The value of outflow tract flow tracing in early pregnancy in the screening of structural malformations of fetal cardiac great arteries.

Background: To explore the application value of outflow tract "" blood flow in screening fetal cardiac macrovascular structural malformations in early pregnancy.

Methods: A total of 3,356 pregnant women who underwent nuchal translucency (NT) screening during early pregnancy in the prenatal diagnosis center of General Hospital of Ningxia Medical University from January 2017 to December 2018 were taken as the research objects, and the fetuses were systematically screened by ultrasound. The display of four chamber cardiac blood flow, X-shaped blood flow of main pulmonary artery, V-shaped blood flow of three vessel trachea and "" shaped blood flow of outflow tract were observed and recorded.