In a newborn, absence of which structure could lead to tricuspid valve atresia?

Tricuspid valve atresia is a congenital heart defect characterized by the absence of a properly formed tricuspid valve, which normally allows blood to flow from the right atrium to the right ventricle. In this condition, the absence of the right ventricle significantly impacts blood flow and circulation.

When the right ventricle is absent or underdeveloped, it cannot accept blood from the right atrium. As a result, blood cannot flow effectively to the lungs for oxygenation. Therefore, the absence of the right ventricle is specifically linked to the development of tricuspid valve atresia. The left side of the heart typically compensates in some cases, leading to potential mixed blood flow and other associated congenital defects.

In this context, understanding the role of the right ventricle is crucial, as its absence directly correlates with the failure of the tricuspid valve's normal function. This illustrates the complex interdependence of heart structures in fetal development and congenital defects.