The valve of the coronary sinus (Thebesian valve) is a thin semicircular fold guarding the opening of the coronary sinus into the right atrium. It is often incomplete or perforated.
| Location | At the opening of the coronary sinus in the right atrium, between the inferior vena cava opening and the tricuspid valve |
|---|---|
| Parts |
|
| Nerve Supply | Cardiac plexus |
| Blood Supply | Right coronary artery branches |
| Venous drainage |
|
| Lymphatic drainage |
|
May help prevent backflow of blood into the coronary sinus during atrial contraction.
A large Thebesian valve can make it hard to pass catheters or pacing leads into the coronary sinus, which matters during cardiac resynchronisation and electrophysiology procedures. It forms one border of the triangle of Koch, a landmark for the atrioventricular node.
A prominent valve obstructs lead placement for biventricular pacing.
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