The Vieussens valve of the coronary sinus is a prominent valve at the end of the

great cardiac vein The great cardiac vein (left coronary vein) begins at the apex of the heart and ascends along the anterior longitudinal sulcus to the base of the ventricles. It then curves around the left margin of the heart to reach the posterior surface. It m ...

, marking the commencement of the

coronary sinus In anatomy, the coronary sinus () is a collection of veins joined together to form a large vessel that collects blood from the heart muscle ( myocardium). It delivers deoxygenated blood to the right atrium, as do the superior and inferior ven ...

. It is often a flimsy valve composed of one to three leaflets. It is present in 80-90% of individuals. It serves as an anatomical landmark. It is clinically important because it is often an obstruction to

catheter In medicine, a catheter (/ˈkæθətər/) is a thin tube made from medical grade materials serving a broad range of functions. Catheters are medical devices that can be inserted in the body to treat diseases or perform a surgical procedure. Cath ...

s in 20% of patients.Strohmer B (September 2008). "Valve of Vieussens: an obstacle for left ventricular lead placement". ''Can J Cardiol'' 24 (9): e63. . .

References

Valves Anatomy {{anatomy-stub