BACKGROUND & AIMS: The expression of GABA in the human fetal (12-25 weeks of gestation), postnatal (five-month-old), and adult (35-year-old) retinas was investigated by immunohistochemistry. GABA expression was seen as early as 12 weeks in the undifferentiated cells of the inner neuroblast zone; a few optic nerve fiber layer axons were clearly labeled, suggesting that some of the stained cell bodies were prospective ganglion cells, others could be displaced amacrine cells. From 16-17 to 24-25 weeks, intense labeling was found in the amacrine, displaced amacrine, and some ganglion cells. During this time period, horizontal cells (identified by calbindin immunohistochemistry), undergoing migration (periphery) and differentiation (center), expressed GABA prominently. In the postnatal retina, some horizontal cells were moderately labeled, but very weakly in a few cells, in the adult. The Müller cells developed immunoreactivity first weakly at 12 weeks and then moderately from 16-17 weeks onward. The staining was also evident in the postnatal and adult retinas, showing labeled processes of these glial cells. Virtually no axons in the adult optic nerve and nerve fiber layer were stained; the staining was restricted to a few, large ganglion cells and displaced amacrine cellsSome amacrines were also labeled. The possibility that GABA might play a role in horizontal cell differentiation and maturation is highlighted. Other evidences suggest that GABA might play a role in metabolism during retinal development.

背景与目标： 通过免疫组织化学研究了GABA在人类胎儿 (妊娠12-25周)，产后 (5个月大) 和成人 (35岁) 视网膜中的表达。早在12周内在神经母细胞区的未分化细胞中就看到了GABA的表达; 清晰地标记了一些视神经纤维层轴突，这表明一些染色的细胞体是潜在的神经节细胞，另一些可能是置换的无长突细胞。从16-17到24-25周，在无长突，移位的无长突和一些神经节细胞中发现了强烈的标记。在此期间，水平细胞 (通过钙结合蛋白免疫组织化学鉴定) 经历了迁移 (外围) 和分化 (中心)，显着表达GABA。在成年后的视网膜中，一些水平细胞被适度标记，但在少数细胞中却非常弱。M ü ller细胞首先在12周时出现免疫反应性，然后从16-17周开始适度发展。在产后和成年视网膜中，染色也很明显，显示了这些神经胶质细胞的标记过程。成人视神经和神经纤维层中几乎没有轴突被染色; 染色仅限于少数大神经节细胞和移位的无长突细胞，还标记了一些无长突。强调了GABA可能在水平细胞分化和成熟中起作用的可能性。其他证据表明，GABA可能在视网膜发育过程中发挥代谢作用。

BACKGROUND & AIMS: :Bioelectrical fetal heart activity being recorded from maternal abdominal surface contains more information than mechanical heart activity measurement based on the Doppler ultrasound signals. However, it requires extraction of fetal electrocardiogram from abdominal signals where the maternal electrocardiogram is dominant. The simplest technique for maternal component suppression is a blanking procedure, which relies upon the replacement of maternal QRS complexes by isoline values. Although, in case of coincidence of fetal and maternal QRS complexes, it causes a loss of information on fetal heart activity. Its influence on determination of fetal heart rate and the variability analysis depends on the sensitivity of the heart-beat detector used. The sensitivity is defined as an ability to detect the incomplete fetal QRS complex. The aim of this work was to evaluate the influence of the maternal electrocardiogram suppression method used on the reliability of FHR signal being calculated.

背景与目标： : 从母体腹部表面记录的生物电胎儿心脏活动比基于多普勒超声信号的机械心脏活动测量包含更多信息。但是，它需要从母体心电图占主导地位的腹部信号中提取胎儿心电图。抑制母体成分的最简单技术是消隐程序，该程序依赖于用等值线值代替母体QRS复合物。尽管在胎儿和母体QRS复合物重合的情况下，它会导致有关胎儿心脏活动的信息丢失。它对确定胎儿心率和变异性分析的影响取决于所使用的心跳检测器的灵敏度。敏感性定义为检测不完整胎儿QRS复合物的能力。这项工作的目的是评估所使用的母体心电图抑制方法对所计算的FHR信号可靠性的影响。

BACKGROUND & AIMS: :The prevalence of mRNAs coding for the sea urchin embryo regulatory factors P3A1 and P3A2 was measured by single-strand probe excess solution hybridization. P3A1 and P3A2 are not homologous proteins, though they both bind specifically to a particular cis-regulatory sequence. Interaction at this target site is known to be required for lineage-specific expression of an aboral ectoderm-specific gene and probably for several other genes as well. Genome blot hybridizations show that both factors are encoded by single-copy genes. Maternal mRNAs for both factors are present at less than 10(3) molecules per egg, which places them in the rare mRNA class. During development to the mesenchyme blastula stage, the amount of P3A1 mRNA (per embryo) increases severalfold while that of P3A2 remains approximately constant. Specification of the aboral ectoderm founder cells and of their initial patterns of gene expression must occur during early to mid-cleavage stage. Therefore, the regulatory proteins needed for this process must be produced by this stage. We show that the quantities of the P3A proteins that can be synthesized from the numbers of mRNA molecules present in the large blastomeres of the early embryo are sufficient to be functional, because these proteins will be accumulated in the nuclei. Thus maternal P3A1 or P3A2 proteins asre not required, nor were these detected in earlier studies. Furthermore, differential spatial (as well as temporal) distribution of both of these newly synthesized factor species could result from the unequal cleavage pattern utilized in the sea urchin egg.

背景与目标： : 通过单链探针过量溶液杂交测量编码海胆胚胎调节因子P3A1和P3A2的mrna的患病率。P3A1和P3A2不是同源蛋白，尽管它们都与特定的顺式调节序列特异性结合。已知该靶位点的相互作用对于外胚层特异性基因的谱系特异性表达以及其他几个基因也是必需的。基因组印迹杂交表明，这两个因子均由单拷贝基因编码。两种因子的母体mRNA在每个卵中存在的分子少于10(3) 个，这使它们处于稀有mRNA类别中。在发育到间充质囊胚阶段期间，P3A1 mRNA的量 (每个胚胎) 增加了几倍，而P3A2的量保持大致恒定。必须在早期至中期切割阶段对外胚层创始细胞及其基因表达的初始模式进行规范。因此，此过程所需的调节蛋白必须在此阶段产生。我们表明，可以从早期胚胎大卵裂球中存在的mRNA分子的数量合成的P3A蛋白的数量足以发挥功能，因为这些蛋白将积聚在细胞核中。因此，不需要母体P3A1或P3A2蛋白，在早期研究中也未检测到这些蛋白。此外，这两种新合成的因子物种的空间 (和时间) 分布差异可能是由于海胆卵中使用的不相等的卵裂模式造成的。

BACKGROUND & AIMS: :Medial preoptic area (MPOA) and ventral bed nucleus of the stria terminalis (VBST) neurons are involved in maternal behavior, but the neural sites to which the maternally relevant neurons project have not been determined. Since MPOA and VBST neurons express Fos during maternal behavior, we used a double-labeling immunocytochemical procedure to detect both Fos and a retrograde tracer, wheat germ agglutinin (WGA), in order to determine where these Fos neurons project. On Day 4 postpartum, fully maternal females were separated from their litters. On Day 5, WGA was iontophoretically injected into one of the following regions known to receive MPOA and/or VBST input: Lateral septum, medial hypothalamus at the level of the ventromedial nucleus, lateral habenula, ventral tegmental area, retrorubral field, or periaqueductal gray. On Day 7, females received a 2-h test with either pups or candy, after which they were perfused and their brains were processed for the detection of Fos and WGA. As expected, females tested with pups had more Fos-containing neurons in the MPOA and VBST than did females tested with candy. After WGA injections into several brain sites, the number of double-labeled cells observed in the MPOA and VBST was greater for the maternal females when compared to the non-maternal females. Therefore, these results pinpointed neural circuits that were activated during maternal behavior. For the maternal females, Fos-containing neurons in the MPOA projected most strongly to the medial hypothalamus at the level of the ventromedial nucleus and to the lateral septum, while Fos-containing neurons in the VBST projected most strongly to the retrorubral field, ventral tegmental area, and medial hypothalamus. Although relatively few MPOA and VBST neurons which expressed Fos during maternal behavior projected to the periaqueductal gray, these Fos-expressing neurons made up a relatively large proportion of the MPOA and VBST projection to the periaqueductal gray. This study suggests that MPOA and VBST efferents project to a variety of regions to promote full maternal responsiveness.

背景与目标： : 视前区 (MPOA) 和纹状体 (VBST) 神经元的腹床核参与母体行为，但尚未确定与母系相关的神经元投射到的神经部位。由于MPOA和VBST神经元在母体行为中表达Fos，因此我们使用双标记免疫细胞化学程序来检测Fos和逆行示踪剂小麦胚芽凝集素 (WGA)，以确定这些Fos神经元的投射位置。产后第4天，将完全的产妇与产仔分开。在第5天，将WGA离子电渗注射到以下已知接受MPOA和/或VBST输入的区域之一: 外侧隔膜，腹内侧核水平的下丘脑内侧，外侧habenula，腹侧被盖区，脑后野，或导水管周围灰色。在第7天，雌性接受了2小时的幼崽或糖果测试，然后对其进行灌注，并对其大脑进行处理以检测Fos和WGA。正如预期的那样，与用糖果测试的雌性相比，用幼崽测试的雌性在MPOA和VBST中具有更多的含Fos的神经元。在将WGA注射到多个大脑部位后，与非母体女性相比，在MPOA和VBST中观察到的双标记细胞数量更多。因此，这些结果确定了在母体行为期间激活的神经回路。对于母体女性，MPOA中含Fos的神经元最强烈地投射到腹内侧核水平的下丘脑内侧和外侧隔，而VBST中含Fos的神经元最强烈地投射到脑后野，腹侧被盖区和下丘脑内侧。尽管在投射到导水管周围灰色的母体行为中表达Fos的MPOA和VBST神经元相对较少，但这些表达Fos的神经元在MPOA和VBST投射到导水管周围灰色的比例相对较大。这项研究表明，MPOA和VBST传出剂投射到各个地区，以促进孕产妇的全面反应。

BACKGROUND & AIMS: :In the last few years fetal magnetic resonance imaging (MRI) has been proposed as a second level technique in the evaluation of fetal brain anomalies. It has been demonstrated that MRI is highly accurate in illustrating the morphologic changes of developing brain and fetal brain abnormalities being a useful procedure when ultrasonography is inconclusive or doubtful. Starting from the 19-20 weeks gestational age (GA), MRI can reliably depict fetal brain anatomy and locating pathology, offering a robust and reliable tool in the assessment of fetal CNS diseases. In this review both in vivo MRI quantitative and qualitative data about fetal cerebellar development are presented and compared with ultrasonography data. Fetal cerebellar development is gradual, steady, and largely comparable to the development of the supratentorial brain. Archicerebellar (flocculo-nodular lobe) and paleocerebellar (vermis) structures develop first, whereas neocerebellum (cerebellar hemispheres) develop slowly and largely after birth.

背景与目标： : 在过去的几年中，胎儿磁共振成像 (MRI) 已被提议作为评估胎儿大脑异常的第二级技术。已经证明，当超声检查不确定或可疑时，MRI在说明发育中的大脑和胎儿大脑异常的形态变化方面非常准确，这是一种有用的方法。从19-20周的胎龄 (GA) 开始，MRI可以可靠地描述胎儿的大脑解剖结构和定位病理，为评估胎儿中枢神经系统疾病提供了可靠可靠的工具。在这篇综述中，介绍了有关胎儿小脑发育的体内MRI定量和定性数据，并将其与超声检查数据进行了比较。胎儿小脑的发育是渐进的，稳定的，并且在很大程度上与幕上大脑的发育相当。小脑 (小脑结节叶) 和古小脑 (ver) 结构首先发育，而新脑 (小脑半球) 在出生后缓慢且大部分发育。

BACKGROUND & AIMS: :Female mice deficient in steroid 5alpha-reductase type 1 have a decreased litter size. The average litter in homozygous deficient females is 2.7 pups vs. 8.0 pups in wild type controls. Oogenesis, fertilization, implantation, and placental morphology appear normal in the mutant animals. Fetal loss occurs between gestation days 10.75 and 11.0 commensurate with a midpregnancy surge in placental androgen production and an induction of 5alpha-reductase type 1 expression in the decidua of wild type mice. Plasma levels of androstenedione and testosterone are 2- to 3-fold higher on gestation day 9, and estradiol levels are chronically elevated by 2- to 3-fold throughout early and midgestation in the knockout mice. Administration of an estrogen receptor antagonist or inhibitors of aromatase reverse the high rate of fetal death in the mutant mice, and estradiol treatment of wild type pregnant mice causes fetal wastage. The results suggest that in the deficient mice, a failure to 5alpha-reduce androgens leads to their conversion to estrogens, which in turn causes fetal death in midgestation. These findings indicate that the 5alpha-reduction of androgens in female animals plays a crucial role in guarding against estrogen toxicity during pregnancy.

背景与目标： : 缺乏类固醇5α-还原酶1型的雌性小鼠的产仔数减少。纯合缺陷雌性的平均产仔为2.7幼仔，而野生型对照为8.0幼仔。在突变动物中，卵子发生，受精，植入和胎盘形态似乎正常。胎儿损失发生在妊娠10.75和11.0之间，与妊娠中期胎盘雄激素产生激增和野生型小鼠蜕膜中5α-还原酶1型表达的诱导相称。在妊娠第9天，雄烯二酮和睾丸激素的血浆水平高2至3倍，在整个妊娠早期和中期，敲除小鼠的雌二醇水平长期升高2至3倍。施用雌激素受体拮抗剂或芳香化酶抑制剂可逆转突变小鼠的高胎儿死亡率，而雌二醇处理野生型妊娠小鼠会导致胎儿浪费。结果表明，在缺陷小鼠中，未能减少5α-雄激素会导致其转化为雌激素，进而导致妊娠中期胎儿死亡。这些发现表明，雌性动物中雄激素的5α 减少在预防怀孕期间的雌激素毒性中起着至关重要的作用。

BACKGROUND & AIMS: UNLABELLED:A Methodical Study:

AIM OF THE STUDY:To analyse the feasibility of colour and spectral Doppler assessment of blood flow in the fetal right (RPA) and left (LPA) main pulmonary arteries in relation to fetal position and to gestational age.

STUDY DESIGN:The fetal position was a priori divided into 3 types, depending on whether the fetal heart was visualised apically (Type 1), from the right side (Type 2) or from the left side (Type 3). Three groups A (19-25 weeks gestation), B (26-32) and C (33-39) including 33 consecutive pregnancies each, were examined to document the fetal position as well as the rate of the successful Doppler examinations of the RPA and/or LPA.

RESULTS:The fetal position Type 2 was most common throughout gestation (in group A = 42%, B = 36%, C = 51%) followed by the type 3 and then type 1. The rate of successful Doppler records from the RPA and LPA depended on the fetal position: In Type 2 RPA in 98%; in Type 3, LPA in 100%; but the apical approach was not effective (< 40%). Depending on gestational age, the success rates for a Doppler examination of at least one vessel were high (> 85%), whereas successful examination of both vessels was unlikely (12%).

CONCLUSIONS:In the second half of pregnancy, independent of fetal position, Doppler examination of at least one pulmonary artery is successful in most cases, whereas the assessment of both vessels is rather difficult.

背景与目标： 未标记 : 有条不紊的研究:
研究的目的 : 分析彩色和频谱多普勒评估胎儿右 (RPA) 和左 (LPA) 主肺动脉血流与胎儿位置和胎龄的可行性。
研究设计 : 根据胎儿心脏是从右侧 (2型) 还是从左侧 (3型) 可视化，先验地将胎儿位置分为3种类型。A组 (妊娠19-25周)，B组 (26-32) 和C组 (33-39)，每组33次连续怀孕，检查以记录胎儿位置以及RPA和/或LPA的成功多普勒检查率。
结果 : 2型胎儿位置在整个妊娠期间最常见 (A组 = 42%，B = 36%，C = 51%) 接着是类型3，然后是类型1。来自RPA和LPA的成功多普勒记录的速率取决于胎儿位置: 在2型RPA中98%; 在3型中，在100% 中LPA; 但是根尖方法无效 (< 40%)。根据胎龄的不同，对至少一个血管进行多普勒检查的成功率很高 (> 85%)，而对两个血管的成功检查不太可能 (12%)。
结论 : 在怀孕的后半段，在大多数情况下，独立于胎儿位置，对至少一条肺动脉进行多普勒检查是成功的，而对两条血管的评估相当困难。

BACKGROUND & AIMS: The accuracy of cervicovaginal fetal fibronectin as a predictor of preterm birth was studied in patients with increased risk for preterm delivery (according to the Creasy-score). In a prospective blind observational study the smear from the posterior fornix vaginae of 56 pregnant patients without PROM was examined using a quantitative immunoassay for the detection of fetal fibronectin. The patients who tested positively for fetal fibronectin had significantly more preterm deliveries than those with a negative result (CHI square-test, p < 0.01, RR 5.1). Overall, sensitivity, specificity, positive and negative predictive values were 56%, 87%, 45% and 91%, respectively. In patients with preterm labor these values were 75%, 87%, 60%, and 93%, respectively. No patient with a negative result delivered preterm during the following two weeks. It is concluded that performing the fetal fibronectin test in patients with preterm labor is useful for the prediction of preterm birth. Routine testing in patients at increased risk (asymptomatic patients) is not recommended for lack of effectiveness.

背景与目标： 在早产风险增加的患者中研究了宫颈阴道胎儿纤维连接蛋白作为早产预测指标的准确性 (根据Creasy评分)。在一项前瞻性盲观察研究中，使用定量免疫测定法检查了56例无胎膜早破的孕妇的后穹窿阴道涂片，以检测胎儿纤连蛋白。胎儿纤连蛋白检测呈阳性的患者的早产明显多于阴性结果的患者 (卡方检验，p <0.01，RR 5.1)。总体而言，敏感性、特异性、阳性和阴性预测值分别为56% 、87% 、45% 和91%。在早产患者中，这些值分别为75%，87%，60% 和93%。在接下来的两周内，没有阴性结果的患者早产。结论对早产患者进行胎儿纤连蛋白试验对预测早产有一定的帮助。不建议对风险增加的患者 (无症状患者) 进行常规测试，因为缺乏有效性。

BACKGROUND & AIMS: :The physiological responses of potato (Solanum tuberosum L. cv. Folva) to partial root-zone drying (PRD) were investigated in potted plants in a greenhouse (GH) and in plants grown in the field under an automatic rain-out-shelter. In the GH, irrigation was applied daily to the whole root system (FI), or to one-half of the root system while the other half was dried, for 9 d. In the field, the plants were drip irrigated either to the whole root system near field capacity (FI) or using 70% water of FI to one side of the roots, and shifted to the other side every 5-10 d (PRD). PRD plants had a similar midday leaf water potential to that of FI, whereas in the GH their root water potential (Psi(r)) was significantly lowered after 5 d. Stomatal conductance (g(s)) was more sensitive to PRD than photosynthesis (A) particularly in the field, leading to greater intrinsic water use efficiency (WUE) (i.e. A/g(s)) in PRD than in FI plants on several days. In PRD, the xylem sap abscisic acid concentration ([ABA](xylem)) increased exponentially with decreasing Psi(r); and the relative [ABA](xylem) (PRD/FI) increased exponentially as the fraction of transpirable soil water (FTSW) in the drying side decreased. In the field, the leaf area index was slightly less in PRD than in FI treatment, while tuber biomass was similar for the two treatments. Compared with FI, PRD treatment saved 30% water and increased crop water use efficiency (WUE) by 59%. Restrictions on leaf area expansion and g(s) by PRD-induced ABA signals might have contributed to reduced water use and increased WUE.

背景与目标： : 研究了马铃薯 (Solanum tuberosum L. cv. Folva) 对部分根区干燥 (PRD) 的生理响应在温室 (GH) 的盆栽植物和在自动雨淋下在田间种植的植物中进行遮蔽。在GH中，每天对整个根系 (FI) 或根系的一半进行灌溉，而另一半干燥，持续9天。在田间，将植物滴灌到整个根系近场容量 (FI) 或使用70% 的FI水到根的一侧，并每5-10 d (PRD) 转移到另一侧。PRD植物的正午叶水势与FI相似，而在GH中，其根水势 (Psi(r)) 在5 d后显着降低。气孔导度 (g(s)) 对PRD比对光合作用更敏感 (a)，尤其是在田间，导致PRD的固有用水效率 (WUE) (即A/g(s)) 比FI工厂在几天内更高。在PRD中，木质部汁液脱落酸浓度 ([ABA](xylem)) 随Psi(r) 的降低呈指数增长; 随着干燥侧可蒸腾土壤水 (FTSW) 的比例降低，相对 [ABA](木质部) (PRD/FI) 呈指数增长。在田间，PRD的叶面积指数略低于FI处理，而两种处理的块茎生物量相似。59% 年，与FI相比，PRD处理可节省30% 水分，提高作物水分利用效率 (WUE)。PRD诱导的ABA信号对叶面积扩张和g(s) 的限制可能有助于减少用水量和增加WUE。

BACKGROUND & AIMS: :With recent advances in technology, fetal sacrococcygeal teratoma is being diagnosed increasingly during the early prenatal period by ultrasound examination. In addition, early detection of tumor related complications such as polyhydramnios, congestive heart failure, hydrops, hemorrhage, urinary tract or bowel obstruction can be followed closely in utero. Active prenatal management can improve fetal perinatal outcome by allowing planned delivery for neonatal surgery [Chisholm, C.A. et al.: Am J Perinatol 1999;16:47-50] or in some cases, fetal intervention. Additionally, families can be counseled appropriately regarding the range of outcomes. We report a case of fetal sacrococcygeal teratoma Type I diagnosed at 20 weeks with a prominent vessel supplying the tumor mass. At 23 weeks, there was a sudden appearance of an additional lobular mass, consistent with intrauterine spontaneous ruptured of a sacrococcygeal teratoma mass.

背景与目标： : 随着技术的最新发展，在产前早期，通过超声检查越来越多地诊断出胎儿sa尾畸胎瘤。此外，早期发现与肿瘤相关的并发症，如羊水过多，充血性心力衰竭，积水，出血，尿路或肠梗阻，可在子宫内密切随访。积极的产前管理可以通过允许新生儿手术的计划分娩来改善胎儿围产期结局 [Chisholm，c.a等人: Am J Perinatol 1999;16:47-50] 或在某些情况下，进行胎儿干预。此外，可以就结局的范围向家庭提供适当的咨询。我们报告了一例在20周时诊断为I型胎儿sa尾畸胎瘤的病例，其中有突出的血管供应肿瘤。在第23周时，突然出现了额外的小叶肿块，与子宫内自发性sa尾畸胎瘤破裂一致。

BACKGROUND & AIMS: In this study, we determined the outcome in cases of isolated nuchal lucency seen sonographically in the first trimester in fetuses without karyotypic abnormalities. We reviewed all cases of isolated localized fetal nuchal lucency (3 mm or greater) in 9 to 14 week fetuses over a 4 year period. Fetuses with additional sonographic abnormalities were excluded. The width of the nuchal lucency at initial sonogram as well as findings on subsequent scans were tabulated. Karyotypic, pathologic, and clinical follow-up data were obtained. Of 44 fetuses with an isolated, localized first trimester nuchal lucency, one was lost to follow-up and two were excluded owing to pregnancy termination without karyotype or pathologic analysis, thus resulting in 41 fetuses in our study group. Five fetuses (12%) had abnormal karyotypes. Twenty-seven of the remaining 36 fetuses had normal karyotypes, eight others showed no evidence of aneuploidy at birth, and one patient underwent spontaneous abortion prior to a karyotypic analysis. Among the 36 fetuses without evidence of aneuploidy, six had a poor outcometwo were spontaneous abortions, one was a therapeutic abortion of a fetus with hydrops and a pericardial effusion seen on fetopsy; one fetus died at birth of pulmonary hypoplasia associated with autosomal recessive polycystic kidney disease, and one fetus each had Noonan syndrome, and Joubert syndrome. In addition, three patients delivered their infants prematurely. Overall, 32 of 41 fetuses survived, and two (6%) were abnormal. Excluding premature infants, 27 were normally grown, term survivors. We conclude that other than having an increased risk for aneuploidy, fetuses with isolated nuchal lucency are also at risk for spontaneous miscarriage, premature delivery, and congenital anomalies unassociated with an abnormal karyotype.

背景与目标： 在这项研究中，我们确定了在没有核型异常的胎儿中，在早期妊娠的超声检查中发现的孤立的nuchal lucency病例的结果。我们回顾了在4年内9至14周胎儿中所有孤立的局部胎儿脐部透明度 (3毫米或更高) 的病例。排除了其他超声检查异常的胎儿。将初始超声检查时的nuchal透明宽度以及随后的扫描结果制成表格。获得了核型，病理和临床随访数据。在44个胎儿中，有孤立的，局部的早期妊娠的胎儿，其中1个失去了随访，2个由于没有核型或病理分析而终止妊娠而被排除在外，因此我们的研究组中有41个胎儿。五个胎儿 (12%) 的核型异常。其余36例胎儿中有27例具有正常的核型，其他8例在出生时没有显示出非整倍性的证据，一名患者在进行核型分析之前进行了自然流产。在没有非整倍性证据的36例胎儿中，有6例结果不佳，其中2例是自然流产，1例是胎儿水肿和心包积液的治疗性流产。一名胎儿死于与常染色体隐性遗传性多囊肾相关的肺发育不全，每名胎儿患有Noonan综合征，和朱伯特综合症。此外，三名患者早产。总体而言，41例胎儿中有32例存活，其中2例 (6% 例) 异常。除早产儿外，27例正常生长，足月幸存者。我们得出的结论是，除了增加非整倍性的风险外，具有孤立的nuchal透明的胎儿也有自发性流产，早产和与核型异常无关的先天性异常的风险。

BACKGROUND & AIMS: Evidence of a significant metabolic acidosis, an umbilical artery base deficit > 12 mmol/L, confirms that an asphyxial exposure has occurred. This is observed at delivery in approximately 2% of all pregnancies. Classification of the severity of the asphyxial exposure is difficult because the duration and nature of the exposure and the characteristics of the fetal cardiovascular response to the asphyxia in the affected fetus is usually not known. A classification is proposed in which the exposure to asphyxia is confirmed by a blood gas and acid-base assessment with evidence of a significant metabolic acidosis and the severity is defined by newborn encephalopathy and other organ system complications. Outstanding issues that may enhance this classification are identified.

背景与目标： 有明显代谢性酸中毒的证据，脐动脉基础缺陷> 12 mmol/L，证实发生了窒息暴露。在大约2% 的所有妊娠中，在分娩时观察到这一点。很难对窒息暴露的严重程度进行分类，因为通常不知道暴露的持续时间和性质以及受影响胎儿对窒息的胎儿心血管反应的特征。提出了一种分类，其中通过血气和酸碱评估确认了窒息的暴露，并有明显代谢性酸中毒的证据，并且严重程度由新生儿脑病和其他器官系统并发症定义。确定了可能会增强此分类的未决问题。

BACKGROUND & AIMS: OBJECTIVES:Monochorionic (MC) twins are at increased risk of early fetal loss secondary to vascular complications such as twin-twin transfusion syndrome (TTTS). This study compared the early perinatal loss rates between MC and dichorionic (DC) twins in an era of invasive treatment for TTTS. METHODS:This was a retrospective study of all twin pregnancies of known chorionicity from a large regional cohort of nine hospitals over a 10-year period. Ultrasound data were matched to hospital delivery records and to a mandatory national register of pregnancy losses. Prospective risk of pregnancy loss from 14 to 24 weeks' gestation was calculated and the survival trend of MC and DC twins was analyzed using Kaplan-Meier survival analysis. RESULTS:The analysis included 3117 twin pregnancies (605 MC and 2512 DC). The total risk of early pregnancy loss (miscarriage and neonatal death) before 24 weeks was significantly higher in MC twins (60.3 per 1000 fetuses) than in DC twins (6.6 per 1000 fetuses), with a relative risk of 9.18 (95% CI, 6.0-13.9). Survival analysis showed a significant difference in overall and early mortality between MC and DC twins (log-rank test, P < 0.0001), while no difference was noted after 24 weeks' gestation (log-rank test, P = 0.08). CONCLUSIONS:Early pregnancy loss is significantly more common in MC than in DC twins, but no difference in the prospective risk of mortality between MC and DC twins is evident after 24 weeks' gestation. The observed early mortality rate has almost halved in comparison with previous studies in the published literature. Early detection and prompt treatment of complications in MC twins are likely to have contributed to this improvement in outcome.

背景与目标：

BACKGROUND & AIMS: :Fetal growth, birth weight specific mortality rates and effect of sick leave or hospitalization on the fetal growth were investigated in a material of 476 twin pregnancies managed at University Central Hospital of Turku in years 1970-81. Birth weights of twin babies at any gestational age were slightly but not significantly higher than in earlier materials. When compared to growth curve of singleton fetuses, the growth rate of both twins is equal to singletons up to 30th week of pregnancy, being thereafter slower than in singleton pregnancies. Although duration of sick leave and hospitalization increased considerably during the study period, no change in the duration of pregnancy nor in the weight of twin babies occurred. Instead perinatal mortality decreased from 101/per thousand to 36.2/per thousand. Birth weight specific mortality rates did not differ from those in singleton fetuses.

背景与目标： : 在图尔库大学中央医院1970-81年管理的476例双胎妊娠材料中，研究了胎儿生长，出生体重特定死亡率以及病假或住院对胎儿生长的影响。在任何胎龄的双胞胎婴儿的出生体重均略高于但不显着高于早期材料。与单胎胎儿的生长曲线相比，两个双胞胎的生长速度等于怀孕第30周的单胎，此后比单胎妊娠慢。尽管在研究期间病假和住院时间大大增加，但怀孕时间和双胞胎婴儿的体重没有变化。相反，围产期死亡率从101/每千下降到36.2/每千。出生体重特定死亡率与单胎胎儿没有差异。

BACKGROUND & AIMS: OBJECTIVE:Acute stress reactions (ASR) and postpartum depressive symptoms (PDS) are frequent after childbirth. The present study addresses the change and overlap of ASR and PDS from the 1- to 3-week postpartum and examines the interplay of caregiver support and subjective birth experience with regard to the development of ASR/PDS within a longitudinal path model. METHOD:A total of 219 mothers completed questionnaires about caregiver support and subjective birth experience (Salmon's Item List) at 48-6-h postpartum. ASR and PDS were measured for 1- and 3-week postpartum. The Impact of Event Scale (IES) was used to assess ASR, and the Edinburgh Postnatal Depression Scale (EPDS) was used to assess PDS. RESULTS:ASR was frequent 1-week postpartum (44.7%) and declined till week 3 (24.8%, p <.001), while the prevalence of PDS was continuous (14.2% week 1; 12.6% week 3; p = .380). Favorable reports of caregiver support were related to better subjective childbirth experience, which was related to lower ASR and PDS (controlled for age, mode of delivery, parity, EDA and duration of childbirth). CONCLUSION:High quality of intrapartum care and positive birth experiences facilitate psychological adjustment in the first 3-week postpartum.

背景与目标：