Abstract
This study aimed to investigate factors affecting N-terminal pro-B-type natriuretic peptide (NTproBNP) in preterm infants and the ability of NTproBNP to predict haemodynamically significant patent ductus arteriosus (HsPDA). Prospective cohort study of 51 infants < 30 weeks gestation. Blood NTproBNP and heart ultrasound were performed on day of life 3, 10, 28 and 36 weeks corrected age. NTproBNP levels analysed for prediction of HsPDA. The effect of gestational age, ventilation, hypoxia, bronchopulmonary dysplasia (BPD), creatinine and haemoglobin levels on NTproBNP levels were investigated. Infants with HsPDA had higher mean (SD) day 3 NTproBNP (1840 pmol/L (1058) versus 178 pmol/L (140) p < 0.001). Receiver operator curves of day 3 NTproBNP for prediction of day 3 and day 10 HsPDA had an area under the curve of 0.98 and 0.94, respectively. A chosen day 3 NTproBNP value of ≥ 287 pmol/L for the prediction of day 3 HsPDA correctly classified 92% (sensitivity 92%, specificity 92%). NTproBNP demonstrated only modest ability to predict severe BPD. Chronological but not gestational age affected NTproBNP. Ventilation, hypoxia and haemoglobin levels did not influence NTproBNP but creatinine level was positively correlated.
Conclusion: Day 3 NTproBNP is a useful biomarker to predict HsPDA and may be a valuable tool in future trial design.
What is Known: |
• NTproBNP is a cardiac hormone used to diagnose and monitor cardiac dysfunction in adults and has been shown to be higher in premature infants with haemodynamically significant ductus arteriosus (HsPDA). |
What is new: |
• NTproBNP is highly predictive of ultrasound-defined HsPDA and may be a useful tool for further triage |
• Early NTproBNP higher in infants who develop severe BPD and with renal impairment but not affected by gestational age, recent exposure to hypoxia or haemoglobin levels while late levels unexpectedly higher in those without BPD or HsPDA. |
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Abbreviations
- BPD:
-
Bronchopulmonary dysplasia
- BNP:
-
B-type natriuretic peptide
- Hb:
-
Haemoglobin
- HsPDA:
-
Haemodynamically significant PDA
- GA:
-
Gestational age
- IQR:
-
Interquartile range
- NICHD:
-
National Institute Child Health and Human Development
- NTproBNP:
-
N-terminal pro-B-type natriuretic peptide
- PDA:
-
Patent ductus arteriosus
- ROC:
-
Receiver operating characteristic
- SD:
-
Standard deviation
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Acknowledgements
We thank BOPP Study infants and families and Neonatal research nurse Trish Graham for data entry support
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Authors and Affiliations
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Sarah Harris is a neonatologist who was responsible for study concept, trial design, consent and communication with study families, data collection including performing the majority of the heart ultrasounds, analysis and preparation of the manuscript.
Kiran More is a neonatologist performed some heart ultrasounds, classification of PDA significance and was involved in preparation of manuscript.
Bronwyn Dixon is a neonatologist who performed some heart ultrasounds and was involved in editing manuscript.
Richard Troughton is an adult cardiologist who offered cardiology advice and supervision in heart ultrasound protocol development and interpretation of NTproBNP and heart ultrasound results and was involved in editing manuscript.
Chris Pemberton is a research scientist who was responsible for advising on the laboratory testing and the processing of NTproBNP testing and advised on interpretation of these results.
John Horwood was the statistician who provided statistical advice and analysis.
Nicola Ellis is a research nurse who was involved in data entry and manuscript preparation.
Nicola Austin is a neonatologist who was responsible for senior oversight for the study and was involved in manuscript preparation.
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Disclosure of potential conflicts of interest and funding
Dr. Harris received salary for this study from the Freemasons of New Zealand administered by the University of Otago as a Child Health Fellowship.
Assoc Prof Austin received a grant from the Maurice and Phyllis Paykel Trust to fund the NTproBNP testing.
There are no conflicts of interest to declare.
Research involving human participants and/or animals
Ethical approval: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The University of Otago Human Ethics Committee approved this study (12/298).
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Informed consent was obtained from all individual participants (parental consent as subjects are children) included in the study.
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Communicated by Patrick Van Reempts
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Harris, S.L., More, K., Dixon, B. et al. Factors affecting N-terminal pro-B-type natriuretic peptide levels in preterm infants and use in determination of haemodynamic significance of patent ductus arteriosus. Eur J Pediatr 177, 521–532 (2018). https://doi.org/10.1007/s00431-018-3089-y
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DOI: https://doi.org/10.1007/s00431-018-3089-y