Which option correctly lists the three structures that form the triangle of Koch?

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Study for the EPU Electrophysiology Exam with comprehensive questions and explanations. Enhance your knowledge with flashcards and a variety of question formats to ensure you are prepared to excel!

Multiple Choice

Which option correctly lists the three structures that form the triangle of Koch?

Explanation:
Koch's triangle in the right atrium marks the region where the AV node resides. It is defined by three landmarks: the septal leaflet of the tricuspid valve, the coronary sinus ostium, and the tendon of Todaro. These three structures together outline the boundaries of the triangle, and the AV nodal tissue sits at the inferior/apical part of that area. That’s why identifying those exact structures is key: they form the anatomical frame that contains the AV node, which is central in electrophysiology procedures like ablation for certain tachycardias. The other structures listed don’t form this boundary—fossa ovalis and mitral valve are in different regions, and the crista terminalis is a prominent muscular ridge not constituting Koch’s triangle.

Koch's triangle in the right atrium marks the region where the AV node resides. It is defined by three landmarks: the septal leaflet of the tricuspid valve, the coronary sinus ostium, and the tendon of Todaro. These three structures together outline the boundaries of the triangle, and the AV nodal tissue sits at the inferior/apical part of that area. That’s why identifying those exact structures is key: they form the anatomical frame that contains the AV node, which is central in electrophysiology procedures like ablation for certain tachycardias. The other structures listed don’t form this boundary—fossa ovalis and mitral valve are in different regions, and the crista terminalis is a prominent muscular ridge not constituting Koch’s triangle.

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