Tricuspid atresia is a rare congenital heart defect that affects the flow of blood to the heart. It occurs when the tricuspid valve fails to form correctly during fetal development, resulting in a blocked or missing valve. Other terms that are commonly used to describe this condition include tricuspid valve agenesis or hypoplastic right heart syndrome. Additionally, some medical professionals may refer to tricuspid atresia as a type of single ventricle defect, meaning that the heart only has one functioning pumping chamber. Regardless of the terminology used, tricuspid atresia is a complex and serious condition that requires careful monitoring and management throughout the patient's lifetime.