Going into detail on what this term means and how it relates to health guidelines. This article may be incomplete.
The Eustachian valve, or valve of the inferior vena cava, is a small flap-like structure located within the right atrium of the heart. It is a remnant of a fetal structure that aids in the proper circulation of blood while in utero. The Eustachian valve can sometimes be visualized during medical imaging studies, such as echocardiograms.
Although once thought to have functional significance in fetal circulation, the Eustachian valve is considered a vestigial structure in adults and typically does not play a significant role in heart function postnatally. In some cases, an enlarged Eustachian valve may be associated with certain cardiac conditions, such as atrial septal defects, and may be mentioned during the evaluation of cardiac anatomy.
Overall, the Eustachian valve is a small anatomical feature within the heart that is primarily of developmental and historical interest rather than having a significant impact on adult cardiovascular health.