title: Umbilical arterial systolic/diastolic values in normal twin gestation.
abstract: Linear regression analysis was used to describe the relationship of umbilical arterial systolic/diastolic values to gestational age in 65 twin gestations. This relationship (y = 6.18 - 0.11x) was then compared with a previously described regression for singleton pregnancies using a multiple regression model. This comparison revealed that the relationship between the systolic/diastolic ratio and gestational age is the same in singleton and twin gestations.
authors.affiliation: Department of Obstetrics and Gynecology, Pennsylvania Hospital, Philadelphia.
authors.forename: A
authors.initials: A
authors.lastname: Gerson
authors.forename: A
authors.initials: A
authors.lastname: Johnson
authors.forename: D
authors.initials: D
authors.lastname: Wallace
authors.forename: J
authors.initials: J
authors.lastname: Bottalico
authors.forename: S
authors.initials: S
authors.lastname: Weiner
authors.forename: R
authors.initials: R
authors.lastname: Bolognese
mesh_terms: D003971:Diastole; D005314:Embryonic and Fetal Development; D005260:Female; D005865:Gestational Age; D006801:Humans; D009200:Myocardial Contraction; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011446:Prospective Studies; D012016:Reference Values; D012044:Regression Analysis; D013599:Systole; D014427:Twins; D014463:Ultrasonography; D014469:Umbilical Arteries / Q000502:physiology*