title: Evaluation of Trichorionic versus Dichorionic Triplet Gestations from 2005 to 2016 in a Large, Referral Maternity Center.
abstract: ObjectiveTo evaluate trends in the proportions and outcomes of dichorionic-triamniotic (DT) compared with trichorionic-triamniotic (TT) triplet gestations.MethodsThis is a retrospective cohort of all triplet gestations identified by first trimester ultrasound at an academic center between 2005 and 2016. Primary outcomes were the change in proportion of DT versus TT triplets over time and the number of fetuses at delivery. Secondary outcomes included differences in mode of conception and maternal/perinatal outcomes by chorionicity.ResultsOf 258 identified triplet pregnancies, 65.5% (n= 169) were TT. The proportion of DT versus TT triplets increased from 2005 to 2016 (p< 0.001). Women with DT triplets were more likely to deliver a singleton (41.4 vs. 11.2%,p< 0.001). Mode of conception was known for 248 women, of whom 93.5% (n= 232) conceived through infertility treatment. Types of infertility treatment differed by chorionicity (p< 0.001), with DT triplets more likely to conceive through in vitro fertilization (88.3 vs. 60.7%). Women with DT delivered earlier than TT triplets (31.0 ± 5.0 vs. 33.1 ± 3.5 weeks;p= 0.03).ConclusionThe proportion of DT triplet gestations increased significantly over time. Women with DT triplets delivered on average 2 weeks earlier than TT triplets. Women with DT triplets were more likely to reduce to a singleton gestation.
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
authors.forename: Danielle A
authors.initials: DA
authors.lastname: Peress
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
authors.forename: Alan M
authors.initials: AM
authors.lastname: Peaceman
authors.affiliation: Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
authors.forename: Lynn M
authors.initials: LM
authors.lastname: Yee
mesh_terms: D000046:Academic Medical Centers; D000328:Adult; D002641:Chicago; D002823:Chorion / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D011256:Pregnancy Outcome; D018607:Pregnancy Reduction, Multifetal / Q000706:statistics & numerical data*; D011261:Pregnancy Trimester, First; D059286:Pregnancy, Triplet; D012017:Referral and Consultation; D012189:Retrospective Studies; D014310:Triplets; D016216:Ultrasonography, Prenatal