title: Preterm birth after mature fetal lung indices: is there any neonatal morbidity?
abstract: OBJECTIVE
  To determine the frequency of immediate morbidities in neonates with evidence of mature fetal lung indices who delivered before 37 weeks gestation.
  
  
  METHODS
  A retrospective analysis was performed on pregnancies resulting in birth at < 37 weeks after mature fetal lung was documented by phosphatidylglycerol, lecithin/sphingomyelin ratio, or TDx-FLM studies. Pregnancies with multifetal gestations, maternal diabetes, or fetal anomalies were excluded.
  
  
  RESULTS
  179 patients were included. Eighty-one (45.3%) neonates did not sustain any morbidity, and 98 (54.7%) neonates sustained one or more morbidities. Compared to neonate without any morbidity, neonates experiencing morbidities were delivered at significantly younger gestation (35.7 ± 1.1 vs. 34.9 ± 1.5 weeks, respectively, p < 0.001) had lower birth- weight (2632.2 ± 475.5 vs. 2395.3 ± 496 g, respectively, p < 0.001), and required longer hospital stay (3.7 ± 2.8 vs. 6.9 ± 7.5 days, p < 0.001). A multivariate regression model was performed to control for the effect of birth-weight, steroid administration, and preterm premature rupture of membrane. An earlier gestational age at delivery was associated with a higher risk of neonatal morbidity. The risk of neonatal morbidity decreased by 40% (OR = 0.60, 95% CI = 0.41-0.88; p = 0.009) for each 1 week increase in gestational age.
  
  
  CONCLUSIONS
  Even in the presence of documented fetal lung maturity, major morbidities--including respiratory distress - may still occur.
authors.affiliation: Department of Obstetrics & Gynecology, Tulane School of Medicine, New Orleans, Louisiana 70112, USA. cdola@tulane.edu
authors.forename: Chi
authors.initials: C
authors.lastname: Dola
authors.forename: Thuc
authors.initials: T
authors.lastname: Tran
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Linhuber
authors.forename: Jill
authors.initials: J
authors.lastname: Cierny
authors.forename: Nathaniel
authors.initials: N
authors.lastname: Denicola
authors.forename: Euming
authors.initials: E
authors.lastname: Chong
authors.forename: Azad
authors.initials: A
authors.lastname: Bhuiyan
mesh_terms: D000328:Adult; D005260:Female; D005325:Fetal Organ Maturity; D006801:Humans; D008168:Lung / Q000196:embryology; D055820:New Orleans / Q000453:epidemiology; D011247:Pregnancy; D047928:Premature Birth / Q000453:epidemiology*; D012189:Retrospective Studies; D055815:Young Adult