SARS‐CoV‐2 infection in pregnancy during the first wave of COVID‐19 in the Netherlands: a prospective nationwide population‐based cohort study (NethOSS)

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Abstract

Objective

To describe characteristics, risk factors and maternal, obstetric and neonatal outcomes of pregnant women infected with severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2).

Design

Multi‐centre prospective population‐based cohort study.

Setting

Nationwide study in the Netherlands.

Population

Pregnant women with confirmed SARS‐CoV‐2 infection admitted to hospital or in home‐isolation: 1 March 2020 to 31 August 2020.

Methods

Pregnant women with positive polymerase chain reaction or antibody tests were registered using the Netherlands Obstetrics Surveillance System (NethOSS). (Selective) testing occurred according to national guidelines. Data from the national birth registry (pregnant pre‐coronavirus disease 2019 [COVID‐19] cohort) and an age‐matched cohort of COVID‐19‐positive women (National Institute for Public Health and the Environment; fertile age COVID‐19 cohort) were used as reference.

Main outcome measures

Incidence of SARS‐CoV‐2 infection in pregnant women. Maternal, obstetric and neonatal outcomes including hospital and intensive care admission.

Results

Of 376 registered pregnant women with confirmed SARS‐CoV‐2 infection, 20% (74/376) were admitted to hospital, of whom 84% (62/74) were due to SARS‐CoV‐2; 10% (6/62) were admitted to intensive care and 15% (9/62) to obstetric high‐care units. Risk factors for admission were non‐European country of origin (odds ratio [OR] 1.73, 95% CI 1.01–2.96) and being overweight/obese (OR 1.86, 95% CI 1.51–3.20). No maternal or perinatal deaths occurred. Caesarean section after labour‐onset was increased (OR 1.58, 95% CI 1.09–2.28). Hospital and intensive care admission were higher compared with the fertile age COVID‐19 cohort (OR 6.75, 95% CI 5.18–8.81 and OR 2.52, 95% CI 1.11–5.77, respectively).

Conclusions

Non‐European country of origin and being overweight/obese are risk factors for severe course of SARS‐CoV‐2 infection in pregnancy, risk of caesarean section and hospital and intensive care unit admission are increased.

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Pregnant women with SARS‐CoV‐2 in the Netherlands show increased hospital/ICU admission and caesarean section.

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Pregnant women with SARS‐CoV‐2 in the Netherlands show increased hospital/ICU admission and caesarean section.

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Features of 20 133 UK patients in hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: prospective observational cohort study

Annemarie Docherty, Ewen Harrison, Christopher A Green … (2020)

Abstract Objective To characterise the clinical features of patients admitted to hospital with coronavirus disease 2019 (covid-19) in the United Kingdom during the growth phase of the first wave of this outbreak who were enrolled in the International Severe Acute Respiratory and emerging Infections Consortium (ISARIC) World Health Organization (WHO) Clinical Characterisation Protocol UK (CCP-UK) study, and to explore risk factors associated with mortality in hospital. Design Prospective observational cohort study with rapid data gathering and near real time analysis. Setting 208 acute care hospitals in England, Wales, and Scotland between 6 February and 19 April 2020. A case report form developed by ISARIC and WHO was used to collect clinical data. A minimal follow-up time of two weeks (to 3 May 2020) allowed most patients to complete their hospital admission. Participants 20 133 hospital inpatients with covid-19. Main outcome measures Admission to critical care (high dependency unit or intensive care unit) and mortality in hospital. Results The median age of patients admitted to hospital with covid-19, or with a diagnosis of covid-19 made in hospital, was 73 years (interquartile range 58-82, range 0-104). More men were admitted than women (men 60%, n=12 068; women 40%, n=8065). The median duration of symptoms before admission was 4 days (interquartile range 1-8). The commonest comorbidities were chronic cardiac disease (31%, 5469/17 702), uncomplicated diabetes (21%, 3650/17 599), non-asthmatic chronic pulmonary disease (18%, 3128/17 634), and chronic kidney disease (16%, 2830/17 506); 23% (4161/18 525) had no reported major comorbidity. Overall, 41% (8199/20 133) of patients were discharged alive, 26% (5165/20 133) died, and 34% (6769/20 133) continued to receive care at the reporting date. 17% (3001/18 183) required admission to high dependency or intensive care units; of these, 28% (826/3001) were discharged alive, 32% (958/3001) died, and 41% (1217/3001) continued to receive care at the reporting date. Of those receiving mechanical ventilation, 17% (276/1658) were discharged alive, 37% (618/1658) died, and 46% (764/1658) remained in hospital. Increasing age, male sex, and comorbidities including chronic cardiac disease, non-asthmatic chronic pulmonary disease, chronic kidney disease, liver disease and obesity were associated with higher mortality in hospital. Conclusions ISARIC WHO CCP-UK is a large prospective cohort study of patients in hospital with covid-19. The study continues to enrol at the time of this report. In study participants, mortality was high, independent risk factors were increasing age, male sex, and chronic comorbidity, including obesity. This study has shown the importance of pandemic preparedness and the need to maintain readiness to launch research studies in response to outbreaks. Study registration ISRCTN66726260.

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Clinical manifestations, risk factors, and maternal and perinatal outcomes of coronavirus disease 2019 in pregnancy: living systematic review and meta-analysis

John Allotey, Elena Stallings, Mercedes Bonet … (2020)

Abstract Objective To determine the clinical manifestations, risk factors, and maternal and perinatal outcomes in pregnant and recently pregnant women with suspected or confirmed coronavirus disease 2019 (covid-19). Design Living systematic review and meta-analysis. Data sources Medline, Embase, Cochrane database, WHO COVID-19 database, China National Knowledge Infrastructure (CNKI), and Wanfang databases from 1 December 2019 to 26 June 2020, along with preprint servers, social media, and reference lists. Study selection Cohort studies reporting the rates, clinical manifestations (symptoms, laboratory and radiological findings), risk factors, and maternal and perinatal outcomes in pregnant and recently pregnant women with suspected or confirmed covid-19. Data extraction At least two researchers independently extracted the data and assessed study quality. Random effects meta-analysis was performed, with estimates pooled as odds ratios and proportions with 95% confidence intervals. All analyses will be updated regularly. Results 77 studies were included. Overall, 10% (95% confidence interval 7% to14%; 28 studies, 11 432 women) of pregnant and recently pregnant women attending or admitted to hospital for any reason were diagnosed as having suspected or confirmed covid-19. The most common clinical manifestations of covid-19 in pregnancy were fever (40%) and cough (39%). Compared with non-pregnant women of reproductive age, pregnant and recently pregnant women with covid-19 were less likely to report symptoms of fever (odds ratio 0.43, 95% confidence interval 0.22 to 0.85; I2=74%; 5 studies; 80 521 women) and myalgia (0.48, 0.45 to 0.51; I2=0%; 3 studies; 80 409 women) and were more likely to need admission to an intensive care unit (1.62, 1.33 to 1.96; I2=0%) and invasive ventilation (1.88, 1.36 to 2.60; I2=0%; 4 studies, 91 606 women). 73 pregnant women (0.1%, 26 studies, 11 580 women) with confirmed covid-19 died from any cause. Increased maternal age (1.78, 1.25 to 2.55; I2=9%; 4 studies; 1058 women), high body mass index (2.38, 1.67 to 3.39; I2=0%; 3 studies; 877 women), chronic hypertension (2.0, 1.14 to 3.48; I2=0%; 2 studies; 858 women), and pre-existing diabetes (2.51, 1.31 to 4.80; I2=12%; 2 studies; 858 women) were associated with severe covid-19 in pregnancy. Pre-existing maternal comorbidity was a risk factor for admission to an intensive care unit (4.21, 1.06 to 16.72; I2=0%; 2 studies; 320 women) and invasive ventilation (4.48, 1.40 to 14.37; I2=0%; 2 studies; 313 women). Spontaneous preterm birth rate was 6% (95% confidence interval 3% to 9%; I2=55%; 10 studies; 870 women) in women with covid-19. The odds of any preterm birth (3.01, 95% confidence interval 1.16 to 7.85; I2=1%; 2 studies; 339 women) was high in pregnant women with covid-19 compared with those without the disease. A quarter of all neonates born to mothers with covid-19 were admitted to the neonatal unit (25%) and were at increased risk of admission (odds ratio 3.13, 95% confidence interval 2.05 to 4.78, I2=not estimable; 1 study, 1121 neonates) than those born to mothers without covid-19. Conclusion Pregnant and recently pregnant women are less likely to manifest covid-19 related symptoms of fever and myalgia than non-pregnant women of reproductive age and are potentially more likely to need intensive care treatment for covid-19. Pre-existing comorbidities, high maternal age, and high body mass index seem to be risk factors for severe covid-19. Preterm birth rates are high in pregnant women with covid-19 than in pregnant women without the disease. Systematic review registration PROSPERO CRD42020178076. Readers’ note This article is a living systematic review that will be updated to reflect emerging evidence. Updates may occur for up to two years from the date of original publication.

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Characteristics and outcomes of pregnant women admitted to hospital with confirmed SARS-CoV-2 infection in UK: national population based cohort study

Marian Knight, Kathryn J Bunch, Nicola Vousden … (2020)

Abstract Objectives To describe a national cohort of pregnant women admitted to hospital with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in the UK, identify factors associated with infection, and describe outcomes, including transmission of infection, for mothers and infants. Design Prospective national population based cohort study using the UK Obstetric Surveillance System (UKOSS). Setting All 194 obstetric units in the UK. Participants 427 pregnant women admitted to hospital with confirmed SARS-CoV-2 infection between 1 March 2020 and 14 April 2020. Main outcome measures Incidence of maternal hospital admission and infant infection. Rates of maternal death, level 3 critical care unit admission, fetal loss, caesarean birth, preterm birth, stillbirth, early neonatal death, and neonatal unit admission. Results The estimated incidence of admission to hospital with confirmed SARS-CoV-2 infection in pregnancy was 4.9 (95% confidence interval 4.5 to 5.4) per 1000 maternities. 233 (56%) pregnant women admitted to hospital with SARS-CoV-2 infection in pregnancy were from black or other ethnic minority groups, 281 (69%) were overweight or obese, 175 (41%) were aged 35 or over, and 145 (34%) had pre-existing comorbidities. 266 (62%) women gave birth or had a pregnancy loss; 196 (73%) gave birth at term. Forty one (10%) women admitted to hospital needed respiratory support, and five (1%) women died. Twelve (5%) of 265 infants tested positive for SARS-CoV-2 RNA, six of them within the first 12 hours after birth. Conclusions Most pregnant women admitted to hospital with SARS-CoV-2 infection were in the late second or third trimester, supporting guidance for continued social distancing measures in later pregnancy. Most had good outcomes, and transmission of SARS-CoV-2 to infants was uncommon. The high proportion of women from black or minority ethnic groups admitted with infection needs urgent investigation and explanation. Study registration ISRCTN 40092247.

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Author and article information

Contributors

EM Overtoom:

ORCID: https://orcid.org/0000-0001-6454-4531

e.m.overtoom@umcutrecht.nl

Journal

Journal ID (nlm-ta): BJOG

Journal ID (iso-abbrev): BJOG

Journal ID (doi): 10.1111/(ISSN)1471-0528

Journal ID (publisher-id): BJO

Title: Bjog

Publisher: John Wiley and Sons Inc. (Hoboken )

ISSN (Print): 1470-0328

ISSN (Electronic): 1471-0528

Publication date (Electronic): 26 September 2021

Publication date PMC-release: 26 September 2021

Electronic Location Identifier: 10.1111/1471-0528.16903

Affiliations

[ ¹ ] Department of Obstetrics Women and Baby Division Birth Centre Wilhelmina Children Hospital University Medical Centre Utrecht Utrecht The Netherlands

[ ² ] Department of Obstetrics and Gynaecology Diakonessenhuis Utrecht The Netherlands

[ ³ ] Perined Utrecht The Netherlands

[ ⁴ ] Department of Obstetrics and Gynaecology Deventer Hospital Deventer The Netherlands

[ ⁵ ] Department of Obstetrics and Gynaecology Leiden University Medical Centre Leiden The Netherlands

[ ⁶ ] Athena Institute VU University Amsterdam The Netherlands

Author notes

[*] [* ] Correspondence: EM Overtoom, University Medical Centre Utrecht, Postbus 20075, 3502 LB Utrecht, The Netherlands. Email: e.m.overtoom@ 123456umcutrecht.nl

Author information

EM Overtoom https://orcid.org/0000-0001-6454-4531

Article

Publisher ID: BJO16903

DOI: 10.1111/1471-0528.16903

PMC ID: 8652526

PubMed ID: 34494694

SO-VID: 52d18619-bc7e-4f32-a179-626ad68c34cc

License:

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

History

Date accepted : 23 March 2021

Page count

Figures: 0, Tables: 4, Pages: 10, Words: 13802

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ScienceOpen disciplines: Obstetrics & Gynecology

Keywords: coronavirus disease 2019,obstetric surveillance system,pregnancy,pregnancy complications,severe acute respiratory syndrome coronavirus 2

Data availability:

ScienceOpen disciplines: Obstetrics & Gynecology

Keywords: coronavirus disease 2019, obstetric surveillance system, pregnancy, pregnancy complications, severe acute respiratory syndrome coronavirus 2

SARS‐CoV‐2 infection in pregnancy during the first wave of COVID‐19 in the Netherlands: a prospective nationwide population‐based cohort study (NethOSS)

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Most cited references 28

Features of 20 133 UK patients in hospital with covid-19 using the ISARIC WHO Clinical Characterisation Protocol: prospective observational cohort study

Clinical manifestations, risk factors, and maternal and perinatal outcomes of coronavirus disease 2019 in pregnancy: living systematic review and meta-analysis

Characteristics and outcomes of pregnant women admitted to hospital with confirmed SARS-CoV-2 infection in UK: national population based cohort study

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