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Triangle of Koch
Surface landmarks around atrioventricular conduction tissue
High-yield
Koch's triangle locates the AV nodal region; its borders do not reveal the precise depth and course of every patient's conduction axis.
Overview
Three right atrial landmarks outline Koch's triangle: the tendon of Todaro, the septal tricuspid leaflet's hinge and the coronary sinus opening. The compact AV node lies near its apex, with the conduction axis continuing into the central fibrous body. Exact tissue positions differ between hearts.
Reference facts
- Boundaries
- Tendon of Todaro, septal tricuspid leaflet hinge and the coronary sinus ostium
- Contents
- The AV nodal region near the apex, with neighboring atrial connections and vascular supply
- Communications
- The conduction axis continues from the apex into the central fibrous body as the His bundle
Clinical correlation
Interventions near this region can damage AV conduction. Its variable anatomy matters when clinicians assess procedures involving the septal tricuspid area or AV nodal pathways.
Frequently asked questions
What are the boundaries of the triangle of Koch?
The triangle of Koch is bounded by the tendon of Todaro, septal tricuspid leaflet hinge and the coronary sinus ostium.
What does the triangle of Koch contain?
The AV nodal region near the apex, with neighboring atrial connections and vascular supply.
What does the triangle of Koch communicate with?
The conduction axis continues from the apex into the central fibrous body as the His bundle.