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Scientific Abstracts Presented at the 9th Annual Phoenix Fetal Cardiology Symposium at The Camby Hotel, Phoenix, Arizona, November 2–6, 2018 Sponsored by Phoenix Children’s Hospital Chair, Christopher Lindblade, MD, Co-Directors, Julia Solomon, MD, Anita Moon-Grady, MD, and Norman Silverman, MD Springer Science?Business Media, LLC, part of Springer Nature 2019 Prenatal Diagnosis of Vascular Ring, Sling, and Anomaly of Subclavian Artery Origin Patel Chandrakant, MBBS, Khan Wasim, MD, Smith Brandon, MD, Tracy Christine, MD, Vande Kappelle Peter, MD, Smith Grace, MD Children’s Hospital Medical Center of Akron, Akron, OH, USA Background: The routine use of the four-chamber view and outflow tract views has improved the detection of congenital heart diseases (CHD) by fetal echocardiography (FE). However, abnormalities involving the aortic arch and its branches can be missed. The purpose of this study is to describe the routine use of the three-vessel and trachea view in detecting abnormalities of the aortic arch and its branches with FE. Methods: We performed 8100 FE over our study period from 1/1999 to 8/2018. In addition to standard FE, we routinely use the threevessel and trachea view including subclavian artery (SCA) with color and pulsed Doppler. On axial view of the upper mediastinum, the normal left aortic arch appears as a V-shaped confluence of the ductus arteriosus (DA) and the aortic arch, to the left of trachea. Prenatal diagnoses were confirmed on postnatal echocardiography and other modalities. Results: Twenty-six fetuses were diagnosed with vascular rings at mean gestation age (GA) at diagnosis of 25.3 weeks; 3 with double aortic arch; 18 with right aortic arch (RAA), aberrant left SCA, and left ductus arteriosus; 2 with right circumflex aortic arch and left ductus; 2 with RAA with mirror image branching and left ductus; 1 with left aortic arch with right ductus. There were ten fetuses with CHD and 16 with normal heart. One fetus each was with trisomy 21 and 22q11 microdeletion. There were 53 fetuses with left aortic arch with aberrant right SCA and left DA diagnosed at mean GA of 21 weeks. There were 22 fetuses associated with CHD and 31 with normal hearts. There were six fetuses with trisomy 21 and four with 22q11 microdeletion. There were two fetuses diagnosed with isolation of left SCA with RAA and one with pulmonary artery sling. Conclusion: The three-vessel and trachea view allowed accurate determination of the laterality of the aortic arch and types of vascular rings. The presence of DA prenatally aids in diagnosing vascular rings. This view should be routinely incorporated in detecting abnormalities of the aortic arch and its branches on FE. Assessing the Awareness of Parents Having Children with Congenital Heart Disease About Fetal