PDA Ligation in Preterm Infants: Who Benefits Most?
"Discover how high-frequency ventilation can predict respiratory improvement after PDA ligation, and what this means for babies with severe lung disease."
Patent ductus arteriosus (PDA), a common condition in preterm infants, involves continuous blood shunting that can overwhelm a newborn's delicate respiratory system. When medications fail to close the PDA, surgical ligation becomes a necessary intervention.
However, the decision to ligate is not without controversy. Concerns about potential harm have led to a more selective approach, reserving ligation for extreme cases. Clinicians often weigh the degree of respiratory support an infant needs when considering this procedure.
Now, a new study published in The Journal of Pediatrics sheds light on which infants are most likely to benefit from PDA ligation in terms of respiratory improvement. The research identifies a key predictor and offers insights into optimizing treatment strategies for these vulnerable patients.
A Common Ductal Problem With Unsettled Answers
Patent ductus arteriosus (PDA) is common among extremely preterm infants and can represent a significant hemodynamic problem in this population. Although the rate of surgical ligation has decreased over time, ligation remains a necessary treatment option when the patient has a large, hemodynamically significant ductus that fails medical management. The timing of ligation depends on a variety of factors and may carry meaningful clinical implications for neonatal outcomes. Despite extensive research over decades, a 2025 American Academy of Pediatrics clinical report notes that uncertainty and controversy persist, resulting in substantial variability in clinical approach.
Two Procedural Paths, One Open Question
When medical management fails or is not appropriate, procedural PDA closure in preterm infants can be performed either surgically or via transcatheter techniques. A meta-analysis published in 2023 assessed the safety and efficacy of transcatheter closure compared with surgical ligation for persistent PDA in preterm infants. In 2024, a clinical practice guideline developed using GRADE (Grading of Recommendations Assessment, Development and Evaluation) methodology set out rigorous recommendations on procedural PDA closure. These efforts reflect an ongoing assessment of which approach, and which infants, benefit most from procedural intervention.
Six Decades of a Persistent Debate
For nearly six decades, research involving thousands of infants has produced persistent uncertainty and controversy about the significance, evaluation, and management of PDA in preterm infants, resulting in substantial heterogeneity in clinical practice. Surgical ligation has long been a mainstay of treatment, and national trend analyses have tracked ligation patterns over an 18-year period while evaluating associated mortality and morbidities. More recently, transcatheter PDA closure has been approved for infants weighing at least 700 g and after 3 days of birth, yet surgical ligation may still be required in smaller infants and in ducts not suitable for interventional closure. Together, these milestones illustrate a field that has evolved from a purely surgical approach toward a broader procedural toolkit.
High-Frequency Ventilation: A Key Predictor
Researchers conducted a two-phase study involving preterm infants with a birth weight of less than 1500 grams. The first phase was a retrospective analysis of infants undergoing PDA ligation. The second phase compared these infants to a matched control group, balancing factors like gestational age and pre-ligation respiratory condition.
- The study revealed that infants on high-frequency ventilation (HFV) were significantly more likely to show respiratory improvement after ligation. Specifically, 42% of infants showed respiratory improvement at 7 days, with those on HFV having a much higher chance of improvement.
- The adjusted odds ratio (aOR) for respiratory improvement in infants on HFV was 5.03 (95% CI [1.14-22.18]).
An Evolving, Still-Unsettled Evidence Base
Ongoing research continues to examine which preterm infants with a hemodynamically significant PDA are most likely to benefit from ligation, but findings are still evolving and no definitive consensus has yet emerged. Recent and forthcoming studies are focused on refining patient selection, optimal timing, and the relative merits of surgical versus catheter-based approaches. Because this is an active and rapidly changing area of investigation, current conclusions should be treated as provisional until additional data from ongoing trials and reviews become available.
The Case Against Routine Ligation
Controversy regarding the optimal timing of PDA ligation and the decision to operate persists, even though ligation is commonly considered an urgent procedure in infants who have failed medical therapy. Because PDA can be a significant hemodynamic problem in preterm infants, contributing to increased morbidity and mortality, the operation is often pursued; however, a study published in the Journal of Pediatric Surgery set out to evaluate the outcomes and efficacy of PDA ligation in very low birth weight infants. Reports such as this underscore that expected benefits do not necessarily materialize in every infant, leaving room for scrutiny of when and for whom ligation is genuinely indicated.
Surgical Ligation Versus Catheter Closure
Comparative research directly pits surgical ligation against catheter-based closure in preterm infants. A single-center retrospective cohort of infants born at less than 32 weeks' gestation compared surgical ligation with catheter closure after failure of or contraindication to medical therapy, examining immediate procedural complications and post-procedure physiologic status. A systematic review and meta-analysis found transcatheter closure to be feasible in very premature infants as an alternative to surgical ligation when clinically indicated, while research in the Journal of the American Heart Association asked which are the real benefits of the percutaneous approach in very low-weight preterm infants. Taken together, the evidence indicates both approaches are viable, with their comparative advantages still being debated.
Clinical Implications and Future Directions
These findings suggest that HFV may serve as a marker for identifying infants who could benefit most from PDA ligation. Because HFV is often used as a rescue mode for infants with severe lung disease, the study indicates that those with the most compromised respiratory systems may experience the greatest short-term benefits from ligation.
2025 Guidance in One Coherent Summary
A comprehensive report published in December 2025 (DOI 10.1002/pdi3.70032) addresses the ongoing controversies and uncertainties surrounding PDA management in preterm neonates. It provides evidence-based guidance for clinicians caring for preterm infants and includes a summary table of key updates in the 2025 American Academy of Pediatrics clinical consensus report. As a synthesis of the current evidence, it reflects the field's move toward individualized, evidence-informed decision-making rather than a one-size-fits-all surgical policy.
Toward Sharper Selection and Less Invasive Closure
Looking ahead, the next frontiers in PDA management in preterm infants are likely to center on more precise patient selection, refined timing of intervention, and wider adoption of less invasive closure techniques as technology matures. Ongoing and anticipated research may help clarify which infants genuinely benefit from ligation and which can safely avoid intervention. Because these developments are still evolving, specific projections remain uncertain and should be treated as direction-of-travel rather than settled expectations.
Practice Variation and Structural Barriers
On a broader level, PDA management in preterm infants sits within systemic challenges facing neonatal care, including variation in practice between hospitals and clinicians, resource constraints, and the difficulty of conducting high-quality trials in a vulnerable population. These factors contribute to the controversy and inconsistent care reflected throughout the literature. Addressing them will likely require coordinated guideline efforts, better data infrastructure, and continued research investment so that decision-making can become more standardized and evidence-based.
Seen Through the Families at the Bedside
Behind the clinical debates are very small, fragile infants and their families, for whom decisions about PDA ligation carry real emotional and practical weight. Outcomes such as survival, long-term neurodevelopment, and the stress of urgent surgery shape the lived experience of care in ways that statistics alone cannot capture. Keeping these human stakes at the center of research and clinical conversations remains as important as the technical question of who benefits most.
It's important to note that while ligation may prevent further respiratory deterioration in infants on HFV, it doesn't necessarily guarantee respiratory improvement for all infants, especially those on conventional ventilation. Clinicians should carefully weigh the potential risks and benefits of PDA ligation, considering individual respiratory status and ventilation mode.
Further research is needed to understand the long-term respiratory outcomes and to identify additional predictors of success for PDA ligation in preterm infants. These findings may lead to more targeted and effective treatment strategies, ultimately improving the outcomes for these vulnerable newborns.