Prenatally diagnosed omphalocele: characteristics associated with adverse neonatal outcomes

Beyond the womb: prenatal MRI's prognostic abilities for morbidity and mortality in neonates with omphaloceles

BACKGROUND

Managing omphaloceles poses challenges in prenatal consultation and perinatal care. We hypothesized that specific fetal MRI findings could predict morbidity and mortality in these patients.

METHODS

We analyzed fetal MRI studies demonstrating omphaloceles from 2006 to 2022 and conducted a retrospective review of medical records. Predictor variables were correlated with outcomes using univariate and multivariate analyses, and Receiver Operating Characteristic (ROC) curves were optimized with Youden's J statistic.

RESULTS

Among 46 omphalocele patients, 89% survived to birth, with an overall mortality rate of 37%. Significant predictors of mortality included stomach/spleen herniation, severe anomalies, omphalocele-associated syndromes, membrane rupture, lower observed/expected total fetal lung volume (O/E TFLV), and increased percentage of liver herniation. The need for deferred repair correlated with liver/stomach herniation and "giant-omphalocele." ROC analysis identified mortality cut points at O/E TFLV < 42% and liver herniation >77%, while deferred repair was indicated at liver herniation >51%.

CONCLUSION

This study identified prenatal MRI findings associated with mortality and deferred repair, aiding in risk prediction and family counseling.

Prenatal Prognosis of Omphalocele Using Magnetic Resonance Imaging Measurement of Fetal Lung Volumes

BACKGROUND

Omphalocele is a congenital midline abdominal wall defect resulting in herniation of viscera into a membrane-covered sac. Pulmonary complications, including pulmonary hypoplasia, pulmonary hypertension, and prolonged respiratory support are a leading cause of neonatal morbidity and mortality.

OBJECTIVE(S)

This study aimed to assess the role of fetal MRI-derived lung volumes and omphalocele defect size as clinical tools to prognosticate postnatal pulmonary morbidity and neonatal mortality in those with a prenatally diagnosed omphalocele (PDO).

STUDY DESIGN

This was a retrospective cohort study of all pregnancies with PDO at our fetal center from 2007-2023. Pregnancies with aneuploidy or concurrent life-limiting fetal anomalies were excluded. Using fetal MRI, observed-to-expected total fetal lung volume (O/E TLV) ratios were determined by a previously published method. The transverse diameter of the abdominal defect was also measured. The O/E TLV ratios and abdominal defect measurements were compared with postnatal outcomes. The primary outcome was death at any time. Secondary outcomes included death in the first 30 days of life or before discharge from birth hospitalization, the requirement of respiratory support with intubation and mechanical ventilation, or development of pulmonary hypertension.

RESULTS

Of 101 pregnancies with a PDO, 54 pregnancies (53.5%) with prenatally diagnosed omphalocele met inclusion criteria. There was a significant increase in the rate of death when compared between the three O/E TLV classifications: 1/36 (2.8%) in the O/E≥50% group, 3/14 (21.4%) in the O/E 25%-49.9% group, and 4/4 (100%) in the O/E<25% group (P<.001). The rate of intubation increased with the severity of O/E TLV classification, with 27.8% in the O/E≥50% group, 64.3% in the O/E 25%-49.9% group, and 100% in the O/E<25% group (P=.003). The rate of pulmonary hypertension was also higher in the O/E 25%-49.9% (50.0%) and the O/E<25% (50.0%) groups compared to the O/E≥50% group (8.3%, P=.002). There was no association between the transverse diameter of the abdominal wall defect and the primary outcome of death (OR=1.08 95% CI=[0.65-1.78], P=.77).

CONCLUSIONS

In our cohort of patients with PDO, O/E TLV<50% is associated with death, need for intubation, prolonged intubation, and pulmonary hypertension. In contrast, omphalocele size demonstrated no prognostic value for these outcomes. The strong association between low fetal lung volume on MRI and poor neonatal outcomes highlights the utility of fetal MRI for estimating postnatal prognosis. Clinicians can utilize fetal lung volumes to direct perinatal counseling and optimize the plan of care.

An analysis of factors affecting survival in prenatally diagnosed omphalocele

OBJECTIVES

To estimate factors affecting survival in prenatally diagnosed omphalocele, factors predicting genetic abnormalities, and association of omphalocele and specific groups of anomalies.

METHODS

A retrospective observational study was performed, analyzing data of all omphalocele cases diagnosed prenatally in the perinatology clinic of a referral center. Demographic data, characteristics of the omphalocele (size, content, associated anomalies), results of genetic testing, pregnancy outcomes and postnatal outcomes were analyzed.

RESULTS

Sixty-nine fetuses with omphalocele were included. The prevalence of omphalocele in livebirth was 0.007 %. Overall survival during the study period was 73.9 %. Twenty-eight (71.7 %) out of 39 cases with associated anomalies who were born live, survived, whereas survival was 85.7 % in the isolated cases. The most common anomaly associated with omphalocele were cardiac defects with 42 %; followed by placental or umbilical cord anomalies (28.9 %), skeletal defects (27.5), genitourinary anomalies (20.2 %), central nervous system (18.8 %) and facial anomalies (7.2 %), respectively. Eighty-five percent of the fetuses had at least one additional anomaly or ultrasound finding. Skeletal abnormalities and staged surgical repair of omphalocele were associated with survival. Associated skeletal anomalies and staged repair significantly increase the risk of postnatal death (OR: 4.6 95 % CI (1.1-19.5) and (OR: 10.3 95 % CI (1.6-63.9), respectively).

CONCLUSIONS

Associated skeletal abnormalities and staged surgical repair are negatively associated with postnatal survival.

Abdominal Wall Defects: A Review of Current Practice Guidelines

The 2 most common congenital abdominal wall defects are gastroschisis and omphalocele. Gastroschisis is a defect in the abdominal wall with exposed abdominal contents. Mortality rates are low but lengths of stay are often prolonged by bowel dysmotility and other intestinal abnormalities in complicated cases. Omphalocele is a defect through the umbilical cord with herniated abdominal contents covered by a sac. It is associated with other genetic abnormalities and other anomalies that can lead to significant morbidity and mortality. Prenatal diagnosis in both conditions allows for improved prenatal consultation and coordinated perinatal care to improve clinical outcomes.

Current Challenges in the Treatment of the Omphalocele—Experience of a Tertiary Center from Romania

Omphalocele is a congenital abdominal wall defect with a constant incidence in recent decades, sometimes representing a real burden for neonatal intensive care units due to prolonged hospitalization and the evolution to death. In our study, we aimed to detect the main risk factors of an unfavorable evolution in the case of omphalocele. Methods: Retrospective cohort study of all neonates with omphalocele treated in our tertiary pediatric hospital during the last three decades; from 158 patients, 139 patients were eligible for the study. We tried to determine the risk of death using logistic regression model. Results: If the neonate develops sepsis, then there is an increased risk (13.03 times) of evolution to death. Similarly, the risk of death is 10.82 times higher in the case of developing acute renal failure, 6.28 times higher in the case of associated abnormalities, 5.54 in the case of developing hemorrhagic disease, and 3.78 in the case of conservative treatment (applied for giant omphalocele or severe chromosomal abnormalities). Prematurity increases by 3.62 times the risk of death. All six independent variables contributed 61.0% to the risk of death. The area under the ROC curve is 0.91, meaning that the diagnostic accuracy of our logistic regression model is very good for predicting the contribution of the six independent variables to the risk of death. Conclusion: Although in the past 30 years we witnessed several improvements in the antenatal diagnosis and management of omphalocele, survival rate remained constant, 47.5% overall. Much effort is still needed to eliminate the risk factors for death in this condition.

Abdominal wall defects

Abdominal wall defects are common congenital anomalies with the most frequent being gastroschisis and omphalocele. Though both are the result of errors during embryologic development of the fetal abdominal wall, gastroschisis and omphalocele represent unique disorders that have different clinical sequelae. Gastroschisis is generally a solitary anomaly with postnatal outcomes related to the underlying integrity of the prolapsed bowel. In contrast, omphalocele is frequently associated with other structural anomalies or genetic syndromes that contribute more to postnatal outcomes than the omphalocele defect itself. Despite their embryological differences, both gastroschisis and omphalocele represent anomalies of fetal development that benefit from multidisciplinary and translational approaches to care, both pre- and postnatally. While definitive management of abdominal wall defects currently remains in the postnatal realm, advancements in prenatal diagnostics and therapies may one day change that. This review focuses on recent advancements, novel techniques, and current controversies related to the prenatal diagnosis and management of gastroschisis and omphalocele.

Omphalocele-What should we tell the prospective parents?

An omphalocele is a congenital defect in the abdominal wall characterized by absent abdominal muscles, fascia, and skin. The characteristic ultrasound appearance includes a midline defect with herniation of abdominal contents into the base of the umbilical cord. Other anatomic abnormalities are seen in approximately 50% of cases, most notably cardiac defects (19%-32%). Approximately, 50% of cases are associated with genetic and multiple malformation syndromes including trisomy 13/18, pentalogy of Cantrell and Beckwith-Wiedemann syndrome. Therefore, a thorough evaluation is recommended, including detailed anatomic survey, fetal echocardiogram, genetic counseling, and prenatal diagnostic testing. Overall prognosis depends on the size of the omphalocele, genetic studies, and associated anomalies. Early prenatal diagnosis remains important in order to provide parental counseling and assist in pregnancy management. Delivery should occur at a tertiary care center. Timing and mode of delivery should be based on standard obstetric indications with cesarean delivery reserved for large omphalocele (>5 cm) or those that involve the fetal liver. Neonatal management involves either primary or staged reduction, both of which can be associated with a prolonged neonatal hospitalization.