Preterm Born Infants Research Articles

Systemic Inflammatory Indices as Predictors of Lung Maturation in Preterm Infants Born Before 32 Weeks of Gestation

AbstractIncreased inflammation in premature infants in the prenatal period reduces respiratory distress syndrome (RDS). Several systemic inflammatory indices have been used to evaluate inflammatory responses in different pathologies. Our study aimed to determine the systemic inflammatory indices as predictors of lung maturation in preterm infants born before 32 weeks of gestation. In this study, preterm infants born before 32 weeks of gestation were enrolled and categorized based on the diagnosis of RDS. At birth, infants were assessed for various systemic inflammatory indices, including the systemic immune-inflammation index (SII), pan-immune-inflammation value (PIV), systemic inflammation response index (SIRI), and the monocyte-to-lymphocyte ratio (MLR), neutrophil-to-lymphocyte ratio (NLR), and platelet-to-lymphocyte ratio (PLR). The study included 365 infants, of whom 211 had RDS. The median gestational ages (GA) were 27 (range: 25–29) and 30 (range: 29–31) weeks, and the median birth weights were 850 (range: 660–1,360) and 1,375 (1,090–1,600) g in the RDS and control groups, respectively. Infants in the RDS group had significantly lower MLR, NLR, PIV, SII, and SIRI values (p = 0.001) compared to the control group. The cutoff values for predicting RDS in the whole group were 239 for SII, 0.44 for SIRI, and 78 for PIV. For the group of preterm infants born at ≤28 weeks of gestation, values of 171, 0.5, and 87 for SII, SIRI and PIV, respectively, provided the best ability to predict RDS. For the whole cohort, SII level ≥239 was associated with a reduced risk of RDS, as revealed by multivariate analyses (p = 0.001). To account for GA, we performed regression analyses for infants born at ≤28 weeks. SII ≥171 (odds ratio [OR]: 0.12; 95% confidence interval [CI]: 0.05–0.3), PIV ≥87 (OR: 0.08; 95% CI: 0.03–0.21), and SIRI ≥0.5 (OR: 0.08; 95% CI: 0.03–0.2) were associated with a reduced risk of RDS. Inflammation in the perinatal period may reduce the frequency of RDS in premature infants.

Attitudes and Experiences Among Swedish NICU Nurses Regarding Skin-to-Skin Care of Infants Born at 22-23 Weeks of Gestation.

Skin-to-skin care (SSC) is an evidence-based care method for preterm-born infants. Staff may hesitate to initiate early SSC, the first or second week of life, for the most extremely preterm infants; 1 reason could be nurses' attitudes. The aim was to investigate the attitudes and experiences of neonatal nurses regarding early SSC for the most extremely preterm infants, born at gestational week (GW) 22-23, using an exploratory and descriptive approach. A web-based survey was sent to all nurses across the 6 Swedish units routinely caring for the most extremely preterm infants. Descriptive statistics and qualitative content analysis were used to analyze the data. The response rate was 258 out of 547 (47%). This study reveals a spectrum of attitudes and experiences among nurses, ranging from viewing early SSC as an integral aspect of infant care to deeming it very challenging or simply not feasible. The outcomes are presented in 2 categories, describing both facilitators and challenges associated with early SSC. Noteworthy, facilitators include well-implemented guidelines that support early SSC. Conversely, challenges encompass knowledge gaps and the scarcity of scientific evidence demonstrating the safety of all SSC, including early, for the most extremely preterm infants. This study underscores the importance of spreading knowledge, and has clinical adapted guidelines about the practical aspects of SSC for infants born at 22-23 GW. Future research is required to clarify safety aspects pertaining to SSC for the most extremely preterm infants.

The developing immune system in preterm born infants: From contributor to potential solution for respiratory tract infections and wheezing.

Moderate-late preterm-born infants experience more frequent and severe respiratory tract infections and wheezing compared to term-born infants. Decreasing the risk on respiratory tract infections and wheezing in this group is vital to improve quality of life and reduce medical consumption during infancy, but also to reduce the risk on asthma and COPD later in life. Until now, moderate-late preterm infants are underrepresented in research and mechanisms underlying their morbidity are largely unknown, although they represent 80% of all preterm-born infants. In order to protect these infants effectively, it is essential to understand the role of the immune system in early life respiratory health and to identify strategies to optimize immune development and respiratory health. This review elaborates on risk factors and preventative measures concerning respiratory tract infections and wheezing in preterm-born infants, exploring their impact on the immune system and microbiome. Factors discussed are early life antibiotic use, birth mode, feeding type and living environment. Further, differences in adaptive and innate immune maturation between term and preterm infants are discussed, as well as differences in local immune reactions in the lungs. Finally, preventative strategies are being explored, including microbiota transplantation, immune modulation (through pre-, pro-, syn- and postbiotics, bacterial lysates, vaccinations, and monoclonal antibodies) and antibiotic prophylaxis.

Effectiveness of a Novel Feeding Algorithm for Oral Feeding Transition of Infants Born Prematurely.

Feeding skill acquisition is commonly a limiting factor determining when an infant born prematurely can be discharged. This study aimed to determine if the addition of a novel feeding progression algorithm (combination of objective data from a suck measurement device and slow flow/low variability nipples) to current neonatal intensive care unit (NICU) standards could decrease feeding-related length of stay (primary outcome). We hypothesized that by timing the initiation of oral feedings to coincide with adequate sensory-motor skill development, feeding-related length of stay may be decreased. This was a prospective intervention study, with a historical control cohort, of infants born less than 30weeks' gestational age without comorbidities affecting feeding skill acquisition at a Regional Level III-S NICU at a women and infant's hospital in Louisiana. A novel feeding progression algorithm utilized objective assessment of sucking to determine progression in nipple flow rates with slow flow/low variability nipples (flow rates from 0 to 9 mL/min) for infants receiving intervention (n=18). Thirty-six controls who did not receive the feeding progression algorithm were identified via electronic medical record retrospective chart review. Eighteen completed the study. Compared to the control group, infants receiving feeding interventions had delayed sequencing initiation, extended time between initially off positive pressure ventilation and initiation of sequencing, and decreased feeding-related length of stay, with similar total length of stay. This study adds to existing research supporting the effectiveness of novel feeding progression algorithms and interventions to support the health and outcomes of infants born prematurely. Future research should focus on implementation studies for feeding progression algorithm integration into standard NICU care.

Feasibility of a Dutch post-discharge parenting intervention (TOP program) for moderate preterm born infants

Background and aimModerate preterm (MP) birth is associated with an increased risk of developmental problems. However, post-discharge support for this group is scarce. The aim of this study was to evaluate the feasibility of a post-discharge parenting program (TOP program) for MP infants. Three feasibility dimensions were evaluated (1) recruitment capability and compliance, (2) intervention acceptability, and (3) limited efficacy testing. MethodsA group of MP infants with a gestational age (GA) between 320/7‐346/7 weeks and their parents received six home visits by a TOP interventionist until 6 months corrected age (CA). A pre-posttest intervention design with quantitative and qualitative measures was used.Recruitment capability and compliance, acceptability, and satisfaction with the intervention were evaluated using a questionnaire, checklists, interviews, and a focus group. Infant socio-emotional development, parental distress, self-efficacy, and reflective functioning were measured with questionnaires. Observation measurements were used for infant motor development and parental sensitivity. ResultsThirty-two families completed the six home visits. The satisfaction rate (scale 0–10) was remarkably high (Mean 9.4, range: 8–10). Parents reported that the program was suitable, enhanced their understanding of their infants' developmental needs, and increased their self-efficacy. The infants showed age-appropriate motor and socio-emotional development post-intervention. Parental self-efficacy, reflective functioning, and sensitivity improved from pre to post intervention, with small to large effect sizes. ConclusionThe study demonstrated high compliance, acceptability, and satisfaction with the TOP program for MP infants with promising infant and parent outcomes. This study contributes to the preparatory work prior to a larger scale evaluation and dissemination.

The respiratory consequences of preterm birth: from infancy to adulthood.

Survival of preterm-born infants, especially at extremes of prematurity (less than 28 weeks gestation), is now common, particularly in the developed world. Despite advances in neonatal care, short-term respiratory morbidity, termed bronchopulmonary dysplasia (also called chronic lung disease of prematurity), remains an important clinical outcome. As survival during the neonatal period has improved, preterm-born individuals are now entering childhood, adolescence and adulthood in far greater numbers, and adverse longer-term respiratory outcomes following birth at an immature stage of lung development are becoming increasingly apparent. In this article, we shall review the background of the major respiratory complications in the neonatal period, bronchopulmonary dysplasia, and the current evidence regarding its prevention and management. In addition, we shall review the emerging literature on the respiratory morbidity experienced in childhood, adolescence, and adulthood by preterm-born survivors, with reduced lung function and a risk of developing chronic obstructive pulmonary disease in early adult life. As this population of preterm-born individuals increases, an understanding of the respiratory consequences of preterm birth will become increasingly important not only for neonatologists, paediatricians and paediatric pulmonologists but also for physicians and healthcare professionals involved in the care of adults who were born preterm.

Effect of Palivizumab Prophylaxis on Respiratory Syncytial Virus Hospitalizations in Preterm Infants Born to 290/7 to 316/7 Weeks of Gestational Age

Effect of Palivizumab Prophylaxis on Respiratory Syncytial Virus Hospitalizations in Preterm Infants Born to 290/7 to 316/7 Weeks of Gestational Age

Arachidonic acid metabolism regulates the development of retinopathy of prematurity among preterm infants.

Extremely preterm infants are at risk of developing retinopathy of prematurity (ROP), characterized by neovascularization and neuroinflammation leading to blindness. Polyunsaturated fatty acid (PUFA) supplementation is recommended in preterm infants to lower the risk of ROP, however, with no significant improvement in visual acuity. Reasonably, this could be as a result of the non-consideration of PUFA metabolizing enzymes. We hypothesize that abnormal metabolism of the arachidonic acid (AA) pathway may contribute to severe stages of ROP. The present study investigated the AA-metabolizing enzymes in ROP pathogenesis by a targeted gene expression analysis of blood (severe ROP = 70, No/Mild = 56), placenta (preterm placenta = 6, full term placenta = 3), and human primary retinal cell cultures and further confirmed at the protein level by performing IHC in sections of ROP retina. The lipid metabolites were identified by LC-MS in the vitreous humor (VH; severe ROP = 15, control = 15). Prostaglandins D2 (p = 0.02), leukotrienes B5 (p = 0.0001), 11,12-epoxyeicosatrienoic acid (p = 0.01), and lipid-metabolizing enzymes of the AA pathway such as CYP1B1, CYP2C8, COX2, and ALOX15 were significantly upregulated while EPHX2 was significantly (0.04) downregulated in ROP cases. Genes involved in hypoxic stress, angiogenesis, and apoptosis showed increased expression in ROP. An increase in the metabolic intermediates generated from the AA metabolism pathway further confirmed the role of these enzymes in ROP, while metabolites for EPHX2 activity were low in abundance. Inflammatory lipid intermediates were higher compared to anti-inflammatory lipids in VH and showed an association with enzyme activity. Both the placenta of preterm infants who developed ROP and hypoxic retinal cultures showed a reduced expression of EPHX2. These findings suggested a strong involvement of EPHX2 in regulating retinal neovascularization and inflammation. The study results underscore the role of arachidonic acid metabolism in the development of ROP and as a potential target for preventing vision loss among preterm-born infants.

Doctor-Parent Disagreement for Preterm Infants Born in the Grey Zone: Do Ethical Frameworks Help?

To examine i) how ethical frameworks can be used in concrete cases of parent-doctors' disagreements for extremely preterm infants born in the grey zone to guide such difficult decision-making; and ii) what challenges stakeholders may encounter in using these frameworks. We did a case analysis of a concrete case of parent-doctor disagreement in the grey zone using two ethical frameworks: the best interest standard and the zone of parental discretion. Both ethical frameworks entailed similar advantages and challenges. They have the potential 1) to facilitate decision-making because they follow a structured method; 2) to clarify the situation because all relevant ethical issues are explored; and 3) to facilitate reaching an agreement because all parties can explain their views. We identified three main challenges. First, how to objectively evaluate the risk of severe disability. Second, parents' interests should be considered but it is not clear to what extent. Third, this is a value-laden situation and different people have different values, meaning that the frameworks are at least partially subjective. These challenges do not mean that the ethical frameworks are faulty; rather, they reflect the complexity and the sensitivity of cases in the grey zone.

Umbilical Cord Plasma Ferritin Concentration as a Proxy Measure of Infant Iron Status: An Exploratory Analysis Among Term and Preterm Infants Born in Vancouver, Canada

Umbilical Cord Plasma Ferritin Concentration as a Proxy Measure of Infant Iron Status: An Exploratory Analysis Among Term and Preterm Infants Born in Vancouver, Canada

Correlation between Early Visual Functions and Cognitive Outcome in Infants at Risk for Cerebral Palsy or Other Neurodevelopmental Disorders: A Systematic Review.

Early key visual skills, such as tracking objects, sustaining gaze, and shifting attention, rapidly develop within the first 6 months of infant life. These abilities play a significant role in the development of cognitive functions but are frequently compromised in infants at risk of developing neurodevelopmental disorders. This systematic review evaluates the potential of early vision function in the prediction of cognition at or above 12 months. Five databases were searched for relevant articles, and their quality was assessed with the Quality Assessment of Diagnostic Accuracy Studies tool. Eight studies were suitable, including 521 preterm-born infants at varying risk of developing Cerebral Palsy (CP). Each study showed a significant correlation between vision and cognitive outcome. Predictive analysis including sensitivity and specificity was possible for three studies. Methodological quality was variable. Sensitivity ranged between 57 and 100% in the vision function assessments items, while specificity ranged from 59 to 100%. In conclusion, early vision showed strong correlation with cognition ≥ 12 months. While no single vision assessment was found to be superior, evaluation of specific functions, namely fixation and following, both at term age and between 3 and 6 months, demonstrated strong predictive validity.

Dolphin CONTINUE: a multi-center randomized controlled trial to assess the effect of a nutritional intervention on brain development and long-term outcome in infants born before 30 weeks of gestation

BackgroundPreterm born infants are at risk for brain injury and subsequent developmental delay. Treatment options are limited, but optimizing postnatal nutrition may improve brain- and neurodevelopment in these infants. In pre-clinical animal models, combined supplementation of docosahexaenoic acid (DHA), choline, and uridine-5-monophosphate (UMP) have shown to support neuronal membrane formation. In two randomized controlled pilot trials, supplementation with the investigational product was associated with clinically meaningful improvements in cognitive, attention, and language scores. The present study aims to assess the effect of a similar nutritional intervention on brain development and subsequent neurodevelopmental outcome in infants born very and extremely preterm.MethodsThis is a randomized, placebo-controlled, double-blinded, parallel-group, multi-center trial. A total of 130 infants, born at less than 30 weeks of gestation, will be randomized to receive a test or control product between term-equivalent age and 12 months corrected age (CA). The test product is a nutrient blend containing DHA, choline, and UMP amongst others. The control product contains only fractions of the active components. Both products are isocaloric powder supplements which can be added to milk and solid feeds. The primary outcome parameter is white matter integrity at three months CA, assessed using diffusion-tensor imaging (DTI) on MRI scanning. Secondary outcome parameters include volumetric brain development, cortical thickness, cortical folding, the metabolic and biochemical status of the brain, and product safety. Additionally, language, cognitive, motor, and behavioral development will be assessed at 12 and 24 months CA, using the Bayley Scales of Infant Development III and digital questionnaires (Dutch version of the Communicative Development Inventories (N-CDI), Ages and Stages Questionnaire 4 (ASQ-4), and Parent Report of Children’s Abilities – Revised (PARCA-R)).DiscussionThe investigated nutritional intervention is hypothesized to promote brain development and subsequent neurodevelopmental outcome in preterm born infants who have an inherent risk of developmental delay. Moreover, this innovative study may give rise to new treatment possibilities and improvements in routine clinical care.Trial registrationWHO International Clinical Trials Registry: NL-OMON56181 (registration assigned October 28, 2021).

Age-dependent functional development pattern in neonatal brain: An fMRI-based brain entropy study

The relationship between brain entropy (BEN) and early brain development has been established through animal studies. However, it remains unclear whether the BEN can be used to identify age-dependent functional changes in human neonatal brains and the genetic underpinning of the new neuroimaging marker remains to be elucidated. In this study, we analyzed resting-state fMRI data from the Developing Human Connectome Project, including 280 infants who were scanned at 37.5–43.5 weeks postmenstrual age. The BEN maps were calculated for each subject, and a voxel-wise analysis was conducted using a general linear model to examine the effects of age, sex, and preterm birth on BEN. Additionally, we evaluated the correlation between regional BEN and gene expression levels. Our results demonstrated that the BEN in the sensorimotor-auditory and association cortices, along the ‘S-A’ axis, was significantly positively correlated with postnatal age (PNA), and negatively correlated with gestational age (GA), respectively. Meanwhile, the BEN in the right rolandic operculum correlated significantly with both GA and PNA. Preterm-born infants exhibited increased BEN values in widespread cortical areas, particularly in the visual-motor cortex, when compared to term-born infants. Moreover, we identified five BEN-related genes (DNAJC12, FIG4, STX12, CETN2, and IRF2BP2), which were involved in protein folding, synaptic vesicle transportation and cell division. These findings suggest that the fMRI-based BEN can serve as an indicator of age-dependent brain functional development in human neonates, which may be influenced by specific genes.

The Role of the Airway and Gut Microbiome in the Development of Chronic Lung Disease of Prematurity.

Chronic lung disease (CLD) of prematurity, a common cause of morbidity and mortality in preterm-born infants, has a multifactorial aetiology. This review summarizes the current evidence for the effect of the gut and airway microbiota on the development of CLD, highlighting the differences in the early colonisation patterns in preterm-born infants compared to term-born infants. Stool samples from preterm-born infants who develop CLD have less diversity than those who do not develop CLD. Pulmonary inflammation, which is a hallmark in the development of CLD, may potentially be influenced by gut bacteria. The respiratory microbiota is less abundant than the stool microbiota in preterm-born infants. There is a lack of clear evidence for the role of the respiratory microbiota in the development of CLD, with results from individual studies not replicated. A common finding is the presence of a single predominant bacterial genus in the lungs of preterm-born infants who develop CLD. Probiotic preparations have been proposed as a potential therapeutic strategy to modify the gut or lung microbiota with the aim of reducing rates of CLD but additional robust evidence is required before this treatment is introduced into routine clinical practice.

Association of Antenatal Corticosteroids with Neonatal Outcomes among Very Preterm Infants Born to Mothers with Clinical Chorioamnionitis: A Multicenter Cohort Study.

The objective of this study was to assess the relationship of ACS with neonatal outcomes among very preterm infants born to mothers with clinical chorioamnionitis in China. This was a multicenter retrospective cohort study. Study participants included infants born at <32 weeks' gestation with clinical chorioamnionitis and registered in the Chinese Neonatal Network from 1 January 2019 to 31 December 2020. Infants were divided into two groups: any amount of ACS or no administration of ACS. Multivariable generalized linear models using generalized estimating equations were used to assess the association between ACS and neonatal outcomes among the study population. We identified 2193 infants eligible for this study; 1966 (89.6%) infants had received ACS therapy, and 227 (10.4%) had not received any ACS therapy. Among very preterm infants born to mothers with clinical chorioamnionitis, any ACS usage was significantly associated with decreased risks of early death (aRR 0.56, 95% CI 0.32, 0.99) and severe ROP (aRR 0.51, 95% CI 0.28, 0.93) after adjustment for maternal hypertension, gestational age at birth, Caesarean section, being inborn, and administration of systemic antibiotics to the mother within 24 h before birth. In addition, out of the 2193 infants, the placentas of 1931 infants underwent pathological examination with recorded results. Subsequently, 1490 of these cases (77.2%) were diagnosed with histological chorioamnionitis. In 1490 cases of histologic chorioamnionitis, any ACS usage was significantly related to decreased risks of overall mortality (aRR 0.52, 95% CI 0.31, 0.87), severe ROP (aRR 0.47, 95% CI 0.25, 0.97), and respiratory distress syndrome (aRR 0.52, 95% CI 0.31, 0.87). We concluded that any ACS was associated with reduced risks for neonatal early death and severe ROP among very preterm infants born to mothers with clinical chorioamnionitis.

Quality Improvement Project to Reduce Admission Hypothermia of Preterm Infants Born at Less than 32 Weeks or 1,500 g

Purpose: Hypothermia upon admission to the neonatal intensive care unit (NICU) contributes significantly to various neonatal complications, particularly in preterm infants. This study aimed to assess the impact of quality improvement (QI) interventions, including using plastic bags and head caps, and adjusting delivery room temperatures, on improving the admission body temperature and reducing hypothermia in infants born at less than 32 weeks or weighing 1,500 g.Methods: This study retrospectively analyzed the medical records of infants born at less than 32 weeks or weighing 1,500 g who admitted to the NICU at Samsung Medical Center from January 2022 to February 2024. The QI program that was initiated in April 2023 focused on managing admission temperatures using plastic bags and head caps, and maintaining delivery room temperatures at ≥25 °C. The admission temperature and short-term outcomes pre- and post-QI were compared.Results: In a study of 270 patients, implementing QI initiatives significantly raised the admission temperature from 36.2±0.5 to 36.4±0.4 °C (p&lt;0.01), particularly impacting infants weighing ≥1,000 g, in whom mild hypothermia occurrences dropped from 76.3% to 43.9% (p&lt;0.01). This improvement in temperature management significantly decreased both mild and severe hypothermia rates post-QI. Additionally, implementing all three initiatives was more effective than when two or fewer initiatives were implemented.Conclusion: Simple and cost-effective QI interventions can increase admission temperatures and decrease hypothermia in neonates. Further research is essential to explore the long-term outcomes and develop effective hypothermia management strategies in neonatal care.

The gut microbiome, resistome, and mycobiome in preterm newborn infants and mouse pups: lack of lasting effects by antimicrobial therapy or probiotic prophylaxis

BackgroundEnhancing our understanding of the underlying influences of medical interventions on the microbiome, resistome and mycobiome of preterm born infants holds significant potential for advancing infection prevention and treatment strategies. We conducted a prospective quasi-intervention study to better understand how antibiotics, and probiotics, and other medical factors influence the gut development of preterm infants. A controlled neonatal mice model was conducted in parallel, designed to closely reflect and predict exposures. Preterm infants and neonatal mice were stratified into four groups: antibiotics only, probiotics only, antibiotics followed by probiotics, and none of these interventions. Stool samples from both preterm infants and neonatal mice were collected at varying time points and analyzed by 16 S rRNA amplicon sequencing, ITS amplicon sequencing and whole genome shotgun sequencing.ResultsThe human infant microbiomes showed an unexpectedly high degree of heterogeneity. Little impact from medical exposure (antibiotics/probiotics) was observed on the strain patterns, however, Bifidobacterium bifidum was found more abundant after exposure to probiotics, regardless of prior antibiotic administration. Twenty-seven antibiotic resistant genes were identified in the resistome. High intra-variability was evident within the different treatment groups. Lastly, we found significant effects of antibiotics and probiotics on the mycobiome but not on the microbiome and resistome of preterm infants.ConclusionsAlthough our analyses showed transient effects, these results provide positive motivation to continue the research on the effects of medical interventions on the microbiome, resistome and mycobiome of preterm infants.

Growth and Neurodevelopmental Outcomes of Preterm Infants Born < 26 Weeks Gestation before and after Implementation of a Nutrition-Care Bundle.

This study aimed to assess the impact of a nutrition-care bundle on growth and neurodevelopmental outcomes of micro-preterm infants born in a level III neonatal intensive care unit (NICU) by two years corrected age. A nutrition-care bundle emphasizing the prompt initiation of parenteral nutrition at birth, initiation of enteral feeds within 6 h after birth, and early addition of human milk fortifiers was implemented in 2015 for infants born < 26 weeks gestation. This before-and-after study evaluated growth and neurodevelopmental outcomes in infants born between 2012-2013 (before-nutrition-bundle, BNB) and 2016-2017 (after-nutrition-bundle, ANB). A total of 145 infants were included in the study. Infants in the ANB group (n = 73) were smaller (birthweight and gestational age), and there were more male infants and multiples included compared to the BNB group (n = 72). Enteral feeds and fortifiers started earlier in the ANB group. Growth velocity and weight z-score changes were similar in both groups during NICU stay and post-discharge. Systemic steroid use, but not cohort, was linked to lower Bayley scores across all domains. Implementing a nutrition-care bundle was not consistently associated with improved weight gain and neurodevelopmental outcomes in the micro-preterm infant population, possibly due to ongoing high-quality nutritional care by the clinical team.

Incidence and Predictors of Bronchopulmonary Dysplasia Development and Severity Among Preterm Infants Born at 32 Weeks of Gestation or Less.

Background As the most common chronic lung disease (CLD) related to premature birth, bronchopulmonary dysplasia (BPD) is associated with long-term lung disease along with cardiovascular and neurodevelopmental disorders. However, data on the incidence and predictors of BPD in Qatar are lacking. Objectives In this study, we aimed to determine the incidence of BPD among infants born at ≤ 32 weeks gestational age (GA) at our neonatal unit, and identify risk factors for the development of BPD and moderate-severe BPD. Methods This was a retrospective observational cohort study conducted at a single site: a level-III neonatal intensive care unit (NICU) in Qatar. We included 1539 neonates born at ≤ 32 weeks of gestation with birth weights of ≤ 1500 grams who were admitted to the NICU between 2017 and 2020. Univariate and multivariate logistic regression analyses were performed to identify potential factors and predictors and their possible associations with the development of BPD and moderate-severe BPD. We also applied BPD classifications to determine the variability in the incidence of BPD in our cohort according to various definitions (2001 National Institute of Child Health and Human Development (NICHD) Diagnostic Criteria, 2016 Revisions of NICHD Criteria, and 2019 Neonatal Research Network Jensen Grading). Results A total of 451 infants (29.3%) had BPD (BPD group) while 1088 (70.7%) did not (non-BPD group), and the overall incidence of BPD was 29.3%. The most relevant risk factors associated with a higher risk of developing BPD identified in the multivariate logistic regression analysis were appropriate weight for gestational age (adjusted OR (aOR) 3.67, 95%CI 2.02-6.67, P < 0.001), presence of patent ductus arteriosus (PDA) (aOR 2.61, 95%CI 1.86-3.66, P < 0.001), late-onset sepsis (aOR 2.16; 95%CI 1.29-3.62; P = 0.003), and use of invasive ventilation (aOR 1.90; 95%CI 1.35-2.69; P < 0.001). The most relevant independent risk factors associated with a higher risk for developing moderate-severe BDP were postnatal steroids (aOR 7.12, 95%CI 3.77-13.44, P < 0.001), use of inhaled nitric oxide (aOR 3.65, 95%CI 1.48-9.01, P = 0.005), use of invasive ventilation (aOR 2.13, 95%CI 1.13-4.00, P = 0.019), late-onset sepsis (aOR 2.07, 95%CI 1.10-3.91, P = 0.025), and male sex (aOR 2.04, 95%CI 1.24-3.36, P = 0.005). The difference in the distribution of BPD severity across the three different definitions of NICHD was significant (P < 0.001). Conclusion The results of this study showed that the incidence of BPD remained high in infants born at ≤ 32 weeks of gestational age and birth weight <1500 g with appropriate weight for gestational age. The presence of PDA at birth or first echocardiography, late-onset sepsis, and use of invasive ventilation were significant risk factors for the incidence of BPD. The identification of risk factors will contribute to the implementation of lung-protective strategies for at-risk infants who may benefit from potential preventive therapy.

Cardiac biomarkers and left ventricular systolic function in former very preterm infants and term controls at preschool age.

Due to improvements in perinatal care, survival rates of preterm infants have improved during the last decades. However, these infants remain at risk of developing cardiovascular sequelae later in life. This study aimed to investigate the cardiac biomarkers and left ventricular systolic function in former preterm infants in comparison with term controls at preschool age. The study included children aged 5-7 years old born below 32 weeks of gestational age. The control group consisted of same-age children born at term. Basic data of study participants were collected using questionnaires and follow-up databases. During the study visit, we recorded anthropometric data and blood pressure readings, determined high-sensitive cardiac troponin T (hs-cTnT) and N-terminal pro-B-type natriuretic peptide (NT-pro-BNP) concentrations, and calculated fractional shortening (FS) and left ventricular mass (LVM). Term-born (n = 25; median gestational age, 40.1 weeks) compared with preterm-born infants (n = 80; median gestational age 29.6 weeks) showed no significant differences in the median concentration of hs-cTnT [median, 3.5 (IQR 3.5; 3.5) vs. 3.5 (3.5; 3.5) ng/L, p = 0.328] and the median concentration of NT-pro-BNP [median, 91.0 (IQR 40.8; 150.3) vs. 87.5 (50.1; 189.5) ng/L, p = 0.087]. FS and LVM/LVMI were not significantly different between the two groups. At preschool age, we observed no significant differences in cardiac biomarkers and left ventricular systolic function in preterm infants. Further studies are warranted to explore the potential of cardiac biomarkers as a prognostic tool for subclinical cardiac alterations after preterm birth.