coronary dominance
The anatomical pattern describing which coronary artery gives rise to the posterior descending artery and posterolateral branches.
Full Definition
Coronary dominance refers to the anatomical variation in coronary artery distribution that determines which vessel supplies the inferior wall of the left ventricle and the posterior third of the interventricular septum. Right dominance (85% of population) occurs when the right coronary artery gives rise to the posterior descending artery (PDA) and posterolateral branches. Left dominance (8% of population) occurs when the left circumflex artery provides these vessels. Co-dominance (7% of population) involves shared supply from both systems. Understanding coronary dominance is crucial for interpreting angiographic findings, predicting the clinical significance of lesions, and planning interventional procedures. The dominant system typically also supplies the atrioventricular node.
Usage
Usage note: Always specify the type of dominance (right, left, or co-dominant) when describing coronary anatomy.
In Context
- "Coronary angiography demonstrated right coronary dominance with a large PDA supplying the inferior wall." — Angiography report
- "The patient had left coronary dominance, making the circumflex occlusion hemodynamically significant." — Interventional cardiology note