title: Prenatal detection of pulmonary hypoplasia in fetuses with congenital diaphragmatic hernia: a systematic review and meta-analysis of diagnostic studies.
abstract: BACKGROUND
  Fetuses with congenital diaphragmatic hernia (CDH) are at risk of death from pulmonary hypoplasia at birth.
  
  
  OBJECTIVE
  To determine the value of prenatal imaging parameters for predicting lethal pulmonary hypoplasia in fetuses with CDH.
  
  
  METHODS
  Relevant papers were identified by searching MEDLINE (1966-2008), EMBASE (1988-2008) and the Cochrane Library (2008 issue 3).
  
  
  METHODS
  Selected studies examined diagnostic tests for the prenatal prediction of lethal pulmonary hypoplasia in fetuses with CDH. The primary outcome measure was perinatal survival.
  
  
  RESULTS
  Twenty-one studies fulfilled the entry criteria, of which six examined entirely unique heterogeneous parameters and the remaining 15 examined lung-head ratios (LHR) and/or the presence of liver in the fetal thorax. The strongest association was that of LHR > or = 0.6 compared to <0.6 (OR: 17.02; 95% CI: 2.10-137.89), although more clinically relevant was that of LHR >1.0 (OR: 5.07; 95% CI: 2.94-8.74). The finding of liver in the fetal chest was a poor prognostic feature (survival OR: 0.32; 95% CI: 0.21-0.49).
  
  
  CONCLUSIONS
  In CDH, LHR and the presence of liver in the fetal thorax may be a useful predictive indicator of perinatal survival. Future usage of developing techniques needs careful evaluation prior to usage to guide therapy.
authors.affiliation: Department of Fetal Medicine, Birmingham Women's Foundation NHS Trust, Edgbaston, Birmingham, UK.
authors.forename: Ellen
authors.initials: E
authors.lastname: Knox
authors.forename: David
authors.initials: D
authors.lastname: Lissauer
authors.forename: Khalid
authors.initials: K
authors.lastname: Khan
authors.forename: Mark
authors.initials: M
authors.lastname: Kilby
mesh_terms: D000465:Algorithms; D005260:Female; D005333:Fetus / Q000002:abnormalities; D005865:Gestational Age; D006548:Hernia, Diaphragmatic / Q000150:complications / Q000175:diagnosis*; D065630:Hernias, Diaphragmatic, Congenital; D006801:Humans; D008171:Lung Diseases / Q000150:complications / Q000151:congenital* / Q000175:diagnosis*; D008279:Magnetic Resonance Imaging / Q000706:statistics & numerical data; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000706:statistics & numerical data; D014463:Ultrasonography / Q000706:statistics & numerical data