title: Predicting fetal lung maturity using the fetal pulmonary artery Doppler wave acceleration/ejection time ratio.
abstract: OBJECTIVE
  To determine whether the acceleration/ejection time ratio of the fetal main pulmonary artery Doppler waveform (PATET) can accurately predict the results of fetal lung maturity testing in amniotic fluid.
  
  
  METHODS
  We prospectively studied pregnant women attending our ultrasound unit for clinically indicated fetal lung maturity testing. An ultrasound examination that included measurement of the PATET was performed before the results of the amniocentesis were reported. The results of the PATET and the surfactant/albumin ratio were compared, and a receiver operating characteristic curve was used to determine the PATET cutoff with the optimal sensitivity and specificity for predicting surfactant/albumin ratio results. p < 0.05 was considered statistically significant.
  
  
  RESULTS
  Forty-three patients were included in this study. The receiver operating characteristic curve demonstrated that a PATET cutoff of 0.3149 provided a specificity of 93% (95% CI 77-98%), a sensitivity of 73% (95% CI 48-89%), a negative predictive value of 87% (95% CI 70-95%), and a positive predictive value of 85% (95% CI 58-96%) for predicting immature surfactant/albumin ratio results.
  
  
  CONCLUSIONS
  The PATET may provide a noninvasive means of determining fetal lung maturity with acceptable levels of sensitivity, specificity, and predictive values.
authors.affiliation: Department of Obstetrics and Gynecology, University of Tennessee Health Science Center, Memphis, Tenn., USA.
authors.forename: Mauro H
authors.initials: MH
authors.lastname: Schenone
authors.forename: Jacques E
authors.initials: JE
authors.lastname: Samson
authors.forename: Laura
authors.initials: L
authors.lastname: Jenkins
authors.forename: Anju
authors.initials: A
authors.lastname: Suhag
authors.forename: Giancarlo
authors.initials: G
authors.lastname: Mari
mesh_terms: D000328:Adult; D005260:Female; D005325:Fetal Organ Maturity; D006801:Humans; D008168:Lung / Q000196:embryology*; D011237:Predictive Value of Tests; D011247:Pregnancy; D011446:Prospective Studies; D011651:Pulmonary Artery / Q000000981:diagnostic imaging* / Q000502:physiology; D018608:Ultrasonography, Doppler; D016216:Ultrasonography, Prenatal; D055815:Young Adult