title: Effectiveness of timing strategies for delivery of monochorionic diamniotic twins.
abstract: OBJECTIVE
  The purpose of this study was to compare strategies for delivery timing of uncomplicated monochorionic diamniotic twin pregnancies.
  
  
  METHODS
  A decision tree compared 9 strategies that included scheduled delivery between 32 and 38 weeks' gestation, with or without confirmation of fetal lung maturity. Outcomes in the model included fetal death, infant death, respiratory distress syndrome, mental retardation, and cerebral palsy.
  
  
  RESULTS
  A scheduled delivery at 38 weeks' gestation was the preferred strategy, which resulted in the highest quality adjusted life years under base-case assumptions. Decreased, but comparable, quality adjusted life years estimates resulted from scheduled deliveries at 36 and 37 weeks' gestation, with or without amniocentesis. Sensitivity analyses demonstrated that the optimal gestational age for delivery was always ≥36 weeks' gestation.
  
  
  CONCLUSIONS
  This decision analysis suggests that, for women with uncomplicated monochorionic twins, delivery between 36 and 38 weeks' gestation is the preferred strategy for timing of delivery.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Indiana University School of Medicine, Indianapolis, IN 46202, USA. barrobin@iupui.edu
authors.forename: Barrett K
authors.initials: BK
authors.lastname: Robinson
authors.forename: Russell S
authors.initials: RS
authors.lastname: Miller
authors.forename: Mary E
authors.initials: ME
authors.lastname: D'Alton
authors.forename: William A
authors.initials: WA
authors.lastname: Grobman
mesh_terms: D003661:Decision Support Techniques; D003663:Decision Trees; D036861:Delivery, Obstetric / Q000379:methods*; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008962:Models, Theoretical; D011247:Pregnancy; D011256:Pregnancy Outcome; D059285:Pregnancy, Twin; D019057:Quality-Adjusted Life Years; D013997:Time Factors; D014430:Twins, Monozygotic