First trimester screening for preeclampsia

Can SIRI or other inflammatory indices predict HELLP syndrome in the first trimester?

OBJECTIVE

To investigate the use of systemic immune-response index (SIRI) and other inflammatory indices for the prediction of HELLP syndrome STUDY DESIGN: The presented retrospective case-control study was conducted with twenty-eight pregnant women diagnosed with HELLP syndrome and 100 low-risk pregnant women. The possible predictive indices for HELLP syndrome were determined as NLR (neutrophil/lymphocyte), MLR (monocyte/lymphocyte), HbLR (hemoglobin/lymphocyte), SII (neutrophil×platelet/lymphocyte), and SIRI (neutrophil×monocyte/lymphocyte). The indices were evaluated in the first trimester and at the admission time for delivery for all participants. The statistical analyses were carried out using SPSS 23. Descriptive statistics were presented as the mean and standard deviation (SD), as they conform to a normal distribution. To compare the parameters between the groups, the Student-t test was used. Categorical variables were presented as numbers and percentages. The chi-square test was used to compare categorical variables between groups. The paired sample t-test was used to compare correlated samples. Statistical significance was defined as a two-tailed P value of 0.05.

RESULTS

In the first trimester; WBC, neutrophil, and monocyte counts were statistically higher in the HELLP syndrome group. However, no significant difference was observed between the groups for the concerned indices. The hemoglobin, WBC, neutrophil, monocyte counts, NLR, SIRI and MLR were significantly higher in the HELLP group at the delivery time. Platelet count was decreased and ALT/AST counts and adverse outcomes were found to be significantly higher at delivery time admission in the HELLP syndrome group.

CONCLUSION

To the best of our knowledge, this was the first study investigating SIRI with the other indices for the prediction of HELLP syndrome in accordance with its inflammatory etiology. The underlying inflammatory process was observed at the delivery time. However, none of the investigated indices was found effective in the first trimester in the prediction. Simple and non-invasive prediction indices might be valuable tools for the prediction and management of HELLP syndrome. Further and larger studies are needed for this purpose.

First-trimester screening for fetal growth restriction using Doppler color flow analysis of the uterine artery and serum PAPP-A levels in unselected pregnancies

Purpose: To explore an early diagnostic model for fetal growth restriction (FGR) at 11-13 (+6 days) gestational weeks using Doppler analysis of the uterine artery and measurements of pregnancy-associated plasma protein-A (PAPP-A).Methods: This was a prospective study which included 1796 singleton pregnant women, who received routine pregnancy examination at 11-13 (+6 days) gestational weeks in Shanghai Changning Maternity and Infant Health Hospital between 1 June 2017 and 31 July 2018. Uterine artery pulsatility index (PI), uterine resistance index (RI), and notching were recorded using the Doppler ultrasound detector (Voluson E8; GE Healthcare, Kretztechnik, Zipf, Austria). Maternal serum PAPP-A was assayed using time-resolved fluorescence immunoassay (Perkin-Elmer Life Sciences, Waltham, MA, USA) and analyzed using Fetal Medicine Foundation software. Maternal and neonatal outcomes were followed.Results: Out of 1796 pregnant women aged 18-42 years, 76 (4.2%) mothers had FGR fetus. In the FGR fetuses, the mean uterine artery PI and RI were higher, the PAPP-A levels were 0.42-fold lower (all p values < .05), and notching was 40% higher (p < .0001) than in non-FGR fetuses. The sensitivity and specificity of early diagnosis of FGR and the area under the curve for the combination of uterine artery PI and PAPP-A were 0.788 (95% CI: 0.735, 0.842), 0.816, and 0.758, respectively. A combination of PAPP-A and Doppler analysis of uterine artery was better than individual measurements for predicting FGR (all p values < .05), and the specificity was significantly improved after including serum PAPP-A.Conclusion: The combination of uterine artery PI and PAPP-A measured at 11-13 (+6 days) gestational weeks provides a sensitive and specific predictor for early diagnosis of FGR.

Placental protein-13 (PP13) in combination with PAPP-A and free leptin index (fLI) in first trimester maternal serum screening for severe and early preeclampsia

Background:

Placental protein-13 (PP13) is involved in placental invasion and has been suggested as a maternal serum marker of preeclampsia (PE) development. However, the discriminatory ability of PP13 in first trimester has not been completely clarified.

Methods:

PP13 was measured in first trimester (week 10+3–13+6) maternal serum from 120 PE pregnancies and 267 control pregnancies and was correlated with clinical parameters. The population screening performance of PP13 in combination with the PE markers pregnancy associated plasma protein A (PAPPA) and free leptin index (fLI) was assessed by Monte Carlo simulation.

Results:

In severe PE (including HELLP) cases (n=26) the median PP13 concentration was 35.8 pg/mL (range: 17.8–85.5 pg/mL) and in PE pregnancies (n=10) with birth prior to week 34, the median PP13 concentration was 30.6 pg/mL (13.1–50.1 pg/mL), compared to controls with a median of 54.8 pg/mL (range: 15.4–142.6 pg/mL) (p<0.04). The population screening detection rate (DR) for a false-positive rate of 10% for severe PE and HELLP was 26% for PP13, 28% for PP13+PAPP-A, 33% for PP13+fLI, and 40% for PP13+PAPP-A+fLI.

Conclusions:

PP13 is a marker of severe PE and HELLP syndrome. The screening performance of PP13 can be markedly improved by combining it with fLI and PAPP-A.

Uterine artery pulsatility index in hypertensive pregnancies: When does the index normalize in the puerperium?

Objective

To investigate whether the uterine artery pulsatility index (UtA PI) of hypertensive pregnancies is higher than that of normal pregnancies in the puerperium, as well as in the antepartum period.

Methods

The UtA PI was measured in hypertensive (group 1) and normal pregnancies (group 2) during antepartum, immediate postpartum or late postpartum periods. Using the transvaginal approach, the bilateral uterine artery indices were measured.

Results

One hundred twenty-two women were enrolled: group 1, hypertensive disease in pregnancy (11 cases in antepartum, 13 cases in immediate postpartum and 10 cases in late postpartum period); group 2, normal pregnancies (32 cases in antepartum, 29 cases in immediate postpartum and 27 cases in late postpartum). In antepartum and immediate postpartum periods, the mean UtA PI and the proportion of cases with an early diastolic notch were higher in group 1 than in group 2 (antepartum mean UtA PI, 1.14 in group 1 vs. 0.68 in group 2, P<0.001; early diastolic notch, 46% vs. 9%, P<0.05; immediate postpartum mean UtA PI, 1.30 vs. 1.08, P<0.05; early diastolic notch, 85% vs. 48%, P<0.05). In late postpartum period, the mean value of UtA PI of group 1 was still higher than that of group 2, although the proportion of cases with an early diastolic notch was not different (mean UtA PI, 1.43 vs. 1.20, P<0.05; early diastolic notch, 60% vs. 52%, P=0.73).

Conclusion

The UtA PI in hypertensive pregnancies was still higher than normal pregnancies in puerperal periods, suggesting that more than several weeks are required to resolve increased uterine artery vascular impedance.

Does Endometriosis Affect PAPP-A Concentration in First Trimester Fetal Screening Test?

Objective

Pregnancy-associated plasma protein A (PAPP-A) is a macromolecular glycoprotein. The peritoneal fluid of women affected by endometriosis shows a significant increase of PAPP-A levels. Given the important role of PAPP-A in first trimester screening test, we wondered if its presence in the peritoneal fluid of women with endometriosis could affect biochemical parameters of the test performed during pregnancy.

Methods

A prospective study enrolled 78 women with singleton pregnancy who performed combined test between 11 + 0 and 13 + 6 weeks of gestation: 25 women with previous histological diagnosis of endometriosis and 53 women without. All patients were sampled to determine PAPP-A concentrations. Serum levels of PAPP-A were expressed in UI/L and in MoM (multiples of median). The two groups – endometriosis women and non-endometriosis women – were compared in order to find a possible different concentration of serum PAPP-A.

Results

We found an increased concentration of both PAPP-A UI/L and PAPP-A MoM in deep endometriosis patients versus ovarian endometriosis with significant difference in PAPP-A MoM (p = 0.018). We also found a significant association between the stage of the disease and PAPP-A UI/L and MoM levels (PAPP-A UI/L p = 0.05, PAPP-A MoM p = 0.01).

Conclusions

Women with deep endometriosis show increased serum PAPP-A concentrations compared to women with ovarian endometriosis. Likewise, women with moderate or severe stage of the disease show increased serum PAPP-A concentrations compared to women with minimum or mild disease. This increase could affect first trimester aneuploidy screening test and endometriosis could represent a confounding factor in the calculation of aneuploidy risk.

Preeclampsia: Updates in Pathogenesis, Definitions, and Guidelines

Preeclampsia is becoming an increasingly common diagnosis in the developed world and remains a high cause of maternal and fetal morbidity and mortality in the developing world. Delay in childbearing in the developed world feeds into the risk factors associated with preeclampsia, which include older maternal age, obesity, and/or vascular diseases. Inadequate prenatal care partially explains the persistent high prevalence in the developing world. In this review, we begin by presenting the most recent concepts in the pathogenesis of preeclampsia. Upstream triggers of the well described angiogenic pathways, such as the heme oxygenase and hydrogen sulfide pathways, as well as the roles of autoantibodies, misfolded proteins, nitric oxide, and oxidative stress will be described. We also detail updated definitions, classification schema, and treatment targets of hypertensive disorders of pregnancy put forth by obstetric and hypertensive societies throughout the world. The shift has been made to view preeclampsia as a systemic disease with widespread endothelial damage and the potential to affect future cardiovascular diseases rather than a self-limited occurrence. At the very least, we now know that preeclampsia does not end with delivery of the placenta. We conclude by summarizing the latest strategies for prevention and treatment of preeclampsia. A better understanding of this entity will help in the care of at-risk women before delivery and for decades after.

First trimester placental retinol-binding protein 4 (RBP4) and pregnancy-associated placental protein A (PAPP-A) in the prediction of early-onset severe pre-eclampsia

OBJECTIVE

In a retrospective case-control study, we examined the levels of placental retinol-binding protein 4 (RBP4) and pregnancy-associated placental protein A (PAPP-A) in first-trimester maternal serum samples as well as maternal characteristics to predict early-onset and severe pre-eclampsia.

METHODS

In this retrospective case-control study, we identified females who delivered a singleton pregnancy on or after 24 weeks' gestation from 2003 to 2010 at Oulu University Hospital and had a retrospective first trimester trisomy screening, including serum PAPP-A measurement. Within this cohort, we identified 65 females who experienced early onset pre-eclampsia (EO-PE) and 742 controls who had uncomplicated deliveries. Retrospectively, we thawed all previously collected serum samples to measure placental retinol binding protein 4 (RBP4). PAPP-A and RBP4 were measured using automatic immunoassay systems and converted to multiples of the median (MoMs). Logistic regression analysis was performed to determine whether these biomarkers separately and in combination with maternal characteristics (maternal age, weight and smoking status) can be used to predict the development of early onset pre-eclampsia.

RESULTS

The expected log(10) PAPP-A concentration and the expected log(10) RBP4 concentration in the control group were both affected by maternal weight and smoking status. The expected log(10) PAPP-A concentration was also affected by gestational age (GA). RBP4 levels in first-trimester serum were significantly higher in females who subsequently developed EO-PE outcome compared to those with normal pregnancy outcome (1.14 vs. 1.01 MoMs, p<0.0001). Maternal serum PAPP-A levels from the same pregnancy period were significantly lower in the EO-PE group compared to controls (0.80 vs. 1.05 MoMs, p=0.005). The risk model including maternal characteristics with PAPP-A log(10) MoM and RBP4 log(10) MoM had the best EO-PE prediction ability. It detected 34% (23%-46%) of females with subsequent EO-PE with a 10% false positive rate.

CONCLUSION

This study showed that first-trimester maternal serum RBP4 was significantly increased and that PAPP-A decreased in pregnancies that ended in EO-PE compared to normal pregnancies. Thus, these markers may be useful members in a panel of markers for the early detection of early-onset and severe pre-eclampsia.

Fetal hemoglobin in preeclampsia: a new causative factor, a tool for prediction/diagnosis and a potential target for therapy

PURPOSE OF REVIEW

Preeclampsia, one of the leading causes of pregnancy complications, affects 3-7% of pregnant women. This review summarizes the present knowledge of a new potential cause of the disease and suggests a method for its prediction/diagnosis and a possible treatment, both based on the recent findings on the involvement of fetal hemoglobin (HbF) and the heme and radical scavenging protein A1M (alpha-1-microglobulin).

RECENT FINDINGS

Gene and protein profiling studies have independently shown that increased amount of free HbF is accumulated in the preeclampsia placenta. As a result of a predominantly oxidative damage to the blood-placenta barrier, HbF leaks over to the maternal blood circulation. Elevated levels can be measured already in the first trimester, and later in pregnancy, the levels correlate with the blood pressure in women with preeclampsia. Ex-vivo data show that the human protein A1M, an endogeneous antioxidation protection protein, can prevent Hb-induced damage to the placenta, restore the blood-placental barrier and prevent maternal tissue damage.

SUMMARY

Free HbF may provide both a predictive and a diagnostic clinical biomarker from the first trimester. A1M has the potential as a future pharmacological treatment for preeclampsia.

Three-dimensional sonographic assessment of placental volume and vascularization in pregnancies complicated by hypertensive disorders

OBJECTIVES

The purpose of this study was to evaluate the association between placental volumes, placental vascularity, and hypertensive disorders in pregnancy.

METHODS

A prospective case-control study was conducted between April 2011 and July 2012. Placental volumes and vascularity were evaluated by 3-dimensional sonographic, 3-dimensional power Doppler histographic, and 2-dimensional color Doppler studies. Pregnant women were classified as normotensive or hypertensive and stratified by the nature of their hypertensive disorders. The following variables were evaluated: observed-to-expected placental volume ratio, placental volume-to-estimated fetal weight ratio, placental vascular indices, and pulsatility indices of the right and left uterine and umbilical arteries.

RESULTS

Sixty-six healthy pregnant women and 62 pregnant women with hypertensive disorders were evaluated (matched by maternal age, gestational age at sonography, and parity). Placental volumes were not reduced in pregnancy in women with hypertensive disorders (P > .05). Conversely, reduced placental vascularization indices (vascularization index and vascularization-flow index) were observed in pregnancies complicated by hypertensive disorders (P < .01; P < .01), especially in patients with superimposed preeclampsia (P = .04; P = .02). A weak correlation was observed between placental volumes, placental vascular indices, and Doppler studies of the uterine and umbilical arteries.

CONCLUSIONS

Pregnancies complicated by hypertensive disorders are associated with reduced placental vascularity but not with reduced placental volumes. These findings are independent of changes in uterine artery Doppler studies. Future studies of the prediction of preeclampsia may focus on placental vascularity in combination with results of Doppler studies of the uterine arteries.

Azurocidin levels in maternal serum in the first trimester can predict preterm prelabor rupture of membranes

OBJECTIVE

To determine the possible association between azurocidin in maternal serum in the first trimester of pregnancy and subsequent spontaneous preterm labor, preterm prelabor rupture of membranes, and iatrogenic preterm delivery.

METHODS

Women who underwent first trimester screening for chromosomal abnormalities between January and November 2011 were included in the study, and a sample of maternal serum was obtained. In total, 1905 women were followed-up through the local record system, and 13 women with spontaneous preterm labor, 17 women with preterm prelabor rupture of membranes (PPROM), and 16 women with iatrogenic preterm delivery were identified. Twenty-two women with uncomplicated pregnancies who delivered at term were selected as controls. Maternal serum azurocidin levels in women were determined using ELISA.

RESULT

Women with PPROM had lower azurocidin levels (median 0.91 ng/mL, range 0.2-2.07) than women who delivered at term (median 1.63 ng/mL, range 0.4-10.98; p = 0.02). No differences in azurocidin levels between women with labor at term and those with either spontaneous preterm labor (median 1.46 ng/mL, range 0.19-2.59; p = 0.42) or iatrogenic preterm delivery (median 1.60 ng/mL, range 0.66-7.96; p = 0.27) were found.

CONCLUSIONS

Low levels of azurocidin in maternal serum in the first trimester were associated with subsequent PPROM.

[Hypertension in pregnancy: the current state of the art]

Hypertension complicates 6-8% of pregnancies and includes the following four conditions: hypertension preceding pregnancy or documented before the 20th week of gestation; pre-eclampsia (PE)/eclampsia; chronic hypertension with superimposed pre-eclampsia; and gestational hypertension. The latter is defined as a significant rise in blood pressure after the 20th week of pregnancy in previously normotensive women, to over 140/90 mmHg. When blood pressure remains above 160/110 mmHg, it is considered severe. PE is defined as the presence of proteinuria (> or = 300 mg/24 h) in pregnant women with hypertension. The hypertensive syndromes of pregnancy are among the leading causes of maternal and fetal morbidity and mortality and anti-hypertensive treatment is part of the therapeutic arsenal used to prevent serious complications. Although the role of utero-placental insufficiency due to deficient migration of trophoblasts to the spiral arteries is universally accepted, the pathophysiology of PE remains largely unknown and is the subject of debate. No effective ways of predicting or preventing PE have been found, which highlights the need for further research in this field. This review aims primarily to evaluate recent advances in our understanding of the pathophysiology of gestational hypertension and especially PE, and new ways of predicting PE. Additionally, we present a brief review on the diagnosis, prevention and treatment of PE.

Placental lesions associated with maternal underperfusion are more frequent in early-onset than in late-onset preeclampsia

OBJECTIVE

Preeclampsia (PE) has been classified into early- and late-onset disease. These two phenotypic variants of PE have been proposed to have a different pathophysiology. However, the gestational age cut-off to define "early" vs. "late" PE has varied among studies. The objective of this investigation was to determine the prevalence of lesions consistent with maternal underperfusion of the placenta in patients with PE as a function of gestational age.

STUDY DESIGN

A nested case-control study of 8307 singleton pregnant women who deliver after 20 weeks of gestation was constructed based on a cohort. Cases were defined as those with PE (n=910); controls were pregnant women who did not have a hypertensive disorder in pregnancy (n=7397). The frequency of maternal underperfusion of the placenta (according to the criteria of the Society for Pediatric Pathology) was compared between the two groups. Logistic regression was used for analysis. Estimated relative risks (RRs) were calculated from odds ratios.

RESULTS

1) The prevalence of lesions consistent with maternal underperfusion was higher in patients with PE than in the control group [43.3% vs. 15.9%, unadjusted odds ratio 4.0 (95% CI 3.5-4.7); P<0.001]; 2) the estimated RR of maternal underperfusion lesions in PE was higher than in the control group [RR=2.8 (95% CI 2.5-3.0)]; 3) the lower the gestational age at delivery, the higher the RR for these lesions; 4) early-onset PE, regardless of the gestational age used to define it (<32, 33, 34, 35 or 37 weeks) had a significantly higher frequency of placental lesions consistent with maternal underperfusion than late-onset PE (P<0.001 for all).

CONCLUSIONS

1) The earlier the gestational age of preeclampsia at delivery, the higher the frequency of placental lesions consistent with maternal underperfusion; 2) our data suggest that demonstrable placental involvement as determined by pathologic examination differs in early- and late-onset preeclampsia; and 3) this phenomenon appears to be a continuum, and we could not identify a clear and unambiguous gestational age at which lesions consistent with underperfusion would not be present.

Fetal hemoglobin and α1-microglobulin as first- and early second-trimester predictive biomarkers for preeclampsia

OBJECTIVE

The aim of this study was to evaluate fetal hemoglobin (HbF) and α(1)-microglobulin (A1M) in maternal serum as first-trimester biomarkers for preeclampsia (PE).

STUDY DESIGN

The design was a case-control study. We included 96 patients in the first trimester of pregnancy (60 with PE and 36 controls). Venous serum samples were analyzed for HbF and total hemoglobin (Hb) by enzyme-linked immunosorbent assay and for A1M by radioimmunoassay. Sensitivity and specificity was calculated by logistic regression and receiver operating characteristic curve analysis.

RESULTS

The HbF/Hb ratio and A1M concentration were significantly elevated in serum from women with subsequent development of PE (P < .0001). The optimal sensitivity and specificity was obtained using the biomarkers in combination; 69% sensitivity for a 5% screen positive rate and 90% sensitivity for a 23% screen positive rate.

CONCLUSION

The study suggests that HbF/Hb ratio in combination with A1M is predictive biomarkers for PE.

Public health perspectives of preeclampsia in developing countries: implication for health system strengthening

OBJECTIVES

Review of public health perspectives of preeclampsia in developing countries and implications for health system strengthening.

METHODS

Literature from Pubmed (MEDLINE), AJOL, Google Scholar, and Cochrane database were reviewed.

RESULTS

The prevalence of preeclampsia in developing countries ranges from 1.8% to 16.7%. Many challenges exist in the prediction, prevention, and management of preeclampsia. Promising prophylactic measures like low-dose aspirin and calcium supplementation need further evidence before recommendation for use in developing countries. Treatment remains prenatal care, timely diagnosis, proper management, and timely delivery. Prevailing household, community, and health system factors limiting effective control of preeclampsia in these countries were identified, and strategies to strengthen health systems were highlighted.

CONCLUSION

Overcoming the prevailing challenges in the control of preeclampsia in developing countries hinges on the ability of health care systems to identify and manage women at high risk.

Colour Doppler ultrasound of spiral artery blood flow in the prediction of pre-eclampsia and intrauterine growth restriction

Pre-eclampsia and intrauterine growth restriction are responsible for significant maternal and fetal morbidity and mortality worldwide. Identifying pregnancies at highest risk for their development would allow increased surveillance in individual pregnancies and also allow therapeutic trials to decrease their incidences in the future. To date, multiple attempts to develop a screening test for these disorders have met with limited success. Proposed screening methods have included maternal serum biochemical parameters as well as ultrasonographic markers. Uterine artery Doppler, direct evaluation of the spiral arteries using colour and spectral Doppler, three-dimensional placental volume analysis and, most recently, three-dimensional power Doppler angiography have all been suggested. Although an adequate screening method remains elusive, advances in ultrasound technology have improved our ability to observe the pathophysiologic changes that occur with these conditions early in pregnancy, bringing us closer to a reproducible screening model.

Application of a first-trimester prediction model for pre-eclampsia based on uterine arteries and maternal history in high-risk pregnancies

OBJECTIVE

To assess the value of a prediction model for pre-eclampsia (PE) in the first trimester (Ultrasound Obstet Gynecol 2007;30:742-794) for the prediction of late (>34 weeks) and early (< or =34 weeks) PE in a high-risk population.

METHODS

Longitudinal study performed in 152 high-risk pregnancies with at least one high-risk condition: previous PE, hypertension, pregestational diabetes, renal disease, obesity, hyperlipidemia, autoimmune disorders, thrombophilia or recurrent pregnancy loss. Mean uterine artery pulsatility index at 11 to 13 + 6 weeks and a series of maternal variables were combined in order to obtain the estimated 'a posteriori risk for PE' in each woman. This risk for unaffected women was compared with that for patients who subsequently developed late and early PE. The performance of such approach was described by receiver-operating characteristic curves.

RESULTS

Late PE developed in 13 (8.6%) pregnancies and early PE in seven (4.6%). The median 'a posteriori risk for PE' in the unaffected, late PE, and early PE groups was 0.62%, 1.22%, and 2.49% (P < 0.01), respectively. For a false-positive rate of 10%, the detection rates of late and early PE were 23.1 and 42.9%, respectively.

CONCLUSIONS

This referenced model shows a modest performance when applied to high-risk women.

Relationship between prepregnancy and early pregnancy uterine blood flow and resistance index

We evaluated the relationship between prepregnancy and early pregnancy uterine blood flow (UBF) and resistance index (RI). Nineteen nulliparous participants were studied during cycle day 8 + 4, and early pregnancy (13.4 + 1.6 weeks). Color Doppler ultrasound of both uterine arteries and maternal heart was performed to calculate uterine RI, volumetric UBF, and cardiac output (CO), respectively. We observed a strong negative association of uterine RI with prepregnancy UBF (r = -.82, P < .001) that weakened, but remained significant in early pregnancy (r =-.48, P = .04). Prepregnancy uterine index (UBF/CO) was significantly associated with early pregnancy uterine index; r = .48, P = .04). There was also a trend associating prepregnancy and early pregnancy volumetric UBF (r = .44, P = .068). Prepregnancy UBF may be a determinant of early pregnancy UBF and UBF may have independent value as a predictor of adverse pregnancy outcome.

Ultrasound of the placenta: a systematic approach. Part II: functional assessment (Doppler)

Doppler velocimetry is the ideal clinical tool to assess placental performance in high-risk pregnancies. It also has value in predicting later complications and outcome in pregnancies which appear uncomplicated. All three circulations (fetal, placental and maternal) may be interrogated by Doppler technology. In the following review, we present basic physics aspects of Doppler and discuss mainly Doppler investigation of the fetal-placental circulation (umbilical artery, intraplacental circulation) as well as the uterine arteries. The assessment of umbilical blood flow provides information on blood perfusion of the fetal-placental unit. The diastolic blood flow velocity component in umbilical artery increases with advancing gestation. In pregnancies complicated by placental dysfunction, there may be a reduction in the number of functional villi and/or small blood vessels with, as a result, increased impedance, reflected, mainly, by a decrease in end-diastolic velocity. When the resistance increases even more, there is no diastolic forward velocity (absent end-diastolic velocity). Further increase in the resistance causes reversed end-diastolic velocity, which is considered a late step in the cascade of events leading to intrauterine fetal demise. Doppler assessment of the umbilical arteries was found to improve outcome of high-risk pregnancies, and reduce hospital admissions. On the contrary, routine Doppler ultrasound in low risk or unselected populations does not seem to confer benefit on mother or newborn. Uterine artery Doppler is a useful test in predicting pregnancies at high risk of developing complications related to uteroplacental insufficiency. It identifies women who may benefit from increased antenatal surveillance or prophylactic therapy. Three-dimensional power Doppler sonography can provide new insights into placental pathophysiology.

Uterine artery Doppler in the prediction of adverse pregnancy outcome

PURPOSE OF REVIEW

To review publications, published during the past year, that have examined uterine artery Doppler findings in women with adverse pregnancy outcome.

RECENT FINDINGS

Almost two-thirds of stillbirths that occur in the early preterm period (up to 32 weeks) can be predicted by uterine artery Doppler at 23 weeks. First trimester screening studies have shown that an abnormal result increases the risk of subsequent fetal growth restriction, and such women are at particularly high risk when indices remain abnormal in the second trimester. Studies combining uterine artery Doppler with maternal serum markers have demonstrated that measurement of first-trimester maternal serum pregnancy-associated plasma protein A and free beta human chorionic gonadotrophin improve sensitivities of second-trimester Doppler. As these are frequently measured in Down syndrome screening and they lend themselves in screening for pre-eclampsia. Women with abnormal first and second-trimester serum markers constitute a high-risk group. Maternal serum placental protein 13 remains a promising method for early screening, although a recent study suggests lower sensitivities than initially reported.

SUMMARY

Uterine artery Doppler screening identifies women at high risk for developing adverse pregnancy outcomes. Detection rates may be increased and false positive rates reduced by combination with maternal characteristics or serum markers.

Proteomic analysis of mechanisms of hypoxia-induced apoptosis in trophoblastic cells

Preeclampsia is often accompanied by hypoxia of the placenta and this condition induces apoptosis in trophoblastic cells. The aim of this study was to characterize global changes of apoptosis-related proteins induced by hypoxia in trophoblastic cells so as to clarify the mechanism of hypoxia-induced apoptosis by using the PoweBlot, an antibody-based Western array. Human choriocarcinoma cell line JAR was cultured for 24 hours under aerobic and hypoxic conditions. Hypoxia induced apoptosis accompanied by increased expression of Bcl-x, Caspase-3 and -9, Hsp70, PTEN, and Bag-1. Bad, pan-JNK/SAPK-1, Bcl-2, Bid, and Caspase-8 showed decreased expression. Hypoxia-induced apoptosis was increased with the transfection of a bag-1 antisense oligonucleotide. The bag-1 antisense oligonucleotide affected the expression of Bid, Bad, Bcl-2, JNK, and phosphorylated JNK, although expression of PTEN and Bcl-X did not change. Bag-1 may inhibit apoptosis by suppressing the expression of Bid and Bad. It may also enhance apoptosis by inhibiting the expression of Bcl-2 and by modulating phosphorylation of JNK. Both mitochondrial and stress-activated apoptosis pathways played important roles in the hypoxia induced cell death of trophoblastic cells. These findings will contribute to establish new approach to detect hypoxic stress of the placenta, which leads to preeclampsia and other hypoxia-related obstetrics complications.