Gentle Breathing First? Evidence Review Tests Intubation Rule for Mild Diaphragmatic Hernia

For decades, one of the most firmly entrenched rules in neonatal medicine has been that every baby born with a congenital diaphragmatic hernia must be intubated immediately. The reasoning is anatomical and unforgiving: in this condition, a hole in the diaphragm allows abdominal organs to migrate into the chest, compressing the lungs and preventing them from expanding properly. Placing a breathing tube and taking over ventilation directly is meant to protect those fragile lungs from the catastrophic consequences of a baby gasping and swallowing air into intestines lodged inside the thorax. Now, a systematic review published in BMC Pediatrics by researchers at Hospital Internacional de Colombia and Fundación Cardiovascular de Colombia has examined whether that rule can safely be relaxed for a carefully selected subgroup of newborns whose prenatal scans predicted a mild form of the disease.

The study, led by Jorge Luis Alvarado-Socarras together with Delia Edith Theurel-Martin and Edgar Fabián Manrique-Hernández, set out to answer a deceptively simple question: what happens when babies with prenatally predicted mild congenital diaphragmatic hernia are allowed to breathe spontaneously at birth, with intubation reserved only for those who deteriorate? The idea behind this so-called spontaneous breathing approach is not reckless. Advances in prenatal imaging now allow specialists to estimate, before delivery, how severe the lung compression is likely to be, using measures such as the lung-to-head ratio and the position of the liver. Babies whose findings fall into the mildest category might, in theory, manage without immediate mechanical ventilation, avoiding the potential harms of unnecessary tubes, sedation, and ventilator-induced lung injury.

To test what the existing literature actually supports, the team searched five major databases: PubMed/MEDLINE, Embase, Scopus, LILACS, and SciELO, covering the entire period from the inception of each database. The initial search was performed on November 27, 2024, and was subsequently updated through August 8, 2026. Two reviewers independently screened the records, a standard safeguard against selection bias, and the risk of bias in each included study was assessed according to its design. The certainty of the body of evidence was then graded using GRADE, the widely used framework that rates confidence in findings from high to very low. Because the available studies differed so much clinically and methodologically, the authors chose a narrative synthesis rather than pooling numbers into a single statistical estimate, a decision that reflects the fragmented nature of the evidence base.

What emerged from that search was strikingly thin. Only three observational studies qualified for inclusion, and together they described just 30 neonates who were initially managed with a spontaneous breathing approach rather than routine intubation. That is an extraordinarily small foundation for a question that touches the opening minutes of life for hundreds of babies each year. Observational studies, moreover, cannot randomize treatment; they simply report what happened in the centers that chose to try the gentler strategy, which means that selection of which babies received it may have been influenced by factors the studies did not fully capture.

The headline numbers from the review are sobering for advocates of selective intubation. Of the 30 neonates managed initially on spontaneous breathing, 16, or 53.3 percent, required unplanned intubation before surgery because of respiratory deterioration. The remaining 14 babies, 46.7 percent, avoided an unplanned pre-operative intubation and presumably proceeded toward surgical repair without the tube that guidelines would have placed at birth. In other words, in the pooled experience of these three studies, slightly more than half of the babies selected for the gentler approach ended up needing urgent intubation anyway, precisely the outcome the routine-intubation policy is designed to prevent or at least anticipate in a controlled manner.

On the question of survival, the picture is more encouraging but far from definitive. No deaths were reported in the included cohorts, which is a genuinely reassuring signal for a condition that remains one of the most challenging in neonatal intensive care. However, the authors flag an important caveat: in one of the studies, subgroup-specific survival to discharge could not be independently confirmed because the denominator reporting was incomplete. Without knowing exactly how many babies were in the spontaneous breathing subgroup, readers cannot verify what proportion survived. Adverse events and the use of extracorporeal membrane oxygenation, the heart-lung bypass technology reserved for the most severe cases, were uncommon across the included studies, but the authors are explicit that reporting limitations preclude definitive conclusions about safety or survival.

These nuances matter because the stakes of getting the decision wrong are asymmetric. A baby who is intubated unnecessarily may be exposed to complications of airway instrumentation and ventilation, but those risks are generally manageable in an experienced neonatal intensive care unit. A baby who is left breathing spontaneously and then deteriorates rapidly faces a race against time, with a compressed lung that may collapse further as swallowed air distends the herniated bowel. The physiological logic of immediate intubation is that it converts an unpredictable emergency into a controlled procedure performed by a prepared team, often in the delivery room, before the baby’s condition can spiral. The review’s finding that more than half of the selected babies deteriorated underscores how difficult it remains to predict, even with modern prenatal imaging, which newborns will truly tolerate spontaneous breathing.

The certainty assessment by GRADE delivers the review’s central verdict: the available evidence on spontaneous breathing in prenatally predicted mild congenital diaphragmatic hernia is of very low certainty and is insufficient to establish safety or effectiveness relative to routine intubation. Very low certainty means that the true effect could be substantially different from what these small observational studies suggest, and that any future evidence could easily change the conclusion. Three studies and 30 babies, drawn from centers that self-selected into trying the approach, simply cannot carry the weight of overturning a guideline that has protected newborns for generations. The authors are unambiguous in their conclusion: given the substantial heterogeneity and small sample sizes, routine intubation remains the standard of care.

That conclusion does not render the review pointless. On the contrary, it performs a valuable service by mapping the boundaries of current knowledge and exposing how little high-quality evidence underpins any attempt to individualize delivery-room management for this condition. The authors call for further prospective, standardized research before any clinical recommendation can be made, and the shape of that research is fairly clear from their analysis. A well-designed prospective study would need to define in advance which prenatal criteria qualify a baby as mild, standardize the criteria for rescue intubation, and follow outcomes with complete denominator reporting so that survival and complication rates can be calculated without ambiguity. Ideally, such work would be multicenter, because a condition as uncommon as congenital diaphragmatic hernia means that any single unit would need years to accumulate a meaningful number of patients.

For clinicians and expectant parents navigating a prenatal diagnosis today, the practical message is continuity rather than change. Prenatal imaging can identify babies likely to have mild disease, and that information is valuable for counseling, delivery planning, and ensuring that surgery and extracorporeal support are available if needed. But the delivery-room default should remain immediate endotracheal intubation, because the alternative has not been shown to be safe and, in the small published experience, led to urgent intubation in a majority of cases. The review also highlights a broader lesson for neonatology: practices that feel intuitively gentler, including non-invasive ventilation and spontaneous breathing strategies that have transformed care in other contexts such as preterm respiratory distress, cannot simply be transplanted to a condition with unique anatomy without rigorous testing. Until such testing is done, the tube goes in first, and the science of when it can safely wait remains an open question that the next generation of studies will need to answer.

Subject of Research: Non-routine intubation versus spontaneous breathing at birth in neonates with prenatally diagnosed mild congenital diaphragmatic hernia

Article Title: Non-routine intubation in prenatally diagnosed neonates with mild congenital diaphragmatic hernia: a systematic review

Article References: Alvarado-Socarras, J. L., Theurel-Martin, D. E., & Manrique-Hernández, E. F. (2026). Non-routine intubation in prenatally diagnosed neonates with mild congenital diaphragmatic hernia: a systematic review. BMC Pediatrics. https://doi.org/10.1186/s12887-026-07800-8

Image Credits: AI Generated

DOI: 10.1186/s12887-026-07800-8

Keywords: congenital diaphragmatic hernia, prenatal diagnosis, neonatal intubation, spontaneous breathing approach, systematic review, neonatology, ventilation, non-invasive ventilation, GRADE certainty of evidence, neonatal outcomes, delivery room stabilization, BMC Pediatrics