Abstract
Background
Echocardiography is the reference standard for diagnosing pulmonary hypertension (PH) and cardiac dysfunction (CD) in congenital diaphragmatic hernia (CDH). The use of an adjunct non-invasive biomarker would be invaluable. Plasma N-terminal brain Natriuretic Peptide (NT-proBNP) has been evaluated as a biomarker in CDH. Our objective was to investigate the utility of urinary NT-proBNP as an adjunct biomarker in CDH.
Methods
Prospective observational study of neonates with CDH. Urinary NT-proBNP and its ratio to urinary creatinine (UNBCR) were analyzed at 24 h of life (HOL). Spearman’s correlation was used to quantify the association between the urinary NT-proBNP with corresponding plasma concentrations. Logistic regression and receiver operating characteristic (ROC) curve analyses were used to examine urinary NT-proBNP and UNBCR’s association with need for ECMO. The Kruskal–Wallis test was used to compare urinary NT-proBNP concentrations with echocardiography parameters of PH and CD.
Results
Urinary NT-proBNP and UNBCR positively correlated with plasma concentrations. Patients with high right ventricular (RV) pressures had higher urinary NT-proBNP concentrations. Both urinary NT-proBNP and UNBCR concentrations increased with worsening left and right ventricular dysfunction on first postnatal echocardiogram.
Conclusion
We report the feasibility of urinary NT-proBNP as a non-invasive biomarker to assess PH and CD in CDH.
Impact statement
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Non-invasive biomarkers are an important area of research in neonates as they have the potential to decrease the need for blood sampling, which may cause pain, stress, and induce iatrogenic anemia. Use of non-invasive biomarkers could be especially useful in congenital diaphragmatic hernia (CDH) who may need Extra-Corporeal Life Support (ECLS) for their management. We evaluated the potential utility of the urinary NT-proBNP in CDH. Plasma NT-proBNP has been studied in neonates with CDH; however, urinary NT-proBNP has not been explored, making this the first study to examine its potential as a biomarker.
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Data availability
All data generated or analyzed during this study are included in this manuscript.
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Acknowledgements
We acknowledge the time, effort, and dedication of the Newborn Center Nursing staff in helping with timely sample collection and storage of patient samples for this project. This study was funded by the Evie Whitlock Funding for Fellows in Neonatal-Perinatal Medicine at Baylor College of Medicine.
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Srirupa Hari Gopal- Conceptualization, methodology, investigation, writing original draft, editing draft, funding acquisition, visualization; Kelly Frances Martinek-Investigation, data curation, review original draft; Judith Becker-Investigation, resources, review original draft; Nidhy Varghese- Resources, review original draft; Betul Yilmaz- Resources, review original draft; Joseph Hagan- Data curation, formal analysis, review original draft; Sharada H. Gowda- Resources, review original draft; Mohan Pammi- Methodology, Resources, review original draft; Sridevi Devaraj- Methodology, Resources, review original draft; Caraciolo J. Fernandes- Conceptualization, methodology, resources, supervision, and review of the final manuscript.
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Hari Gopal, S., Martinek, K.F., Vacher, C. et al. Utility of urinary NT-proBNP in congenital diaphragmatic hernia: a prospective pilot study. Pediatr Res 97, 2305–2311 (2025). https://doi.org/10.1038/s41390-024-03600-x
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DOI: https://doi.org/10.1038/s41390-024-03600-x
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