Valve of coronary sinus

Valve of Coronary Sinus

Illustration of the heart, with the valve of the coronary sinus labeled at the bottom right.

The valve of coronary sinus, also known as Thebesian valve, is a fold of endocardium that can be found at the opening of the coronary sinus into the right atrium of the heart. It is named after the German anatomist Adam Christian Thebesius, who first described it in the 18th century.

Structure

The valve of the coronary sinus is a semicircular, fold of thin fibrous tissue, which originates from the left posterior part of the atrioventricular (AV) septum. Its size and shape can vary significantly among individuals. In some cases, it may be absent entirely, while in others it may form a complete flap that can partially or completely cover the coronary sinus opening.

Function

The primary function of the Thebesian valve is to prevent the retrograde flow of blood from the right atrium into the coronary sinus during atrial systole. However, it is not always effective in this role, as it may be absent or insufficient in some individuals.

Clinical significance

The valve of the coronary sinus can have clinical significance in several situations. It may pose challenges during procedures that involve the coronary sinus, such as cardiac resynchronization therapy (CRT) or transcatheter mitral valve repair (TMVR). In some cases, it may need to be surgically modified or removed to allow for these procedures.

See also

• Coronary sinus
• Right atrium
• Adam Christian Thebesius