Preterm vs term delivery in antenatally diagnosed gastroschisis: a systematic review and meta-analysis

To review the evidence regarding gestational age at birth, length of stay, sepsis incidence, days on mechanical ventilation, and mortality between preterm and term deliveries in pregnancies complicated by gastroschisis. We conducted database searches of PubMed, Cochrane Central Register of Controlled Trials, Embase, the World Health Organization International Clinical Trials Registry Platform, and ClinicalTrials.gov without language restrictions through August 16, 2021. References of all relevant articles were reviewed. Randomized controlled trials, nonrandomized controlled trials, and observational studies were evaluated comparing length of stay, sepsis, days on mechanical ventilation, and mortality between either elective preterm delivery and expectant management (Group 1) or preterm gestational age and term gestational age (Group 2). Two researchers independently selected studies and evaluated risk of bias with the Risk of Bias 2 tool for randomized controlled trials and the Newcastle-Ottawa Scale for cohort studies. Mean differences and odds ratios were calculated using a random-effects model for inclusion and methodological quality. The primary outcome was length of stay. Secondary outcomes were incidence of sepsis, mortality, days on mechanical ventilation, and gestational age. Thirty studies with a total of 7409 patients were included in the systematic review, of which 25 were included in the analysis. Group 1 studies found no difference in length of stay or mortality and a trend toward fewer days on mechanical ventilation (mean difference, −0.40; 95% confidence interval, −0.89 to −0.10; P=.12; I2=35%). Subgroup analysis excluding premature delivery demonstrated lower sepsis incidence in elective preterm delivery (odds ratio, 0.46; 95% confidence interval, 0.25–0.84; P=.01; I2=0%). Group 2 studies found increased length of stay (mean difference, 15.44; 95% confidence interval, 8.44–21.83; P