Time trends in antithrombotic therapy during pregnancy and maternal and perinatal outcomes in the Netherlands (2013-19): a nationwide cohort study.

Background: Considering the paucity of data, we aimed to describe nationwide time trends in antithrombotic therapy during pregnancy and risks of maternal and perinatal outcomes in the Netherlands.

Methods: In this nationwide cohort study, all female individuals aged 16-45 years with delivery records in the Dutch perinatal registry between Jan 1, 2013, and Dec 31, 2019, and their infants, were included. Individually linked data from Statistics Netherlands on outpatient medication prescriptions, in-hospital diagnoses, and mortality were used to evaluate time trends in antithrombotic therapy during pregnancy, and risks of maternal and perinatal outcomes (including thromboembolism, bleeding, preeclampsia and eclampsia, and low birthweight).

Stillbirth risk by fetal size among 126.5 million births in 15 countries from 2000 to 2020: A fetuses-at-risk approach.

Objective: To compare stillbirth rates and risks for small for gestational age (SGA), large for gestational age (LGA) and appropriate for gestational age (AGA) pregnancies at 24-44 completed weeks of gestation using a birth-based and fetuses-at-risk approachs.

Design: Population-based, multi-country study.

Setting: National data systems in 15 high- and middle-income countries.

Socioeconomic disparities in changes to preterm birth and stillbirth rates during the first year of the COVID-19 pandemic: a study of 21 European countries.

Background: Despite concerns about worsening pregnancy outcomes resulting from healthcare restrictions, economic difficulties and increased stress during the COVID-19 pandemic, preterm birth (PTB) rates declined in some countries in 2020, while stillbirth rates appeared stable. Like other shocks, the pandemic may have exacerbated existing socioeconomic disparities in pregnancy, but this remains to be established. Our objective was to investigate changes in PTB and stillbirth by socioeconomic status (SES) in European countries.

Neurodevelopmental outcome at 5.5 years in Dutch preterm infants born at 24-26 weeks' gestational age: the EPI-DAF study.

Objective: After lowering the Dutch threshold for active treatment from 25 to 24 completed weeks' gestation, survival to discharge increased by 10% in extremely preterm live born infants. Now that this guideline has been implemented, an accurate description of neurodevelopmental outcome at school age is needed.

Design: Population-based cohort study.

Stillbirths: Contribution of preterm birth and size-for-gestational age for 125.4 million total births from nationwide records in 13 countries, 2000-2020.

Objective: To examine the contribution of preterm birth and size-for-gestational age in stillbirths using six 'newborn types'.

Design: Population-based multi-country analyses.

Setting: Births collected through routine data systems in 13 countries.

Increasing trends in a low 5-min Apgar score among (near) term singletons: a Dutch nationwide cohort study.

Objective: To investigate trends in low Apgar scores in (near) term singletons using the Dutch Perinatal Registry.

Methods: In a cohort of 1,583,188 singletons liveborn ≥35 weeks of gestation in the period 2010-2019, we studied trends in low 5-min Apgar scores (<7 and <4) using Cochrane Armitage trend tests.

Results: The proportion of infants with low Apgar scores <7 and <4 increased significantly between 2010-2019 (1.

Neonatal mortality risk for vulnerable newborn types in 15 countries using 125.5 million nationwide birth outcome records, 2000-2020.

Objective: To compare neonatal mortality associated with six novel vulnerable newborn types in 125.5 million live births across 15 countries, 2000-2020.

Design: Population-based, multi-country study.

Vulnerable newborn types: Analysis of population-based registries for 165 million births in 23 countries, 2000-2021.

Objective: To examine the prevalence of novel newborn types among 165 million live births in 23 countries from 2000 to 2021.

Design: Population-based, multi-country analysis.

Setting: National data systems in 23 middle- and high-income countries.

Reactogenicity and safety of second trimester maternal tetanus, diphtheria and acellular pertussis vaccination in the Netherlands.

Background: Maternal tetanus-diphtheria-and-acellular-pertussis (Tdap) vaccination is offered to all pregnant women during their second trimester in the Netherlands since December 2019. We assessed second trimester Tdap vaccination reactogenicity and compared with third trimester data from a similar study. For safety assessment, adverse pregnancy outcomes were compared with national data from 2018, before Tdap vaccine-introduction.

A congenital CSF3R mutation in chronic neutropenia reveals a vital role for a cytokine receptor extracellular hinge motif in the response to granulocyte colony-stimulating factor.

We describe a patient with congenital neutropenia (CN) with a homozygous germline mutation in the colony-stimulating factor 3 receptor gene (CSF3R). The patient's bone marrow shows lagging neutrophil development with subtle left shift and unresponsiveness to CSF3 in in vitro colony assays. This patient illustrates that the di-proline hinge motif in the extracellular cytokine receptor homology domain of CSF3R is critical for adequate neutrophil production, but dispensable for in vivo terminal neutrophil maturation.

Clarity and consistency in stillbirth reporting in Europe: why is it so hard to get this right?

Background: Stillbirth is a major public health problem, but measurement remains a challenge even in high-income countries. We compared routine stillbirth statistics in Europe reported by Eurostat with data from the Euro-Peristat research network.

Methods: We used data on stillbirths in 2015 from both sources for 31 European countries.

Mortality and readmission rates among hospitalized COVID-19 patients with varying stages of chronic kidney disease: a multicenter retrospective cohort.

Chronic kidney disease (CKD) has been recognized as a highly prevalent risk factor for both the severity of coronavirus disease 2019 (COVID-19) and COVID-19 associated adverse outcomes. In this multicenter observational cohort study, we aim to determine mortality and readmission rates of patients hospitalized for COVID-19 across varying CKD stages. We performed a multicenter cohort study among COVID-19 patients included in the Dutch COVIDPredict cohort.

Survival and causes of death in extremely preterm infants in the Netherlands.

Objective: In the Netherlands, the threshold for offering active treatment for spontaneous birth was lowered from 25 to 24 weeks' gestation in 2010. This study aimed to evaluate the impact of guideline implementation on survival and causes and timing of death in the years following implementation.

Design: National cohort study, using data from the Netherlands Perinatal Registry.

Cohort profile: the PHARMO Perinatal Research Network (PPRN) in the Netherlands: a population-based mother-child linked cohort.

Purpose: Observational population-based research is a very suitable non-invasive method for studies in the vulnerable populations of pregnant women and children. Therefore, the PHARMO Perinatal Research Network (PPRN) was set up as a resource for life course perinatal and paediatric research by linking population-based data from existing registrations.

Participants: From 1999 to 2017, the PPRN captures approximately 542 900 pregnancies of 387 100 mothers ('Pregnancy Cohort').

A framework to bridge scales in distribution modeling of soil microbiota.

Creating accurate habitat suitability and distribution models (HSDMs) for soil microbiota is far more challenging than for aboveground organism groups. In this perspective paper, we propose a conceptual framework that addresses several of the critical issues holding back further applications. Most importantly, we tackle the mismatch between the broadscale, long-term averages of environmental variables traditionally used, and the environment as experienced by soil microbiota themselves.

[Decrease in foetal and neonatal mortality in the Netherlands; comparison with other Euro-Peristat countries in 2004, 2010 and 2015].

Objective: To compare changes in foetal, neonatal and perinatal mortality in the Netherlands in 2015, relative to 2004 and 2010, with changes in other European countries and regions.

Design: Descriptive population-wide study.

Method: Data from 32 European countries and regions within the Euro-Peristat registration area were analysed.

Cross-Sectional Study on MRI Restaging After Chemoradiotherapy and Interval to Surgery in Rectal Cancer: Influence on Short- and Long-Term Outcomes.

Background: The time interval between CRT and surgery in rectal cancer patients is still the subject of debate. The aim of this study was to first evaluate the nationwide use of restaging magnetic resonance imaging (MRI) and its impact on timing of surgery, and, second, to evaluate the impact of timing of surgery after chemoradiotherapy (CRT) on short- and long-term outcomes.

Methods: Patients were selected from a collaborative rectal cancer research project including 71 Dutch centres, and were subdivided into two groups according to time interval from the start of preoperative CRT to surgery (< 14 and ≥ 14 weeks).

Sequential gain of mutations in severe congenital neutropenia progressing to acute myeloid leukemia.

Severe congenital neutropenia (SCN) is a BM failure syndrome with a high risk of progression to acute myeloid leukemia (AML). The underlying genetic changes involved in SCN evolution to AML are largely unknown. We obtained serial hematopoietic samples from an SCN patient who developed AML 17 years after the initiation of G-CSF treatment.

Erythropoietin-induced activation of STAT5 is impaired in the myelodysplastic syndrome.

Patients with myelodysplastic syndrome (MDS) have ineffective in vivo and in vitro erythropoiesis, characterized by an impaired response to erythropoietin (Epo). We examined proliferation and maturation of MDS marrow cells in response to Epo in more detail. Epo-dependent DNA synthesis as well as induction of GATA-1 binding activity in marrow cells from 15 MDS cases were severely reduced as compared with normal bone marrow (NBM).

Erythropoiesis in myelodysplastic syndrome: expression of receptors for erythropoietin and kit ligand.

Ineffective erythropoiesis due to an impaired response to erythropoietin (EPO) is a prominent abnormality in myelodysplastic syndromes (MDS). The growth factor kit ligand (KL) may restore the in vitro erythroid colony-forming response to EPO in a subset of patients. The inability of MDS erythroid progenitors to react properly to EPO and/or KL has not been resolved.

Blast colony-forming cells in myelodysplastic syndrome: decreased potential to generate erythroid precursors.

In vitro colony-forming abilities of highly purified primitive hematopoietic cells in eight cases of myelodysplastic syndrome (MDS) were studied using the blast cell colony assay. Blast cell colony formation from seven normal bone marrow (NBM) samples was studied in parallel. Blast cell colonies were formed in 7/8 cases of MDS, the numbers not significantly differing from those generated by NBM.

Kit ligand improves in vitro erythropoiesis in myelodysplastic syndrome.

Erythropoiesis in response to erythropoietin (Epo) in myelodysplastic syndrome (MDS) in vitro and in vivo is severely impaired. We investigated the stimulative effect of c-kit ligand (KL) on the erythroid colony-forming abilities of bone marrow cells from 17 patients with MDS. The effects of normal donor-derived marrow were examined in comparison.

Positive and negative effects of tumor necrosis factor on colony growth from highly purified normal marrow progenitors.

The effects of recombinant human tumor necrosis factor alpha (TNF alpha) on colony growth were studied using highly enriched progenitor cells from normal human bone marrow. Supplementation of TNF to culture resulted in a dose-dependent suppression of granulocyte colony-stimulating factor (G-CSF) induced granulocytic colony formation and also erythropoietin (Epo) induced erythroid burst formation. However, the number of erythroid bursts, stimulated by interleukin-3 (IL-3) plus Epo, increased when TNF was added at comparable concentrations.