Aorta

Introduction:

Many studies have demonstrated the accuracy of bedside ultrasound in detecting abdominal aortic aneurysm. Since the majority of these aneurysms occur distal to the renal arteries, it is imperative that the entire abdominal aorta (down to the aortic bifurcation) is visualized. Measurements should be taken across the widest diameter of aorta, from outer wall to outer wall.

Focused Questions:

1. Is the aorta less than 3cm?
2. Are the iliac arteries less than 1.5cm?

Video Overview:

Required Views:

1. Proximal Aorta (transverse)

Probe position	Image
Notes
Visualize the aorta, inferior vena cava, lumbar shadow The superior mesenteric artery and splenic vein are often seen at this level as well
Abnormal Studies

2. Mid Aorta (transverse)

Probe position	Image
Notes
Visualize the aorta, inferior vena cava, lumbar shadow The renal arteries may sometimes be seen branching from the aorta at this level
Abnormal Studies

3. Aortic bifurcation/iliac arteries (transverse)

Probe position	Image
Notes
Near the level of the umbilicus (L4-5) the aorta bifurcates into the iliac arteries This is best seen using very small fanning motions of the transducer proximal and distal The single circle of the aorta will be seen to divide with very small transducer movements

4. Mid Aorta (longitudinal)

Probe position	Image
Notes
Be sure the aorta, and not the inferior vena cava, is centered on the screen
Abnormal Studies