic uterine rupture for women with infants weighing > 4000 g were compared to the rates for women with infants weighing < or = 4000 g. Logistic regression was used to control for the potential confounding by use of epidural, maternal age, labor induction, labor augmentation, indication for previous cesarean, type of uterine hysterotomy, year of delivery, receiving public assistance, and maternal race. Adjusted odds ratios and 95% confidence intervals were calculated. RESULTS: Of 2749 women, 13% (365) had infants with birth weights > 4000 g. Cesarean delivery rate associated with birth weights < or = 4000 g was 29% versus 40% for those with birth weights > 4000 g (P = .001). With use of logistic regression, we found that birth weight > 4000 g was associated with a 1.7-fold increase in risk of cesarean delivery (95% CI, 1.3-2.2). The rate of uterine rupture for women with infants weighing < or = 4000 g was 1.0% versus a 1.6% rate for those with infants weighing > 4000 g (P = .24). Although the logistic regression analysis revealed a somewhat higher rate of uterine rupture associated with birth weights of > 4000 g (adjusted OR, 1.6; 95% CI, 0.7-4.1), this difference was not statistically significant. The rate of uterine rupture was 2.4% for women with infants weighing > 4250 g, but this rate did not differ significantly from the rate of uterine rupture associated with birth weights < or = 4250 g (P = .1). CONCLUSION: A trial of labor after previous cesarean delivery may be a reasonable clinical option for pregnant women with suspected birth weights of > 4000 g, given that the rate of uterine rupture associated with these weights does not appear to be substantially increased when compared to lower birth weights. However, some caution may apply when considering a trial of labor in women with infants weighing > 4250 g. In these women with infants weighing > 4000 g, the likelihood of successful vaginal delivery, although lower than for neonates weighing < or = 4000 g, is still 60%.     

Breech presentation is a risk factor for intrapartum and neonatal death in preterm delivery

OBJECTIVES: To determine the prevalence of malpresentation among preterm births and to evaluate the clinical significance of malpresentation as a predictor of neonatal complications in preterm delivery. STUDY DESIGN: A cross-sectional study was conducted comparing 692 nonvertex preterm deliveries of singleton births (24-36 weeks) to 4685 vertex preterm deliveries. Women with gestational age less than 24 weeks and birthweight <500 g were excluded from the study. RESULTS: The study population included 5377 women who met the inclusion criteria. The prevalence of malpresentation was 12.8% (692/5377); 73% in the breech presentation, 22% in the transverse lie, and 5% in other positions. The mean gestational age at birth was significantly lower in the nonvertex group (32.4+/- 3.5 vs. 34.2+/-2.6; P<0.0001). Higher rates of perinatal mortality (23.1% vs. 10.1%; P<0.0001) were observed in the nonvertex group when compared with vertex births, as well as other complications such as oligohydroamnion (9.2% vs. 3.2%; P<0.0001); small-for-gestational-age; (10.5% vs. 5.9%; P<0.001); congenital anomalies (11% vs. 5.9%; P<0.001); placental abruption (8.7% vs. 4. 1%; P<0.0001); placenta previa (6.8% vs. 2.5%; P<0.0001); premature rupture of membranes (25.4% vs. 16.6%; P<0.0001); chorioamnionitis (7.9% vs. 2.9%; P<0.001); prolapse of cord (2.3% vs. 0.6%; P<0.0001) and cesarean section rate (63.9% vs. 19.1%; P<0.0001). Neonatal mortality was found to be higher for breech presentation, odds ratio (OR)=4 (confidence interval [CI]=2.76-4; P<0.0001), transverse lie, OR=2.1 (1.1-4.12; P<0.02) and for other malpositions, OR=7.3 (2. 72-20; P<0.0001). After multivariate adjustment for birthweight, cesarean section, placental pathology and chorioamnionitis, a strong association remained between the presence of breech presentation and neonatal mortality, with an adjusted OR of 2.2 (CI=1.36-3.63; P<0.01). The adjusted OR for the two other groups of malpresentation was not statistically significant. CONCLUSION: Breech presentation in preterm delivery is an independent risk factor for neonatal mortality after simultaneous adjustment for birthweight, chorioamnionitis and placental pathology. Cesarean section was found to have a protective effect on neonatal mortality rates.     

Peripartum cesarean hysterectomy: critical analysis of risk factors and trends over the years

Objective.?To investigate time trends and risk factors for peripartum cesarean hysterectomy.

Methods.?A population-based study comparing all deliveries that were complicated with peripartum hysterectomy to deliveries without this complication was conducted. Deliveries occurred during the years 1988–2007 at a tertiary medical center. A multiple logistic regression model was constructed to find independent risk factors associated with peripartum hysterectomy.

Results.?Emergency peripartum cesarean hysterectomy complicated 0.06% (n?=?125) of all deliveries in the study period (n?=?211,815). The incidence of peripartum hysterectomy increased over time (1988–1994, 0.04%; 1995–2000, 0.05%; 2001–2007, 0.095%). Independent risk factors for emergency peripratum hysterectomy from a backward, stepwise, multivariable logistic regression model were: uterine rupture (OR?=?487; 95% CI 257.8–919.8, p?<?0.001), placenta previa (OR?=?66.4; 95% CI 39.8–111, p?<?0.001), postpartum hemorrhage (PPH) (OR?=?40.8; 95% CI 22.4–74.6, p?<?0.001), cervical tears (OR?=?22.3; 95% CI 10.4–48.1, p?<?0.001), second trimester bleeding (OR?=?6; 95% CI 1.8–20, p?=?0.003), previous cesarean delivery (OR?=?5.4; 95% CI 3.5–8.4, p?<?0.001), placenta accreta (OR?=?4.7; 95% CI 1.9–11.7, p?=?0.001), and grand multiparity (above five deliveries, OR?=?4.1; 95% CI 2.5–6.6, p?<?0.001). Newborns of these women had lower Apgar scores (<7) at 1 and 5?min (32.7% vs.4.4%; p?<?0.001, and 10.5% vs. 0.6%; p?<?0.001, respectively), and higher rates of perinatal mortality (18.4% vs. 1.4%; p?<?0.001) as compared to the comparison group.

Conclusion.?Significant risk factors for peripartum hysterectomy are uterine rupture, placenta previa, PPH, cervical tears, previous cesarean delivery, placenta accreta, and grand multiparity. Since the incidence rates are increasing over time, careful surveillance is warranted. Cesarean deliveries in patients with placenta previa-accreta, specifically those performed in women with a previous cesarean delivery, should involve specially trained obstetricians, following informed consent regarding the possibility of peripartum hysterectomy.