Which view is commonly used to evaluate outflow tract alignment and the great vessels in fetal echocardiography?

• A. The apical four-chamber view.
• B. The four-chamber view alone.
• C. The 3-vessel-trachea (3VT) view.
• D. The subcostal long-axis view.

Answer: (C)

Assessing how the outflow tracts and great vessels relate to each other requires a view that places the trachea and the three major vessels in a single plane. The three-vessel-trachea view does exactly this, showing the pulmonary artery, the aorta, and the superior vena cava together with the trachea in the same slice. This arrangement lets you judge their relative positions, courses, and sizes and to detect abnormalities in how the great arteries arise from the ventricles or how they align with the trachea—information essential for identifying conotruncal and arch anomalies.

Other views don’t provide that same comprehensive context. The apical four-chamber view excels at evaluating atrioventricular connections and chamber size, but it doesn’t reveal how the outflow tracts orient themselves or how the great vessels relate to one another. The four-chamber view alone likewise lacks information about the arterial outlets. The subcostal long-axis view can show the outflow tracts, but it doesn’t present the three vessels in relation to the trachea in one clear cross-section, making it less efficient for assessing overall outflow tract alignment.