Brain natriuretic peptide and N-terminal brain natriuretic peptide for the diagnosis of haemodynamically significant patent ductus arteriosus in preterm neonates

Utility of urinary NT-proBNP in congenital diaphragmatic hernia: a prospective pilot study

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

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.

NT-PROBNP as a screening tool for low-risk patent ductus arteriousus: a follow-up validation study

The purpose of the study is to test whether NT-proBNP serves as a screening tool for low-risk patent ductus arteriosus and safely avoids routine early echocardiography. This is a prospective observational study in preterm infants ≤32 weeks of gestational age. Infants with ≥5100 pg/ml (positive screening) at 48-72 hours of life received comprehensive echocardiography and were treated according to shunt severity. Infants with NT-proBNP below 5100 pg/ml (negative screening) were managed expectantly. The main outcome was need for ductus treatment within the first 7 days of life. One hundred twenty-five infants were included; 82 had a negative NT-proBNP screening and 43 had a positive NT-proBNP screening. No infant (0%) with a negative screening was treated for ductus while 26 (60.4%) with a positive screening were treated (p < 0.001). NT-proBNP avoided a 65.6% of routine echocardiograms. NT-proBNP had an excellent performance to predict PDA treatment (AUC = 0.967).Conclusion: NT-proBNP at 48-72 hours of life has an excellent performance to detect low risk and avoids unnecessary echocardiograms. This may contribute to optimize PDA management in terms of resource utilization.

Diagnostic Accuracy of Urinary N Terminal pro-B Type Natriuretic Peptides for Hemodynamically Significant-Patent Ductus Arteriosus in Preterm Infants

BACKGROUND

Echocardiography is the gold standard for the diagnosis hemodynamically significant-patent ductus arteriosus (hs-PDA). It requires trained personnel and is not readily available. Urinary biomarkers can be used as an adjunct.

OBJECTIVE

The objective of this study was to systematically review the diagnostic accuracy of urinary N terminal pro-B type natriuretic peptides (NT-proBNP) for hs-PDA in preterm neonates.

METHODS

We included studies that evaluated urinary NT-proBNP and urinary NT-proBNP/creatinine ratio (index tests) in preterm neonates with hs-PDA (participants) in comparison with echocardiogram (reference standard). Methodological quality and certainty of evidence were assessed using Quality Assessment of Diagnostic-Accuracy Studies (QUADAS-2) and Grading of Recommendations Assessment, Development and Evaluation (GRADE), respectively.

RESULTS

Low quality of evidence suggests that urinary NT-proBNP has modest sensitivity and specificity for the diagnosis of a hs-PDA, with variation in accuracy based on assay and patient characteristics.

CONCLUSION

Urinary NT-proBNP assays must be locally validated for specific patient populations and further studies to support its use must be performed.