Consequences and implications of the coronavirus disease (COVID-19) on pregnancy and newborns: A comprehensive systematic review and meta-analysis.

Background: Pregnant patients are potentially vulnerable to COVID-19.

Objectives: To clarify the clinical features of COVID-19 and analyze maternal/fetal morbidity and mortality and the obstetric and neonatal outcomes of pregnant patients.

Search Strategy: Embase, PubMed, Web of Science, CINAHAL, LILACS, Google Scholar, and Scopus.

Selection Criteria: Articles published from December 2019 to February 2021.

Data Collection And Analysis: The reviewers extracted relevant data from the full-text. Data synthesis was performed using the R-4.1.0 Project for Statistical Computing for Windows. The meta-analysis of the included studies was carried out using the random-effects model (DerSimonian and Laird). Heterogeneity was measured using I analysis.

Results: A total of 70 studies included 10 047 pregnant women with COVID-19, of whom 71.6% were in their third trimester. The most common symptoms were fever, cough, chest pain, dyspnea, and fatigue. Most newborns were delivered preterm (24%, 95% confidence interval [CI] 0.17-0.34, I  = 93%) and via cesarean delivery (42%, 95% CI 0.38-0.47, I  = 92%). There were 108 maternal mortalities (2%, 95% CI 0.01-0.03, I  = 54%) and 50 abortions (5%, 95% CI 0.03-0.09, I  = 73%). The neonatal outcomes included fetal distress (11%, 95% CI 0.06-0.19, I  = 91%), birth weight (15%, 95% CI 0.10-0.21, I  = 76%), APGAR <7 (19%, 95% CI 0.12-0.28, I  = 43%), admission to the neonatal intensive care unit (28%, 95% CI 0.17-0.43, I  = 90%), and fetal mortality (2%, 95% CI 0.01-0.03, I  = 46%).

Conclusion:  There was no evidence of severe acute respiratory syndrome coronavirus-2 in the placenta, breast milk, umbilical cord, and amniotic fluid of pregnant patients. PROSPERO registration number: CRD42020181519.