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The likelihood of placenta previa persistence in twins is dependent on the gestational age at sonographic detection. Only at earlier gestations does the type of previa affect its persistence. As gestational age advances, the likelihood of resolution of placenta previa diminishes regardless of the type noted.

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3.7860.55SD vs 4.0560.79SD, p5.21) and the right iliac vessels (3.1361.07SD vs. 2.9760.83SD, p5.40) ultrasound exams after drinking contrast.Conclusions: This study demonstrated that ingestion of oral radiocontrast did not compromise abdominal ultrasound image quality and thus early administration of oral contrast for certain imaging studies can be utilized to decrease time to disposition and length of stay in the emergency department.Objectives: To evaluate the relationship between sonographic maternal subcutaneous thickness and the ability to adequately visualize anatomic components of the targeted fetal survey in twin gestations.Methods: A prospective observational study in twin pregnancies that received targeted sonography between 18-22 weeks gestation at our institution from 11/2010 to 5/ 2014. For study purposes, we measured the sonographic distance from the maternal skin to the uterine surface just below the umbilicus (subcutaneous thickness). We analyzed visualization of 15 anatomic components: atria of the cerebral ventricles, cerebellum, cisterna magna, midline face, 4-chamber view of the heart, left and right ventricular outflow tracts, spine, ventral wall, umbilical cord vessels, stomach, kidneys, bladder, arms, and legs, according to subcutaneous thickness measurement.Results: Of 190 twin pregnancies, maternal subcutaneous thickness was # 10 mm in 12%, .10 to 20 mm in 45%, .20 to 30 mm in 34%, and . 30 mm in 8%. In both twins, visualization of all 15 anatomic components, as well as at least 11, 13, or 14 components, significantly decreased as maternal subcutaneous thickness increased. As maternal subcutaneous thickness increased the chance of adequately visualizing the four chamber heart, both cardiac ventricular outflow tracts, and mid-line face in both twins.Conclusions: Increasing maternal subcutaneous thickness limits adequate visualization of fetal anatomy during targeted ultrasound examination at 18-22 weeks gestation. With fewer than 70% of patients having at least 14 of 15 components visualized for twin A and 50% for twin B, women with a subcutaneous thickness of . 30 mm may need counseling incorporating these limitations. Adverse Pregnancy Outcomes in Twin Pregnancies Reduced to Singleton Pregnancies and Ongoing Twin PregnanciesObjectives: Multifetal pregnancy reduction has been shown to improve outcomes in triplet and higher order multiple pregnancies. The data for fetal reduction of twin pregnancies is limited. The purpose of this study was to compare adverse pregnancy outcomes in ongoing twin pregnancies compared to twin pregnancies reduced to singletons.Methods: This is a retrospective cohort study of dichorionic-diamniotic twin pregnancies, comparing ongoing twin pregnancies with twin pregnancies reduced to singleton gestations between 11-24 weeks gestation in a single Maternal Fetal Medicine practice over a 9 year period. Adverse pregnancy outcomes .24 weeks were compared with p,0.05 used for significance.Results: 501 ongoing twin pregnancies and 63 twin pregnancies reduced to singleto...