Which view is most useful for visualizing atrioventricular valve anatomy and a common AV junction in suspected AV septal defects?

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The main idea is to see both atrioventricular connections directly. The four-chamber view shows all four cardiac chambers side by side and their inflow tracts, making it possible to assess how the mitral and tricuspid valves insert into the two ventricles and whether there is a single, common AV junction. In suspected AV septal defects, this view reveals the relationship of the AV valves to the septum, the presence and extent of any septal deficiency, and whether a common AV junction or shared valvar orifice exists across both ventricles.

Other views focus on different structures: the three-vessel-trachea view evaluates the great arteries and their alignment but not the detailed AV valve anatomy; the LVOT view concentrates on the left outflow tract and aortic valve, not the AV valve insertions; ductus venosus Doppler assesses fetal hemodynamics rather than cardiac anatomy.