Abstract
Objective
Assessment of lung development and maturity is of utmost importance in prenatal counseling. Blood oxygen level–dependent (BOLD) effect MRI was developed for functional evaluations of organs. To date, no data are available in fetal lungs and nothing is known about the existence of a BOLD effect in the lungs. The aim of our study was to evaluate if a BOLD response could be detected in fetal lungs.
Materials and methods
From January 2014 to December 2016, 38 healthy pregnant women were prospectively enrolled. After a routine scan on a 1.5-T MRI device (normoxic period), maternal hyperoxia was induced for 5 min before the BOLD sequence (hyperoxic period). R2* was evaluated by fitting average intensity of the signal, both for normoxic (norm) and hyperoxic (hyper) periods.
Results
A significant BOLD response was observed after maternal hyperoxia in the lungs with a mean R2* decrease of 12.1 ± 2.5% (p < 0.001), in line with the placenta response with a mean R2* decrease of 19.2 ± 5.9% (p < 0.0001), confirming appropriate oxygen uptake. Conversely, no significant BOLD effect was observed for the brain nor the liver with a mean ∆R2* of 3.6 ± 3.1% (p = 0.64) and 2.8 ± 3.7% (p = 0.23).
Conclusion
This study shows for the first time in human that a BOLD response can be observed in the normal fetal lung despite its prenatal “non-functional status.” If confirmed in congenital lung and chest malformations, this property could be used in addition to the lung volume for a better prediction of postnatal respiratory status.
Key Points
• Blood oxygen level–dependent (BOLD) effect MRI was developed for functional evaluations of organs and could have interesting implications for the fetal organs.
• Assessment of lung development is of utmost importance in prenatal counseling, but to date no data are available in fetal lungs.
• BOLD response can be observed in the normal fetal lung opening the way to studies on fetus with pathological lungs.
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Abbreviations
- BOLD:
-
Blood oxygen level–dependent
- GA:
-
Gestational age
- LHR:
-
Lung-to-head ratio
- MRI:
-
Magnetic resonance imaging
- ROI:
-
Regions of interest
- SEM:
-
Standard error to the mean
- TE:
-
Echo time effective
- TR:
-
Repetition
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Acknowledgments
Analysis of MRI BOLD data was performed at the Life Imaging Facility of Paris Descartes University (Plateforme Imageries du Vivant), supported by France Life Imaging (grant ANR-11-INBS-0006) and Infrastructures Biologie-Santé.
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The scientific guarantor of this publication is Bertand Tavitian, head of the department.
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The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
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One of the authors has significant statistical expertise (Dr. Afef Bouchouicha).
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Written informed consent was obtained from all subjects (patients) in this study.
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• prospective case- observational
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Khen-Dunlop, N., Chalouhi, G., Lecler, A. et al. Assessment of BOLD response in the fetal lung. Eur Radiol 31, 3090–3097 (2021). https://doi.org/10.1007/s00330-020-07272-z
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DOI: https://doi.org/10.1007/s00330-020-07272-z