Bronchopulmonary dysplasia, or BPD, remains one of the most persistent complications facing extremely premature infants, and a new study is examining a question that has challenged neonatology for decades: is the risk linked mainly to whether a baby is intubated, or to how much respiratory support the baby ultimately requires? The distinction could reshape how clinicians interpret the effects of mechanical ventilation in the neonatal intensive care unit and how researchers investigate the origins of chronic lung disease after premature birth.
Published in the Journal of Perinatology, the study by Richard I. Clyman, Nicole K. Hills, Elizabeth E. Rogers and colleagues focuses on the relationship between invasive modes of ventilation, the magnitude of respiratory support and the incidence of BPD. Its stated objective is to determine whether the intensity of respiratory assistance mediates the association between intubation or invasive ventilation and the development of BPD. In other words, the researchers are asking whether invasive ventilation itself is the primary driver of risk, or whether it serves as a marker for the severity and duration of respiratory illness.
BPD is a chronic lung disorder diagnosed most often in infants born very prematurely. Their lungs are still developing, with fewer and smaller air sacs, immature blood vessels and limited structural support for efficient gas exchange. After birth, many require supplemental oxygen, continuous positive airway pressure or mechanical ventilation. These treatments can be lifesaving, but prolonged exposure to elevated airway pressures and high oxygen concentrations may interact with the fragile biology of the premature lung. The result can be disrupted alveolar development, inflammation and long-term vulnerability to respiratory problems.
The central challenge is that the need for invasive ventilation is rarely random. Infants who are intubated may be smaller, less mature or more severely ill than infants managed with noninvasive support. They may also have respiratory distress syndrome, infection, poor lung compliance or other conditions that independently increase the likelihood of BPD. This creates a major problem known as confounding: an apparent relationship between ventilation and BPD may partly reflect the underlying illness that led clinicians to initiate ventilation in the first place.
The study’s focus on the “magnitude” of respiratory support addresses this problem by moving beyond a simple yes-or-no classification of intubation. Respiratory support can vary substantially in pressure, oxygen concentration, duration and mode. A patient briefly intubated for stabilization may have a very different exposure profile from an infant who requires high ventilator pressures and substantial oxygen for weeks. By examining the scale of support, researchers can explore whether progressively greater respiratory assistance is associated with progressively greater BPD risk.
This framework is closely related to mediation analysis, a statistical approach used to investigate how one factor may influence an outcome through an intermediate variable. In this case, invasive ventilation may be considered an exposure, BPD the outcome and the intensity of respiratory support a potential mediator. If the association between intubation and BPD becomes weaker after accounting for respiratory-support intensity, that would suggest that the amount of support explains at least part of the relationship. If the association remains strong, invasive ventilation itself, or other factors closely linked to it, may play a more independent role.
The distinction has practical implications for neonatal care. Mechanical ventilation cannot simply be avoided when an infant cannot breathe effectively or maintain adequate oxygen levels. However, if the duration and intensity of support are more important than intubation alone, treatment strategies could increasingly emphasize minimizing pressure and oxygen exposure while maintaining safe gas exchange. Such strategies may include early use of noninvasive respiratory support, carefully calibrated ventilator settings, rapid reassessment of readiness for extubation and individualized oxygen targets. These approaches must balance the danger of lung injury against the equally serious risks of inadequate ventilation and oxygen delivery.
The findings are also important for how BPD studies are designed and interpreted. A research analysis that labels infants only according to whether they were ever intubated may overlook major differences in exposure. Conversely, focusing only on the highest level of support could obscure the effects of cumulative exposure over time. The study’s objective highlights the need for detailed clinical data, including ventilation mode, airway pressures, oxygen requirements and duration of treatment. Because BPD definitions and respiratory practices have changed over time, interpreting associations will also require attention to gestational age, birth weight, infection, fluid management and other clinical factors.
The paper does not, in the information provided, report specific numerical results or a final estimate of how much respiratory-support intensity contributes to BPD risk. Its importance lies in addressing a causal question at the heart of premature infant care: whether invasive ventilation should be viewed primarily as a harmful exposure, a signal of pre-existing lung disease, or part of a more complicated chain in which illness leads to greater support and greater support contributes to injury. Clarifying that chain could help clinicians provide respiratory assistance that is both more precise and less damaging, while giving families and researchers a clearer understanding of why BPD develops in some premature infants but not others.
Subject of Research: The relationship between invasive ventilation, the magnitude of respiratory support and the incidence of bronchopulmonary dysplasia in premature infants.
Article Title: Bronchopulmonary dysplasia: its relationship to invasive modes of ventilation and the magnitude of respiratory support
Article References: Clyman, R.I., Hills, N.K., Rogers, E.E. et al. “Bronchopulmonary dysplasia: its relationship to invasive modes of ventilation and the magnitude of respiratory support.” Journal of Perinatology (2026). https://doi.org/10.1038/s41372-026-02852-1
Image Credits: AI Generated
DOI: 10.1038/s41372-026-02852-1
Keywords: bronchopulmonary dysplasia, premature infants, invasive ventilation, mechanical ventilation, respiratory support, neonatal intensive care, prematurity, lung injury, mediation analysis
