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Fetal sex and maternal pregnancy outcomes: a systematic review and meta-analysis.

ABSTRACT: BACKGROUND:Since the placenta also has a sex, fetal sex-specific differences in the occurrence of placenta-mediated complications could exist. OBJECTIVE:To determine the association of fetal sex with multiple maternal pregnancy complications. SEARCH STRATEGY:Six electronic databases Ovid MEDLINE, EMBASE, Cochrane Central, Web-of-Science, PubMed, and Google Scholar were systematically searched to identify eligible studies. Reference lists of the included studies and contact with experts were also used for identification of studies. SELECTION CRITERIA:Observational studies that assessed fetal sex and the presence of maternal pregnancy complications within singleton pregnancies. DATA COLLECTION AND ANALYSES:Data were extracted by 2 independent reviewers using a predesigned data collection form. MAIN RESULTS:From 6522 original references, 74 studies were selected, including over 12,5 million women. Male fetal sex was associated with term pre-eclampsia (pooled OR 1.07 [95%CI 1.06 to 1.09]) and gestational diabetes (pooled OR 1.04 [1.02 to 1.07]). All other pregnancy complications (i.e., gestational hypertension, total pre-eclampsia, eclampsia, placental abruption, and post-partum hemorrhage) tended to be associated with male fetal sex, except for preterm pre-eclampsia, which was more associated with female fetal sex. Overall quality of the included studies was good. Between-study heterogeneity was high due to differences in study population and outcome definition. CONCLUSION:This meta-analysis suggests that the occurrence of pregnancy complications differ according to fetal sex with a higher cardiovascular and metabolic load for the mother in the presence of a male fetus. FUNDING:None.

SUBMITTER: Broere-Brown ZA

PROVIDER: S-EPMC7216628 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Fetal sex and maternal pregnancy outcomes: a systematic review and meta-analysis.

Broere-Brown Zoe A ZA Adank Maria C MC Benschop Laura L Tielemans Myrte M Muka Taulant T Gonçalves Romy R Bramer Wichor M WM Schoufour Josje D JD Voortman Trudy T Steegers Eric A P EAP Franco Oscar H OH Schalekamp-Timmermans Sarah S

Biology of sex differences 20200511 1

<h4>Background</h4>Since the placenta also has a sex, fetal sex-specific differences in the occurrence of placenta-mediated complications could exist.<h4>Objective</h4>To determine the association of fetal sex with multiple maternal pregnancy complications.<h4>Search strategy</h4>Six electronic databases Ovid MEDLINE, EMBASE, Cochrane Central, Web-of-Science, PubMed, and Google Scholar were systematically searched to identify eligible studies. Reference lists of the included studies and contact ...[more]

PMID: 32393396

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Project description:BackgroundBiologic medications, specifically tumour necrosis factor-α (TNF-α) inhibitors, have become increasingly prevalent in the treatment of chronic inflammatory disease (CID) in pregnancy.ObjectiveTo determine pregnancy outcomes in women with CID exposed to biologics during pregnancy.Search strategyPubMed and EMBASE databases were searched through January 1998-July 2021.Selection criteriaPeer-reviewed, English-language cohort, case-control, cross-sectional studies, and case series that contained original data.Data collection and analysisTwo authors independently conducted data extraction. A meta-analysis of proportions using a random-effects model was used to pool outcomes. Linear regression analysis was used to compare the mean of proportions of outcomes across exposure groups using the 'treated' group as the reference category. All studies were evaluated using an appropriate quality assessment tool. The GRADE approach was used to assess the overall certainty of evidence.Main resultsThirty-five studies, describing 11 172 pregnancies, were eligible for inclusion. Analysis showed pooled proportions for congenital malformations as follows: treated 0.04 (95% CI 0.03-0.04; I2 = 77) versus disease-matched 0.04 (95% CI 0.03-0.05. I2 = 86; p = 0.238); preterm delivery treated 0.04 (95% CI 0.10-0.14; I2 = 88) versus disease-matched 0.10 (95% CI 0.09-0.12; I2 = 87; p = 0.250); severe neonatal infection: treated 0.05 (95% CI 0.03-0.07; I2 = 88) versus disease-matched 0.05 (95% CI 0.02-0.07; I2 = 94; p = 0.970); low birthweight: treated 0.10 (95% CI 0.07-0.12; I2 = 93) versus disease-matched 0.08 (95% CI 0.07-0.09; I2 = 0; p = 0.241); pooled miscarriage: treated 0.13 (95% CI 0.10-0.15; I2 = 77) versus disease-matched 0.08 (95% CI 0.04-0.11; I2 = 5; p = 0.078); pre-eclampsia; treated 0.01 (95% CI 0.01-0.02; I2 = 0) versus disease-matched 0.01 (95% CI 0.00-0.01; I2 = 0; p = 0.193). No statistical differences in proportions were observed. GRADE certainty of findings was low to very low.ConclusionWe demonstrated comparable pregnancy outcomes in pregnancies exposed to biologics, disease-matched controls and CID-free pregnancies using the GRADE approach.

Project description:BackgroundMaternal infection with cholera may negatively affect pregnancy outcomes. The objective of this research is to systematically review the literature and determine the risk of fetal, neonatal and maternal death associated with cholera during pregnancy.Materials and methodsMedline, Global Health Library, and Cochrane Library databases were searched using the key terms cholera and pregnancy for articles published in any language and at any time before August 2013 to quantitatively summarize estimates of fetal, maternal, and neonatal mortality. 95% confidence intervals (CIs) were calculated for each selected study. Random-effect non-linear logistic regression was used to calculate pooled rates and 95% CIs by time period. Studies from the recent period (1991-2013) were compared with studies from 1969-1990. Relative risk (RR) estimates and 95% CIs were obtained by comparing mortality of selected recent studies with published national normative data from the closest year.ResultsThe meta-analysis included seven studies that together involved 737 pregnant women with cholera from six countries. The pooled fetal death rate for 4 studies during 1991-2013 was 7.9% (95% CIs 5.3-10.4), significantly lower than that of 3 studies from 1969-1990 (31.0%, 95% CIs 25.2-36.8). There was no difference in fetal death rate by trimester. The pooled neonatal death rate for 1991-2013 studies was 0.8% (95% CIs 0.0-1.6), and 6.4% (95% CIs 0.0-20.8) for 1969-1990. The pooled maternal death rate for 1991-2013 studies was 0.2% (95% CIs 0.0-0.7), and 5.0% (95% CIs 0.0-16.0) for 1969-1990. Compared with published national mortality estimates, the RR for fetal death of 5.8 (95% CIs 2.9-11.3) was calculated for Haiti (2013), 1.8 (95% CIs 0.3-10.4) for Senegal (2007), and 2.6 (95% CIs 0.5-14.9) for Peru (1991); there were no significant differences in the RR for neonatal or maternal death.ConclusionResults are limited by the inconsistencies found across included studies but suggest that maternal cholera is associated with adverse pregnancy outcomes, particularly fetal death. These findings can inform a research agenda on cholera in pregnancy and guidance for the timely management of pregnant women with cholera.

Project description:STUDY QUESTION:How is endometriosis associated with adverse maternal, fetal and neonatal outcomes of pregnancy? SUMMARY ANSWER:Women with endometriosis are at elevated risk for serious and important adverse maternal (pre-eclampsia, gestational diabetes, placenta praevia and Cesarean section) and fetal or neonatal outcomes (preterm birth, PPROM, small for gestational age, stillbirth and neonatal death). WHAT IS KNOWN ALREADY:A number of studies have shown an association between endometriosis and certain adverse maternal and fetal outcomes, but the results have been conflicting with potential for confounding by the use of assisted reproductive technology. STUDY DESIGN, SIZE, DURATION:A systematic review and meta-analysis of observational studies (1 January 1990-31 December 2017) that evaluated the effect of endometriosis on maternal, fetal and neonatal outcomes was conducted. PARTICIPANTS/MATERIALS, SETTING, METHODS:Studies were considered for inclusion if they were prospective or retrospective cohort or case-control studies; included women greater than 20 weeks gestational age with endometriosis; included a control group of gravid women without endometriosis; and, reported at least one of the outcomes of interest. Each study was reviewed for inclusion, data were extracted and risk of bias was assessed by two independent reviewers. MAIN RESULTS AND THE ROLE OF CHANCE:The search strategy identified 33 studies (sample size, n = 3 280 488) for inclusion. Compared with women without endometriosis, women with endometriosis had higher odds of pre-eclampsia (odds ratio [OR] = 1.18 [1.01-1.39]), gestational hypertension and/or pre-eclampsia (OR = 1.21 [1.05-1.39]), gestational diabetes (OR = 1.26 [1.03-1.55]), gestational cholestasis (OR = 4.87 [1.85-12.83]), placenta praevia (OR = 3.31 [2.37, 4.63]), antepartum hemorrhage (OR = 1.69 [1.38-2.07]), antepartum hospital admissions (OR = 3.18 [2.60-3.87]), malpresentation (OR = 1.71 [1.34, 2.18]), labor dystocia (OR = 1.45 [1.04-2.01]) and cesarean section (OR = 1.86 [1.51-2.29]). Fetuses and neonates of women with endometriosis were also more likely to have preterm premature rupture of membranes (OR = 2.33 [1.39-3.90]), preterm birth (OR = 1.70 [1.40-2.06]), small for gestational age <10th% (OR = 1.28 [1.11-1.49]), NICU admission (OR = 1.39 [1.08-1.78]), stillbirth (OR = 1.29 [1.10, 1.52]) and neonatal death (MOR = 1.78 [1.46-2.16]). Among the subgroup of women who conceived spontaneously, endometriosis was found to be associated with placenta praevia, cesarean section, preterm birth and low birth weight. Among the subgroup of women who conceived with the use of assisted reproductive technology, endometriosis was found to be associated with placenta praevia and preterm birth. LIMITATIONS, REASONS FOR CAUTION:As with any systematic review, the review is limited by the quality of the included studies. The diagnosis for endometriosis and the selection of comparison groups were not uniform across studies. However, the effect of potential misclassification would be bias towards the null hypothesis. WIDER IMPLICATIONS OF THE FINDINGS:The association between endometriosis with the important and serious pregnancy outcomes observed in our meta-analysis, in particular stillbirth and neonatal death, is concerning and warrants further studies to elucidate the mechanisms for the observed findings. STUDY FUNDING/COMPETING INTEREST(S):Dr Shifana Lalani is supported by a Physicians' Services Incorporated Foundation Research Grant, and Dr Innie Chen is supported by a University of Ottawa Clinical Research Chair in Reproductive Population Health and Health Services. Dr Singh declares conflicts of interests with Bayer, Abvie, Allergan and Cooper Surgical. All other authors have no conflicts of interests to declare. REGISTRATION NUMBER:PROSPERO CRD42015013911.

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Fetal sex and maternal pregnancy outcomes: a systematic review and meta-analysis.

Publications

Fetal sex and maternal pregnancy outcomes: a systematic review and meta-analysis.

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