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Gao L, Yang P, Luo C, Lei M, Shi Z, Cheng X, Zhang J, Cao W, Ren M, Zhang L, Wang B, Zhang Q. Machine learning predictive models for grading bronchopulmonary dysplasia: umbilical cord blood IL-6 as a biomarker. Front Pediatr 2023; 11:1301376. [PMID: 38161441 PMCID: PMC10757373 DOI: 10.3389/fped.2023.1301376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 11/27/2023] [Indexed: 01/03/2024] Open
Abstract
Objectives This study aimed to analyze the predictive value of umbilical cord blood Interleukin-6 (UCB IL-6) for the severity-graded BPD and to establish machine learning (ML) predictive models in a Chinese population based on the 2019 NRN evidence-based guidelines. Methods In this retrospective analysis, we included infants born with gestational age <32 weeks, who underwent UCB IL-6 testing within 24 h of admission to our NICU between 2020 and 2022. We collected their medical information encompassing the maternal, perinatal, and early neonatal phases. Furthermore, we classified the grade of BPD according to the 2019 NRN evidence-based guidelines. The correlation between UCB IL-6 and the grades of BPD was analyzed. Univariate analysis and ordinal logistic regression were employed to identify risk factors, followed by the development of ML predictive models based on XGBoost, CatBoost, LightGBM, and Random Forest. The AUROC was used to evaluate the diagnostic value of each model. Besides, we generated feature importance distribution plots based on SHAP values to emphasize the significance of UCB IL-6 in the models. Results The study ultimately enrolled 414 preterm infants, with No BPD group (n = 309), Grade 1 BPD group (n = 73), and Grade 2-3 BPD group (n = 32). The levels of UCB IL-6 increased with the grades of BPD. UCB IL-6 demonstrated clinical significance in predicting various grades of BPD, particularly in distinguishing Grade 2-3 BPD patients, with an AUROC of 0.815 (95% CI: 0.753-0.877). All four ML models, XGBoost, CatBoost, LightGBM, and Random Forest, exhibited Micro-average AUROC values of 0.841, 0.870, 0.851, and 0.878, respectively. Notably, UCB IL-6 consistently appeared as the most prominent feature across the feature importance distribution plots in all four models. Conclusion UCB IL-6 significantly contributes to predicting severity-graded BPD, especially in grade 2-3 BPD. Through the development of four ML predictive models, we highlighted UCB IL-6's importance.
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Affiliation(s)
- Linan Gao
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
| | - Pengkun Yang
- Computer Science and Technology, University of Science and Technology of China, Hefei, China
| | - Chenghan Luo
- Department of Orthopaedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Mengyuan Lei
- Health Care Department, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Zanyang Shi
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
| | - Xinru Cheng
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
| | - Jingdi Zhang
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
| | - Wenjun Cao
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
| | - Miaomiao Ren
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
| | - Luwen Zhang
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
| | - Bingyu Wang
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
| | - Qian Zhang
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Clinical Treatment and Follow-Up Center for High-Risk Newborns of Henan Province, Zhengzhou, China
- Key Laboratory for Prevention and Control of Developmental Disorders, Zhengzhou, China
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Häfner F, Kindt A, Strobl K, Förster K, Heydarian M, Gonzalez E, Schubert B, Kraus Y, Dalla Pozza R, Flemmer AW, Ertl-Wagner B, Dietrich O, Stoecklein S, Tello K, Hilgendorff A. MRI pulmonary artery flow detects lung vascular pathology in preterms with lung disease. Eur Respir J 2023; 62:2202445. [PMID: 37678954 PMCID: PMC10749508 DOI: 10.1183/13993003.02445-2022] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 07/24/2023] [Indexed: 09/09/2023]
Abstract
BACKGROUND Pulmonary vascular disease (PVD) affects the majority of preterm neonates with bronchopulmonary dysplasia (BPD) and significantly determines long-term mortality through undetected progression into pulmonary hypertension. Our objectives were to associate characteristics of pulmonary artery (PA) flow and cardiac function with BPD-associated PVD near term using advanced magnetic resonance imaging (MRI) for improved risk stratification. METHODS Preterms <32 weeks postmenstrual age (PMA) with/without BPD were clinically monitored including standard echocardiography and prospectively enrolled for 3 T MRI in spontaneous sleep near term (AIRR (Attention to Infants at Respiratory Risks) study). Semi-manual PA flow quantification (phase-contrast MRI; no BPD n=28, mild BPD n=35 and moderate/severe BPD n=25) was complemented by cardiac function assessment (cine MRI). RESULTS We identified abnormalities in PA flow and cardiac function, i.e. increased net forward volume right/left ratio, decreased mean relative area change and pathological right end-diastolic volume, to sensitively detect BPD-associated PVD while correcting for PMA (leave-one-out area under the curve 0.88, sensitivity 0.80 and specificity 0.81). We linked these changes to increased right ventricular (RV) afterload (RV-arterial coupling (p=0.02), PA mid-systolic notching (t2; p=0.015) and cardiac index (p=1.67×10-8)) and correlated echocardiographic findings. Identified in moderate/severe BPD, we successfully applied the PA flow model in heterogeneous mild BPD cases, demonstrating strong correlation of PVD probability with indicators of BPD severity, i.e. duration of mechanical ventilation (rs=0.63, p=2.20×10-4) and oxygen supplementation (rs=0.60, p=6.00×10-4). CONCLUSIONS Abnormalities in MRI PA flow and cardiac function exhibit significant, synergistic potential to detect BPD-associated PVD, advancing the possibilities of risk-adapted monitoring.
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Affiliation(s)
- Friederike Häfner
- Institute for Lung Health and Immunity and Comprehensive Pneumology Center with the CPC-M bioArchive, Helmholtz Center Munich, Member of the German Center for Lung Research (DZL), Munich, Germany
- Center for Comprehensive Developmental Care (CDeCLMU) at the interdisciplinary Social Pediatric Center (iSPZ Hauner), Haunersches Children's Hospital, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
- F. Häfner and A. Kindt contributed equally to this study
| | - Alida Kindt
- Metabolomics and Analytics Centre, Leiden Academic Centre for Drug Research (LACDR), Leiden University, Leiden, The Netherlands
- F. Häfner and A. Kindt contributed equally to this study
| | - Kathrin Strobl
- Center for Comprehensive Developmental Care (CDeCLMU) at the interdisciplinary Social Pediatric Center (iSPZ Hauner), Haunersches Children's Hospital, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
| | - Kai Förster
- Center for Comprehensive Developmental Care (CDeCLMU) at the interdisciplinary Social Pediatric Center (iSPZ Hauner), Haunersches Children's Hospital, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
- Division of Neonatology, University Children's Hospital Dr v. Hauner and Perinatal Center, University Hospital, Ludwig Maximilian University Munich, Munich Germany
| | - Motaharehsadat Heydarian
- Institute for Lung Health and Immunity and Comprehensive Pneumology Center with the CPC-M bioArchive, Helmholtz Center Munich, Member of the German Center for Lung Research (DZL), Munich, Germany
| | - Erika Gonzalez
- Institute for Lung Health and Immunity and Comprehensive Pneumology Center with the CPC-M bioArchive, Helmholtz Center Munich, Member of the German Center for Lung Research (DZL), Munich, Germany
- Center for Comprehensive Developmental Care (CDeCLMU) at the interdisciplinary Social Pediatric Center (iSPZ Hauner), Haunersches Children's Hospital, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
| | - Benjamin Schubert
- Institute of Computational Biology, Helmholtz Center Munich, Munich, Germany
| | - Yvonne Kraus
- Center for Comprehensive Developmental Care (CDeCLMU) at the interdisciplinary Social Pediatric Center (iSPZ Hauner), Haunersches Children's Hospital, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
| | - Robert Dalla Pozza
- Department of Pediatric Cardiology, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
| | - Andreas W Flemmer
- Division of Neonatology, University Children's Hospital Dr v. Hauner and Perinatal Center, University Hospital, Ludwig Maximilian University Munich, Munich Germany
| | - Birgit Ertl-Wagner
- Department of Diagnostic Imaging, Hospital for Sick Children, Toronto, ON, Canada
| | - Olaf Dietrich
- Department of Radiology, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
| | - Sophia Stoecklein
- Department of Radiology, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
| | - Khodr Tello
- Department of Internal Medicine, Justus Liebig University Giessen, Universities of Giessen and Marburg Lung Center (UGMLC), Member of the German Center for Lung Research (DZL), Giessen, Germany
| | - Anne Hilgendorff
- Institute for Lung Health and Immunity and Comprehensive Pneumology Center with the CPC-M bioArchive, Helmholtz Center Munich, Member of the German Center for Lung Research (DZL), Munich, Germany
- Center for Comprehensive Developmental Care (CDeCLMU) at the interdisciplinary Social Pediatric Center (iSPZ Hauner), Haunersches Children's Hospital, University Hospital, Ludwig Maximilian University Munich, Munich, Germany
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Häfner F, Johansson C, Schwarzkopf L, Förster K, Kraus Y, Flemmer AW, Hansmann G, Sallmon H, Felderhoff‐Müser U, Witt S, Schwettmann L, Hilgendorff A. Current diagnosis and treatment practice for pulmonary hypertension in bronchopulmonary dysplasia-A survey study in Germany (PUsH BPD). Pulm Circ 2023; 13:e12320. [PMID: 38144949 PMCID: PMC10739109 DOI: 10.1002/pul2.12320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Accepted: 11/25/2023] [Indexed: 12/26/2023] Open
Abstract
Pulmonary hypertension (PH) is the most severe complication in preterm infants with bronchopulmonary dysplasia (BPD) and associated with significant mortality. Diagnostic and treatment strategies, however, still lack standardization. By the use of a survey study (PH in BPD), we assessed clinical practice (diagnosis, treatment, follow-up) in preterm infants with early postnatal persistent pulmonary hypertension of the newborn (PPHN) as well as at risk for or with established BPD-associated PH between 06/2018 and 10/2020 in two-thirds of all German perinatal centers with >70 very low birthweight infants/year including their cardiology departments and outpatient units. Data were analyzed descriptively by measures of locations and distributional shares. In routine postnatal care, clinical presentation and echocardiography were reported as the main diagnostic modalities to screen for PPHN in preterm infants, whereas biomarkers brain natriuretic peptide/N-terminal pro b-type natriuretic peptide were infrequently used. For PPHN treatment, inhaled nitric oxide was used in varying frequency. The majority of participants agreed to prescribe diuretics and steroids (systemic/inhaled) for infants at risk for or with established BPD-associated PH and strongly agreed on recommending respiratory syncytial virus immunization and the use of home monitoring upon discharge. Reported oxygen saturation targets, however, varied in these patients in in- and outpatient care. The survey reveals shared practices in diagnostic and therapeutic strategies for preterms with PPHN and BPD-associated PH in Germany. Future studies are needed to agree on detailed echo parameters and biomarkers to diagnose and monitor disease next to a much-needed agreement on the use of pulmonary vasodilators, steroids, and diuretics as well as target oxygen saturation levels.
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Affiliation(s)
- Friederike Häfner
- Institute for Lung Health and Immunity and Comprehensive Pneumology CenterHelmholtz Munich, Member of the German Center for Lung Research (DZL)MunichGermany
- Center for Comprehensive Developmental Care (CDeCLMU) at the Interdisciplinary Social Pediatric CenterDr. von Hauner Children's Hospital, LMU University HospitalMunichGermany
| | - Caroline Johansson
- Center for Comprehensive Developmental Care (CDeCLMU) at the Interdisciplinary Social Pediatric CenterDr. von Hauner Children's Hospital, LMU University HospitalMunichGermany
| | - Larissa Schwarzkopf
- Institute of Health Economics and Health Care ManagementHelmholtz MunichNeuherbergGermany
- IFT Institute für TherapieforschungCentre for Mental Health and Addiction ResearchMunichGermany
| | - Kai Förster
- Center for Comprehensive Developmental Care (CDeCLMU) at the Interdisciplinary Social Pediatric CenterDr. von Hauner Children's Hospital, LMU University HospitalMunichGermany
- Division of NeonatologyDr. von Hauner Children's Hospital, LMU University HospitalMunichGermany
| | - Yvonne Kraus
- Center for Comprehensive Developmental Care (CDeCLMU) at the Interdisciplinary Social Pediatric CenterDr. von Hauner Children's Hospital, LMU University HospitalMunichGermany
| | - Andreas W. Flemmer
- Division of NeonatologyDr. von Hauner Children's Hospital, LMU University HospitalMunichGermany
| | - Georg Hansmann
- Department of Pediatric Cardiology and Critical CareHannover Medical SchoolHannoverGermany
| | - Hannes Sallmon
- Department of Congenital Heart Disease/Pediatric CardiologyDeutsches Herzzentrum der Charité (DHZC)BerlinGermany
- Division of Pediatric CardiologyMedical University of GrazGrazAustria
| | - Ursula Felderhoff‐Müser
- Department of Pediatrics I, Neonatology, Pediatric Intensive Care, and Pediatric Neurology, University Hospital EssenUniversity of Duisburg‐EssenEssenGermany
| | - Sabine Witt
- Institute of Health Economics and Health Care ManagementHelmholtz MunichNeuherbergGermany
| | - Lars Schwettmann
- Institute of Health Economics and Health Care ManagementHelmholtz MunichNeuherbergGermany
- Department of Health Services Research, Faculty VI Medicine and Health SciencesCarl von Ossietzky University of OldenburgOldenburgGermany
| | - Anne Hilgendorff
- Institute for Lung Health and Immunity and Comprehensive Pneumology CenterHelmholtz Munich, Member of the German Center for Lung Research (DZL)MunichGermany
- Division of NeonatologyDr. von Hauner Children's Hospital, LMU University HospitalMunichGermany
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Rodolaki K, Pergialiotis V, Sapantzoglou I, Theodora M, Antsaklis P, Pappa K, Daskalakis G, Papapanagiotou A. N-Terminal Pro-B Type Natriuretic Peptide as a Predictive Biomarker of Bronchopulmonary Dysplasia or Death Due to Bronchopulmonary Dysplasia in Preterm Neonates: A Systematic Review and Meta-Analysis. J Pers Med 2023; 13:1287. [PMID: 37763055 PMCID: PMC10532602 DOI: 10.3390/jpm13091287] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 08/13/2023] [Accepted: 08/17/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND Emerging evidence suggests the clinical utility of N terminal pro B type natriuretic peptide (NT-proBNP) in multiple cardiac and pulmonary abnormalities both in adult and pediatric populations. To date, however, there is no consensus regarding its efficacy for the prediction and severity of bronchopulmonary dysplasia in premature neonates. The objective of the present meta-analysis was to determine differences in NT-proBNP among neonates that develop BPD or die from BPD and to evaluate if there is relative information on the diagnostic accuracy of the method. METHODS We conducted a systematic search according to the PRISMA guidelines and looked into Medline (1966-2023), Scopus (2004-2023), Clinicaltrials.gov (2008-2023), EMBASE (1980-2023), Cochrane Central Register of Controlled Trials CENTRAL (1999-2022) and Google Scholar (2004-2023) together with the reference lists from included studies. The potential risk of bias encountered in our study was evaluated using the QUADAS -2 tool. Finally, a total of 9 studies met the eligibility criteria, comprising 1319 newborns, from which 397 developed BPD and 922 were unaffected controls. RESULTS The results retrieved from our meta-analysis showed that newborns suffering from BPD had notably elevated NT-proBNP levels after birth when compared with healthy neonates (SMD 2.57, 95% CI 0.41, 4.72). The summary effect of the AUC meta-analysis showed that NT-proBNP was very accurate in detecting neonates at risk of developing severe BPD or dying from the disease (AUC -0.16, 95% CI -0.23, -0.08). No studies reported data relevant to the sensitivity and/or specificity of the method in diagnosing BPD. CONCLUSION Serum NT-proBNP levels represent a potential future biomarker with great diagnostic validity for the prediction of BPD complicating preterm deliveries. The limited amount of studies included and the significant variations in cutoff values and timing of measurement still restrict the application of NT-proBNP as an established clinical biomarker for BPD. The design of larger prospective studies will provide a more representative number of participants and will address the discrepancies in existing literature.
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Affiliation(s)
- Kalliopi Rodolaki
- 1st Department of Pediatrics, National and Kapodistrian University of Athens, Aghia Sophia Children’s Hospital, 11527 Athens, Greece;
| | - Vasilios Pergialiotis
- 1st Department of Obstetrics and Gynecology, Alexandra Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece; (V.P.); (I.S.); (M.T.); (P.A.); (K.P.); (G.D.)
| | - Ioakeim Sapantzoglou
- 1st Department of Obstetrics and Gynecology, Alexandra Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece; (V.P.); (I.S.); (M.T.); (P.A.); (K.P.); (G.D.)
| | - Marianna Theodora
- 1st Department of Obstetrics and Gynecology, Alexandra Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece; (V.P.); (I.S.); (M.T.); (P.A.); (K.P.); (G.D.)
| | - Panagiotis Antsaklis
- 1st Department of Obstetrics and Gynecology, Alexandra Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece; (V.P.); (I.S.); (M.T.); (P.A.); (K.P.); (G.D.)
| | - Kalliopi Pappa
- 1st Department of Obstetrics and Gynecology, Alexandra Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece; (V.P.); (I.S.); (M.T.); (P.A.); (K.P.); (G.D.)
| | - Georgios Daskalakis
- 1st Department of Obstetrics and Gynecology, Alexandra Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece; (V.P.); (I.S.); (M.T.); (P.A.); (K.P.); (G.D.)
| | - Aggeliki Papapanagiotou
- Department of Biological Chemistry, School of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece
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Fritz AS, Keller T, Kribs A, Hünseler C. Diseases associated with prematurity in correlation with N-terminal pro-brain natriuretic peptide levels during the early postnatal life. Eur J Pediatr 2023:10.1007/s00431-023-04973-7. [PMID: 37072630 DOI: 10.1007/s00431-023-04973-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 03/22/2023] [Accepted: 04/01/2023] [Indexed: 04/20/2023]
Abstract
The aim of this observational study was to investigate the influence of different typical preterm diseases on NT-proBNP serum levels in the early postnatal period of life of a preterm infant. NT-proBNP levels of 118 preterm infants born ≤ 31 weeks GA were determined at the first week of life, after 4 ± 1 weeks of life, and at a corrected gestational age of 36 + 2 weeks. Relevant complications with a possible influence on NT-proBNP values in the first week of life such as early neonatal infection, hemodynamically significant PDA (hsPDA), early pulmonary hypertension (early PH), and intraventricular hemorrhage (IVH) were evaluated; at 4 ± 1 weeks of life, bronchopulmonary dysplasia (BPD), BPD-related pulmonary hypertension (BPD-associated PH), late infection, IVH, and intestinal complications were evaluated. At a corrected gestational age of 36 ± 2 weeks, we examined the effect of retinopathy of prematurity (ROP), BPD, BPD-associated PH, and late infection on NT-proBNP levels. In the first days of life, only the isolated occurrence of hsPDA resulted in significantly increased NT-proBNP levels. In multiple linear regression analysis, early infection remained independently associated with NT-proBNP levels. At 4 ± 1 weeks of age, the isolated presence of BPD and BPD-related PH resulted in increased levels, and the effect remained significant in the multiple regression analysis. At a corrected gestational age of 36 ± 2 weeks, infants with relevant complications at this final evaluation time tended to have lower NT-proBNP values than our exploratory reference values. Conlusion: NT-proBNP in the first week of life seems to be mainly influenced by an hsPDA and infection or inflammation. BPD and BPD-related PH are the most important factors influencing NT-proBNP serum levels in the first month of life. When preterm infants reach a corrected GA of 36 ± 2 weeks, chronological age rather than complications of prematurity must be considered when interpreting NT-proBNP levels. What is Known: • Several complications associated with prematurity, such as hemodynamically significant PDA, pulmonary hypertension, bronchopulmonary dysplasia, and retinopathy of prematurity, have been shown to influence NT-proBNP levels in preterm infants in their early postnatal life. What is New: • Hemodynamically relevant PDA is a major factor in the increase of NT-proBNP levels in the first week of life. • Bronchopulmonary dysplasia and pulmonary hypertension associated with bronchopulmonary dysplasia are important factors in the increase in NT-proBNP levels in preterm infants at approximately 1 month of age.
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Affiliation(s)
- Agnes-Sophie Fritz
- Neonatal Intensive Care Unit, University Hospital in Cologne, Kerpener Str. 34, 50937, Cologne, Germany.
| | - Titus Keller
- Neonatal Intensive Care Unit, University Hospital in Cologne, Kerpener Str. 34, 50937, Cologne, Germany
| | - Angela Kribs
- Neonatal Intensive Care Unit, University Hospital in Cologne, Kerpener Str. 34, 50937, Cologne, Germany
| | - Christoph Hünseler
- Neonatal Intensive Care Unit, University Hospital in Cologne, Kerpener Str. 34, 50937, Cologne, Germany
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Cakir U, Tayman C, Tugcu AU, Yildiz D. Role of Systemic Inflammatory Indices in the Prediction of Moderate to Severe Bronchopulmonary Dysplasia in Preterm Infants. Arch Bronconeumol 2023; 59:216-222. [PMID: 36681603 DOI: 10.1016/j.arbres.2023.01.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 01/02/2023] [Accepted: 01/03/2023] [Indexed: 01/09/2023]
Abstract
INTRODUCTION The role of systemic inflammatory indices in the diagnosis of bronchopulmonary dysplasia (BPD) is unknown. The aim of the study was to determine the possible clinical utility of systemic inflammatory indices in the prediction of moderate to severe BPD. METHODS Premature infants<32 weeks of gestational age were included in the study. Neutrophil-to-lymphocyte ratio (NLR), platelet-to-lymphocyte ratio (PLR), monocyte-to-lymphocyte ratio (MLR), systemic immune-inflammation index (SII), pan-immune-inflammation value (PIV), and systemic inflammation response index (SIRI) were calculated at birth and at the time of diagnosis of BPD (at 36th weeks of postmenstrual age). The patients were divided into two groups as no or mild BPD and moderate or severe BPD. RESULTS A total of 1146 infants were included in the study, 957 in Group 1 and 189 in Group 2. The SIRI value was significantly higher in moderate or severe BPD both at birth and at the 36th week of postmenstrual age (p<0.001 and p<0.001, respectively). The AUC value of SIRI was 0.809 and the cut-off value was>0.98 in the predictivity of BPD at birth. The AUC value of SIRI was 0.842 and the cut-off value was>1.33 for the diagnosis of BPD at 36th week of postmenstrual age. After multiple logistic regression analysis, SIRI was shown to be a significant parameter for the diagnosis of BPD (OR 2.847, 95% CI 1.557-4.875). CONCLUSIONS SIRI may be a useful biomarker for predicting moderate to severe BPD and a marker of clinical importance in the follow-up of infants with BPD.
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Affiliation(s)
- Ufuk Cakir
- Division of Neonatology, Health Science University, Ankara Bilkent City Hospital, Ankara, Turkey.
| | - Cuneyt Tayman
- Division of Neonatology, Health Science University, Ankara Bilkent City Hospital, Ankara, Turkey
| | - Ali Ulas Tugcu
- Division of Neonatology, Health Science University, Ankara Bilkent City Hospital, Ankara, Turkey
| | - Duran Yildiz
- Division of Neonatology, Health Science University, Ankara Bilkent City Hospital, Ankara, Turkey
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Hoshino Y, Arai J, Miura R, Takeuchi S, Yukitake Y, Kajikawa D, Kamakura T, Horigome H. Lung Ultrasound for Predicting the Respiratory Outcome in Patients with Bronchopulmonary Dysplasia. Am J Perinatol 2022; 39:1229-1235. [PMID: 33374021 DOI: 10.1055/s-0040-1721848] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE This study aimed to investigate the utility of lung ultrasound (LUS) with whole chest scanning for predicting respiratory outcomes in patients with bronchopulmonary dysplasia (BPD). STUDY DESIGN We performed a prospective observational study. Preterm infants of less than 32 weeks' gestational age requiring oxygen therapy at 28 days of life were included. LUS was performed on day 28, at 36 weeks' postmenstrual age, and at the time of discharge. Each lung was divided into three regions by the anterior and posterior axillary lines and received an LUS score of 0 to 3 points; the total score was obtained by adding the six regional scores. The classification of BPD was determined based on the National Institute of Child and Human Development. The outcomes of this study were the development of moderate-to-severe BPD and the need for home oxygen therapy (HOT). RESULTS We enrolled 87 patients; 39, 33, and 15 infants had mild, moderate, and severe BPD, respectively. The LUS score correlated with BPD severity and exhibited an improvement trend with time toward the point of discharge. LUS at 28 days of life predicted moderate-to-severe BPD with an area under the curve of 0.95 (95% confidence interval: 0.91-0.99) and HOT with an area under the curve of 0.95 (95% confidence interval: 0.81-1.0). CONCLUSION LUS with whole chest scanning is useful for predicting respiratory outcomes in patients with BPD, as well as for understanding BPD severity or clinical improvement trends. KEY POINTS · LUS predicts respiratory outcomes in patients with BPD.. · LUS indicates BPD severity.. · LUS can show clinical improvement with time..
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Affiliation(s)
- Yusuke Hoshino
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Junichi Arai
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Rena Miura
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Syusuke Takeuchi
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Yoshiya Yukitake
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Daigo Kajikawa
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Tae Kamakura
- Department of Neonatology, Ibaraki Children's Hospital, Mito, Japan
| | - Hitoshi Horigome
- Department of Child Health, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan
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8
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Khan SS, Bada HS, Torres M, Almodovar M, Hanna M. The Trend of Urinary N Terminal Probrain Natriuretic Peptide in Extremely Low Birth Weight Infants during the Neonatal Period. Am J Perinatol 2022; 39:1027-1032. [PMID: 34753181 DOI: 10.1055/a-1692-1039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE N-terminal probrain natriuretic peptide (NT-proBNP) is a biomarker of interest in many cardiopulmonary diseases in extremely low birth weight (ELBW) Infants. However, there is a gap in knowledge about the trend of ELBW infant's urinary NT-proBNP during the neonatal period. AIM To determine the trend of urinary NT-proBNP during the first 4 weeks of life of an ELBW infant. STUDY DESIGN We analyzed prospectively enrolled 87 ELBW infants. Urinary NT-proBNP to creatinine ratios were measured on days 1 to 7, 14, and 28 of life. We plotted each study point's means to determine the trend of urinary NT-proBNP over the entire neonatal period. Data were analyzed using the Friedman analysis of variance for comparative analysis of study points. RESULTS Urinary NT-proBNP/creatinine ratios were significantly elevated on days 1 to 7 (mean 2,452, ± 1,518) than day 14 (mean 747, ± 176), and day 28 (mean 149, ± 54), p = 0.001. Overall, urinary NT-proBNP levels were highest during days 1 to 3 (mean 3,232, ± 1,255) and lowest on day 28 (mean 149, ± 54). CONCLUSION Urinary NT-proBNP levels are higher during the first week in ELBW infants with a downward trend during the neonatal period, the lowest values at 4 weeks postnatal age. More studies are required to determine the clinical utility of this trend during and beyond the neonatal period. KEY POINTS · NT-proBNP is a biomarker for monitoring cardiac disease in premature infants.. · The trend of urinary NT-proBNP is unknown in premature infants.. · A trend of urinary NT-proBNP was determined during the first 4 weeks in premature infants..
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Affiliation(s)
- Safdar S Khan
- Division of Neonatology, Department of Pediatrics, University of Miami Miller School of Medicine, Miami, Florida
| | - Henrietta S Bada
- Division of Neonatology, Department of Pediatrics, College of Medicine, University of Kentucky, Lexington, Kentucky
| | - Maritza Torres
- Division of Neonatology, Department of Pediatrics, University of Miami Miller School of Medicine, Miami, Florida
| | - Melvin Almodovar
- Division of Pediatric Cardiology, Department of Pediatrics, University of Miami Miller School of Medicine, Miami, Florida
| | - Mina Hanna
- Division of Neonatology, Department of Pediatrics, College of Medicine, University of Kentucky, Lexington, Kentucky
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Wang H, Yan D, Wu Z, Geng H, Zhu X, Zhu X. Predictive values of clinical data,molecular biomarkers, and echocardiographic measurements in preterm infants with bronchopulmonary dysplasia. Front Pediatr 2022; 10:1070858. [PMID: 36923947 PMCID: PMC10008901 DOI: 10.3389/fped.2022.1070858] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Accepted: 11/30/2022] [Indexed: 03/01/2023] Open
Abstract
Objective We aimed to use molecular biomarkers and clinical data and echocardiograms that were collected during admission to predict bronchopulmonary dysplasia (BPD) in preterm infants with gestational age ≤32 weeks. Methods Eighty-two patients (40 with BPD, BPD group and 42 healthy as controls, non-BPD group) admitted to the Department of Neonatology of the Children's Hospital of Soochow University between October 1, 2018, and February 29, 2020, were enrolled in this study at the tertiary hospital. Basic clinical data on the perinatal period, echocardiographic measurements, and molecular biomarkers (N-terminal-pro-B-brain natriuretic peptide, NT-proBNP) were collected. We used multiple logistic regression analysis to establish an early predictive model for detecting BPD development in preterm infants of gestational age ≤32 weeks. We also used a receiver operating characteristic curve to assess the sensitivity and specificity of the model. Results No significant differences were found between the BPD and non-BPD groups in terms of sex, birth weight, gestational age, incidence of asphyxia, maternal age, gravidity, parity, mode of delivery, premature rupture of membranes >18 h, use of prenatal hormones, placental abruption, gestational diabetes mellitus, amniotic fluid contamination, prenatal infections, and maternal diseases. The use of caffeine, albumin, gamma globulin; ventilation; days of FiO2 ≥ 40%; oxygen inhalation time; red blood cell suspension infusion volume (ml/kg); and proportion of infants who received total enteral nutrition (120 kcal/kg.d) ≥24 d after birth were higher in the BPD group than in the non-BPD group. The levels of hemoglobin, hematocrit, and albumin in the BPD group were significantly lower than those in the non-BPD group. The total calorie intake was significantly lower in the BPD group on the 3rd, 7th, and 14th day after birth than in the non-BPD group (P < 0.05). The incidence rates of patent ductus arteriosus (PDA), pulmonary hypertension, and tricuspid regurgitation were significantly higher in the BPD group than in the non-BPD group (P < 0.05). The serum level of NT-proBNP 24 h after birth was significantly higher in the BPD group than in the non-BPD group (P < 0.05). Serum NT-proBNP levels were significantly higher in infants with severe BPD than in those with mild or moderate BPD (P < 0.05). Conclusion As there were various risk factors for BPD, a combining clinical data, molecular biomarkers, and echocardiogram measurements can be valuable in predicting the BPD. The tricuspid regurgitation flow rate (m/s), NT-proBNP (pg/ml), ventilator-associated pneumonia, days of FiO2 ≥ 40% (d), red blood cell suspension infusion volume (ml/kg), and proportion of infants who received total enteral nutrition (120 kcal/kg.d) ≥24 d after birth were the most practical factors considered for designing an appropriate model for predicting the risk of BPD.
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Affiliation(s)
- Huawei Wang
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China
| | - Dongya Yan
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China.,Department of Neonatology, Children's Hospital of Anhui Province, Hefei, China
| | - Zhixin Wu
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China
| | - Haifeng Geng
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China
| | - Xueping Zhu
- Department of Neonatology, Children's Hospital of Soochow University, Suzhou, China
| | - Xiaoli Zhu
- Department of Intervention, The First Affiliated Hospital of Soochow University, Suzhou, China
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10
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Cui X, Fu J. Urinary biomarkers for the early prediction of bronchopulmonary dysplasia in preterm infants: A pilot study. Front Pediatr 2022; 10:959513. [PMID: 36034571 PMCID: PMC9403535 DOI: 10.3389/fped.2022.959513] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 07/27/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND This study investigated whether 8-hydroxy-2'-deoxyguanosine (8-OHdG) and N-terminal pro-brain natriuretic peptide (NT-proBNP) concentrations in the urine could predict bronchopulmonary dysplasia (BPD) in preterm infants. METHODS This prospective cohort study enrolled 165 preterm infants, of whom 70 developed BPD. We measured urinary 8-OHdG and NT-proBNP concentrations from day of life (DOL) 7 to 28. Then, we evaluated the prediction efficiency by receiver operating characteristic curves and assessed correlations between the two biomarkers. Finally, we identified the predictive risk factors for BPD by multivariable logistic regression. RESULTS 8-OHdG and NT-proBNP levels were significantly higher from DOL 7 to 28 in the BPD group than in the control group (P < 0.05). Additionally, the 8-OHdG level was positively correlated with the NT-proBNP level (r: 0.655-0.789, P < 0.001), and the 8-OHdG and NT-proBNP levels were positively correlated with mechanical ventilation duration and oxygen exposure time (r: 0.175-0.505, P < 0.05) from DOL 7 to 28. Furthermore, the 8-OHdG (DOL 14-28) and NT-proBNP (DOL 7-28) levels were significantly associated with BPD development (P < 0.05). CONCLUSION The urine 8-OHdG concentrations from DOL 14 to 28 and NT-proBNP concentrations from DOL 7 to 28 may be practical non-invasive predictors of BPD development in preterm infants.
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Affiliation(s)
- Xuewei Cui
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Jianhua Fu
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, China
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11
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Respiratory morbidity in preterm infants predicted by natriuretic peptide (MR-proANP) and endothelin-1 (CT-proET-1). Pediatr Res 2022; 91:1478-1484. [PMID: 33958715 PMCID: PMC8100356 DOI: 10.1038/s41390-021-01493-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 03/09/2021] [Accepted: 03/11/2021] [Indexed: 11/25/2022]
Abstract
BACKGROUND Bronchopulmonary dysplasia (BPD) is a major complication in preterm infants <32 weeks. We aimed to assess whether plasma levels of mid-regional pro-atrial natriuretic peptide (MR-proANP) and C-terminal pro-endothelin-1 (CT-proET-1) predict respiratory morbidity. METHODS This was a prospective, two-center, observational cohort study. MR-proANP and CT-proET-1 were measured at day 7 (±2) of life. Associations with duration of supplemental oxygen and the composite outcome of moderate or severe BPD or death (BPD/death) were investigated. RESULTS Two hundred and twenty-nine infants <32 weeks were included (median gestational age [GA] 29.6 weeks [interquartile range 29.0-30.7], median birth weight 1150 g [IQR 840-1410]). MR-proANP and CT-proET-1 were associated with the duration of supplemental oxygen in univariable analysis (both p < 0.001) but not after adjusting for co-factors. Infants with BPD/death showed higher plasma levels of MR-proANP (623.50 pmol/L [IQR 458.50-881.38] vs. 308.35 pmol/L [IQR 216.72-538.10]; p < 0.001) and CT-proET-1 (255.40 pmol/L [IQR 202.60-311.15] vs. 198.30 pmol/L [IQR 154.70-297.95]; p = 0.015) compared to infants without BPD/death. Levels of both biomarkers were significantly associated with BPD/death in univariable models but not after adjusting for co-factors. CONCLUSIONS MR-proANP and CT-proET-1 are associated with the duration of supplemental oxygen and the composite outcome BPD/death, but their prognostic value does not complement that of clinical risk factors. IMPACT Plasma levels of MR-proANP and CT-proET-1, measured on day 7 of life (±2 days) are associated in univariable analyses with duration of supplemental oxygen and the combined outcome of BPD or death in VLGA infants. Associations between both biomarkers and respiratory morbidity do not persist in multivariable models, in particular when gestational age is included. MR-proANP and CT-proET-1 have limited additional value to predict respiratory morbidity in VLGA infants compared to clinical parameters.
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Song M, Lei M, Luo C, Shi Z, Cheng X, Ding W, Cao W, Zhang J, Ge J, Wang M, Xia P, Mao F, Wang L, Zhang Q. Development of a Nomogram for Moderate-to-Severe Bronchopulmonary Dysplasia or Death: Role of N-Terminal Pro-brain Natriuretic Peptide as a Biomarker. Front Pediatr 2021; 9:727362. [PMID: 34497786 PMCID: PMC8419419 DOI: 10.3389/fped.2021.727362] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 08/02/2021] [Indexed: 11/13/2022] Open
Abstract
Objectives: This study aimed to explore the clinical value of N-terminal pro-brain natriuretic peptide (NT-proBNP) in predicting moderate-to-severe bronchopulmonary dysplasia (BPD)/death, and to establish an effective clinical predictive nomogram. Methods: We retrospectively analyzed very low birth weight infants (VLBWs) with gestational age ≤ 32 weeks. The NT-proBNP values were determined on the 1st, 3rd, 7th, 14th, 21st, and 28th days after birth. The correlation between NT-proBNP level and moderate-to-severe BPD/death was evaluated. Receiver operating characteristic (ROC) curve analysis was used to evaluate the prediction ability. Then, we used multivariable logistic regression to build the prediction model and nomogram, and calibration of the model was assessed by calibration curve. Results: In total, 556 VLBWs were involved, among whom 229 developed BPD (mild: n = 109; moderate: n = 68; severe: n = 52) and 18 died. The NT-proBNP level in the moderate-to-severe BPD/death group was significantly higher than that in the no-to-mild BPD group from the 3rd to 28th day (P < 0.001). When the natural logarithm of the serum NT-ProBNP level increased by 1 unit at day 7 (±2 days) of life, the risk of moderate and severe BPD/death was the highest (OR = 3.753; 95% CI: 2.984~4.720), and ROC analysis identified an optimal cutoff point of 3360 ng/L (sensitivity: 80.0%; specificity: 86.2%; AUC: 0.861). After adjusting for confounding factors, the level of NT-proBNP at day 7 (±2 days) of life still had important predictive value for the development of moderate-to-severe BPD/death, significantly improving the predictive ability of the model. Conclusion: The level of NT-proBNP at day 7 (±2 days) of life can be used as an early promising biomarker for VLBWs to develop moderate-to-severe BPD/death. We constructed an early predictive nomogram to help clinicians identify high-risk populations.
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Affiliation(s)
- Min Song
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Mengyuan Lei
- Health Care Department, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Chenghan Luo
- Orthopeadics Department, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Zanyang Shi
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xinru Cheng
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Wenqian Ding
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Wenjun Cao
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jingdi Zhang
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Jian Ge
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Mengmeng Wang
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Peige Xia
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Fengxia Mao
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Li Wang
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Qian Zhang
- Neonatal Intensive Care Unit, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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Iliodromiti Z, Christou E, Vrachnis N, Sokou R, Vrachnis D, Mihopoulou G, Boutsikou T, Iacovidou N. Serum and Urinary N-Terminal Pro-brain Natriuretic Peptides as Biomarkers for Bronchopulmonary Dysplasia of Preterm Neonates. Front Pediatr 2020; 8:588738. [PMID: 33194922 PMCID: PMC7655774 DOI: 10.3389/fped.2020.588738] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 09/14/2020] [Indexed: 11/13/2022] Open
Abstract
Bronchopulmonary dysplasia (BPD) is a common cause of respiratory illness in preterm newborns with high morbidity and mortality rates. At present, there are no early prognostic biomarkers that can be used in clinical practice to predict the development of BPD. In this review, we critically appraise evidence regarding the use of serum N-terminal pro-brain natriuretic peptide (NTproBNP) levels as a biomarker for BPD in neonates. Furthermore, we summarize studies assessing the feasibility of urinary NTproBNP levels as a non-invasive method to predict BPD in preterm infants. Multiple studies reported a strong association between NTproBNP serum levels and the onset of BPD. For urinary NTproBNP there is scarce evidence showing an association with BPD. Given the promising data obtained by preliminary studies, further assessment of this biomarker in both serum and urine is needed. Standardized reference values should be defined before conducting any further clinical studies.
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Affiliation(s)
- Zoi Iliodromiti
- Neonatal Department, Aretaieio Hospital, Medical School of National and Kapodistrian University of Athens, Athens, Greece
| | - Evangelos Christou
- Neonatal Department, Aretaieio Hospital, Medical School of National and Kapodistrian University of Athens, Athens, Greece
| | - Nikolaos Vrachnis
- Third Obstetrics and Gynecology Department, Attikon Hospital, Medical School of National and Kapodistrian University of Athens, Athens, Greece.,Molecular and Clinical Sciences Research Institute, St George's University of London, London, United Kingdom
| | - Rozeta Sokou
- NICU, "Agios Panteleimon" General Hospital of Nikaia, Piraeus, Greece
| | - Dionysios Vrachnis
- Endocrinology Unit, Second Obstetrics and Gynecology Department, Aretaieio Hospital, Medical School of National and Kapodistrian University of Athens, Athens, Greece
| | - Georgia Mihopoulou
- Second Obstetrics and Gynecology Department, Aretaieio Hospital, Medical School of National and Kapodistrian University of Athens, Athens, Greece
| | - Theodora Boutsikou
- Neonatal Department, Aretaieio Hospital, Medical School of National and Kapodistrian University of Athens, Athens, Greece
| | - Nicoletta Iacovidou
- Neonatal Department, Aretaieio Hospital, Medical School of National and Kapodistrian University of Athens, Athens, Greece
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