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Diagnostic Planes of the Fetal Heart

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The Right Ventricle Short Axis - Great Vessels View

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Learn to assess the right ventricular outflow tract (RVOT) and the relationship between the great vessels. This session covers the acquisition of the short-axis view, a vital plane for detecting pulmonary stenosis and Tetralogy of Fallot (TOF).

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1. What key structures are evaluated in the short-axis view of the right ventricle and great vessels?
Aortic arch and ductal arch Pulmonary valve, right ventricular outflow tract, and main pulmonary artery Left atrium, mitral valve, and left ventricular outflow tract Coronary arteries and aortic valve
2. The short-axis view is particularly useful for assessing which fetal cardiac condition?
Hypoplastic left heart syndrome (HLHS) Tetralogy of Fallot Coarctation of the aorta Atrioventricular septal defect
3. Which Doppler technique is most helpful in evaluating blood flow through the pulmonary valve in this view?
M-mode imaging Grayscale imaging Color Doppler imaging Power Doppler imaging
4. In the short-axis view, an enlarged pulmonary artery compared to the aorta may indicate:
Persistent truncus arteriosus Pulmonary stenosis Transposition of the great arteries (TGA) Patent ductus arteriosus (PDA)
5. In the short-axis view, an abnormal origin of both great arteries from the right ventricle suggests:
Double outlet right ventricle (DORV) Tetralogy of Fallot Aortic stenosis Coarctation of the aorta
6. The Short-Axis View of the RV/Great Vessels is which numbered view in the standard 9-view fetal echo protocol?
3rd 4th 5th 7th
7. In the RV Short-Axis View, which great vessel connects directly with the morphologic right ventricle and is positioned on the right?
Aorta Superior vena cava Pulmonary artery Ductus venosus
8. After exiting the pulmonary valve, how does the pulmonary artery characteristically bifurcate?
Gradual wide-angle bifurcation Right-angle division into the aortic arch Acute-angle bifurcation into RPA and LPA It does not branch in this view
9. What is the expected appearance of a normal pulmonary valve during systole in this view?
Leaflets dome toward the PA lumen Leaflets remain partially visible at mid-lumen Leaflets prolapse back into the RV Leaflets disappear, flattened against the PA walls
10. The "crossover" sign describes the spatial relationship between the PA and aorta. At what angle do their long axes intersect in a normal fetal heart?
45° 60° 120° 90°
11. In the RV Short-Axis View, where is the cross-section of the aorta and its valve cusps correctly located?
Posterior to the pulmonary valve To the right of the pulmonary trunk Adjacent to the ductus arteriosus At the center of the pulmonary artery curvature
12. In a structurally normal fetal heart, what is the spatial relationship between the aortic and pulmonary valve planes?
They lie at almost the same plane The pulmonary valve is significantly more superior The aortic valve is significantly more superior They are offset by 45°
13. How does the right pulmonary artery (RPA) relate to the transverse aorta in the RV Short-Axis View?
RPA runs anterior to the transverse aorta RPA runs parallel alongside the transverse aorta RPA is not identifiable in this view RPA curves behind the cross-section of the transverse aorta
14. In a normal fetus, what is the expected diameter relationship between the aortic root and pulmonary trunk in this view?
PA diameter is significantly larger Aortic diameter is significantly larger PA is twice the aortic diameter They are almost equal