Management of placenta praevia and accreta

Use of super resolution reconstruction MRI for surgical planning in Placenta accreta spectrum disorder: Case series

INTRODUCTION

Comprehensive imaging using ultrasound and MRI of placenta accreta spectrum (PAS) aims to prevent catastrophic haemorrhage and maternal death. Standard MRI of the placenta is limited by between-slice motion which can be mitigated by super-resolution reconstruction (SRR) MRI. We applied SRR in suspected PAS cases to determine its ability to enhance anatomical placental assessment and predict adverse maternal outcome.

METHODS

Suspected PAS patients (n = 22) underwent MRI at a gestational age (weeks + days) of (32+3±3+2, range (27+1-38+6)). SRR of the placental-myometrial-bladder interface involving rigid motion correction of acquired MRI slices combined with robust outlier detection to reconstruct an isotropic high-resolution volume, was achieved in twelve. 2D MRI or SRR images alone, and paired data were assessed by four radiologists in three review rounds. All radiologists were blinded to results of the ultrasound, original MR image reports, case outcomes, and PAS diagnosis. A Random Forest Classification model was used to highlight the most predictive pathological MRI markers for major obstetric haemorrhage (MOH), bladder adherence (BA), and placental attachment depth (PAD).

RESULTS

At delivery, four patients had placenta praevia with no abnormal attachment, two were clinically diagnosed with PAS, and six had histopathological PAS confirmation. Pathological MRI markers (T2-dark intraplacental bands, and loss of retroplacental T2-hypointense line) predicting MOH were more visible using SRR imaging (accuracy 0.73), in comparison to 2D MRI or paired imaging. Bladder wall interruption, predicting BA, was only easily detected by paired imaging (accuracy 0.72). Better detection of certain pathological markers predicting PAD was found using 2D MRI (placental bulge and myometrial thinning (accuracy 0.81)), and SRR (loss of retroplacental T2-hypointense line (accuracy 0.82)).

DISCUSSION

The addition of SRR to 2D MRI potentially improved anatomical assessment of certain pathological MRI markers of abnormal placentation that predict maternal morbidity which may benefit surgical planning.

CXCL12/CXCR4/CXCR7 axis in placenta tissues of patients with placenta previa

CXCR4 and CXCR7 have been revealed to be receptors of CXCL12. This research was designed to probe the expression of chemokine CXCL12 and its receptors CXCR4 and CXCR7 in placental tissues of patients with placenta previa and the effect of CXCL12/CXCR4/CXCR7 axis on the biological functions of human trophoblast cells. CXCL12, CXCR4, and CXCR7 expression in placental tissue from patients with placenta previa and healthy puerperae was detected. CXCL12, CXCR4, and CXCR7 expression in human trophoblast cell lines (HTR8/SVneo cells) was assessed after suppression or overexpression of CXCL12, CXCR4, and CXCR7. The cell proliferative, invasive, and migratory capacities were also evaluated in HTR8/SVneo cells after suppression or overexpression of CXCL12, CXCR4, and CXCR7. CXCL12, CXCR4, and CXCR7 expression was elevated in placental tissues from patients with placenta previa. Downregulation of CXCL12, CXCR4, and CXCR7 could lead to decreased mRNA levels of CXCL12, CXCR4, and CXCR7 in HTR-8/SVneo cells, which was accompanied by diminished cell proliferative, migratory, and invasive capabilities. Overexpression of CXCL12, CXCR4, and CXCR7 genes presented an opposite tendency. CXCL12, CXCR4, and CXCR7 are highly expressed in placental tissues of patients with placenta previa and induce the biological activities of HTR8/SVneo cells.

Factors associated with poorer childbirth outcomes in pregnant women diagnosed with placenta previa

OBJECTIVE

Placenta previa is a health issue during pregnancy when the placenta wholly or partially covers the opening of the uterus. It can result in bleeding during pregnancy or after delivery, and preterm delivery. This study aimed to investigate the risk factors correlated with poorer childbirth outcomes of placenta previa.

MATERIALS AND METHODS

Between May 2019 and January 2021, pregnant women diagnosed with placenta previa in our hospital were enrolled. Outcomes were postpartum hemorrhage after childbirth, and lower Apgar score and preterm delivery of the neonate. Laboratory blood examination data preoperatively were collected from medical records.

RESULTS

A total of 131 subjects were included, with a median age 31 years. Multivariate analysis showed that fibrinogen reduced risk for postpartum hemorrhage (adjusted odds ratio (aOR): 0.45, 95% confidence interval (CI): 0.26-0.79, p = 0.005). Homocysteine (aOR: 0.73, 95% CI: 0.54-0.99, p = 0.04) reduced the risk while D-dimer (aOR: 1.19, 95% CI: 1.02-1.37, p = 0.02) increased the risk for low Apgar score. Age (aOR: 0.86, 95% CI: 0.77-0.96, p = 0.005) decreased the risk but history of full-term pregnancy more than twice (aOR: 8.58, 95% CI: 2.32-31.71, p = 0.001) increased the risk for preterm delivery.

CONCLUSION

The findings suggest that poorer childbirth outcomes in pregnant women with placenta previa are associated with young age, history of full-term pregnancy, and preoperative concentrations of low fibrinogen, low homocysteine and high D-dimer. This provides obstetricians adjunctive information for early screening of high-risk population and relevant treatment arrangement in advance.

Secondary Postpartum Hemorrhage Due to Retained Placenta Accreta Spectrum: A Case Report

Background

Retained products of conception and placenta accreta spectrum are causes of postpartum hemorrhage. Placenta accreta spectrum is frequently managed with cesarean hysterectomy, but conservative approaches are emerging. We present a case of delayed postpartum hemorrhage secondary to a retained placenta increta.

Case

A 29-year-old G3P2 presented with heavy vaginal bleeding 20 days postoperatively following an uncomplicated classical cesarean delivery at 27 5/7 weeks' gestation for preterm labor in the setting of a vasa previa. On workup, imaging showed retained products of conception and concern for placenta accreta. A hypervascular area in the lower uterine segment was identified at the time of postpartum laparotomy. Total abdominal hysterectomy was performed due to postpartum hemorrhage and clinical suspicion for placenta accreta spectrum disorder. Pathology confirmed a placenta increta.

Conclusion

Diagnosis of placenta accreta spectrum in the remote postpartum period is uncommon but should be a considered etiology in delayed postpartum hemorrhage. Careful inspection and documentation of the placenta implantation site should occur in cesarean sections because placenta accreta spectrum disorders can remain unnoticed during delivery.

Comparison of Adverse Maternal and Neonatal Outcomes in Women Affected by Placenta Previa With and Without a History of Cesarean Delivery: A Cohort Study

OBJECTIVE

Comprehensive comparison of maternal and neonatal outcomes between placenta previa with and without a history of caesarean delivery is sparse in the literature. The objective of this study was to conduct such an analysis.

METHODS

We conducted a retrospective cohort study involving all cases of placenta previa among 56 070 singleton births at two tertiary care hospitals in Guangdong, China, between January 2014 and December 2018. Placenta previa cases were divided into two groups: those with a history of caesarean delivery and those without. We first compared baseline characteristics and then compared maternal and neonatal outcomes between the two groups. Multiple log binomial regression and multiple linear regression analyses were performed to estimate independent association between a history of caesarean delivery and adverse maternal and neonatal outcomes.

RESULTS

A total of 773 placenta previa cases were included in the final analysis. Of them, 546 had a history of cesarean delivery and 227 did not. Compared with placenta previa cases without a history of cesarean delivery, placenta previa cases with a history of caesarean delivery were at increased risks of placenta accrete and increta, uterine rapture, shock, severe anemia, hysterectomy, and increased bleeding and hospital costs. No differences in neonatal outcomes between the two groups were observed.

CONCLUSIONS

History of caesarean delivery is associated with an increased risk of adverse maternal outcomes but not with neonatal outcomes with placenta previa.

Intra-operative cell salvage for cesarean delivery: a retrospective study using propensity score matched analysis

BACKGROUND

Obstetric hemorrhage is a major cause of maternal death during cesarean delivery. The objective of this retrospective observational study was to evaluate the efficacy and safety of intra-operative cell salvage (IOCS) in cesarean section.

METHODS

We included a total of 361 patients diagnosed with central placenta previa who underwent cesarean section from May 2016 to December 2018. In this study, 196 patients received autologous transfusion using IOCS (IOCS group) and 165 patients accepted allogeneic blood transfusion (ABT group). Propensity score matched analysis was performed to balance differences in the baseline variables between the IOCS group and ABT group. Patients in the IOCS group were matched 1:1 to patients in the ABT group.

RESULTS

After propensity score matching, 137 pairs of cases between the two groups were successfully matched and no significant differences in baseline characteristics were found between the IOCS group and ABT group. Patients in the IOCS group were associated with significantly shorter length of hospital stay, compared with ABT group (8.9 ± 4.1 days vs. 10.3 ± 5.2 days, t = -2.506, P = 0.013). The postoperative length of hospital stay was 5.3 ± 1.4 days for patients in the IOCS group and 6.6 ± 3.6 days for those in the ABT group (t = -4.056, P < 0.001). The post-operative hemoglobin level in the IOCS group and ABT group was 101.3 ± 15.4 and 96.3 ± 16.6 g/L, respectively, which were significantly different (t = 2.615, P = 0.009). Allogeneic red blood cell transfusion was significantly lower at 0 unit (range: 0-11.5 units) in the IOCS group when compared with 2 units (range: 1-20 units) in the ABT group (P < 0.001).

CONCLUSIONS

This retrospective observational study using propensity score matched analysis suggested that IOCS was associated with shorter length of postoperative hospital stay and higher post-operative hemoglobin levels during cesarean delivery.

The use of magnetic resonance imaging to predict placenta previa with placenta accreta spectrum

INTRODUCTION

Massive hemorrhage due to placenta previa with placenta accreta spectrum is associated with high maternal mortality and morbidity. Therefore, accurate prediction of placenta previa with placenta accreta spectrum is essential; magnetic resonance imaging (MRI) is a useful tool for this purpose. This study investigated novel predictors of anterior and posterior placenta previa with placenta accreta spectrum using MRI.

MATERIAL AND METHODS

This was a retrospective study at a tertiary obstetrics hospital in Japan. The singleton patients with placenta previa who were scanned with MRI prenatally and had a cesarean section at our institution between 2007 and 2018 were included. The prediction of anterior and posterior placenta previa with placenta accreta spectrum was evaluated using four MRI findings: heterogeneous signals in the placenta, dark T2-weighted intraplacental bands, myometrial thinning or interruption, and focal uterine bulging. The prediction of posterior placenta previa with placenta accreta spectrum was performed using the quantification of cervical varicosities, which were defined as the ratio of the distance between the minimum distance from the most dorsal cervical varicosities (a) to the deciduous and amniotic placenta (b) on a sagittal image.

RESULTS

Among 202 patients, 14 (6.9%) patients were pathologically diagnosed as having placenta accreta spectrum. Further, 38 (18.8%) patients had anterior placenta previa and 164 (81.2%) patients had posterior placenta previa. When anterior placenta previa with placenta accreta spectrum was predicted using at least one of the four MRI findings, the sensitivity and specificity of the anterior placenta previa with placenta accreta spectrum were 87.5% and 86.7%, respectively. In contrast, the sensitivity and specificity of posterior placenta previa with placenta accreta spectrum were 42.9% and 96.2%, respectively. But when the A/B ratio was set at 0.20, the sensitivity and specificity of the prediction for posterior placenta previa with placenta accreta spectrum using cervical varicosities were 100.0% and 89.2%, respectively.

CONCLUSIONS

The findings of MRI to predict the anterior placenta previa with placenta accreta spectrum were different from posterior placenta previa. The cervical varicosities may be useful in predicting posterior placenta previa with placenta accreta spectrum.

Placenta accreta spectrum disorder: a comparison between fertility-sparing techniques and hysterectomy

This study aimed to compare fertility-sparing interventions and hysterectomy among women with placenta accreta spectrum disorder (PAS) who underwent caesarean deliveries. We retrospectively reviewed the data, and classified 148 patients as follows: group B: Bakri balloon without resection (n = 83); group R: segmental uterine resection (n = 23); and group H: hysterectomy (n = 42). The groups differed significantly with respect to operative time, transfused blood products, and post-operative intensive care unit and hospital stays. Morbidity was the highest in group H. The aforementioned parameters did not differ between Groups B and R. Groups R and H differed regarding the operative time, post-operative hospital stay, and transfused blood products. Although the treatment modality and PAS severity differed between the groups of patients with preserved fertility, the surgical outcome parameters did not differ. Hence, the effectiveness of these approaches may be similar without foregoing patient safety.IMPACT STATEMENTWhat is already known on this subject? As caesarean delivery rates have increased worldwide, the incidence of placenta accreta spectrum disorder (PAS), which has high morbidity and mortality rates, has also risen. Planned caesarean hysterectomy is recommended to reduce mortality and morbidity, but fertility is lost.What do the results of this study add? The severity of PAS can range from mild to severe. A patient-tailored approach, which was based on the intra-operative findings and used either a Bakri balloon tamponade or segmental uterine resection, reduced morbidity and preserved fertility.What are the implications of these findings for clinical practice and/or further research? Instead of adhering to the conventional approach that involves an elective caesarean hysterectomy based on antenatal imaging, more suitable approaches should be considered from the spectrum of haemostatic and fertility-preserving options available, while considering a surgeon's experience, the intra-operative findings, and patients' needs.

Evaluation of the sensitivity and specificity of 2D and color Doppler sonography in the detection of placenta accreta in pregnant women

Introduction:

Placenta accreta is the most common cause of bleeding leading to peripartum hysterectomy, and therefore, due to the importance of accreta in the mortality and morbidity of pregnant women, the correct diagnosis of the patient's final outcome is important. Therefore, this study aimed to evaluate the sensitivity, specificity, and accuracy of sonography diagnosis in the evaluation of placenta accreta by examining the two-dimensional (2D) and color Doppler sonography findings.

Materials and Methods:

Sonography was done for detection of accreta from pregnant women who were suspicious of placenta accreta in the third trimester of pregnancy. They were evaluated to confirm placenta histology for accreta and clinical examination after cesarean surgery at Maternity Ward, Ahvaz Imam Khomeini Hospital. Then they were evaluated as an overview and for the lack of accreta sonography findings. The data collected were analyzed by SPSS V 24.

Results:

About 58 patients (55.8%) of 103 pregnant mothers suspected of accreta with anterior placenta with an average age of 32.9 years after cesarean section were clinically extraordinarily positive and 45 patients (43.3%) were negative. The overall sensitivity and specificity of sonography for the detection of accreta placenta were 97.7% and 86.2%, respectively, which were most sensitive to diffuse and focal lacunar flow (100%) and the least sensitivity (33.3%) was observed for bladder wall interruption. Accuracy, positive predictive value, and negative predictive value of sonography for the diagnosis of accreta placenta with at least one diagnostic criteria were 91.2%, 84.6%, and 98.3%, respectively.

Conclusion:

Sonography, as an affordable and inexpensive diagnostic method, can be worthy by examining placenta for the detection of accreta, which can increase the diagnostic accuracy when combining 2D criteria with color Doppler.

Planned versus urgent deliveries in placenta previa: maternal, surgical and neonatal results

PURPOSE

Placenta previa is abnormal localization of the placenta, associated with high rates of maternal-fetal morbidity and mortality. This abnormal implantation may also be in the form of invasion to surroundings defined as placenta accreta spectrum (PAS). The increasing rates of cesarean section raise the frequency of placenta previa and PAS in recent years. Although there are some recommendations, the optimal timing of caesarean delivery concerning fetal and maternal benefits is still unclear. The aim of this study is to compare maternal, surgical and perinatal outcomes of placenta previa cases who underwent emergency or planned surgery.

METHODS

The women who underwent cesarean section for placenta previa between October 2013 and February 2019 at a tertiary care center were retrospectively analyzed. They were divided into two main groups as planned and urgent, and into two subgroups as complicated (PAS) and uncomplicated (non-PAS).

RESULTS

Of the 313 women who met the inclusion criteria, 176 were planned and 137 were urgent cesarean sections. In the urgent group, gestational age, duration of surgery, maternal preoperative and pre-discharge hemoglobin levels, requirement of blood and blood product, additional surgical interventions, length of maternal postoperative intensive care unit and hospital stay, neonatal birthweight, Apgar scores, length of the follow-up in neonatal intensive care unit, invasive and non-invasive mechanical ventilation were significantly different.

CONCLUSIONS

Maternal complication rates are increased in women who are operated on emergency conditions due to placenta previa. Perinatal outcomes are better in women who underwent planned surgery and in those with gestational age greater than 37 weeks.

Uterine arteries prophylactic occlusion balloon placement in pregnancies with placenta praevia

INTRODUCTION

To evaluate the feasibility of uterine arteries prophylactic occlusion balloon placement (POBP) to reduce hemorrhagic complications associated with placenta praevia.

MATERIAL AND METHODS

A retrospective analysis was carried out from January 2014 to November 2018. Only women with a diagnosis of placenta praevia and gestational age at delivery between 33 and 40 weeks were included. All women were diagnosed using transvaginal ultrasound scan (TVS) and confirmed with magnetic resonance imaging (MRI). All women underwent uterine arteries POBP before caesarean delivery (CD). All patients underwent clinical and instrumental follow-up with semestral outpatient TVS for 2 years after the surgery.

RESULTS

Forty-eight pregnant women were recruited and analyzed. 32/48 patients (66%) had positive anamnesis for previous CDs. Mean blood loss was 510 ± 222 mL. 15/48 patients (31.6%) were supported with RBC concentrate transfusion. In 10 (20.8%) cases, an intrauterine haemostatic balloon (Bakri-Balloon, Cook Medical, Spencer, USA) was used to control the intra-operative hemorrhage. Hysterectomy was performed in eight cases (16.6%). No cases of hemodynamic instability or urinary complications were reported. No postoperative complications occurred. During follow-up, no long-term complications were observed and nine patients had a successful pregnancy.

CONCLUSIONS

Uterine arteries POPB is a promising technique that may be adopted in women with placenta praevia to prevent hemorrhagic complications.

Ultrasound accuracy in prenatal diagnosis of abnormal placentation of posterior placenta previa

OBJECTIVES

To evaluate the accuracy of ultrasound in prenatal diagnosis of Placenta accrete spectrum disorders in patients with posterior placenta previa, and to assess the impact of prenatal diagnosis in our population.

STUDY DESIGN

We prospectively enrolled 198 women with posterior placenta previa from 2011 to 2017. We performed transabdominal and transvaginal ultrasound examinations (Grey-scale and colour/power Doppler). The diagnosis of placenta accreta spectrum disorders was based on detection of at least two of the following criteria: loss of retroplacental clear zone, interruption of uterine serosa-bladder wall interface, turbulent placental lacunae with high velocity flow, myometrial thickness <1 mm, increased vascularity of uterine serosa-bladder wall interface, loss of vascular arch parallel to basal plate and/or irregular intraplacental vascularization. Definitive diagnosis was made at delivery with Caesarean section. Furthermore, we compared maternal outcomes in cases diagnosed antenatal versus that one's diagnosed at delivery.

RESULTS

There were 20/198 cases of placenta accreta spectrum disorders. The two-criteria system identified 12 cases of placenta accreta, providing a 60.0% of sensitivity, 98.8% of specificity, 85.7% of positive and 95.7% of negative predictive value. Maternal outcomes were better in women with prenatal diagnosis of placenta accreta spectrum disorders, although not statistical significant.

CONCLUSIONS

Our data showed that grey-scale and Color-Doppler ultrasound evaluation for detecting placenta accreta spectrum disorders on posterior placenta previa have high specificity, positive and negative predictive value, but a low sensitivity. Nevertheless, an antenatal diagnosis of placenta accreta spectrum disorders for posterior placenta previa should be encouraged.

MRI evaluation of the placenta from normal variants to abnormalities of implantation and malignancies

Even though the placenta has been known for millennia, it is still considered one of the most complex and least understood human organs. Imaging of the placenta is gaining attention due to its impact on fetal and maternal outcomes. MRI plays a vital role in evaluation of inconclusive cases by ultrasonography. It enables precise mapping of placental abnormalities for proper multidisciplinary planning and management. In this article we provide a comprehensive in-depth review of the role of antenatal MR in evaluating "The Placenta." We will describe the protocols and techniques used for MRI of the placenta, review anatomy of the placenta, describe MRI features of major placental abnormalities including those related to position, depth of implantation, hemorrhage, gestational trophoblastic neoplasia, and retained products of conception and discuss the added value of MRI in the management and preoperative planning of such abnormalities. Level of Evidence: 3 Technical Efficacy Stage: 5 J. Magn. Reson. Imaging 2019;50:1702-1717.

The management of severe pre-eclampsia and HELLP syndrome in a twin pregnancy with a known morbidly adherent placenta: A case report

Introduction

Morbidly adherent placenta (MAP) is a rare obstetric complication, especially in cases of multiple gestation. We present a case of MAP complicating a dichorionic diamniotic (DCDA) twin pregnancy requiring delivery by emergency cesarean hysterectomy at 30 + 2 weeks of gestation.

Case Presentation

A 36-year-old woman, G3P2, with a DCDA twin pregnancy and known MAP presented to the labour ward at 30 + 2 weeks of gestation with evidence of pre-eclampsia and fulminating HELLP syndrome. Delivery was indicated due to fetal distress, demonstrated by pathological findings on cardiotocography, acutely deranged liver functions and worsening thrombocytopenia. An emergency cesarean hysterectomy was performed with postoperative monitoring in the intensive-care unit. The patient was discharged home on two oral antihypertensive agents. Her platelet count and liver functions were normalized prior to discharge.

Discussion

Delivery planning for pregnancies complicated by MAP should commence early in the antenatal period, especially in cases where there is an anticipated risk of preterm delivery, such as multiple pregnancy. Multidisciplinary elective and emergency care plans should be developed and include interventional radiology services when available. Established protocols help to standardize care of these high-risk pregnancies and aid in decision making in emergency scenarios, such as the one presented.

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Twin pregnancy with morbidly adherent placenta is rare.

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Twin pregnancies with morbidly adherent placenta require early planning of the delivery.

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A multidisciplinary team should be consulted for management of these pregnancies.

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Delivery planning should make provision for both elective and emergency scenarios.

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Interventional radiology services may reduce maternal morbidity peri-operatively.

The role of supracervical hysterectomy in reducing blood products requirement in the management of placenta accreta: a case-control study

Objective: While surgical management is the treatment of choice for abnormally invasive placenta, the role of supracervical hysterectomy in this setting is not well established. We aimed to compare supracervical versus total cesarean hysterectomy as a surgical option for abnormally invasive placenta.Methods: We carried out an 8-year retrospective case-control study. Six cases of a patient treated by total hysterectomy were matched and compared to 30 controls treated by supracervical hysterectomy. Matching of cases with controls was based on coexisting placenta previa, a number of previous cesarean sections, and age, with five controls per case. Cases and controls were comparable in placental invasion topography. We compared the operative approach in all histologically identified cases of abnormally invasive placenta.Results: Overall, 36 women with histologically proven abnormally invasive placenta were identified. Composite blood products morbidity was higher among total hysterectomy patients (p = .02). Freshly frozen plasma utilization was greater among total hysterectomy patients (p = .01). Median operative time (142 ± 48 versus 136 ± 58 minutes) and hospitalization time (8.9 ± 3.1 versus 7.3 ± 1.5 days) were comparable between those who underwent supracervical versus total hysterectomy (p > .05). No case of maternal or neonatal death was encountered.Conclusion: The favorable maternal and perinatal outcomes observed in our study, suggest that supracervical hysterectomy should be considered as the first-line approach in cases of abnormally invasive placenta managed operatively.

Creating a Multidisciplinary Placenta Accreta Program

OBJECTIVE

To develop a formalized comprehensive placenta accreta (PA) program to improve maternal and neonatal outcomes associated with a PA birth.

DESIGN

To develop a clinically innovative PA program, goals were identified and teams were created to collaboratively address best practices in each phase of clinical patient care, along with the financial and marketing aspects necessary for a sustainable program.

SETTING/LOCAL PROBLEM

A Level 3 perinatal center in the Southwestern United States.

IMPLEMENTATION

A diverse multidisciplinary team addressed each aspect of care associated with a PA birth, including team members from the main operating room; trauma surgery; blood bank; interventional radiology unit; NICU; and gynecology-oncology, anesthesia, and urology departments.

MEASUREMENTS

Pre- and postprogram clinical outcome measures were examined including estimated blood loss at birth, postbirth ICU transfers and length of stay, and postpartum length of stay.

RESULTS

Clinical outcomes after program implementation showed decreased blood loss at birth (from an estimated 6,350 ml to 1,300-1,400 ml), reduced postbirth ICU length of stay (from approximately 3 days to less than 1 day, with many women bypassing ICU transfer altogether), and shortened postpartum length of stay (from 8 days to 4 days).

CONCLUSION

With implementation of this PA program, women receive a proactive approach to care that includes education, holistic care, and an organized team approach to birth made possible by the innovative care delivery model, structures, and processes. Standardized checklists and workflows help each clinician understand his or her role in the process, and resources are directed effectively and efficiently. Multidisciplinary, multispecialty collaboration results in decreased variation in care with associated improved patient outcomes.

Placenta percreta is associated with more frequent severe maternal morbidity than placenta accreta

BACKGROUND

Abnormally invasive placentation is the leading cause of obstetric hysterectomy and can cause poor to disastrous maternal outcomes. Most previous studies of peripartum management and maternal morbidity have included variable proportions of severe and less severe cases.

OBJECTIVE

The aim of this study was to compare maternal morbidity from placenta percreta and accreta.

STUDY DESIGN

This retrospective study at a referral center in Paris includes all women with abnormally invasive placentation from 2003 through 2017. Placenta percreta and accreta were diagnosed histologically or clinically. When placenta percreta was suspected before birth, a conservative approach leaving the placenta in situ was proposed because of the intraoperative risk of cesarean delivery. When placenta accreta was suspected, parents were offered a choice of a conservative approach or an attempt to remove the placenta, to be followed in case of failure by hysterectomy. Maternal outcomes were compared between women with placenta percreta and those with placenta accreta/increta. The primary outcome measure was a composite criterion of severe acute maternal morbidity including at least 1 of the following: hysterectomy during cesarean delivery, delayed hysterectomy, transfusion of ≥10 U of packed red blood cells, septic shock, acute kidney injury, cardiovascular failure, maternal transfer to intensive care, or death.

RESULTS

Of the 156 women included, 51 had placenta percreta and 105 placenta accreta. Abnormally invasive placentation was suspected antenatally nearly 4 times more frequently in the percreta than the accreta group (96.1% [49/51] vs 25.7% [27/105], P < .01). Among the 76 women with antenatally suspected abnormally invasive placentation (48.7%), the rate of antenatal decisions for conservative management was higher in the percreta than the accreta group (100% [49/49] vs 40.7% [11/27], P < .01). The composite maternal morbidity rate was significantly higher in the percreta than the accreta group (86.3% [44/51] vs 28/105 [26.7%], P < .001). A secondary analysis restricted to women with an abnormally invasive placentation diameter >6 cm showed similar results (86.0% [43/50) vs 48.7% [19/38), P < .01). The rate of hysterectomy during cesareans was significantly higher in the percreta than the accreta group (52.9% [27/51] vs 20.9% [22/105], P < .01) as was the total hysterectomy rate (43/51 [84.3%] vs 23.8% [25/105], P < .01).

CONCLUSION

Severe maternal morbidity is much more frequent in women with placenta percreta than with placenta accreta, despite multidisciplinary planning, management in a referral center, and better antenatal suspicion.

Diagnostic accuracy of cystoscopy and ultrasonography in the prenatal diagnosis of abnormally invasive placenta

The aim of this study was to compare the accuracy of cystoscopy and ultrasonography for the prenatal diagnosis of abnormally invasive placenta (AIP), including its subgroups: placenta accreta (PA), placenta increta (PI), and placenta percreta (PP).A retrospective observational study including a total of 85 pregnant women at high risk for AIP underwent prenatal cystoscopy and ultrasonography evaluations. The sensitivity (Se), specificity (Sp), positive predictive value, negative predictive value, and exact diagnosed were calculated and compared for both cystoscopy and ultrasonography. Se and Sp values of cystoscopy and ultrasonography were compared by means of the McNemar test.Of the 85 patients, there were 24 (28.2%) PA, 35 (41.2%) PI, 4 (4.7%) PP, and 22 (25.9%) nonadherent placenta. The mean maternal age and gestational age of delivery were 31.88 ± 4.42 years and 36.14 ± 1.84 weeks, respectively. No one was found to develop any complications with cystoscopy like urinary tract infection, or ureteral injury or perforations. Se in the diagnosis of AIP was 50.8% with ultrasonography and 61.9% for cystoscopy. Sp was 86.4% with cystoscopy and 72.7% for ultrasonography. In subgroups, Se with cystoscopy was 25.0%, 62.9%, and 100.0% in PA, PI, and PP, respectively, and 37.5%, 74.3%, and 100.0%, respectively, for ultrasonography; Sp remained unchanged with 86.4% for cystoscopy and 72.7% for ultrasonography. After McNemar test, no difference was found in either Se or Sp between cystoscopy and ultrasonography in AIP and its subgroups.According to the depth of invasion, the diagnostic value of cystoscopy and ultrasonography is all conspicuous increased and they have similar test validity for prenatal diagnosis of AIP and its subgroups.

Placenta accreta complicated with peripartum cardiomyopathy

A 33-year-old G2P1 was referred to our hospital due to placenta accreta. During perioperative preparations, the patient was diagnosed with having a peripartum cardiomyopathy. The patient underwent caesarean hysterectomy at 36 weeks with an associated 2 L blood loss. Haemodynamic maintenance and stabilisation during the operation were challenging, with the combinations of fluid therapy, blood transfusions as well as vasoactive, antifibrinolytic and haemostatic drug. Postoperatively, the patient was managed in the intensive care unit and was subsequently transferred to intermediate care after less than 24 hours' observation. She was stable enough to be moved to the obstetrics ward the next day.

Comparison of maternal and neonatal outcomes for patients with placenta accreta spectrum between online-to-offline management model with standard care model

OBJECTIVE

Online-to-offline is a new model for emergent medical service with the ability to connect care providers with patients on instant basis. This study aims to evaluate maternal and neonatal outcomes in patients with placenta accreta spectrum managed by an online-to-offline care model.

METHODS

Starting from January 1, 2015, management of patients with placenta accreta spectrum was changed from standard care model into an online-to-offline care model through "Wechat" in Guangzhou Medical Centre for Critical Obstetrical Care. This study compared maternal and neonatal outcomes in patients affected by placenta accreta spectrum between 2015 (online-to-offline model) and 2014 (standard care model).

RESULTS

A total of 209 cases of placenta accrete spectrum were treated in our center in 2015 and 218 such cases were treated in 2014. Patients treated in 2015 had lower rate of hysterectomy (14.83% versus 20.64%) and shorter hospital stay (7 days versus 8 days). The average interval from admission to emergency cesarean section for critically ill patients was 38.5 min in 2015 versus 50.7 min in 2014.

CONCLUSION

Patients affected by placenta accreta spectrum managed by online-to-offline care model have reduced risk of hysterectomy, shorter hospital stay, and shorter response time from admission to emergency cesarean section.

The Association Between Low 50 g Glucose Challenge Test Values and Adverse Pregnancy Outcomes

BACKGROUND

The implications of low values on the 50 g glucose challenge test (GCT) in pregnancy are not clearly defined. Few studies have evaluated the influence of maternal low GCT values on obstetrical outcomes. This study aimed to compare pregnancy outcomes between women with low 50 g GCT values and those with normal values.

MATERIALS AND METHODS

Women undergoing gestational diabetes mellitus screening at 24-28 weeks of gestational age between January 2010 and December 2016 were retrospectively evaluated. Women with multifetal pregnancies, prepregnancy type I or II diabetes, GCT performed before 24 or after 28 weeks of gestational age, and women undergoing multiple GCTs in the same pregnancy were excluded. Low GCT values and normal GCT values were defined as ≤85 mg/dL and 86-130 mg/dL, respectively.

RESULTS

Of 3875 screened subjects, 519 (13.4%) women were included in the low GCT group and 3356 (86.6%) in the normal GCT group. Low GCT women had a significantly higher rate of small for gestational age (SGA) infants than normal GCT women (10.8% vs. 7.9%, p = 0.02). Cesarean section and postpartum hemorrhage (PPH) were less frequent in low GCT women than in normal women (32.6% vs. 42.8%, p < 0.01 and 0.2% vs. 1.2%, p = 0.03, respectively). Low GCT women had a 1.38-fold increased risk of bearing SGA infants (95% confidence intervals: 1.01-1.88, p = 0.04).

CONCLUSIONS

Rate of SGA infants was significantly higher and cesarean delivery and PPH rates were significantly lower in women with low GCT values. Low GCT values were independently associated with an increased risk of SGA.

MRI of Placenta Accreta, Placenta Increta, and Placenta Percreta: Pearls and Pitfalls

OBJECTIVE

The purpose of this article is to provide a primer for radiologists performing MRI for suspected placenta accreta, illustrating normal and abnormal findings and diagnostic pitfalls. Appropriate examination indications and recommendations for optimizing image acquisition and interpretation are summarized.

CONCLUSION

MRI increases the accuracy of the workup of high-risk patients and aids in multidisciplinary delivery planning to improve maternal outcome. Reader accuracy and confidence require adherence to examination performance, image interpretation criteria, and awareness of common pitfalls.

Morbidly Adherent Placenta: Its Management and Maternal and Perinatal Outcome

OBJECTIVES

The aim of the study was to identify the risk factors predisposing to morbidly adherent placenta and to study the different modes of management and the obstetric and neonatal outcome of these patients.

METHODS

This was a retrospective cum prospective observational study conducted in the Department of Obstetrics and Gynaecology in a tertiary care referral hospital in Mumbai from January 2012 to November 2014.

RESULTS

The incidence of morbidly adherent placenta was 1.32 per 1000 pregnancies with patient profile comprising second gravida in the age group 26-28 years; 90 % of the patients in this study had previous Caesarean section and co-existing placenta praevia was diagnosed in 63 %. Fifty-three per cent of the women delivered between 35 and 38 weeks and 40 % had elective deliveries. Caesarean section was the mode of delivery in 90 % of the patients. Prophylactic balloon placement in the internal iliac artery followed by classical Caesarean section, uterine artery embolization and post-operative methotrexate was done in 27 % which preserved the uterus and was associated the blood loss of 1000-2000 mL.

CONCLUSION

Antenatal diagnosis of morbidly adherent placenta allows for multidisciplinary planning in an attempt to minimize potential maternal or neonatal morbidity and mortality.

Magnetic Resonance Imaging and Sonography in the Diagnosis of Placental Invasion

OBJECTIVES

To compare older and newer magnetic resonance imaging (MRI) criteria for placental invasion and to compare the sensitivity, specificity, and accuracy of MRI and sonography in determining the depth of placental invasion.

METHODS

Forty pregnant patients at high risk for morbidly adherent placenta based on prenatal sonography underwent MRI evaluations. Two reviewers, who were blinded to the original MRI and sonographic interpretations, clinical history, and obstetric/pathologic findings, reviewed the MRI examinations. The MRI and sonographic scans were analyzed for the presence and depth of invasion. The MRI scans were tabulated for the presence of dark intraplacental T2 bands, bulging of the myometrium, increased vascularity, and indistinct myometrium, loss of the dark T2 myometrial/placental interface, and a thin myometrium. The obstetric/pathologic results served as the reference standards.

RESULTS

Eighteen of 40 patients had a morbidly invasive placenta. The sensitivity, specificity, and accuracy of MRI and sonography were not significantly different. The accuracy rates for determining the depth of placental invasion by readers 1 and 2 were 0.65 and 0.55, respectively (P > .05). According to the Cohen κ statistic, there was a good inter-reader agreement between the MRI readers in assessing the depth of placental invasion (κ = 0.45). The features most commonly seen were dark T2 bands, bulging of the uterus, and loss of the dark T2 interface, which were all associated with the presence of placental invasion.

CONCLUSIONS

The diagnosis of placental invasion remains challenging on sonography and MRI, which perform similarly. The presence of 2 or more criteria adds specificity to the diagnosis of placental invasion on MRI.

Accuracy of ultrasound in antenatal diagnosis of placental attachment disorders

OBJECTIVES

To evaluate the accuracy of ultrasound in the diagnosis of placenta accreta and its variants, and to assess the impact of prenatal diagnosis in our population.

METHODS

A total of 314 women with placenta previa were enrolled prospectively and underwent transabdominal and transvaginal ultrasound examinations. An ultrasound diagnosis (grayscale and color/power Doppler) of placental attachment disorder (PAD) was based on the detection of at least two of the following ('two-criteria system'): loss/irregularity of the retroplacental clear zone, thinning/interruption of the uterine serosa-bladder wall interface, turbulent placental lacunae with high velocity flow, myometrial thickness < 1 mm, increased vascularity of the uterine serosa-bladder wall interface, loss of vascular arch parallel to the basal plate and/or irregular intraplacental vascularization. Definitive diagnosis was made at delivery by Cesarean section. Maternal outcome in cases diagnosed antenatally was compared with that in cases diagnosed at delivery.

RESULTS

There were 37/314 cases of PAD (29 anterior and eight posterior). The two-criteria system identified 30 cases of placenta accreta, providing a sensitivity of 81.1% and specificity of 98.9%. When anterior and posterior placentae were considered separately, the detection rates of PAD were 89.7 and 50.0%, respectIvely. Maternal outcome was better in women with prenatal diagnosis of PAD, as seen by less blood loss and shorter hospitalization.

CONCLUSIONS

Our data confirmed that grayscale and color Doppler ultrasound have good performance in the diagnosis of PAD and that prenatal diagnosis improves maternal outcome. Copyright © 2015 ISUOG. Published by John Wiley & Sons Ltd.

[Fetal death beyond 14 weeks of gestation: induction of labor and obtaining of uterine vacuity]

The objective of this review was to assess benefits and harms of different management options for induction of labor and obtaining of uterine vacuity in case of fetal death beyond of 14 weeks of gestation. In second-trimester, the data are numerous but low methodological quality. In terms of efficiency (induction-expulsion time and uterine evacuation within 24 hours rate) and tolerance in the absence of antecedent of caesarean section, the best protocol for induction of labor in the second-trimester of pregnancy appears to be mifepristone 200mg orally followed 24-48 hours later by vaginal administration of misoprostol 200 to 400 μg every 4 to 6 hours. In third-trimester, there is very little data. The circumstances are similar to induction of labor with living fetus. A term or near term, oxytocin and dinoprostone have a marketing authorization in this indication but misoprostol may be an alternative as the Bishop score and dose of induction of labor with living fetus. In case of previous caesarean section, the risk of uterine rupture is increased in case of a medical induction of labor with prostaglandins. The lowest effective doses should be used (100 to 200 μg every 4 to 6 hours). Prior cervical preparation by the administration of mifepristone and possibly the use of laminar seems essential in this situation.

Caesarean bladder and ureteric injuries in the UK

Lower segment caesarean section (LSCS)-related lower urinary tract injuries are rare. The incidence is rising because of the increasing number of LCSCs being performed. In this review, we classify such injuries into three types and outline their management.

[Placenta accreta: can prenatal diagnosis be performed? Ultrasound and MRI interests. About 27 cases]

OBJECTIVES

To list ultrasonography signs identified when a placenta accreta is suspected. Secondary objectives are to analyze the relevance of diagnosis with ultrasonography and magnetic resonance imaging, and to know diagnosis circumstances in order to identify main risk factors.

PATIENTS AND METHODS

We present a monocentric retrospective study. All the cases of placentas accreta, observed from 2005 to 2010 at Lille University Hospital (France), have been included.

RESULTS

Twenty-seven patients had a placenta accreta during this period. There was an antenatal suspicion for 22 cases and 21 were confirmed after delivery. Six cases were discovered per-partum. Diagnosis was suspected after metrorrhagia for 41% of women. In case of antenatal diagnosis, 100% of the patients had an anterior placenta praevia and an uterine scare. Fifty percent of the placentas accreta diagnosed per-partum were posterior. The most frequently ultrasonography signs are "intra-placental lacuna" (85.7%), "abnormal vascularization" (71.4%), "loss of normal hypoechoic retroplacental myometrial zone" (66.7%), "irregularity of the vesical wall" (66.7%). Sensibility of ultrasonography screening is 78%. Twenty-one magnetic resonance imaging examinations executed secondarily confirmed the diagnosis in 66.7% of the cases.

DISCUSSION AND CONCLUSION

Ultrasonography is a relevant exam for the diagnosis of placenta accreta. Posterior placenta should not be forsaken. Anterior placenta praevia in multiparous patients with a uterine scare should be a warning.

Physiological and molecular determinants of embryo implantation

Embryo implantation involves the intimate interaction between an implantation-competent blastocyst and a receptive uterus, which occurs in a limited time period known as the window of implantation. Emerging evidence shows that defects originating during embryo implantation induce ripple effects with adverse consequences on later gestation events, highlighting the significance of this event for pregnancy success. Although a multitude of cellular events and molecular pathways involved in embryo-uterine crosstalk during implantation have been identified through gene expression studies and genetically engineered mouse models, a comprehensive understanding of the nature of embryo implantation is still missing. This review focuses on recent progress with particular attention to physiological and molecular determinants of blastocyst activation, uterine receptivity, blastocyst attachment and uterine decidualization. A better understanding of underlying mechanisms governing embryo implantation should generate new strategies to rectify implantation failure and improve pregnancy rates in women.

Type and location of placenta previa affect preterm delivery risk related to antepartum hemorrhage

PURPOSE

To evaluate whether type and location of placenta previa affect risk of antepartum hemorrhage-related preterm delivery.

METHODS

We retrospectively studied 162 women with singleton pregnancies presenting placenta previa. Through observation using transvaginal ultrasound the women were categorized into complete or incomplete placenta previa, and then assigned to anterior and posterior groups. Complete placenta previa was defined as a placenta that completely covered the internal cervical os, with the placental margin >2 cm from the os. Incomplete placenta previa comprised marginal placenta previa whose margin adjacent to the internal os and partial placenta previa which covered the os but the margin situated within 2 cm of the os. Maternal characteristics and perinatal outcomes in complete and incomplete placenta previa were compared, and the differences between the anterior and the posterior groups were evaluated.

RESULTS

Antepartum hemorrhage was more prevalent in women with complete placenta previa than in those with incomplete placenta previa (59.1% versus 17.6%), resulting in the higher incidence of preterm delivery in women with complete than in those with incomplete placenta previa [45.1% versus 8.8%; odds ratio (OR) 8.51; 95% confidence interval (CI) 3.59-20.18; p < 0.001]. In complete placenta previa, incidence of antepartum hemorrhage did not significantly differ between the anterior and the posterior groups. However, gestational age at bleeding onset was lower in the anterior group than in the posterior group, and the incidence of preterm delivery was higher in the anterior group than in the posterior group (76.2% versus 32.0%; OR 6.8; 95% CI 2.12-21.84; p = 0.002). In incomplete placenta previa, gestational age at delivery did not significantly differ between the anterior and posterior groups.

CONCLUSION

Obstetricians should be aware of the increased risk of preterm delivery related to antepartum hemorrhage in women with complete placenta previa, particularly when the placenta is located on the anterior wall.

The sonographic appearance and obstetric management of placenta accreta

Placenta accreta is a condition of abnormal placental implantation in which the placental tissue invades beyond the decidua basalis. It may invade into or even through the myometrium and adjacent organs, such as the urinary bladder. The incidence has been rising in recent years. It is one of the important obstetric complications nowadays, leading to significant maternal morbidity and mortality. In the past, this condition was often diagnosed at the time of delivery when massive and unexpected hemorrhage occurred. Hysterectomy, associated with significant physical and psychological consequences, was usually the only management option. As more obstetricians have become aware of this condition, early identification with antenatal imaging diagnostic technology has become possible. Ultrasound scan plays an important role in the antenatal diagnosis. Various sonographic features with different specificity and sensitivity have been described in the literature. In equivocal cases, magnetic resonance imaging may be helpful. With such information, more accurate counseling can be offered to the mothers and their families before delivery. The delivery can also be arranged at a favorable time and in an institution where multidisciplinary support is available. Input from a hematologist, interventional radiologist, intensive care physician, urology surgeon, and/or other specialist are desirable. Apart from hysterectomy, various forms of conservative management can also be considered when the diagnosis is made prior to delivery. Fertility can therefore be preserved. After delivery, with or without hysterectomy performed, psychological support to the mothers and their families is essential.

[Massive obstetric haemorrhage in a patient with placenta percreta]

We present a case of a 38 year-old patient with prenatal diagnosis of placenta praevia. When the elective caesarean began it was found a placenta accreta. In spite of an emergency hysterectomy, embolisation using interventional radiography was needed after a massive obstetric haemorrhage. The post-operative period progressed without incidents.

Roles of microRNA-34a in the pathogenesis of placenta accreta

AIM

MicroRNA-34a (miR-34a) is associated with invasion and metastasis of various cancers. The trophoblastic cells of placenta accreta invade into the myometrium in a similar way to the invasion of cancers. We studied the roles of miR-34a in the pathogenesis of placenta accreta.

METHODS

The human choriocarcinoma cell line JAR was used for in vitro experiments as a model of trophoblasts, and placental tissues from the operative specimen of patients with or without placenta accreta were used for experiments in vivo. Morpholino antisense oligomer against miR-34a (miR-34a Morpho/AS) was added to JAR, and the expression of miR-34a and plasminogen activator inhibitor-1 (PAI-1) was determined by real time PCR. The effects of antisense, interleukin (IL)-6 and IL-8 in the process of invasion were studied with an invasion assay. Expression of miR-34a in vivo was studied with the use of fluorescent in situ hybridization (FISH).

RESULTS

Expression of miR-34a was inhibited by 65% with the administration of antisense, and a slight increase in miR-34a expression was observed with the addition of IL-6 and IL-8. PAI-1 expression decreased with the addition of IL-6 and IL-8, and increased with the administration of antisense. There was an increase in invasive capacity through the inhibition of miR-34a expression. Strong FISH expression of miR-34a was observed in trophoblast cells of non-placenta accreta, and a clear decrease in miR-34a expression was observed in those of placenta accreta.

CONCLUSIONS

Expression of miR-34a was downregulated in placenta accreta. In vitro experiments also showed that the invasive potential of JAR increased by suppressing miR-34a, probably through the expression of PAI-1.

Quality of caesarean delivery services and documentation in first-line referral facilities in Afghanistan: a chart review

Background

Increasing appropriate use and documentation of caesarean section (CS) has the potential to decrease maternal and perinatal mortality in settings with low CS rates. We analyzed data collected as part of a comprehensive needs assessment of emergency obstetric and newborn care (EmONC) facilities in Afghanistan to gain a greater understanding of the clinical indications, timeliness, and outcomes of CS deliveries.

Methods

Records were reviewed at 78 government health facilities expected to function as EmONC providers that were located in secure areas of the country. Information was collected on the three most recent CS deliveries in the preceding 12 months at facilities with at least one CS delivery in the preceding three months. After excluding 16 facilities with no recent CS deliveries, the sample includes 173 CS deliveries at 62 facilities.

Results

No CS deliveries were performed in the previous three months at 21% of facilities surveyed; all of these were lower-level facilities. Most CS deliveries (88%) were classified as emergencies, and only 12% were referrals from another facility. General anesthesia was used in 62% of cases, and spinal or epidural anesthesia in 34%. Only 28% of cases were managed with a partograph. Surgery began less than one hour after the decision for a CS delivery in just 30% of emergency cases. Among the 173 cases, 27 maternal deaths, 28 stillbirths, and 3 early neonatal deaths were documented. In cases of maternal and fetal death, the most common indications for CS delivery were placenta praevia or abruption and malpresentation. In 62% of maternal deaths, the fetus was stillborn or died shortly after birth. In 48% of stillbirths, the fetus had a normal heart rate at the last check. Information on partograph use was missing in 38% of cases, information on parity missing in 23% of cases and indications for cesareans missing in 9%.

Conclusions

Timely referral within and to EmONC facilities would decrease the proportion of CS deliveries that develop to emergency status. While the substantial mortality associated with CS in Afghanistan may be partly due to women coming late for obstetric care, efforts to increase the availability and utilization of CS must also focus on improving the quality of care to reduce mortality. Key goals should be encouraging use of partographs and improving decision-making and documentation around CS deliveries.