Publications by authors named "Robyn A North"

Hypertensive disorders during pregnancy result in substantial maternal morbidity and are a leading cause of maternal deaths worldwide. Self-monitoring of blood pressure (BP) might improve the detection and management of hypertensive disorders of pregnancy, but few data are available, including regarding appropriate thresholds. This systematic review and individual patient data analysis aimed to assess the current evidence on differences between clinic and self-monitored BP through pregnancy.

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Introduction: Large-for-gestational-age infants are associated with increased risk of neonatal morbidity and mortality. However, most of them will not have adverse outcomes. Our aim was to identify antenatal clinical factors associated with neonatal morbidity in large-for-gestational-age infants.

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Objective: Most small for gestational age pregnancies are unrecognised before birth, resulting in substantial avoidable perinatal mortality and morbidity. Our objective was to develop multivariable prediction models for small for gestational age combining clinical risk factors and biomarkers at 15±1 weeks' with ultrasound parameters at 20±1 weeks' gestation.

Methods: Data from 5606 participants in the Screening for Pregnancy Endpoints (SCOPE) cohort study were divided into Training (n = 3735) and Validation datasets (n = 1871).

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Objective: To compare early pregnancy clinical and biomarker risk factors for later development of preeclampsia between women with obesity (body mass index, BMI ≥30 kg/m ) and those with a normal BMI (20-25 kg/m ).

Methods: In 3,940 eligible nulliparous women from the Screening for Pregnancy Endpoints (SCOPE) study, a total of 53 biomarkers of glucose and lipid metabolism, placental function, and known markers of preeclampsia were measured at 14 to 16 weeks' gestation. Logistic regression was performed to identify clinical and biomarker risk factors for preeclampsia in women with and without obesity.

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This guideline is an evidence based, practical clinical approach to the management of Hypertensive Disorders of Pregnancy. Since the previous SOMANZ guideline published in 2008, there has been significant international progress towards harmonisation of definitions in relation to both the diagnosis and management of preeclampsia and gestational hypertension. This reflects increasing knowledge of the pathophysiology of these conditions, as well as their clinical manifestations.

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Objectives: To compare the prevalence and predictors of alcohol use in multiple cohorts.

Design: Cross-cohort comparison of retrospective and prospective studies.

Setting: Population-based studies in Ireland, the UK, Australia and New Zealand.

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Study Question: Which variables at 15 and 20 weeks' gestation, particularly those amenable to modification before pregnancy, are associated with a subsequent uncomplicated pregnancy?

Summary Answer: Normalising body mass index, increasing fruit intake before pregnancy, reducing blood pressure, stopping misuse of drugs, and being in paid employment are all associated with subsequent uncomplicated pregnancy outcomes.

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More than half of all cases of preeclampsia occur in healthy first-time pregnant women. Our aim was to develop a method to predict those at risk by combining clinical factors and measurements of biomarkers in women recruited to the Screening for Pregnancy Endpoints (SCOPE) study of low-risk nulliparous women. Forty-seven biomarkers identified on the basis of (1) association with preeclampsia, (2) a biological role in placentation, or (3) a role in cellular mechanisms involved in the pathogenesis of preeclampsia were measured in plasma sampled at 14 to 16 weeks' gestation from 5623 women.

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An overrepresentation of adverse pregnancy outcomes has been observed in pregnancies associated with a male fetus. We investigated the association between fetal gender and candidate biomarkers for preeclampsia. Proteins were quantified in samples taken at 20 weeks from women recruited to the SCreening fOr Pregnancy Endpoints (SCOPE) study (preeclampsia n = 150; no preeclampsia n = 450).

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Objective: To identify factors at 15 and 20 weeks' gestation associated with a subsequent uncomplicated pregnancy.

Design: Prospective international multicentre observational cohort study.

Setting: Auckland, New Zealand and Adelaide, Australia (exploration and local replication dataset) and Manchester, Leeds, and London, United Kingdom, and Cork, Republic of Ireland (external confirmation dataset).

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Objective: To investigate the association between alcohol consumption and binge drinking before and during early pregnancy and adverse pregnancy outcomes.

Methods: We used data from 5,628 nulliparous pregnant participants recruited to the Screening for Pregnancy Endpoints (SCOPE) study, a prospective cohort study. Participants were interviewed at 15 weeks of gestation and information on alcohol intake before pregnancy and until the time of interview was obtained using a standardized questionnaire.

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Study Question: Do women with a previous miscarriage or termination of pregnancy have an increased risk of spontaneous preterm birth and is this related to previous cervical dilatation and curettage?

Summary Answer: A single previous pregnancy loss (termination or miscarriage) managed by cervical dilatation and curettage is associated with a greater risk of SpPTB.

What Is Known Already: Miscarriage affects ∼20% of pregnancies and as many as a further 20% of pregnancies undergo termination.

Study Design, Size, Duration: We utilized data from 5575 healthy nulliparous women with singleton pregnancies recruited to the Screening for Pregnancy Endpoints (SCOPE) study, a prospective cohort study performed between November 2004 and January 2011.

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Objective: Small for gestational age (SGA) infants comprise up to 50% of all stillbirths and a minority are detected before birth. We aimed to develop and validate early pregnancy predictive models for SGA infants.

Methods: 5628 participants from SCOPE, a prospective study of nulliparous pregnant women, were interviewed at 15 ± 1 weeks' gestation.

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Preeclampsia, a hypertensive pregnancy complication, is largely unpredictable in healthy nulliparous pregnant women. Accurate preeclampsia prediction in this population would transform antenatal care. To identify novel protein markers relevant to the prediction of preeclampsia, a 3-step mass spectrometric work flow was applied.

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Background: Large-for-gestational-age (LGA) or macrosomic infants are associated with adverse maternal and neonatal outcomes. It is unclear if these associations are stronger using customised birthweight centiles. We compared outcomes between term infants defined macrosomic by birthweight >4000 g (Macro(4000) ) or LGA by population centiles (LGA(pop) ) with those defined LGA by customised centiles (LGA(cust) ).

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Objectives: To identify risk factors for spontaneous preterm birth (birth <37 weeks gestation) with intact membranes (SPTB-IM) and SPTB after prelabour rupture of the membranes (SPTB-PPROM) for nulliparous pregnant women.

Design: Prospective international multicentre cohort.

Participants: 3234 healthy nulliparous women with a singleton pregnancy, follow up was complete in 3184 of participants (98.

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Objective: To describe patterns of vaginal bleeding in the first 20 weeks of pregnancy and evaluate the association between patterns of bleeding and risk of subsequent pre-eclampsia in nulliparous women.

Design: Cohort study.

Setting: Participating centres of the Screening for Pregnancy Endpoints (SCOPE) study in Auckland (New Zealand), Adelaide (Australia), Manchester and London (UK) and Cork (Ireland).

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Background: Two-dimensional polyacrylamide gel electrophoresis (2D PAGE) is commonly used to identify differentially expressed proteins under two or more experimental or observational conditions. Wu et al (2009) developed a univariate probabilistic model which was used to identify differential expression between Case and Control groups, by applying a Likelihood Ratio Test (LRT) to each protein on a 2D PAGE. In contrast to commonly used statistical approaches, this model takes into account the two possible causes of missing values in 2D PAGE: either (1) the non-expression of a protein; or (2) a level of expression that falls below the limit of detection.

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Background: Antepartum haemorrhage of unknown origin (APHUO) is associated with preterm birth and perinatal mortality.

Aim: To determine whether smoking beyond the first trimester of pregnancy was an independent risk factor for APHUO.

Methods: Rates of APHUO were compared between non-smokers and smokers, and non-smokers and ceased smokers.

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Obesity is associated with an increased level of inflammation. Interactions between inflammatory and angiogenic pathways are implicated in the major pregnancy disorders. The aim of this study was to investigate whether functional polymorphisms in angiogenesis-regulating genes (VEGFA rs699947, VEGFA rs3025039, KDR rs2071559 and ANGPT1 rs2507800) interact with the maternal BMI to modify the risk of a spontaneous preterm birth (sPTB).

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In our search for early biomarkers for the pregnancy complicationssmall for gestational age (SGA) and preeclampsia (PE) we analysed plasma from 19-21 weeks gestation in women recruited into the SCOPE study, a prospective cohort of nulliparous women, by differential in gel electrophoresis (DIGE). DIGE revealed the differential expression of clusterin levels and its isoforms in top6-depleted plasma of women who delivered an SGA infant but remained normotensive (SGA-NT; N = 8) compared to healthy women with an uncomplicated pregnancy outcome (Controls, N = 8). Immunosorbent enzyme-linked assay (ELISA) showed that compared to plasma clusterin levels from healthy controls [71.

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Pregnancies complicated by pre-eclampsia and small-for-gestational-age (SGA) infants demonstrate impaired placental vascular remodelling. Angiopoietin-1 (ANG-1) is an angiogenic growth factor which regulates vascular integrity and remodelling. The TT genotype of angiopoietin 1 (ANGPT1) rs2507800 polymorphism has been associated with increased plasma ANG-1 levels compared with the AA genotype.

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Objectives: To examine whether single-nucleotide polymorphisms (SNPs) in VEGFA (-2578 C/A and +936 C/T) associate with small-for-gestational-age (SGA) pregnancies and to identify their effects on first-trimester placental VEGFA expression.

Design: Multicenter prospective cohort study.

Settings: Adelaide, Australia, and Auckland, New Zealand.

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