简介：AbstractThe obstetric issues and management styles in China are different from that in Western countries. Chinese medical education, residency training, obstetric care structure, and management of common obstetric complications are briefly reviewed and compared to the United States. Maternal-fetal medicine (MFM) is rapidly developing in China, but the development of MFM may not follow the same trajectory as in the West. Understanding the difference between China and the West may facilitate communication and foster mutual development.

简介：AbstractThe maternal-fetal interface is a key barrier to protect the fetus from infection. Toll-like receptors (TLRs) at the maternal-fetal interface are involved in antiviral responses. TLRs are expressed in both maternal decidua and fetal trophoblasts. Virus-induced activation of TLR signaling pathways triggers the release of interferon-related antiviral molecules and other inflammatory cytokines and/or chemokines by the host innate immune system, which may disrupt immune tolerance at the maternal-fetal interface and lead to pregnancy complications. In this review, we summarize the state of knowledge on the most common viral infections during pregnancy, antiviral TLR responses at the maternal-fetal interface, and TLR-associated pregnancy complications.

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简介：Abstract2019 novel coronavirus disease has resulted in thousands of critically ill patients in China, which is a serious threat to people’s life and health. Severe acute respiratory syndrome-coronavirus 2 (SARS-CoV-2) was reported to share the same receptor, angiotensin-converting enzyme 2 (ACE2), with SARS-CoV. Here, based on the public single-cell RNA-sequencing database, we analyzed the mRNA expression profile of putative receptor ACE2 and AXL receptor tyrosine kinase (AXL) in the early maternal-fetal interface. The result indicates that the ACE2 has very low expression in the different cell types of early maternal-fetal interface, except slightly high in decidual perivascular cells cluster 1 (PV1). Interestingly, we found that the Zika virus (ZIKV) receptor AXL expression is concentrated in perivascular cells and stromal cells, indicating that there are relatively more AXL-expressing cells in the early maternal-fetal interface. This study provides a possible infection route and mechanism for the SARS-CoV-2- or ZIKV-infected mother-to-fetus transmission disease, which could be informative for future therapeutic strategy development.

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简介：AbstractThis paper provides ethical guidance for the professionally responsible clinical investigation of maternal-fetal investigation for fetal or neonatal benefit and its transition into clinical practice. We present an ethical framework based on the ethical principles of beneficence, respect for autonomy, and justice, the professional virtue of integrity, and the ethical concept of the fetus as a patient. We identify the implications of this ethical framework for the qualifications that centers for maternal-fetal intervention should satisfy. These centers have the ethical obligation to provide prospective review and oversight of both innovation (an experiment undertaken to benefit an individual patient) and research (an experiment undertaken to create generalizable knowledge). We describe ethically justified criteria for innovation and early-phase research, for randomized clinical trials, and for the responsible transition into clinical practice. We also identify the elements of the informed consent process, including measures to prevent therapeutic misconception by pregnant patients during the informed consent process. The scientific, clinical, and ethical requirements of maternal-fetal investigation are demanding. However, the commitment to safety and quality requires that they be met. Fulfilling this commitment will result in well-documented professionally responsible investigation of maternal-fetal intervention for fetal and neonatal benefit.

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简介：AbstractVenous thromboembolism (VTE) is a leading cause of maternal morbidity and mortality though with low rates. Compared to non-pregnant women of comparable age, women during pregnancy have five- to ten-fold increased risk of VTE, additional risk factors for VTE during pregnancy include a personal history of thrombosis, the presence of a thrombophilia, cesarean delivery, obesity, hypertension, preeclampsia, autoimmune disease, heart disease, sickle cell disease and multiple gestation. Thus, early clinical evaluation, preferably in peri-conceptional period, is crucial for VTE risk detection and, thus, for prophylaxis decision making. VTE thromboprophylaxis brought significant advantages in pregnancy outcomes and maternal deaths. Common pharmacological and mechanical forms of thromboprophylaxis includes heparin compounds, anti-embolic stockings and intermittent pneumatic compression devices. Low-molecular-weight heparin as first line strategy. Current guidelines or expert opinions on VTE treatment or prophylaxis during pregnancy diverge significantly. High quality research in this area is still needed, and China needs to develop its own VTE guidelines. Importantly, absolute risks and potential benefits of VTE thromboprophylaxis should be evaluated to make the best decisions on VTE screening, prevention, and treatment.

简介：在母亲/胎儿的接口的Th2偏爱的规章的机制仍然保持不清楚。在这研究，我们在蜕膜的stromal描绘了cytokine生产房间(DSC)，蜕膜的有免疫力的房间(DIC)和导出胚胎的trophoblast房间，并且在早人的怀孕在母亲/胎儿的接口在Th2偏爱上调查了CXCL12/CXCR4相互作用的规定。我们由trophoblasts，DSC和DIC发现了Th1类型和Th2类型cytokines的微分生产。这些cytokines的分泌物在不同房间cocultures变化了，导致了到Th2偏爱。流动cytometry与DSC显示出trophoblasts的那coculture，DIC显著地在DSC在trophoblasts，和IL-10生产增加了IL-4和IL-10生产。然而，有DSC和DIC的trophoblasts的coculture显著地增加了干扰素(IFN)-γ；在DSC，和肿瘤坏死因素(TNF)-α的表示；在DIC的表示。没有变化在所有cocultures在DIC在trophoblasts，并且在Th2类型cytokine生产在Th1类型cytokine生产被看见。而且，有抵销抗体upregulated的anti-CXCR4的预告的处理Th1类型cytokinesIFN-γ的生产；并且TNF-α；，并且downregulatedTh2类型cytokinesIL-4和IL-10的生产在trophoblasts，DSC，DIC或他们的cocultures。有趣地，rhCXCL12禁止了Th1类型cytokineTNF-α的生产；并且在DIC提高了象IL-4和IL-10那样的Th2类型cytokines的表示；这效果被anti-CXCR4抗体废除。我们的现在的学习阐明了到塑造Th2的部件房间的单个贡献偏导，并且揭开经由在在早人的怀孕的母亲/胎儿的接口的CXCL12/CXCR4信号的复杂串音。

简介：AbstractGestational diabetes mellitus (GDM) is a well-established risk factor for fetal macrosomia. A significant number of patients with GDM also suffer from obesity, a factor associated with fetal macrosomia. An important question is whether GDM is independently associated with fetal macrosomia, or whether this relationship is merely the result of maternal obesity acting as a confounder. In this review of the literature, we attempt to further elucidate the relationship between GDM, maternal obesity, and fetal macrosomia.

简介：AbstractViral infections during pregnancy are associated with adverse pregnancy outcomes, including maternal and fetal mortality, pregnancy loss, premature labor, and congenital anomalies. Mammalian gestation encounters an immunological paradox wherein the placenta balances the tolerance of an allogeneic fetus with protection against pathogens. Viruses cannot easily transmit from mother to fetus due to physical and immunological barriers at the maternal-fetal interface posing a restricted threat to the fetus and newborns. Despite this, the unknown strategies utilized by certain viruses could weaken the placental barrier to trigger severe maternal and fetal health issues especially through vertical transmission, which was not fully understood until now. In this review, we summarize diverse aspects of the major viral infections relevant to pregnancy, including the characteristics of pathogenesis, related maternal-fetal complications, and the underlying molecular and cellular mechanisms of vertical transmission. We highlight the fundamental signatures of complex placental defense mechanisms, which will prepare us to fight the next emerging and re-emerging infectious disease in the pregnancy population.

简介：摘要Background and objectiveCloser monitoring and treatment is vital for pregnant carbon monoxide (CO) poisoning cases due to fetal poisoning component. Permanent damage can occur in both the mother and the baby. It may cause stillbirth even though no serious clinical symptoms occur in the mother. Hyperbaric oxygen (HBO) treatment is advised for all pregnant patients regardless of their clinical symptoms. Pregnant CO poisoning patients that received HBO treatment and their fetal status were evaluated in this study.MethodsPregnant patients poisoned with CO treated in the same hyperbaric clinic were evaluated. Pregnant patients that received HBO treatment in a multiplace chamber were evaluated in terms of clinical status, demographic structure, laboratory tests, fetal effects and progress of the fetus until birth and 6 months postpartum.ResultsA total number of 32 pregnant cases were treated. COHb values were over 20% (min 6.9- max 40.2) in 23 patients, 11 patients had a history of syncope. All patients took HBO treatment under 2.4 ATA pressure for 120 min. 3 patients received more than 1 session of HBO treatments due to fetal stress; all other cases took 1 session of HBO treatment. No spontaneous abortus occurred in early follow-ups; only 4 babies were born prematurely. 2 of the babies were lost in the early phases after birth, due to causes non-related to CO poisoning complications (cyanotic heart disease, necrotizing enterocolitis). No significant difference were observed in the comparison of laboratory results of patients with syncope and of those who did not have syncope and comparison of patients with COHb value higher than 20% and patients with COHb value lower than 20% (P>0.05)．ConclusionHBO is not advisable for pregnant patients except for CO poisoning. In this study it is observed that HBO treatment under 2.4 ATA pressure for 120 min has no harmful effects on the mother and the fetus. It is observed that continuation of HBO treatment in the cases with fetal distress findings has beneficial effects. COHb levels and syncope were shown to have no significant effect on clinical symptoms and on blood tests.

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简介：AbstractObjective:To build a reference fetal growth chart for the Chinese population based on fetal ultrasound measurements.Methods:This was a multicenter, population-based retrospective cohort study. Longitudinal ultrasound measurement data were collected from 24 hospitals in 18 provinces of China from 1st September through 31st October of 2019. The estimated fetal weight (EFW) was calculated based on head circumference, abdominal circumference, and femur length using Hadlock formula 3. Fetal growth curves were estimated using a two-level linear regression model with cubic splines. All participants were divided into two groups: the northern group (n = 5829) and the southern group (n = 3246) based on the geographical division of China and male fetus group (n = 4775) and female fetus group (n = 4300) based on fetal gender. The EFW was compared by fetal gender and geographical group. All statistical models were adjusted for maternal sociodemographic characteristics.Results:A total of 9075 participants with 31,700 ultrasound measurement records were included in this study. Male fetuses demonstrated significantly larger EFW compared to female ones starting at 16 weeks of gestation and extending to delivery (global test P < 0.01). The overall geographic difference in EFW was significant (global test P = 0.03), and week-specific comparisons showed that the northern group had a greater EFW starting at 15 weeks of gestation and extending to 29 weeks of gestation, although this difference did not extend to the time of delivery. The Z-score of EFW confirmed that our Chinese fetal growth charts differed from previously published standards.Conclusion:This study provides EFW and ultrasound biometric reference measurements for Chinese fetuses and reveals differences from other fetal growth charts. The chart is worth promoting in more regions of China but should be tested prudently before use.

简介：在这份报纸，我们为与不连续的系数解决弹性问题与错误控制建议适应有限元素方法。在方法的网孔不需要适合接口。我们建立一基于剩余是独立趋于增加的常数的posteriori错误估计；Lam????D

简介：Athena,theSoftwareFrameworkforATLAS'offlinesoftwareisbasedontheGaudiFrameworkfromLHCb^1,TheProcessingModelofGaudiisessentiallythatofabatch-orientedsystem-aUserpreparesafiledetailingtheconfigurationofwhichAlgorithmsaretobeappliedtotheinputdataofajobandtheparametervaluesthatcontrolthebehaviorofeachAlgorithminstance.TheFrameworkthenreadsthatfileonceatthebeginningofajobandrunstocompletionwithnofurtherinteractionwiththeUser.WehaveenhancedtheProcessingModeltoincludeaninteractivemodewhereaUsercancotroltheeventloopofarunningjobandmodifytheAlgorithmsandparametersonthefly.WechangedonlyaverysmallnumberofGaudiClassestoprovideaccesstoparametersfromanembeddedPythoninterpreter,NochangewasmadetotheGaudiProgrammingModel.i.e.,developersneednotchangeanythingtomakeuseofthisaddedinterface,WepresentdetailsofthedesignandimplementationoftheinteractivePythoninterfaceforAthena.

简介：AnewmechanicsmodelbasedonPeierlsconceptispresentedinthispaper,whichcanclearlycharacterizetheintrinsicfeaturesnearatipofaninterfacialcrack.Thestressanddisplacementfieldsarecalculatedundergeneralcombinedten-sileandshearloadings.Theneartipstressfieldsshowsomeoscillatorybehaviorsbutwithoutanysingularityandthecrackfacesopencompletelywithoutanyoverlappingwhenremotetensileloadingiscomparablewithremoteshearloading.Afracturecriterionforpredictinginterfacetoughnesshasbeenalsoproposed,whichtakesintoaccountfortheshieldingeffectsofemitteddislocations.Thetheoreticaltoughnesscurvegivesexcellentprediction,ascomparedwiththeexistingexperimentdata.

简介：Theuser-computerinterfaceforcolorselectionisofgreatsignificancefortheuseofcolorsincomputergraphics,particularlyinsomefieldswheretheusedcolorshavetobeselectedcarefully.Thispaperdiscusseswhatfactorshavetobeconsideredtodesignaneffectiveuserinterfaceforcolorselec-tion.Italsopresentsamethodwhichshowshowtorepresent3Dcolorspacesaccordingtothepsychol-ogyofcolorperception.Twoexamplesofuserinterfaceforcolorselectionaregiven.OneisbasedontheCLELUVuniformcolorspace,theotherisbasedonRGB-rotatedcolormodel.

简介：Inthispaper,aclassofnewimmersedinterfacefiniteelementmethods(IIFEM)isdevelopedtosolveelasticityinterfaceproblemswithhomogeneousandnon-homogeneousjumpconditionsintwodimensions.Simplenon-body-fittedmeshesareused.Forhomogeneousjumpconditions,bothnon-conformingandconformingbasisfunctionsareconstructedinsuchawaythattheysatisfythenaturaljumpconditions.Fornon-homogeneousjumpconditions,apairoffunctionsthatsatisfythesamenon-homogeneousjumpconditionsareconstructedusingalevel-setrepresentationoftheinterface.Withsuchapairoffunctions,thediscontinuitiesacrosstheinterfaceinthesolutionandfluxareremoved;andanequivalentelasticityinterfaceproblemwithhomogeneousjumpconditionsisformulated.Numericalexamplesarepresentedtodemonstratethatsuchmethodshavesecondorderconvergence.

简介：AbstractFetal growth restriction (FGR) has a prevalence of about 10% worldwide and is associated with an increased risk of perinatal mortality and morbidity. FGR is commonly caused by placental insufficiency and can begin early (<32 weeks) or in late (≥32 weeks) gestational age. A false positive antenatal diagnosis may lead to unnecessary monitoring and interventions, as well as cause maternal anxiety. Whereas a false negative diagnosis exposes the fetus to an increased risk of stillbirth and renders the pregnancy ineligible from the appropriate care and potential treatments. The clinical management of FGR pregnancies faces a complex challenge of deciding on the optimal timing of delivery as currently the main solution is to deliver the baby early, but iatrogenic preterm delivery of infants is associated with adverse short-and long-term outcomes. Early and accurate diagnosis of FGR could aid in better stratification of clinical management, and the development and implementation of treatment options, ultimately benefiting clinical care and potentially improving both short-and long-term health outcomes. The aim of this review is to present the new insights on biomarkers of placenta insufficiency, including their current and potential value of biomarkers in the prediction and prevention for FGR, and highlight the association between biomarkers and adverse outcomes in utero to explore the specific mechanism of impaired fetal growth that establish the basis for disease later in life.