Pregnant women, or women considering pregnancy, want to know—is pregnancy safe in the midst of the coronavirus disease 2019 (COVID-19) pandemic? In this article, I tackle common questions facing reproductive-aged or pregnant women and their providers.
1. What are the risks of COVID-19 in pregnancy?
A large, national prospective cohort study of outpatient pregnant and recently postpartum women with the diagnosis of suspected or confirmed COVID-19 demonstrated that many affected women have mild illnesses, with typical symptoms including cough, sore throat, body aches, fever, and headache.1 Although symptoms were most common within the first 3 weeks of presentation, approximately 25% of women had a protracted course of symptoms (8 or more weeks). As this cohort disproportionately enrolled outpatients, it is important to note that many women had mild illnesses, which is the most likely course of infection in otherwise healthy, young women.
Data on the impact of COVID-19 on rates of miscarriage and birth defects are limited, yet the published reports are reassuring, with no increased risks of miscarriage, and no clear signal for birth defects.2
In a prospective cohort study across 3 New York City institutions when universal severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) testing was recommended upon admission for delivery, approximately 80% of women who were positive were asymptomatic.3 Maternal outcomes generally were reassuring, with no patients experiencing severe or critical illness. There were no differences in preterm delivery rates by SARS-CoV-2 status, but the rate of cesarean delivery was higher among women with COVID-19, for unclear reasons. Most notably, the rate of postpartum complications was 13% among women with COVID-19, versus 2.5% among women without COVID-19. These complications included readmission for worsening COVID-19, postpartum hypoxia, and postpartum fever.
A recent prospective cohort study from 1 institution in Texas similarly demonstrated favorable maternal outcomes with COVID-19, with 95% of women with asymptomatic or mild illness, and no differences in adverse pregnancy outcomes between COVID-19–positive and COVID-19–negative women, including cesarean delivery rate.4
Finally, certain characteristics increase the risk of COVID-19 among pregnant women and nonpregnant individuals alike. In a nationwide prospective cohort from the United Kingdom, medical comorbidities including obesity, diabetes (gestational or pregestational), hypertension, as well as Black or other minority ethnicities are associated with COVID-19.5 This is particularly notable given universal health insurance in the United Kingdom. Other data have also confirmed that women with comorbidities, women of Black or Hispanic ethnicity, and women with lower socioeconomic status, are at increased risk of COVID-19.3,6,7
2. Is COVID-19 worse in pregnancy?
Given the well-documented risks of COVID-19 outside of pregnancy, is COVID-19 worse in a pregnant woman than in a nonpregnant woman? The most recent guidance from the Centers for Disease Control and Prevention (CDC) from November 2020 suggests that pregnant women are at increased risk for severe illness.8 However, it is important to understand the design of this study in order to appreciate its implications. Laboratory confirmed SARS-CoV-2 in the United States is systematically reported to the CDC. Among women aged 15–44 years with such confirmation, data on pregnancy status were available for 35.5%, almost 90% of whom were symptomatic. Within this cohort of largely symptomatic pregnant women, risks of intensive care unit (ICU) admission, invasive ventilation, and use of extracorporeal membrane oxygenation (ECMO) were approximately 2 to 3 times higher for pregnant women than for nonpregnant women. The absolute risks, however, were low. The risk of ICU admission for symptomatic pregnant women was approximately 1%; the risk of invasive ventilation, 0.3%; and the risk of ECMO, 0.1%.
Moreover, the lack of uniform data capture on pregnancy status for all women ages 15–44 years may skew the population with known pregnancy status to be sicker and, thus, may bias the results toward increased risks. Nevertheless, there is consistency in several publications with different data sources, all of which suggest pregnancy is an independent risk factor for increased severity of COVID-19.9-11 Additionally, women with medical comorbidities (such as pregestational or gestational diabetes or obesity) are more likely to have severe COVID-19.
Continue to: 3. What are newborn outcomes if COVID-19 is diagnosed during pregnancy?...