Aortic arch
![aortic arch aortic arch](https://healthiack.com/wp-content/uploads/Pictures-of-Aortic-Arch-460.jpg)
The ductal arch and basal short-axis views ( Figs. As with other right-left ratios in the fetal heart, the main pulmonary artery should be equal in size to, or more commonly slightly larger than, the aortic root. The use of a sweep, from left ventricular outflow tract (LVOT) to RVOT, and a three-vessel tracheal view can be a powerful way to rule out TGA, far preferred over separate views of each individual outflow tract. 25.5) and the main pulmonary artery should point to the left of the spine (see Fig.
![aortic arch aortic arch](http://cdn.amegroups.cn/journals/amepc/files/journals/2/articles/17591/public/17591-PB4-2766-R1.png)
In general the aortic root should point to the right of the spine (see Fig. This crossing can be seen either with transverse imaging (slight anterior/superior angulation from the 4CV to left ventricular long-axis view to RVOT crossing view see Video 25.2 ) or with sagittal imaging (slight leftward angulation from sagittal aortic arch view to ductal arch view Video 25.8). Demonstration of great-artery crossing represents an important finding on the normal fetal echocardiogram. The ascending aorta (aortic root) and main pulmonary artery should arise from the left and right ventricles, respectively, and then cross at an angle of roughly 45 to 90 degrees. Robert Resnik MD, in Creasy and Resnik's Maternal-Fetal Medicine: Principles and Practice, 2019 Great Arteries and Ductal and Aortic Arches