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Diagnostic Planes of the Fetal Heart

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The Left Ventricular Outflow Tract View

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Focuses on the detailed evaluation of the left ventricular outflow tract. Students will learn the technique for visualizing the aorta as it exits the heart, which is essential for identifying conditions like aortic stenosis and coarctation of the aorta.

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1. In the standard fetal echo protocol, which position does the LVOT view occupy?
3rd of 9 views 4th of 9 views 5th of 9 views 6th of 9 views
2. As the ascending aorta emerges from the left ventricle, which direction does it initially point?
Leftward, then arches Rightward, then curves into the arch Posteriorly, toward the spine Anteriorly, parallel to the sternum
3. How does the aorta branch to give rise to the neck vessels, and why is this diagnostically significant?
Narrow angle, close to the semilunar valve Wide angle, far from the semilunar valve Right angle, at the level of the valve Parallel branching alongside the pulmonary trunk
4. Septo-aortic continuity describes the direct anatomical connection between which two structures?
Mitral valve and posterior aortic wall Interventricular septum and anterior aortic wall Tricuspid valve and posterior aortic wall IVS and posterior aortic wall
5. During systole, what is the expected appearance of the aortic valve leaflets in a normal LVOT view?
They bow outward into the aortic lumen They remain partially open throughout systole They disappear completely, flattened against the aortic wall They prolapse into the left ventricle
6. What is the expected spatial relationship between the aorta and pulmonary trunk in the LVOT crossover assessment?
They run parallel at 0° They cross at approximately 45° They cross at approximately 90° They cross at approximately 135°
7. How does the size of the normal fetal aorta compare to the pulmonary trunk?
Aorta is significantly larger Aorta is similar in size to, or slightly smaller than, the pulmonary trunk Aorta is always at least 25% smaller Pulmonary trunk is always smaller
8. If the right atrium is visible in your LVOT imaging plane, what does this indicate?
Normal cardiac situs — no action needed An off-axis or incorrectly angulated view Dilated right atrium suggesting tricuspid regurgitation Confirmed correct LVOT plane
9. What is the primary structure evaluated in the LVOT view?
Pulmonary artery Right ventricular outflow tract Aortic valve and ascending aorta Superior vena cava
10. Which congenital anomaly can be identified in the LVOT view?
Coarctation of the aorta Tetralogy of Fallot Transposition of the great arteries (TGA) Interrupted aortic arch
11. Why is proper alignment important in obtaining the LVOT view?
To avoid foreshortening of the pulmonary artery To clearly visualize the interventricular septum and aortic continuity To measure the diameter of the left atrium To assess the coronary arteries
12. Which imaging modality is most useful for assessing blood flow across the aortic valve in the LVOT view?
Grayscale imaging Color Doppler imaging Power Doppler imaging M-mode imaging
13. An abnormality is detected in the LVOT where the aorta arises from the right ventricle instead of the left. This finding suggests:
Hypoplastic left heart syndrome (HLHS) Double outlet right ventricle (DORV) Persistent truncus arteriosus Tetralogy of Fallot