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Evaluation of Long-term Outcomes Associated With Preterm Exposure to Antenatal Corticosteroids: A Systematic Review
Kiran Ninan1,2, Sugee K Liyanage1, Kellie E Murphy3
1Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario, Canada.
Insights
Antenatal corticosteroids reduced neurodevelopmental impairment in extremely preterm infants but increased risks for neurocognitive and behavioral issues in late-preterm and full-term children. Caution is advised for antenatal corticosteroid use.
Area of Science:
- Obstetrics and Gynecology
- Neonatology
- Developmental Pediatrics
Background:
- Antenatal corticosteroids are used to mature fetal lungs but long-term effects on children are not fully understood.
- Animal studies suggest broad organ system impacts, necessitating human outcome evaluation.
Purpose of the Study:
- To systematically review and meta-analyze long-term outcomes of antenatal corticosteroid exposure in children.
- To compare outcomes in extremely preterm, late-preterm, and full-term infants.
Main Methods:
- Systematic review and meta-analysis of RCTs, quasi-RCTs, and cohort studies (2000-2021).
- Searched multiple databases including MEDLINE, Embase, PsycInfo, CINAHL, Web of Science, ClinicalTrials.gov, and Google Scholar.
- Extracted data on neurodevelopmental, psychological, anthropometric, metabolic, and cardiorespiratory outcomes at ≥1 year.
Main Results:
- 30 studies involving >1.25 million children were included.
- Antenatal corticosteroids reduced neurodevelopmental impairment in extremely preterm infants (aOR 0.69).
- Increased risk of neurocognitive/behavioral disorders in late-preterm (aHR 1.12) and full-term infants (aHR 1.47).
Conclusions:
- Single-course antenatal corticosteroids benefit extremely preterm infants but pose risks for late-preterm and full-term infants.
- Findings indicate a need for cautious administration of antenatal corticosteroids.
- Further research into risk-benefit profiles across gestational ages is warranted.
Importance:
Animal studies have found that antenatal corticosteroids affect many organs across multiple stages of life. However, the long-term outcomes in human children are not well understood.
Objective:
To conduct a systematic review and meta-analysis of long-term outcomes associated with preterm exposure to antenatal corticosteroids compared with no exposure in all children as well as children with preterm and full-term birth.
Data Sources:
Academic databases were searched for articles published from January 1, 2000, to October 29, 2021, including Ovid MEDLINE, Ovid Embase, PsycInfo, CINAHL (Cumulative Index of Nursing and Allied Health Literature), Web of Science, ClinicalTrials.gov, and Google Scholar. References of articles were also searched for relevant studies.
Study Selection:
Randomized clinical trials (RCTs), quasi-RCTs, and cohort studies that assessed long-term neurodevelopmental, psychological, or other outcomes at 1 year or older in those who had preterm exposure to antenatal corticosteroids were included. No language restrictions were set.
Data Extraction And Synthesis:
Two reviewers independently extracted data using a piloted data extraction form. Data on study population, pregnancy characteristics, exposure to antenatal corticosteroids, and outcomes were collected. Preferred Reporting Items for Systematic Reviews and Meta-analyses reporting guidelines were followed, and random-effects models were used for the meta-analysis.
Main Outcomes And Measures:
The primary outcome was an author-defined composite of any adverse neurodevelopmental and/or psychological disorder. The secondary outcomes included specific measures of psychological disorders; neurodevelopmental delay; and anthropometric, metabolic, and cardiorespiratory outcomes.
Results:
A total of 30 studies met the inclusion criteria, and involved more than 1.25 million children who were at least 1 year of age when the outcomes were assessed. Exposure to a single course of antenatal corticosteroids for children with extremely preterm birth was associated with a significant reduction in risk of neurodevelopmental impairment (adjusted odds ratio, 0.69 [95% CI, 0.57-0.84]; I2 = 0%; low certainty). For children with late-preterm birth, exposure to antenatal corticosteroids was associated with a higher risk of investigation for neurocognitive disorders (n = 25 668 children; adjusted hazard ratio [aHR], 1.12 [95% CI, 1.05-1.20]; low certainty). For children with full-term birth, exposure to antenatal corticosteroids was associated with a higher risk of mental or behavioral disorders (n = 641 487 children; aHR, 1.47 [95% CI, 1.36-1.60]; low certainty) as well as proven or suspected neurocognitive disorders (n = 529 205 children; aHR, 1.16 [95% CI, 1.10-1.21]; low certainty).
Conclusions And Relevance:
Results of this study showed that exposure to a single course of antenatal corticosteroids was associated with a significantly lower risk of neurodevelopmental impairment in children with extremely preterm birth but a significantly higher risk of adverse neurocognitive and/or psychological outcomes in children with late-preterm and full-term birth, who made up approximately half of those with exposure to antenatal corticosteroids. The findings suggest a need for caution in administering antenatal corticosteroids.
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