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The Koch’s Triangle Is an Unjustified Eponym: The Building of Triangular Locus of the Atrioventricular Node from Todaro to Tandler

by Marcos C De Almeida

Posted: June 26, 2025
Server: Preprints.org
DOI: 10.20944/preprints202506.2135.v1

What is known today as Koch’s triangle (the triangular locus of the atrioventricular node) is delimited by the fibrous attachment of septal tricuspid leaflet, aperture of the coronary sinus and the tendon linking the inferior vena cava valve (Eustachian) and central fibrous body. It was a construct of several exceptional anatomists: Francesco Todaro (Italy), Sunao Tawara (Japan), Arthur keith (United Kingdom), Walter Koch (Germany) and Julius Tandler (Austria). The contributions of Arthur Keith in this topic have been particularly overlooked.It is shown here the development of the concept, and why the eponym Koch it is not fair due to the significant contributions of several anatomists. The triangular locus of atrioventricular node or triangle of atrioventricular node are more instructive and impartial names (Ogden, 2007; Woywodt and Matteson, 2007).

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