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Geometry of Koch's triangle.

Wieslawa Klimek-Piotrowska1, Mateusz K Holda1, Mateusz Koziej1

  • 1Department of Anatomy, Jagiellonian University Medical College, Kopernika 12, 31-034 Cracow, Poland.

Europace : European Pacing, Arrhythmias, and Cardiac Electrophysiology : Journal of the Working Groups on Cardiac Pacing, Arrhythmias, and Cardiac Cellular Electrophysiology of the European Society of Cardiology
|June 2, 2016
PubMed
Summary

This study measured Koch's triangle dimensions in 120 human hearts, finding significant individual variations. The triangle's size was largely independent of other heart parameters, with a maximum height estimated at 22 mm.

Keywords:
Atrioventricular nodeCoronary sinus ostiumEustachian ridgeTendon of TodaroTriangle of Koch

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Area of Science:

  • Anatomy
  • Cardiology
  • Morphometrics

Background:

  • Koch's triangle is a critical anatomical landmark in the heart.
  • Understanding its dimensions is essential for cardiac procedures and research.

Purpose of the Study:

  • Determine the size of Koch's triangle.
  • Investigate relationships between triangle dimensions and individual/heart-specific parameters.
  • Develop a formula to estimate triangle dimensions.

Main Methods:

  • Prospective study of 120 autopsied adult human hearts (Caucasian).
  • Dissection and measurement of Koch's triangle sides, angles, and area.
  • Linear regression analysis to correlate triangle dimensions with 16 additional heart parameters.

Main Results:

  • Mean anterior edge: 18.0 ± 3.8 mm; posterior edge: 20.3 ± 4.3 mm; basal edge: 18.5 ± 4.0 mm.
  • Mean Koch's triangle area: 151.5 ± 55.8 mm².
  • Triangle dimensions showed strong independence from other morphometric parameters; maximum height estimated at 22 mm.

Conclusions:

  • Koch's triangle exhibits significant individual variability in size.
  • Dimensions are largely independent of individual and heart-specific factors.
  • A maximum triangle height of 22 mm can be estimated.