Valve of inferior vena cava

Valve of Inferior Vena Cava

Diagram of the inferior vena cava.

The Valve of Inferior Vena Cava (also known as Eustachian valve) is a crescent-shaped fold of thin, fibrous tissue located in the right atrium of the heart. It directs the flow of blood from the inferior vena cava (IVC) into the right atrium.

Structure

The Eustachian valve is typically 1-2 cm in length and is located at the junction of the IVC and the right atrium. It is a remnant of the fetal circulatory system, and its size and shape can vary significantly among individuals.

Function

The primary function of the Eustachian valve is to direct the flow of oxygen-depleted blood from the IVC into the right atrium, where it is then pumped into the right ventricle and sent to the lungs for oxygenation.

Clinical significance

In some cases, the Eustachian valve may be unusually large or prominent, which can lead to potential health issues. For example, it may act as a source of cardiac arrhythmias or may interfere with the placement of catheters or other medical devices.

See also

• Inferior vena cava
• Right atrium
• Right ventricle