Objective To compare the association of the severity categories of the 2001-National Institutes of Health (NIH), the 2018-NIH and the 2019-Jensen bronchopulmonary dysplasia (BPD) definitions with neurodevelopmental and respiratory outcomes at 2 and 5 years’ corrected age (CA), and several BPD risk factors. Design Single-centre historical cohort study with retrospective data collection. Setting Infants born between 2009 and 2015 at the Amsterdam University Medical Centers, location Amsterdam Medical Center. Patients Preterm infants born at gestational age (GA) <30 weeks and surviving up to 36 weeks’ postmenstrual age. Interventions Perinatal characteristics, (social) demographics and comorbidities were collected from the electronic patient records. Main outcome measures The primary outcomes were neurodevelopmental impairment (NDI) or late death, and respiratory morbidity at 2 and 5 years’ CA. Using logistic regression and Brier scores, we investigated if the ordinal grade severity is associated with incremental increase of adverse long-term outcomes. Results 584 preterm infants (median GA: 28.1 weeks) were included and classified according to the three BPD definitions. None of the definitions showed a clear ordinal incremental increase of risk for any of the outcomes with increasing severity classification. No significant differences were found between the three BPD definitions (Brier scores 0.169–0.230). Respiratory interventions, but not GA, birth weight or small for GA, showed an ordinal relationship with BPD severity in all three BPD definitions. Conclusion The severity classification of three BPD definitions showed low accuracy of the probability forecast on NDI or late death and respiratory morbidity at 2 and 5 years’ CA, with no differences between the definitions.

Introduction: Preterm infants born before 32 weeks of gestation are generally admitted to a neonatal intensive care unit (NICU) to receive life-saving treatment, resulting in early exposure to stressful events. Yet, NICU admission is not only stressful for the infant but can also have a long-lasting negative impact on parental mental health, who may worry about their child. Parental mental health problems might affect child development through parental behaviour and the parent–infant relationship. Simultaneously, adverse child development after preterm birth can (further) elevate parental stress and mental health problems, straining parental behaviour, the parent–infant relationship and child development. This systematic review and meta-analysis aims to examine the association between preterm-born children’s development (<32 weeks’ gestation) and parental mental health after preterm birth-related stress following NICU admission at any point in time. Methods and analysis: A systematic review will be performed and reported following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. A concept-based search on preterm birth, child development and parental mental health is performed using MEDLINE, Embase, PsycINFO and Cochrane Library on 22 March 2024. Eligible are studies with original results on the association between child development after preterm birth (<32 weeks’ gestation) and parental mental health. Independent reviewers will screen the articles, assess study quality using a Newcastle-Ottawa or Cochrane tool and determine the quality of evidence using Grading of Recommendations, Assessment, Development and Evaluation. Meta-analyses are planned on the association between child development and parental mental health after preterm birth. Ethics and dissemination: No ethical approval is required. The results will enhance knowledge of the association between child development and parental mental health after preterm birth-related stress following NICU admission. This might lead to adjustments in follow-up care, optimising outcomes for infants and parents. Findings will be published in an international, peer-reviewed and open-access journal. PROSPERO registration number: CRD42024518307.

Over 90% of preterm neonates are, often empirically, exposed to antibiotics as a potentially life-saving measure against sepsis. Long-term outcome in association with antibiotic exposure (NABE) has insufficiently been studied after preterm birth. We investigated the association of NABE-duration with early-childhood developmental and health outcomes in preterm-born children and additionally assessed the impact of GA on outcomes. Preterm children (GA < 30 weeks) participating in a multicenter cohort study were approached for follow-up. General expert-reviewed health questionnaires on respiratory, atopic and gastrointestinal symptoms were sent to parents of children > 24 months’ corrected age (CA). Growth and developmental assessments (Bayley Scales of Infant and Toddler Development (BSID) III) were part of standard care assessment at 24 months’ CA. Uni- and multivariate regressions were performed with NABE (per 5 days) and GA (per week) as independent variables. Odds ratios (OR) for health outcomes were adjusted (aOR) for confounders, where appropriate. Of 1079 infants whose parents were approached, 347 (32%) responded at a mean age of 4.6 years (SD 0.9). In children with NABE (97%), NABE duration decreased by 1.6 days (p < 0.001) per week of gestation. Below-average gross-motor development (BSID-III gross-motor score < 8) was associated with duration of NABE (aOR = 1.28; p = 0.04). The aOR for constipation was 0.81 (p = 0.04) per gestational week. Growth was inversely correlated with GA. Respiratory and atopic symptoms were not associated with NABE, nor GA. We observed that prolonged NABE after preterm birth was associated with below-average gross-motor development at 24 months’ CA, while a low GA was associated with lower weight and stature Z-scores and higher odds for constipation.

Objective To report the parent-reported behavioural outcomes of infants included in the Systemic Hydrocortisone To Prevent Bronchopulmonary Dysplasia in preterm infants study at 2 years’ corrected age (CA). Design Randomised placebo-controlled trial. Setting Dutch and Belgian neonatal intensive care units. Patients Infants born <30 weeks’ gestation and/or birth weight 55) were found in 22.9%, 19.1% and 29.4% of infants for total, internalising and externalising problems, respectively; these scores were not significantly different between groups (mean difference −1.52 (95% CI −4.00 to 0.96), −2.40 (95% CI −4.99 to 0.20) and −0.81 (95% CI −3.40 to 1.77), respectively). In the subscales, we found a significantly lower T-score for anxiety problems in the hydrocortisone group (mean difference −1.26, 95% CI −2.41 to –0.12). Conclusion This study found high rates of behaviour problems at 2 years’ CA following very preterm birth, but these problems were not associated with hydrocortisone treatment initiated between 7 and 14 days after birth in ventilated preterm infants. Trial registration number NTR2768; EudraCT 2010-023777-19.