Fetal growth restriction and chronic lung disease among infants born before the 28th week of gestation
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Published on: June 29, 2013
Carl Bose1, Linda J Van Marter, Matthew Laughon
1Department of Pediatrics, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA. cbose@med.unc.edu
Insights
Fetal growth restriction (FGR) is a key prenatal predictor of chronic lung disease (CLD) in extremely premature infants. Identifying and managing FGR may reduce the risk of lung injury in these vulnerable newborns.
Area of Science:
- Neonatal Medicine
- Perinatology
- Pediatric Pulmonology
Background:
- Improved survival rates for extremely premature infants have led to a rise in chronic lung disease (CLD).
- Traditional neonatal risk factors for CLD are becoming less common.
- Focus is shifting towards identifying prenatal factors that predict CLD development.
Purpose of the Study:
- To identify current prenatal predictors of chronic lung disease (CLD) in extremely premature infants.
- To investigate the association between fetal growth restriction (FGR) and CLD risk.
- To determine if placental factors predict CLD in this population.
Main Methods:
- Analysis of prenatal, placental, and neonatal data from 1241 infants born before 28 weeks gestation.
- Univariate and multivariate analyses to assess associations between various factors and CLD risk.
- Specific focus on fetal growth restriction (FGR) as a potential predictor.
Main Results:
- Birth weight z scores, indicating FGR, were the strongest prenatal predictors of CLD.
- Placental inflammation or infection did not correlate with increased CLD risk.
- Growth-restricted infants consistently showed higher CLD risk across different strata.
Conclusions:
- Fetal growth restriction (FGR) is an independent risk factor for CLD in premature infants.
- Factors influencing fetal growth may significantly impact lung injury vulnerability.
- Prenatal identification of FGR can aid in managing CLD risk.
Objective:
Improvement in survival of extremely premature infants over the past several decades has resulted in an increase in the number of infants with chronic lung disease (CLD). Historical neonatal exposures associated with CLD now less frequently precede the disease. There is now increasing interest in exposures and events before delivery that predict CLD. The objective of this study was to identify current prenatal predictors of CLD.
Methods:
We collected data about prenatal, placental, and neonatal characteristics of 1241 newborns who were delivered before completion of the 28th week of gestation. Associations between prenatal factors, microbiologic and histologic characteristics of the placenta, and selected neonatal characteristics and CLD risk were first evaluated in univariate analyses. Subsequent multivariate analyses investigated the contribution of prenatal factors, particularly fetal growth restriction (FGR), to CLD risk.
Results:
Among the prenatal factors, birth weight z scores, used as a marker of FGR, provided the most information about CLD risk. Indicators of placental inflammation and infection were not associated with increased risk of CLD. Within nearly all strata of prenatal, placental, and neonatal variables, growth-restricted infants were at increased CLD risk, compared with infants who were not growth-restricted. FGR was the only maternal or prenatal characteristic that was highly predictive of CLD after adjustment for other risk factors.
Conclusions:
FGR is independently associated with the risk of CLD. Thus, factors that control fetal somatic growth may have a significant impact on vulnerability to lung injury and in this way increase CLD risk.
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