Application of abdominal aortic balloon occlusion followed by uterine artery embolization for the treatment of pernicious placenta previa complicated with placenta accreta during cesarean section

Objective:This study aimed to investigate the clinical effects of abdominal aortic balloon occlusion followed by uterine artery embolization for the treatment of pernicious placenta previa complicated with placenta accreta during cesarean section.Methods:We performed a retrospective analysis of the clinical data for 623 patients who experienced pernicious placenta previa complicated with placenta accreta and received treatment in our hospital from January 2013 to January 2019.All patients underwent abdominal aortic balloon occlusion before their cesarean section.Seventyeight patients received bilateral uterine artery embolization,and among them,placenta accreta was found at the opening of the cervix in 13 patients.Due to suturing difficulty after the removal of the placenta,gauze packing was used to temporarily compress the hemorrhage.As soon as the uterus was sutured,emergent bilateral uterine artery embolization was performed.Active bleeding was noted in the remaining 65 patients when the lower part of the uterus was pressed after the placenta was removed and the uterus was sutured,therefor,bilateral uterine artery embolization was performed urgently.Results:Of the 623 patients,545 patients underwent only abdominal aortic balloon occlusion and 78 patients underwent additional emergent bilateral uterine artery embolization due to hemorrhaging during or after their cesarean section.No hysterectomies were performed.In the 78 patients,the amount of bleeding was 800-3,200 ml with an average of 1,650 ml during the operation;the volume of blood transfused was 360-1,750 ml(average:960 ml).The fetal fluoroscopy time was 3–8 s(average:5 s).The dose of radiation exposure was(4.2±2.9) m Gy.Fetal appearance,pulse,grimace,activity,and respiration(Apgar) score were normal.No serious complications were observed during or after the operation in the follow-up visits.Conclusion:For patients with pernicious placenta previa complicated with placenta accreta who experience active bleeding after cesarean section and abdominal aortic balloon occlusion,bilateral uterine artery embolization can effectively reduce blood loss and requirement of blood transfusion during the operation,and lowers the risk of hysterectomy.

Correlation of An Ultrasonic Scoring System and Intraoperative Blood Loss in Placenta Accreta Spectrum Disorders: A Retrospective Cohort Study

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 m L 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, n = 147;median score group: 7-9 points, n = 126;and high score group: ≥ 10 points, n = 59). Compared with the low score group, the high score group showed a higher risk of IBL≥ 1,500 m L [odds ratio, 15.09;95% confidence interval(3.85, 59.19);P ≤ 0.001] after a multivariable adjustment.Conclusions The risk of blood loss equal to or greater than 1,500 m L increases further when ultrasonic score greater than or equal to 10 points, the preparation for transfusion and referral mechanism should be considered.

Subsequent placenta accreta after previous mifepristone-induced abortion: A case report

BACKGROUND Mifepristone-induced abortion(MIA)has been used worldwide to terminate pregnancies.However,the association between placenta accrete(PA)and MIA has seldom been reported.CASE SUMMARY A 26-year-old pregnant woman presented with painless vaginal bleeding at 35 wk of gestation.She had a medical abortion(mifepristone followed by misoprostol)1 year ago at the sixth week of gestation.Her personal history for previous surgery was negative.Abdominal ultrasonography showed a normal foetus with complete placenta previa.The foetal membrane ruptured with massive vaginal bleeding and severe abdominal pain.An emergency Caesarean section was performed,and the newborn was delivered.The placenta failed to expel and manual extraction was carried out.A large defect was noted in the uterine fundus and repair of the uterine rupture was conducted immediately.The postoperative pathology report showed placenta accreta.CONCLUSION The evidence suggests a possible etiologic role of MIA in PA,as the incidence of PA after MIA is much higher than general population.Millions of pregnancies are complicated by PA each year,some of which result in fatality.To prevent subsequent placental complications after MIA,hormonal supplementation might be a promising therapeutic options.However,further studies are needed to identify the high-risk factors and to confirm the effectiveness of estrogen supplement therapy.

Application of Abdominal Aortic Balloon Occlusion Combined with Tourniquet in Pregnant Women with Severe Placenta Accreta Spectrum

Objective Abdominal aortic balloon occlusion(AABO)is a vascular intervention method that has been widely used in the treatment of severe placenta accreta spectrum(PAS).The aim of this study was to investigate the benefits,potential risks,and characteristics of AABO combined with tourniquet binding of the lower uterine segment(LUS)in treatment of pregnant women with PAS.Methods In this study,64 pregnant women with PAS scores greater than 5 were enrolled as research subjects and divided into two groups.Group A(n=34)underwent normal operative procedures including tourniquet binding of the LUS.Group B(n=30)underwent AABO combined with tourniquet binding of the LUS.General clinical characteristics,ultrasonography PAS score,intraoperative blood loss(IBL),blood loss within 24 h after surgery(24-h BL),postoperative complications,and neonatal data of the two groups were retrospectively reviewed.The influencing factors of IBL for the two groups were analyzed.Results The amounts of IBL,24-h BL,total input red blood cell,and the incidence of disseminated intravascular coagulation were significantly lower in group B than in group A(P<0.05),and this difference was even more significant in the subgroup of placenta percreta(PAS scores≥10).Further multivariate linear analysis showed that the combined therapy of AABO and tourniquet could independently predict lower IBL than normal operative procedures did(P=0.001).Conclusion AABO combined with tourniquet binding of the LUS could improve the outcomes of pregnant women with severe PAS and reduce serious peripartum complications of AABO.

Surgical Excision of Placenta with Lower Uterine Segment as a Conservative Management in a Case of Placenta Accreta: A Case Report

Introduction: Placenta accreta is due to invasive placental implantation. It is diagnosed when there is failure of delivery of a retained placenta. This is usually complicated by massive intrapartum hemorrhage that ends by hysterectomy. Case: We report a case of conservative management in a case of placenta accreta involving an elliptical shape incision of the lower segment with removal of placenta with underlying lower uterine segment in a stable patient desiring future fertility. Conclusion: Conservative management may be valid in carefully selected cases of placenta accreta diagnosed pre-operatively in tertiary hospitals with availability of blood-bank and multi-disciplinary approach.

Outcome of Patients with Placenta Accreta at El Shatby Maternity University Hospital

Objective: The aim of this study was to determine the incidence, risk factors, and outcomes of management of patients with placenta accreta. Background Placenta accreta occurs when the placental implantation is abnormal. The marked increase in incidence has been attributed to the increasing prevalence of cesarean delivery in recent years. The most common theory is defective decidualization. The most important risk factor for placenta accreta is placenta previa after a prior cesarean delivery. The first clinical manifestation of placenta accreta is usually profuse, life-threatening hemorrhage. The recommended management of suspected placenta accreta is planned preterm cesarean hysterectomy with the placenta left in situ. Patients and methods: It’s a study of all cases of placenta accreta at El-Shatby Maternity University Hospital starting from 1/4/2016 till 1/10/2016. Selection of the cases will only be dependent upon their pregnancy gestational age above 28 weeks of gestation. Results: The incidence of placenta accreta was 1/75 cesarean deliveries. The ultrasonography and doppler had a false negative rate of 54.6% and a sensitivity of 45.2% in diagnosis of placenta accreta. The rate of blood transfusion was 79.6%. Uterine preserving procedures performed in 66%. Cesarean hysterectomy performed in 34%. Intensive care unit admission occurred in 27.3%. The mean gestational age at delivery was 33.8 ± 4.6 weeks’ gestation. 31.8% admitted to the neonatal intensive care unit. Conclusion: The incidence of placenta accreta increased due to the increasing rate of cesarean deliveries, prenatal diagnosis of placenta accreta is paramount, as most women are asymptomatic. Prenatal diagnosis allows time for a multidisciplinary team to make delivery plans, which will help decrease surgical complications.

Conservative Management of Placenta Accreta of Seven Cases

Introduction: Placenta accreta is a potentially life threatening obstetrical condition. The incidence has increased. Diagnosis before delivery allows multidisciplinary planning in an attempt to minimize potential maternal or neonatal morbidity and mortality. Prenatal ultrasonography is used to support the diagnosis and guide clinical management leading probably to favorable outcomes. Actually a conservative option which includes leaving all or part of the placenta in situ when fertility preservation is desired is recommended. Methods: We retrospectively reviewed the medical records of all patients diagnosed with placenta accreta in gynecology-obstetrics department of the university hospital Mohammed the VI of Marrakesh;Morocco;from January the first 2014 to January the second 2016. Results: We found seven cases. We described: The epidemiological characteristics, risk factors, management of placenta accreta, outcomes and prognosis. The incidence of placenta accreta was 1/3847 deliveries. The mean term of delivery was 35 weeks. We have adopted a successful conservative treatment in six cases (71.4%). The radical treatment was adopted in one patient initially admitted for severe post-partum hemorrhage;the prognosis was good in 85.7% cases. Conclusion: Conservative management of placenta accreta is a safe and efficient and is an interesting alternative for hysterectomy.

Modified Triple P Approach by Gynecologic Oncologist-Led Team for Placenta Accreta Spectrum Improves the Outcome: Non-Randomized Controlled Trial

Introduction: Placenta Accreta Spectrum (PAS) is associated with significant maternal and fetal morbidity and mortality. The ideal conservative management still does not exist. We aimed to compare the outcome of cesarean section for PAS by a gynecologic oncologist-led team using the modified triple P approach and by a non-gynecologic oncologist-led team. Material and Methods: This is non-randomized controlled trial. Group A had Cesarean Section by gynecologic oncologist. Gynecologic oncologist-led team did all Cesarean Section following a modified triple P approach. The first P is for “Plan” the uterine incision. The second P for “Pelvic” devascularization by internal iliac artery ligation. The third P is for Placenta non-separation with resection of the myometrium. Group B had Cesarean Section by non-gynecologic oncologist-led team. The main outcome measures were the need for hysterectomy, amount of blood loss, and the management-related complications. Results: Group A had significantly less estimated blood loss, and received less number of backed RBCs units, and less operative time than group B. The uterus is preserved in all cases of group A and in 50% of cases of group B. The overall maternal morbidity rate was 17.5% in group A and 72.2% in group B. Conclusion: This study provides evidence that the modified triple P approach for PAS by gynecologic oncologist-led team presents lower maternal morbidity in comparison to surgery by non-gynecologic oncologist-led team.

Fazari’s Sign in Ultrasound Scan of Morbid Adherent Placenta/Placenta Accreta Spectrum (MAP/PAS) and Fazari’s Triad during (MAP/PAS) Surgery

Morbid Adherent Placenta (MAP)/Placenta Accreta Spectrum (PAS) is a serious diagnosis which has a risk of complications. Ultrasound scan helps in early diagnosis and has great value in further confirmation and follow up. Observed new clinical sign and associated clinical triad are discussed here.

Efficacy of Tourniquet Application in Minimizing Intraoperative Blood Loss in Cesarean Hysterectomies for Placenta Accreta—A Comparative Study

Objective: To assess the effect of tourniquet application of intraoperative blood loss in placenta accreta cases undergoing cesarean hysterectomy. Materials and methods: Nine cases and twenty controls with USG and colour Doppler diagnosed placenta accreta with previous cesarean section were chosen to utilize this novel approach. These cases were planned for elective cesarean section followed by hysterectomy. The twenty controls underwent a classical cesarean section followed by total abdominal hysterectomy with the placenta?in situ. Among the nine cases, after delivery of the fetus through upper segment cesarean section, a cotton gauze tourniquet was applied all around the lower pole of uterus. Hysterectomy was performed with placenta?in situ. Abdomen closed after achieving complete haemostasis. Results: The average operative time taken was 85 ± 11.72 minutes among cases and 98.25 ± 9.9 minutes among controls (p = 0.0039). Average blood loss was 1011.11 ± 99.3 ml among the cases and 1855 ± 222.95 ml among the controls (p ≤ 0.0001). Average requirement of blood transfusion required was two units for the cases and five units for the controls (p = 0.0002). No intra-operative or post-operative surgical complications were observed in any of the cases whereas the controls reportedly had a few. All the mothers and babies were healthy at the time of discharge. Conclusion: The presence of placenta accreta is associated with major fetal and maternal complications. The technique of tourniquet application is efficacious in minimizing the intra-operative blood loss and surgical complications due to obstruction of operative field by bleeding and also by preventing massive blood transfusion related complications.

A Seven-Step Approach to Control Severe Hemorrhage in Cesarean Delivery with the Placenta Accreta Spectrum Disorders Avoiding Hysterectomy

Objectives: To describe a novel procedure to treat hemorrhage of placenta accreta spectrum disorders (PAS) or cesarean-scar pregnancy (CSP). Methods: This was a retrospective study of women under cesarean delivery with PAS or placenta previa. Patients’ information was acquired from hospital records. A novel procedure of surgery is developed with seven major steps, including avoiding placenta incised, elevating upward the uterine, clamping the uterine arteries with sponge forceps, removing the placenta, opening the vesicouterine space and suture techniques. Results: A total of 38 patients were reviewed. Twenty-one patients diagnosed with placenta accrete syndrome and 3 patients with CSP were underwent surgery with the novel procedure of surgery and all severe hemorrhage was controlled without hysterectomy. There were 2 women with bladder injuries needing primary repair. Fourteen patients with placenta previa underwent cesarean delivery and there was no intraoperative complication of the total 14 patients. Conclusion: The seven-step approach is more secure and effective to control severe hemorrhage without other invasive procedures in cesarean delivery with PAS. It is technically easier to maintain and improve surgical skills.

Matrix Metalloproteinase-9 in the Etiopathogenesis of Placenta Accreta Spectrum:A Literature Review

The recent increase in placenta accreta spectrum has been correlated with a rise in the rate of cesarean sections.A recent study provides evidence that hampered wound healing results in cesarean scar defects that lead to a failure in the normal process of decidualization and deeper adherence of trophoblasts.Matrix metalloproteinase(MMP)is crucial in every step of wound healing as it alters the wound matrix,facilitating cell migration,as well as tissue remodeling.MMP-9 expression is higher in placental and decidual tissue in cases of placenta accreta.Based on these findings,assessment of MMP-9 expression can shed new light on the etiopathology of placenta accreta spectrum disorder and can be a potential diagnostic marker.

The Evolution of Management Strategies for Placenta Accreta Spectrum

To editor:The disorders associated with placenta accreta spectrum(PAS)are potentially severe obstetric complications that should be managed by expert centers with substantial re-sources to provide both preoperative and intraoperative as-sessments and then prearrange a multidisciplinary team with an appropriate delivery plan.Placenta accreta spectrum was first described in 1937 as“attempts to remove the pla-centa led to major postpartum hemorrhage that required emergency or secondary hysterectomy to control bleeding.”1 In 1966,Luke et al-classified this condition into placenta creta(or vera,adherenta),increta,and perceta based on the depth of placenta villi adhesion or invasion,as determined by pathological features.Although infrequent,there have been significant advances in the global evolution of the strat-egies used to manage PAS,especially over the last decade.

High Risk Factors for Placenta Accreta Other than Pregnancy and Their Impact on Patient Prognosis

Objective This study aimed to determine the most pertinent factors responsible for placenta accreta spectrum disorders in patients without any history of pregnancy and evaluate their prognostic implications.Methods This retrospective cohort study included 1009 patients diagnosed with placenta accreta spectrum disorders based on standardized diagnostic criteria across 10 tertiary hospitals in China between January 1,2018,and December 31,2018;45 patients without a history of pregnancy were selected.The collected data mainly included demographic characteristics(including age,operative history,and ultrasound findings)and maternal-fetal outcomes(including any history of intraoperative bleeding,blood transfusion details,maternal-fetal complications,and fetal Apgar scores).SPSS 24.0 was used for statistical analyses.The Mann-Whitney U test and logistic regression were performed;a two-tailed P<0.050 was considered statistically significant.Results Ultrasound-based detection of placenta previa(χ^(2)=9.911,P=0.003)showed a strong association with placenta accreta spectrum types.The severity of placenta accreta spectrum was directly proportional to the likelihood of having coexistent complete placenta previa(χ^(2)=11.626,P=0.009)and being diagnosed by ultrasound(χ^(2)=5.449,P=0.047).Blood transfusion also impacted placenta accreta spectrum types in relation to maternal prognosis(χ^(2)=8.785,P=0.004).On univariate analysis,older age led to more complications(U=82.000,P=0.011),and in vitro fertilization-embryo transfer caused more intraoperative bleeding(U=91.500,P=0.007).Although the 1-and 5-minute Apgar scores were statistically significant,the rates of neonatal asphyxia did not differ(P>0.050).Endometrial damage led to lower Apgar scores on both univariate(1 minute:U=29.500,P=0.027;and 5 minutes:U=33.500,P=0.031)and multivariate(1 minute:β=−1.510,95%confidence interval,−2.639 to 0.381,P=0.010;and 5 minutes:β=−0.968,95%confidence interval,−1.779 to 0.157,P=0.021)analyses.Conclusion In patients who had no history of pregnancy,placenta previa was a strong risk factor for severe placenta accreta spectrum disorders.Endometrial damage led to lower Apgar scores;this warrants greater consideration in the clinic.

残角子宫妊娠至34+周合并胎盘植入1例分析

目的探讨残角子宫妊娠的妊娠机制、临床诊断及处理,分析误诊原因。方法总结甘肃省妇幼保健院产科2021年7月收治的1例残角子宫妊娠至34+周并发胎盘植入病人的病史资料及诊疗方案,做文献复习。结果孕妇主诉停经34^(+)周,产检发现前置胎盘5 d。入院主要诊断“残角子宫妊娠,胎盘植入,孕34^(+)周,孕2产1”。入院后完善相关检查,行手术治疗,术中明确残角子宫妊娠合并胎盘植入,娩出胎儿后,切除残角子宫。分析误诊原因:未定期检查,中孕期未能分辨宫腔与宫颈的关系,病人有经阴道分娩史,故误诊为正常宫腔妊娠。中孕期检查如发现妊娠子宫位置较高,应充分扫查盆腔有无单角子宫存在,妊娠子宫与宫颈有无相连,有助于残角子宫妊娠漏诊的发现,MRI辅助检查在中晚孕期能提高残角子宫妊娠诊断的准确率。结论孕期需要加强监测及管理,仔细询问病史,详细专科查体,提高早期诊断率,降低母婴不良事件的发生。

止血囊与纱条填塞分别联合腹主动脉临时阻断术应用于伴胎盘植入孕妇剖宫产术中止血的价值

目的:探讨止血囊与纱条填塞分别联合腹主动脉临时阻断术用于伴胎盘植入孕妇剖宫产术中止血的价值。方法:回顾性分析伴胎盘植入且有意愿保留子宫的185例孕妇的临床资料,按照手术止血方法不同分为止血囊组(n=92)和纱条组(n=93)。对比两组手术相关指标(腹主动脉临时阻断时间、止血成功率、填塞物脱落率、填塞时间)、围术期出血量、纤维蛋白原(FIB)、凝血酶原时间(PT)、活化部分凝血酶原时间(APTT),统计并发症总发生率。结果:止血囊组腹主动脉临时阻断时间和填塞时间短于纱条组(P<0.05),术中及术后2、24 h出血量均少于纱条组(P<0.05),止血成功率高于纱条组(P<0.05),填塞物脱落率和术后并发症总发生率均低于纱条组(P<0.05),术后24 h FIB高于纱条组(P<0.05),PT和APTT低于纱条组(P<0.05)。结论:腹主动脉临时阻断术联合止血囊以及纱条均可有效改善伴胎盘植入剖宫产术中出血,止血囊成功率和安全性更高。

子宫动脉结扎联合腹主动脉球囊阻断术在胎盘植入性疾病剖宫产术中的应用

目的 :探讨子宫动脉结扎联合腹主动脉球囊阻断术在胎盘植入性疾病(placenta accreta spectrum disorders,PAS)剖宫产术中的有效性和有安全性。方法 :将83例PAS剖宫产产妇随机分为观察组(n=42)和对照组(n=41)。对照组给予腹主动脉球囊阻断剖宫产术,观察组给予子宫动脉结扎联合腹主动脉球囊阻断剖宫产术。比较2组手术相关指标和并发症。结果 :观察组手术时间长于对照组,术中出血量、术后24 h总出血量少于对照组,术后血红蛋白差值小于对照组(均P <0.05),并发症发生率低于对照组(4.76%vs 19.51%,χ^(2)=4.260,P=0.028)。结论 :子宫动脉结扎联合腹主动脉球囊阻断术有助于降低PAS剖宫产产妇术中及术后出血量,减少产后出血等并发症的发生。

Posterior Placenta Accreta Spectrum Disorders:Risk Factors,Diagnostic Accuracy,and Surgical Management

Posterior placenta accreta spectrum(PAS)disorders are infrequent but potentially associated with significant maternal mortality and morbidity,especially if not diagnosed prenatally.Analysis of published literature is problematic since most experiences included only a few cases.Knowledge of the risk factors associated with posterior PAS is crucial to identifying mothers at higher risk and ask for high sensitivity studies.Ultrasound has poor diagnostic accuracy in detecting posterior PAS,while magnetic resonance imaging better delineates the posterior uterine wall.In comparison,prenatal imaging’s diagnostic performance in detecting posterior PAS is significantly lower than anterior placenta invasion.Management of posterior PAS depends on several factors,including maternal hemodynamic status,available resources,clinical presentation,and invasion severity.For accreta or increta cases,a compression suture is habitually enough to perform hemostasis.Nevertheless,organ involvement habitually requires a multidisciplinary team with the assistant of a general or coloproctology surgeon.The present article aims to update the risk factors,prenatal diagnosis,and surgical management of pregnancies complicated by posterior PAS.

LncRNA SNHG8在胎盘植入的表达及其对滋养细胞侵袭及迁移的影响

目的 探讨lncRNA SNHG8在胎盘植入(placenta accreta,PA)中的表达及对滋养细胞侵袭迁移的影响。方法 采用q RT-PCR检测PA组及对照组各30例胎盘组织中lncRNA SNHG8的表达,同时与30例PA患者产前超声评分做相关性分析。采用Transwell和划痕实验检测干扰lncRNA SNHG8后对人绒毛膜滋养层细胞(HTR8/SVneo cells)侵袭和迁移的影响,同时,Western blot检测MMP-2和MMP-9的表达情况;StarBase软件预测lncRNA SNHG8下游靶点,并在两组胎盘组织中检测其表达;双荧光素酶报告实验检测lncRNA SNHG8与miR-542-3p的靶向关系。结果 与对照组比较,lncRNA SNHG8在胎盘植入组胎盘组织中表达上调(P <0.05),并与产前超声评分呈正相关。干扰lncRNA SNHG8后抑制了滋养细胞的侵袭迁移(P <0.05),MMP-2及MMP-9蛋白表达也明显下降(P <0.05)。生物学预测miR-542-3p存在与lncRNA SNHG8的结合位点,miR-542-3p在PA胎盘组织中表达下调(P <0.05),双荧光素酶报告实验证实lncRNA SNHG8能靶向调控miR-542-3p。共转染si-SNHG8与miR-542-3p inhibitor后,与si-SNHG8+inhibitor-NC相比,滋养细胞侵袭迁移能力增强(P <0.05)。结论 lncRNA SNHG8在PA胎盘组织中高表达并与其严重程度相关,lncRNA SNHG8通过调节miR-542-3p水平促进滋养细胞侵袭迁移行为学功能,提示lncRNA SNHG8在PA滋养细胞的侵袭迁移中发挥重要作用,有望成为临床诊断生物标记物和治疗靶点。

基于磁共振T2WI影像组学模型对胎盘植入性疾病进行产前诊断及分型

目的探讨基于磁共振T2WI的影像组学模型在产前预测胎盘植入性疾病(placenta accreta spectrum disorders,PAS)及其亚型的应用价值。材料与方法回顾性分析了2018年1月至2023年1月在北京妇产医院住院分娩的193例单胎妊娠孕妇数据,其中PAS 134例,非PAS 59例,所有患者根据同一分型的总数按2∶1的比例随机划分为训练集和测试集。在T2WI序列图像提取影像组学特征,Pearson相关系数和最小绝对收缩和选择算子(least absolute shrinkage and selection operator,LASSO)回归用于特征筛选,基于筛选后的特征构建PAS预测模型。然后,计算便于临床应用的影像组学评分评估PAS分型,使用单因素分析与多因素分析进一步分析其他潜在的临床危险因素,包括年龄、孕周、此前孕次、此前产次、此前剖宫产次数、胎盘问题(前置胎盘)和既往子宫手术史,选择临床主要风险因素建立基于影像组学评分和临床特征的临床-影像组学模型并绘制诺莫图。通过受试者工作特征(receiver operating characteristic,ROC)曲线下面积(area under the curve,AUC)评估模型的预测性能,采用DeLong检验比较模型间的预测效能,校准曲线用于评估预测模型的校准程度,决策曲线用于评估预测模型临床价值。结果在T2WI序列图像上提取了806个影像组学特征,经过Pearson相关分析后保留147个影像组学特征,经LASSO回归处理后筛选出10个影像组学特征,基于影像组学特征构建影像组学模型。影像组学模型的训练集AUC值为0.933(95%CI:0.888~0.978),准确率为88.37%,敏感度为88.78%,特异度为87.10%,阳性预测值(positive predictive value,PPV)为95.60%,阴性预测值(negative predictive value,NPV)为71.05%;测试集AUC值为0.914(95%CI:0.835~0.993),准确率为89.06%,敏感度为90.91%,特异度为85.00%,PPV为90.00%,NPV为80.95%。校准曲线和决策曲线表明模型具有较高性能和潜在临床应用价值。影像组学评分对穿透性胎盘植入具有较强的识别能力,训练集和测试集准确率分别为82.95%、89.06%,敏感度和NPV在训练集和测试集都达到了100.00%,特异度分别为81.35%、88.33%。同时,本研究成功构建了临床-影像组学模型并绘制诺莫图用于可视化预测患者的PAS,训练集中临床-影像组学模型的AUC值为0.969(95%CI:0.946~0.993),测试集中AUC值为0.976(95%CI:0.947~1.000)。DeLong检验测试结果表明两模型性能存在显著性差异(P<0.05),临床-影像组学模型具有更好的性能表现。结论基于临床特征及影像组学评分构建的临床-影像组学模型预测效能较好,可作为产前预测是否存在PAS的方法。且影像组学评分对PAS亚型具有较好的鉴别能力,尤其是对于穿透性胎盘植入。