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Influence of clinical and ventilatory parameters on morphology of bronchopulmonary dysplasia
M Gorenflo1, M Vogel, L Herbst
1Department of Neonatology, Virchow Medical Centre, Free University of Berlin, Germany.
Insights
Bronchopulmonary dysplasia (BPD) in premature infants is linked to oxygen exposure, ventilation, and lung injury. Interstitial lung emphysema and initial barotrauma contribute to lung fibrosis in BPD.
Area of Science:
- Neonatalogy
- Pediatric Pathology
- Pulmonary Medicine
Background:
- Bronchopulmonary dysplasia (BPD) is a chronic lung disease affecting premature infants.
- Multiple factors, including oxygen exposure, mechanical ventilation, and infection, are implicated in BPD development.
- Understanding the morphologic correlates of these factors is crucial for improving BPD outcomes.
Purpose of the Study:
- To investigate the relationship between various clinical factors and specific histopathologic findings in bronchopulmonary dysplasia (BPD).
- To assess the influence of cumulative oxygen dose, barotrauma, prematurity, infection, and persistent ductus arteriosus (PDA) on lung morphology in neonates with BPD.
Main Methods:
- Retrospective analysis of 72 neonates who died from BPD, defined by histopathologic criteria.
- Assessment of clinical data including gestational age, survival duration, ventilation parameters, oxygen exposure, infection, and PDA.
- Semiquantitative scoring of lung autopsy findings (hyaline membranes, necrosis, emphysema, atelectasis, interstitial cell proliferation, fibrosis) and multivariate analysis.
Main Results:
- The study identified "acute" (n=22), "reparative" (n=34), and "healed" (n=16) forms of BPD.
- Interstitial lung emphysema (ILE) within the first week correlated with interstitial cell proliferation and fibrosis in survivors >28 days.
- Initial barotrauma was associated with the development of lung fibrosis in infants with BPD.
Conclusions:
- Morphologic features of BPD are influenced by clinical factors such as oxygen exposure, barotrauma, and infection.
- Early interstitial lung emphysema and barotrauma are significant contributors to lung fibrosis in bronchopulmonary dysplasia.
- Further research into these associations may guide strategies for preventing or mitigating BPD severity.
Abstract:
Our aim was to assess multiple factors which contribute to bronchopulmonary dysplasia (BPD) in prematurely born neonates. Specific morphologic features might relate to cumulative oxygen dose, barotrauma, prematurity, infection, and persistent ductus arteriosus (PDA). Seventy-two patients dying from BPD as defined by the histopathologic criteria of Stocker were analyzed retrospectively. Median (range) gestational age was 28 (25-35) weeks, and median survival was 16 (5-386) days. The infants were ventilated for 15 (15-149) days with a mean inspired oxygen fraction (FiO2) of 0.78. The cumulative oxygen dose and mean airway pressures were determined. The presence of neonatal infection, PDA, and interstitial lung emphysema (ILE) was assessed. Baseline lung disease was estimated as proposed by Palta. At autopsy, the degree of hyaline membranes, epithelial cell necrosis, emphysema, atelectasis, interstitial cell proliferation, and lung fibrosis was scored semiquantitatively (0 to 3+). The influence of neonatal infection, PDA, gestational age, survival, oxygen dose, or barotrauma on morphological findings was examined by multivariate analysis. We found "acute" BPD in 22, "reparative" in 34 and long-standing-"healed" in 16 cases. ILE within the first week was associated with interstitial cell proliferation and lung fibrosis in infants surviving more than 28 days. Initial barotrauma contributes to lung fibrosis in infants with BPD.