Placenta Accreta Spectrum Disorders - The Impact of the Creation of a Multidisciplinary Team on Maternal Outcomes in Portugal / Patologia do espectro do acretismo placentário - O impacto da criação de uma equipa multidisciplinar nos desfechos maternos em Portugal

Abstract Objective To describe a cohort of placenta accreta spectrum (PAS) cases from a tertiary care institution and compare the maternal outcomes before and after the creation of a multidisciplinary team (MDT). Methods Retrospective study using hospital databases. Identification of PAS cases with pathological confirmation between 2010 and 2021. Division in two groups: standard care (SC) group - 2010-2014; and MDT group - 2015-2021. Descriptive analysis of their characteristics and maternal outcomes. Results During the study period, there were 53 cases of PAS (24 - SC group; 29 - MDT group). Standard care group: 1 placenta increta and 3 percreta; 12.5% (3/24) had antenatal suspicion; 4 cases had a peripartum hysterectomy - one planned due to antenatal suspicion of PAS; 3 due to postpartum hemorrhage. Mean estimated blood loss (EBL) was 2,469 mL; transfusion of packed red blood cells (PRBC) in 25% (6/24) - median 7.5 units. Multidisciplinary team group: 4 cases of placenta increta and 3 percreta. The rate of antenatal suspicion was 24.1% (7/29); 9 hysterectomies were performed, 7 planned due to antenatal suspicion of PAS, 1 after intrapartum diagnosis of PAS and 1 after uterine rupture following a second trimester termination of pregnancy. The mean EBL was 1,250 mL, with transfusion of PRBC in 37.9% (11/29) - median 2 units. Conclusion After the creation of the MDT, there was a reduction in the mean EBL and in the median number of PRBC units transfused, despite the higher number of invasive PAS disorders.

Resumo Objetivo Descrever uma coorte de casos do espectro do acretismo placentário (PAS) de uma instituição terciária e comparar os resultados maternos antes e depois da criação de uma equipa multidisciplinar (MDT). Métodos Estudo retrospectivo utilizando bancos de dados hospitalares. Identificação de casos de PAS com confirmação patológica entre 2010 e 2021. Divisão em dois grupos: grupo Standard Care (SC) - 2010-2014; e grupo MDT - 2015-2021. Análise descritiva de suas características e desfechos maternos. Resultados Durante o período do estudo, houve 53 casos de PAS (24 - grupo SC; 29 - grupo MDT). Grupo Standard Care: 1 placenta increta e 3 percretas; 12,5% (3/24) tiveram suspeita anteparto; 4 casos tiveram histerectomia periparto - uma eletiva devido à suspeita anteparto de PAS; 3 devido a hemorragia pós-parto. A média de perda hemática estimada (EBL) foi de 2.469 mL; transfusão de concentrado eritrocitário (PRBC) em 25% (6/24) - mediana 7,5 unidades. Equipa multidisciplinar: 4 casos de placenta increta e 3 percretas. A taxa de suspeita anteparto foi de 24,1% (7/29); foram realizadas 9 histerectomias, 7 eletivas por suspeita anteparto de PAS, 1 após diagnóstico intraparto de PAS e 1 após rotura uterina após interrupção da gravidez no segundo trimestre. A EBL média foi de 1.250 mL, com transfusão de PRBC em 37,9% (11/29) - mediana de 2 unidades. Conclusão Após a criação da MDT, houve redução na média de EBL e na mediana do número de unidades de PRBC transfundidas, apesar do maior número de PAS invasivos.

Establishment of a risk model of placental accreta spectrum by ultrasound combined with clinical high risk factors / 中华超声影像学杂志

Objective:To establish a risk model of placenta accreta spectrum(PAS) based on the clinical risk factors and ultrasound signs of patients with placenta accreta, and identify severe placenta accreta prenatal.Methods:A retrospective analysis was performed on 121 PAS patients admitted to Beijing Obstetrics and Gynecology Hospital Affiliated to Capital Medical University from January 2018 to June 2022 who were clinically classified or pathologically diagnosed during delivery. The two groups were divided into light and severe groups according to the implantation type. The clinical risk factors and ultrasound signs between the two groups were compared. A risk model of PAS was established based on the clinical risk factors and ultrasound signs to predict the perinatal complications.Results:A total of 130 cases of PAS were clinically diagnosed or pathologically diagnosed with placenta, 9 cases with incomplete clinical data or irregular ultrasound images were excluded, and the remaining 121 cases were included in the study. Among the 121 patients, 64 cases were placental accreta, 39 cases were placental increta, and 18 cases were placenta percreta. The placental accreta was defined as mild group, and the combination of placental increta and placenta percreta were referred to as severe group. There were no significant differences in placenta previa, and the number of uterine cavity operations (all P>0.05). There were significant differences in the number of cesarean section, myometrium thinning, placental lacunae, abnormal vascularization at the utero-bladder junction, bridging vessels at the utero-bladder junction, placental protuberance and cervical involvement (all P<0.05). Binary logistic regression analysis showed that placental lacunae, abnormal vasculization of the utero-bladder interface and the number of cesarean sections were independent risk factors for severe PAS. Based on this, a risk model was established and the ROC curve of each independent risk factor and risk model was plotted respectively. The AUC of the risk model was 0.826, which had better diagnostic efficacy than other independent risk factors. Conclusions:In the prenatal ultrasound classification diagnosis of high-risk patients with PAS, the placental lacunae, abnormal vascularization of utero-bladder interface and the number of cesarean section are combined to establish the risk model of PAS, which has a good diagnostic efficacy for severe placenta accreta.

Predictive value of ultrasound signs of the involvement of the cervix in the adverse pregnancy outcomes of placenta accreta spectrum / 中华超声影像学杂志

Objective:To explore the the predictive value of ultrasound signs of the involvement of the cervix in the clinical grade diagnosis of placenta accreta spectrum(PAS) with placenta previa and adverse pregnancy outcomes.Methods:A retrospective analysis was performed on PAS patients with placenta previa diagnosed during delivery or by cesarean section in Beijing Obstetrics and Gynecology Hospital Affiliated to Capital Medical University from January 2018 to March 2021. According to the signs of cervical involvement on prenatal ultrasound, the patients were divided into cervical involvement group and cervical non-involvement group. Logistic analysis was performed on clinical data between the two groups. The clinical data, hysterectomy rate, intraoperative blood loss and clinical diagnosis were compared between the two groups.Results:There were 1 455 patients with PAS diagnosed by clinical diagnosis or placental pathology, of which 170 were with placenta previa, 24 with incomplete clinical data or non-standard ultrasound images, and the remaining 146 patients were included. In the cervical involvement group, all of 6 cases had placenta percreta. Of the 140 cases in the unaffected cervical group, 89 cases (63.6%) had placental accreta, 48 cases (34.3%) had placental increta, and 3 cases (2.1%) had placenta percreta. There were no significant differences of the age and uterine operation history between the two groups. There was significant difference in the number of cesarean sections between the two groups ( P<0.05). There were significant differences in intraoperative blood loss, hysterectomy rate and placenta accreta grade diagnosis between the two groups(χ 2/ Z=4.203, 11.165, 95.248, all P<0.05). Conclusions:The ultrasonographic signs of cervical involvement have a good predictive value for the pregnancy outcome of PAS.

Correlation of An Ultrasonic Scoring System and Intraoperative Blood Loss in Placenta Accreta Spectrum Disorders: A Retrospective Cohort Study / 生物医学与环境科学（英文）

Objective@#This study aims to investigate the correlation of an ultrasonic scoring system with intraoperative blood loss (IBL) in placenta accreta spectrum (PAS) disorders.@*Methods@#A retrospective cohort study was conducted between January 2015 and November 2019. Clinical data for patients with PAS have been obtained from medical records. Generalized additive models were used to explore the nonlinear relationships between ultrasonic scores and IBL. Logistic regressions were used to determine the differences in the risk of IBL ≥ 1,500 mL among groups with different ultrasonic scores.@*Results@#A total of 332 patients participated in the analysis. Generalized additive models showed a significant positive correlation between score and blood loss. The amount of IBL was increased due to the rise in the ultrasonic score. All cases were divided into three groups according to the scores (low score group: ≤ 6 points, @*Conclusions@#The risk of blood loss equal to or greater than 1,500 mL increases further when ultrasonic score greater than or equal to 10 points, the preparation for transfusion and referral mechanism should be considered.

Espectro de placenta acreta

El espectro de placenta acreta (EPA) consiste en una placenta anormalmente adherida al útero que causa hemorragias puerperales severas y sorpresivas, con elevadas cifras de morbimortalidad materna. El tratamiento es quirúrgico y por décadas ha sido la histerectomía la primera opción; sin embargo, en los últimos años aparecen alternativas quirúrgicas para evitar las complicaciones de la histerectomía y preservar la fertilidad de las pacientes. Se realiza una revisión de ensayos controlados, aleatorios y estudios observacionales sobre EPA, con énfasis en lo referente a las alternativas terapéuticas. El manejo quirúrgico del EPA amerita un trabajo multidisciplinario con enfoque preventivo. La histerectomía de emergencia sigue siendo la primera opción en casos de hemorragia severa e inestabilidad hemodinámica, quedando las medidas conservadoras como alternativas válidas, en los casos en que hubo solicitud previa de la paciente, consentimiento informado y ausencia de compromiso hemodinámico. La existencia de múltiples alternativas quirúrgicas conservadoras para el manejo del EPA refleja la ausencia de una técnica ideal y confiable, obligando a afinar nuestro juicio clínico

Placenta accreta spectrum (PAS) is an abnormal placentation that causes unexpected severe postpartum hemorrhage and high morbidity and mortality. Treatment is surgical and hysterectomy has been the first option for decades; however, in the last few years, surgical alternatives try to avoid the severe complications of hysterectomy while preserving woman's fertility. We performed a review of controlled, randomized and observational studies of PAS, with emphasis on therapeutic alternatives. PAS surgical management is a real challenge and merits multidisciplinary and preventive care. Emergency hysterectomy is still the first option in cases of severe hemorrhage and hemodynamic instability, but conservative management is a valid alternative at patient's request, if she gives her informed consent and there is no hemodynamic compromise. The existence of multiple surgical and conservative alternatives in PAS management reflects the absence of an ideal and reliable technique, and requires critical judgment.

Espectro de placenta acreta, experiencia en un hospital peruano / Placenta accreta spectrum, experience in a Peruvian hospital

RESUMEN Introducción . El espectro de placenta acreta (EPA) se refiere a la gama de adherencias patológicas de la placenta al útero. Es considerado un problema de salud pública debido a su notable aumento en las últimas décadas y su asociación a morbimortalidad materna significativa, con riesgo elevado de hemorragia, transfusiones e histerectomía obstétrica. Objetivo . Conocer las características epidemiológicas, quirúrgicas y posquirúrgicas de las pacientes con espectro de placenta acreta. Métodos . Estudio descriptivo, retrospectivo de pacientes con espectro de placenta acreta atendidas en el Hospital San Bartolomé entre 2014 y 2018. Resultados . Se identificaron 36 casos de EPA con una tasa de 1,2/1 000 nacimientos. El 94% era multípara, 81% tuvo cirugía uterina previa, 61% tenía 35 o más años de edad y 47% poseía placenta previa, siendo la cesárea el antecedente quirúrgico uterino más frecuente con 72%. Se recurrió a procedimientos conservadores en 53% y a histerectomía en 47%. Hubo 53% de complicaciones postoperatorias, sin muerte materna. Conclusiones . En el presente estudio se halló que el espectro de placenta acreta estuvo significativamente asociado con la cesárea previa. Si bien hubo un número significativo de casos que se presentaron con hemorragia y choque hipovolémico, las intervenciones quirúrgicas oportunas y un banco de sangre bien provisto evitaron las muertes maternas. El manejo conservador del acretismo focal se mostró como alternativa válida para evitar la histerectomía y sus complicaciones.

ABSTRACT Introduction : Placenta accreta spectrum (PAS) refers to pathological adhesions of the placenta to the uterus. It is considered a public health problem due to its increase in recent decades, and it is associated with significant maternal morbidity and mortality and high risk of hemorrhage, blood transfusions and hysterectomy. Objective : To determine the epidemiological, surgical and post-surgical characteristics of patients with placenta accreta. Methods: Descriptive, retrospective study of patients with placenta accreta spectrum attended at San Bartolomé Hospital, Lima, Peru, between 2014 and 2018. Results : Thirty-six PAS cases were documented with a birth rate of 1.2/1 000; 94% occurred in multiparous women, 81% had previous uterine surgery including 26 (72%) with previous cesarean section; 61% were 35 years old or older, and 47% had placenta previa. Treatment was conservative in 53% of the cases, while hysterectomy was performed in 47%. There were post-surgical complications in 53%, without maternal deaths. Conclusions : In our study, placenta accreta spectrum was predominantly associated with previous cesarean sections. A considerable number of cases presented hemorrhage and hypovolemic shock. Timely surgical intervention and a well-supplied blood bank allowed conservative management in focal accretism as a valid alternative to hysterectomy and its complications.

Clinical perspective: caesarean hysterectomy for placenta accreta spectrum and role of pelvic packing

Caesarean hysterectomy (CH) is considered the gold standard for management of morbidly adherent placenta, now termed as placenta accreta spectrum (PAS). If bleeding is not controlled following removal of uterus, it is sometimes necessary to pack the pelvis and continue monitoring with correction of bleeding and physiological parameters in operating room and intensive care unit. This now comes under the damage control approach, being driven primarily by abnormal physiology rather than anatomical reconstruction. The pelvic packs are removed after about 48 hours. This retrospective study was done in patients with antenatal diagnosis of PAS who required CH, comparing those who required pelvic packing with those who did not. The variables compared were pre-operative (clinical and radiological), intra-operative (duration of surgery, blood loss and transfusion requirements of whole blood and blood products), and the final histopathological diagnosis. Outcome variables in terms of duration of hospital stay, re-admissions, re-laparotomy and complications were also compared. Over two years, three of eight patients with PAS required pelvic packing following CH. There were no differences between the two patient groups with any of the predictor variables or outcomes other than requirement of blood products. This suggests pelvic packing is a safe and efficacious procedure in intractable haemorrhage following CH for PAS. Pelvic packing needs greater awareness amongst obstetricians as the incidence of PAS is likely to increase.

When is the ideal time to remove cerclage in cases requiring cesarean hysterectomy for placenta accreta spectrum?

Placenta accreta spectrum (PAS) presents one of the highest risks to pregnancy and often requires a cesarean hysterectomy for management, but the challenges associated with this surgery often cause severe obstetric haemorrhaging and high rates of maternal morbidity. Shirodkar cerclage is usually performed in cases with cervical insufficiency, a short cervix with previous preterm birth, etc., to decrease the preterm birth rate. It is recommended that Shirodkar cerclage is removed when the patient approaches term, but the ideal timing of removal for patient for whom cesarean hysterectomy is planned is not clear. Here, authors present a case of PAS in whom Shirodkar cerclage that was difficult to remove at the timing of cesarean hysterectomy. After cesarean hysterectomy, the patient had a vaginal abscess and required antibiotic therapy for approximately two weeks. In the light of our case, authors discuss the timing of removal of cerclage in the cases of PAS.

Long non-coding RNAs show different expression profiles and display competing endogenous RNA potential in placenta accreta spectrum disorders / 南方医科大学学报

OBJECTIVE@#To investigate the expression profile of long non-coding RNAs (lncRNA) and identify potential lncRNA-related competing endogenous RNAs (ceRNA) in placenta accrete spectrum disorders (PAS).@*METHODS@#Five tissue specimens of placental implantation and 5 adjacent normal placental tissues were collected from cesarean section deliveries complicated by PAS in our hospital between December, 2017 and June, 2018. Human microarrays were used to identify the lncRNAs that were differentially expressed in PAS, and 5 of the identified lncRNAs were further validated using qRT-PCR. GO and KEGG pathway analyses were performed to indentify the most significant enrichment functions. A ceRNA network was constructed based on ENST00000511361 (RP5-875H18.4), NR_027457 (LINC00221) and NR_126415 (FOXP4-AS1) to pinpoint the potential lncRNAs-related ceRNA.@*RESULTS@#A total of 329 lncRNAs and 179 mRNAs were identified to have differential expression in PAS. The results of qRT-PCR were consistent with the human microarrays results. Transforming growth factor-β (TGF-β) signaling pathway was the most significantly enriched pathway. The constructed ceRNA network suggested that RP5-875H18.4--miRNA-218--SLIT2 had a potential ceRNA regulatory mechanism in PAS.@*CONCLUSIONS@#The differentially expressed lncRNAs are involved in the occurrence and progression of PAS possibly by regulating the TGF-β signaling pathway. The ceRNA network of RP5-875H18.4--miRNA-218--SLIT2 may play a role in the occurrence of PAS.

Acretismo placentario: un diagnóstico emergente. Abordaje quirúrgico no conservador / Placental accreta: an emerging diagnosis. Approach non-conservative surgical

RESUMEN El espectro de acretismo placentario es un fenómeno infrecuente del embarazo cuya incidencia ha aumentado considerablemente y que está caracterizado por el anclaje anormal de las vellosidades coriónicas al miometrio, lo cual aumenta la morbi-mortalidad materna durante la resolución quirúrgica. Según las capas uterinas comprometidas, serán clasificadas como placenta acreta (contacta miometrio), increta (penetra miometrio) y percreta (compromete todo el miometrio y/o eventualmente órganos adyacentes), siendo su mayor factor de riesgo: la cesárea anterior y la placenta previa. En este artículo se realizó una revisión bibliográfica abarcando definiciones, diagnóstico y las nuevas tendencias en manejo quirúrgico no conservador propuesto en la nueva guía de la Federación Internacional de Ginecología y Obstetricia publicada en 2018 y elaborando una discusión respecto a ellas.

SUMMARY Placenta accreta spectrum is an uncommon phenomenon of pregnancy whose incidence has increased considerably over time and is characterized by the abnormal anchoring of the chorionic villi to the myometrium, which increases maternal morbidity and mortality during surgical resolution. According to the compromised uterine layers, they will be classified as placenta accreta (contacts myometrium), increta (penetrates myometrium) and percreta (compromises the entire myometrium and / or possibly adjacent organs), being previous caesarean section and placenta previous its major risk factor. In this review, we included definitions, diagnosis, and the new topics in non-conservative surgical management developed by the International Federation of Obstetrics and Gynecolgy published in 2018, and developing a discussion of the topic.