WASHINGTON – Congenital diaphragmatic hernia affects many areas of pediatrics. In a trio of posters presented at the Pediatric Academic Societies annual meeting,
Initial ventilation mode shows little impact on NICU outcomes
In one study, K. Taylor Wild, MD, and colleagues investigated whether high-frequency oscillatory ventilation (HFOV) as an initial mode of ventilation in the delivery room improved gas exchange and neonatal ICU (NICU) outcomes in infants with congenital diaphragmatic hernia (CDH), compared with conventional mechanical ventilation (CMV). In 2019, HFOV became standard practice at CHOP.
The researchers reviewed data on infants with severe CDH who were born at CHOP between 2014 and 2022. Of these, 75 were placed on HFOV and 114 on CMV. The mean gestational age at birth in both groups was approximately 38 weeks, and the mean birth weight was approximately 3 kg.
Compared with CMV, use of HFOV in the delivery room was associated with significantly higher pH (7.05 vs. 7.16, P = .03) and significantly lower CO2 (85.2 vs. 64.5, P = .005). However, after adjusting for CDH severity, no significant differences appeared in length of stay and overall survival to discharge. The higher rates of extracorporeal membrane oxygenation (ECMO) use in the HFOV group, compared with the CMV group (48% vs. 29.9%), may reflect more severe disease, the researchers noted.
Prenatal brain immaturity associates with developmental delay
In a second study, Sandy Johng, MD, and colleagues found a significant association between prenatal brain immaturity in babies with CDH and developmental scores at age 12 months and older. The researchers reviewed data from a single-center patient registry for 48 infants for whom prenatal neuroimaging results were available. Based on the imaging, a fetal Total Maturation Score (fTMS) was generated and used as a measure of prenatal brain immaturity.
Results from the Bayley Scales of Infant Development-III (BSID-III) – a composite of cognitive, motor, and language scores – were available for 26 neonates at ages 12 months and under as well as at 12 months and older.
In a linear regression model, the researchers found a significant association between difference in fTMS and BSID-III composite language scores in infants 12 months and older. After adjusting for ECMO treatment, an increase in fTMS of one unit was associated with a 6.5-point increase in language scores at age 12 months and older (P < .01). No significant differences were observed between fTMS difference and language scores in infants under 12 months, or in cognitive or motor scores at any age, the researchers noted. The findings were limited by the small sample size, but the study is the first to show an association between prenatal imaging and neurodevelopmental outcomes for infants with CDH. Results suggest that the risk for neurodevelopmental impairment in this population may start in utero, the researchers concluded.
Antibiotic use stays stable
In a third study, Sabrina Flohr, MPH, and colleagues reviewed antibiotic use among infants with CDH who are at increased risk for infection. In many cases, distinguishing between infection and inherent clinical illness is challenging and may lead to unnecessarily high rates of antibiotic use, the researchers noted.
They reviewed data from 381 infants with CDH born at CHOP between January 2013 and November 2022 who were treated and survived in the NICU. Overall, 97.1% of the newborns received antibiotics for a median of 13 days. Nearly two-thirds (63.5%) received antibiotics in the first 72 hours, and 98.1% received them after 72 hours. Ampicillin and gentamicin were the antibiotics used most often in the first 72 hours (approximately 50% for both). After 72 hours, the most commonly used antibiotics were cefazolin (91.6%), vancomycin (67.7%), and cefepime (65.7%).
The results show that antibiotic use among newborns with CDH did not change significantly over time, and the choices of later antibiotics likely reflect perioperative prophylaxis and broad-spectrum treatment, the researchers noted.
Studies show larger trends
“These are three interesting studies regarding congenital diaphragmatic hernia from a center that does a high volume of repairs,” said Tim Joos, MD, a Seattle-based clinician with a combination internal medicine/pediatrics practice, in an interview.
“Each individual case can be consuming, but it is important to look for an aggregate of cases to see the larger trends in practices and outcomes,” said Dr. Joos, who was not involved in any of the studies.
The findings of the ventilation study surprised Dr. Joos. “Although high-frequency oscillatory ventilation improves initial gas exchange in the delivery room, compared with conventional mechanical ventilation, it was not associated with any larger NICU outcome,” he said. “This surprised me because my intuition would be that the HFOV would lead to less barotrauma and therefore better outcomes with the underformed lungs associated with this disorder.”
The imaging study demonstrates the need for more research on the association between CDH and neurologic outcomes, said Dr. Joos.
“Prenatal neuroimaging that shows delayed maturation with congenital diaphragmatic hernia correlates with lower language scores in early childhood, and suggests that this may be a predictor of neurologic outcome independent of the postnatal course,” he said.
Data from the antibiotics study reflect current trends, said Dr. Joos. “Antibiotics use is extremely common during the postnatal course of CDH and surgical repair,” he said. “The choice of antibiotics mirrors what we see in other neonatal conditions with regard to treatment for possible early neonatal sepsis, postsurgical prophylaxis, and later broad-spectrum empiric coverage,” he noted.
“I look forward to more studies to come out of large-volume centers like CHOP or aggregated results from many centers to help figure out best practices for this rare but very complicated and often devastating malformation,” he said.
The three posters received no outside funding. The researchers had no financial conflicts to disclose. Dr. Joos had no financial conflicts to disclose, but he serves on the Editorial Advisory Board of Pediatric News.