Is vaginal delivery preferable to elective cesarean delivery in fetuses with a known ventral wall defect?

Routine cesarean delivery does not improve the outcome of infants with gastroschisis

BACKGROUND/PURPOSE

The optimal mode of delivery for infants with gastroschisis is controversial. The authors compared the outcomes of infants with gastroschisis born vaginally (VD) or by cesarean section (CS).

METHODS

A retrospective analysis of infants with gastroschisis born between 1990 and 2000 was performed. Assessment included patient demographics, respiratory distress, method of closure, number of surgeries, presence of atresia, feeding parameters, parenteral nutrition days (TPN), time to full feeding (FPO), mortality, and length of stay (LOS). Subgroup analyses were performed for those infants requiring cesarean section for fetal distress. Student's t test/analysis of variance (ANOVA) or chi2/Fisher's Exact tests were used for statistical analysis. Logistic and linear regression analyses were also performed.

RESULTS

One hundred thirteen patients were studied (82 VD and 31 CS). No statistical difference existed between the VD and CS groups for perinatal complications, method of closure, number of surgeries (1.6 each), TPN (40.6 v 46.0 days), FPO (40.4 v 47.1 days), mortality (9.7 v 6.5%) and LOS (53.4 v 61.7 days). CS was associated with increased stenosis (25.8 v 4.9%; P =.003), gastrointestinal dysfunction (25.8 v 11.0%; P =.049), and respiratory distress (16.1 v 3.7%; P =.035). Many of these differences did not persist when infants undergoing CS for fetal distress were excluded from the analysis. However, regression analysis identified CS as an independent risk factor for the development of respiratory distress at birth (odds ratio, 7.11; CI, 1.06 to 47.7), with a trend to increased gastrointestinal dysfunction (odds ratio, 4.35; CI, 0.77 to 24.61).

CONCLUSIONS

The routine use of CS for infants with gastroschisis is not supported by our results because equivalent outcomes were observed with both modes of delivery. CS may be a necessary intervention for fetal distress.

Amniotic fluid inflammatory proteins and digestive compounds profile in fetuses with gastroschisis undergoing amnioexchange

OBJECTIVE

In gastroschisis, an inflammatory process related to the presence of digestive compounds may be involved in intestinal damage. We measured the amniotic fluid concentrations of total protein, ferritin and amylase, lipase, gamma-glutamyl transferase and bile acids before each amnioexchange performed in women whose infants had gastroschisis. We estimated the correlation among total proteins, ferritin and digestive compounds and postnatal outcome.

DESIGN

All women whose infants had gastroschisis in our fetal medicine unit are offered repeated amnioexchange during the third trimester of pregnancy to improve the quality of the exteriorised bowel at birth. Amniotic fluid was sampled at the beginning of each amnioexchange and total proteins, ferritin and digestive compounds were assayed.

SETTING

This study was conducted in the Department of Perinatology of the University Hospital Robert Debré in Paris.

POPULATION

Thirty pregnant women with a gastroschisis affected fetus diagnosed antenatally.

METHODS

The biological results were expressed as multiples of the median with respect to a control population.

MAIN OUTCOME MEASURE

Gestational age at delivery and the outcome of the infants were recorded and correlated with amniotic fluid total proteins, ferritin and digestive compounds.

RESULTS

There was a positive correlation (P < 0.01) between digestive compounds (except amylase at the final amnioexchange) and ferritin on the one hand, and all digestive compounds and total proteins concentration at the final amnioexchange on the other. In addition, among total proteins amylase and lipase, lipase concentrations were related with parameters of short term outcome (P < 0.05).

CONCLUSION

Amniotic total proteins and ferritin are elevated in fetuses presenting with gastroschisis as a consequence of an inflammatory process. Inflammation may be induced by the presence of digestive compounds in the amniotic fluid. The concentrations of which may constitute a marker of short term outcome of the newborn infant.

Gastroschisis: the effect of labor and ruptured membranes on neonatal outcome

OBJECTIVES

The purpose of this study was to examine the relationship between labor and ruptured membranes on the neonatal outcome of infants with gastroschisis.

STUDY DESIGN

We reviewed the outcomes of 60 neonates who were prenatally diagnosed with gastroschisis and who were delivered at the University of North Carolina Hospitals between June 1989 and April 1999.

RESULTS

The mean gestational age at delivery was 36 weeks. Four infants (7%) died in the neonatal period, and 19 infants (32%) had a major morbidity. No significant differences appeared in any of the neonatal outcomes when they were stratified by the presence or absence of labor and presence or absence of ruptured membranes. After being controlled for confounding variables, the risk of neonatal death or major neonatal morbidity because of exposure to either labor or ruptured membranes was no different than the risks caused by no labor or intact membranes, respectively.

CONCLUSION

Labor and ruptured membranes do not appear to be associated with increased neonatal morbidity or mortality rates in neonates with gastroschisis.

Omphalocele: clinical outcomes in cases with normal karyotypes

OBJECTIVE

This study was undertaken to examine neonatal outcomes in karyotypically normal cases of omphalocele with respect to mode of delivery, presence of associated anomalies, presence of extracorporeal liver, and method of abdominal wall closure.

STUDY DESIGN

We reviewed 36 cases of omphalocele with delivery at University of North Carolina Hospitals between 1988 and 2001. Elective terminations and pregnancies resulting in miscarriage before 20 weeks' gestation were excluded.

RESULTS

Perinatal mortality rate was 19%. Rate of composite neonatal morbidity was 25%. Associated major anomalies were present in 11 (31%) cases and were associated with increased neonatal mortality. Cesarean deliveries were performed in 21 (58%) cases and were not associated with increased primary closure rates or decreased neonatal morbidity and mortality. Extracorporeal liver was present in 27 (75%) cases and was associated with decreased rates of primary closure but did not affect neonatal outcome.

CONCLUSION

In cases of ongoing omphalocele, perinatal mortality rates are low in the absence of associated anomalies or genetic defects. Intracorporeal liver was not associated with increased rates of associated anomalies or was it associated with increased neonatal morbidity or mortality.

Prenatal management of gastroschisis: the place of the amnioexchange procedure

Gastroschisis is a malformation of the anterior abdominal wall that consists of a right paraumbilical defect with bowel loops bathed in the amniotic fluid. The survival rate is now greater than 90% and the prognosis relies mainly on morbidity attributable to bowel dysfunction. Recent research has examined gastrointestinal waste present in amniotic fluid that induces bowel toxicity and an inflammatory process. The amnioexchange procedure (changing the amniotic fluid regularly) involves a new therapeutic approach: reducing bowel injuries in the fetuses. This article shows that there is an inflammatory reaction in human gastroschisis and in the authors' model, and that the clinical and biological data plead for the practice of amnioexchange in human beings. A randomized, controlled study is now needed.

Gastroschisis: etiology, diagnosis, delivery options, and care

Gastroschisis, one of the more common congenital abdominal wall defects, results in herniation of fetal abdominal viscera into the amniotic cavity. This article discusses theories about gastroschisis etiology, in utero diagnostic tools, delivery options, and postdelivery care. Included are detailed considerations regarding immediate interventions after delivery to support the infant's thermal and fluid management needs and to protect the exposed bowel. Surgical options and postoperative care issues and complications are reviewed, as are respiratory distress and vena cava compression from increased abdominal pressure, nutritional support, and interventions related to the prevention of infection. Giving birth to an infant with gastroschisis is an upsetting experience for parents. Evidence suggests, however, that with today's advances in neonatal care and nutrition and with meticulous attention, the survival rate for infants born with gastroschisis can be excellent.

Using administrative data to identify indications for elective primary cesarean delivery

OBJECTIVE

To develop a methodology to identify indications and normative rates for elective primary cesarean delivery using administrative data.

DATA SOURCES/STUDY SETTING

All delivery discharges in 1995, as reported to the California Office of Statewide Health Planning and Development (secondary data).

STUDY DESIGN

Retrospective population based study.

DATA COLLECTION/EXTRACTION

Data were entered into a recursive partitioning algorithm to develop a hierarchy of conditions by which patients with multiple conditions could be sorted with respect to the binary outcome of labor or elective primary cesarean without labor. This hierarchy was examined for its clinical consistency, validated on a second sample, and compared with results obtained from logistic regression.

PRINCIPAL FINDINGS

Four percent (19,664) of delivery discharges in 1995 underwent elective primary cesarean. Twelve clinical conditions contributed to the hierarchy, and accounted for 92.9 percent of all women experiencing elective primary cesarean delivery. The remaining 7.1 percent of the elective primary cesarean cases were classified as "unspecified."

CONCLUSIONS

A standardized methodology (utilizing recursive partitioning algorithms) for assigning indications for elective primary cesarean is presented. This methodology relies on administrative data, classifies women with complex comorbidity patterns into clinically relevant subpopulations, and can be used to establish normative rates for benchmarking specific indications for cesarean delivery.

Esophageal ligature in experimental gastroschisis

BACKGROUND/PURPOSE

Recently, the authors have shown that in human fetuses suffering from gastroschisis, there is an amniotic fluid inflammatory response and that amniotic fluid exchange designed to disrupt the inflammatory loop seems to have a favorable impact on outcome. The authors, therefore, designed in the fetal sheep a model of gastroschisis in which amnioinfusion significantly improved the deleterious process. They hypothesized that regurgitation and presence of digestive enzyme in the amniotic fluid triggers and maintains the process of inflammation.

METHODS

To test this hypothesis, the authors used their model of gastroschisis in the fetal lamb combined with esophageal ligation and compared it with gastroschisis with or without amnioinfusion.

RESULTS

Of 34 fetuses operated on at midgestation (days 70 through 80), 11 died in utero or were stillborn, 8 had gastroschisis and amnioinfusion, 8 had gastroschisis and no amnioinfusion, and 7 had gastroschisis and esophageal ligation. There were 9 control fetuses. Fetuses were killed at day 145 by cesarean section. Extraabdominal bowels with fibrous peel were processed for histologic examination. Thickness of bowel muscularis (micrometers) was 82.7 +/- 19 for controls, 159 +/- 56 for the nonamnioinfused fetuses, 126 +/- 21 for the amnioinfused fetuses (P =.001), and 240 +/- 225.8 for fetuses with esophageal ligature combined with gastroschisis. The same results were obtained for thickness of serous fibrosis and plasma cell infiltration. Assay of amniotic fluid ferritin, lipase, and protein showed that only amnioinfusion lowered ferritin and protein to levels similar to those of controls, thus, illustrating its preventive effect on inflammation and that esophageal ligature did not prevent digestive enzyme presence in the amniotic fluid.

CONCLUSION

In this model of gastroschisis in the fetal sheep, ligature of the esophagus, which was supposed to protect the extruded bowel by preventing oral regurgitation of digestive enzymes and by creating a relative hydramnios, did not improve the inflammatory and deleterious process, which is best prevented by amnioinfusion.

Abdominal wall defects

Survival for newborns with congenital abdominal wall defects (primarily omphalocele and gastroschisis) has improved, but controversy remains regarding etiology, anatomy and embryology, the role of prenatal diagnosis and mode of delivery, and initial management. A number of recent studies have added to our knowledge and understanding of several of these topics, while several others have raised questions regarding traditional initial management of these infants. Continued improvement in the survival of these infants can be anticipated with further understanding of the in utero and antepartum diagnosis and management of infants with these common congenital abnormalities.