title: Timing of and outcomes after selective termination of anomalous fetuses in dichorionic twin pregnancies.
abstract: OBJECTIVE
  The objective of this article is to determine if selective termination (ST) of an anomalous dichorionic twin at early gestational age (GA) is associated with a decreased risk of fetal loss and prematurity.
  
  
  METHODS
  All patients who had ST for dichorionic twin pregnancies from 2004 through 2010 at Mount Sinai Medical Center were included. Data were collected via chart review and patient interview. Two case-control analyses were carried out: first, cases were nonviable deliveries, and controls were live births; and second, cases were live births <37 weeks' GA, and controls were live births ≥37 weeks' GA. Univariable and then multivariable analyses identified characteristics associated with pregnancy loss and prematurity.
  
  
  RESULTS
  Among 80 participants, there were four (5%) fetal losses and 15 (19%) premature births. GA at ST was the only characteristic associated with pregnancy loss in multivariable exact logistic regression [OR = 1.43, 95% CI (1.03, 2.26), P = 0.03]. GA at ST was the only characteristic associated with premature delivery in multivariable exact logistic regression [OR = 1.18, 95% CI (1.02, 1.37), P = 0.03].
  
  
  CONCLUSIONS
  This study suggests that ST performed earlier in pregnancy is associated with decreased fetal loss and prematurity.
authors.affiliation: Department of Obstetrics, Gynecology and Reproductive Science, Division of Maternal Fetal Medicine, Icahn School of Medicine at Mount Sinai, New York, NY, USA; Department of Obstetrics and Gynecology, Brigham and Women's Hospital, Boston, MA, USA.
authors.forename: Catherine A
authors.initials: CA
authors.lastname: Bigelow
authors.forename: Stephanie H
authors.initials: SH
authors.lastname: Factor
authors.forename: Erin
authors.initials: E
authors.lastname: Moshier
authors.forename: Angela
authors.initials: A
authors.lastname: Bianco
authors.forename: Keith A
authors.initials: KA
authors.lastname: Eddleman
authors.forename: Joanne L
authors.initials: JL
authors.lastname: Stone
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D005313:Fetal Death / Q000517:prevention & control*; D005865:Gestational Age; D006801:Humans; D008875:Middle Aged; D011247:Pregnancy; D018607:Pregnancy Reduction, Multifetal; D059285:Pregnancy, Twin; D047928:Premature Birth / Q000517:prevention & control*