BMC Pregnancy and Childbirth (Apr 2021)

The association between SARS-CoV-2 infection and preterm delivery: a prospective study with a multivariable analysis

  • Oscar Martinez-Perez,
  • Pilar Prats Rodriguez,
  • Marta Muner Hernandez,
  • Maria Begoña Encinas Pardilla,
  • Noelia Perez Perez,
  • Maria Rosa Vila Hernandez,
  • Ana Villalba Yarza,
  • Olga Nieto Velasco,
  • Pablo Guillermo Del Barrio Fernandez,
  • Laura Forcen Acebal,
  • Carmen Maria Orizales Lago,
  • Alicia Martinez Varea,
  • Begoña Muñoz Abellana,
  • Maria Suarez Arana,
  • Laura Fuentes Ricoy,
  • Clara Martinez Diago,
  • Maria Jesus Janeiro Freire,
  • Macarena Alférez Alvarez-Mallo,
  • Cristina Casanova Pedraz,
  • Onofre Alomar Mateu,
  • Cristina Lesmes Heredia,
  • Juan Carlos Wizner de Alva,
  • Rut Bernardo Vega,
  • Montserrat Macia Badia,
  • Cristina Alvarez Colomo,
  • Antonio Sanchez Muñoz,
  • Laia Pratcorona Alicart,
  • Ruben Alonso Saiz,
  • Monica Lopez Rodriguez,
  • Maria del Carmen Barbancho Lopez,
  • Marta Ruth Meca Casbas,
  • Oscar Vaquerizo Ruiz,
  • Eva Moran Antolin,
  • Maria Jose Nuñez Valera,
  • Camino Fernandez Fernandez,
  • Albert Tubau Navarra,
  • Alejandra Maria Cano Garcia,
  • Carmen Baena Luque,
  • Susana Soldevilla Perez,
  • Irene Gastaca Abasolo,
  • Jose Adanez Garcia,
  • Maria Teulon Gonzalez,
  • Alberto Puertas Prieto,
  • Rosa Ostos Serna,
  • Maria del Pilar Guadix Martin,
  • Monica Catalina Coello,
  • Elena Ferriols Perez,
  • Africa Caño Aguilar,
  • Maria Luisa De la Cruz Conty,
  • Jose Antonio Sainz Bueno,
  • Spanish Obstetric Emergency Group

DOI
https://doi.org/10.1186/s12884-021-03742-4
Journal volume & issue
Vol. 21, no. 1
pp. 1 – 11

Abstract

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Abstract Background To determine whether severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2, the cause of COVID-19 disease) exposure in pregnancy, compared to non-exposure, is associated with infection-related obstetric morbidity. Methods We conducted a multicentre prospective study in pregnancy based on a universal antenatal screening program for SARS-CoV-2 infection. Throughout Spain 45 hospitals tested all women at admission on delivery ward using polymerase-chain-reaction (PCR) for COVID-19 since late March 2020. The cohort of positive mothers and the concurrent sample of negative mothers was followed up until 6-weeks post-partum. Multivariable logistic regression analysis, adjusting for known confounding variables, determined the adjusted odds ratio (aOR) with 95% confidence intervals (95% CI) of the association of SARS-CoV-2 infection and obstetric outcomes. Main outcome measures: Preterm delivery (primary), premature rupture of membranes and neonatal intensive care unit admissions. Results Among 1009 screened pregnancies, 246 were SARS-CoV-2 positive. Compared to negative mothers (763 cases), SARS-CoV-2 infection increased the odds of preterm birth (34 vs 51, 13.8% vs 6.7%, aOR 2.12, 95% CI 1.32–3.36, p = 0.002); iatrogenic preterm delivery was more frequent in infected women (4.9% vs 1.3%, p = 0.001), while the occurrence of spontaneous preterm deliveries was statistically similar (6.1% vs 4.7%). An increased risk of premature rupture of membranes at term (39 vs 75, 15.8% vs 9.8%, aOR 1.70, 95% CI 1.11–2.57, p = 0.013) and neonatal intensive care unit admissions (23 vs 18, 9.3% vs 2.4%, aOR 4.62, 95% CI 2.43–8.94, p < 0.001) was also observed in positive mothers. Conclusion This prospective multicentre study demonstrated that pregnant women infected with SARS-CoV-2 have more infection-related obstetric morbidity. This hypothesis merits evaluation of a causal association in further research.

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