coronary dominance
The pattern determining which coronary artery gives rise to the posterior descending artery and supplies the inferior myocardium.
Full Definition
Coronary dominance refers to the anatomical pattern that determines which major coronary artery supplies the inferior and posterior walls of the left ventricle. Right dominance (85-90% of patients) occurs when the right coronary artery gives rise to the posterior descending artery (PDA) and posterolateral branches. Left dominance (10-15% of patients) occurs when the left circumflex artery provides these vessels. Co-dominance is a rare variant where both the RCA and LCX contribute to the inferior circulation. Understanding dominance patterns is crucial for interpreting the clinical significance of coronary lesions and predicting the territory at risk during coronary occlusions.
Usage
Usage note: Should specify right, left, or co-dominance when documenting coronary anatomy.
In Context
- "Right coronary dominance was confirmed with the RCA giving rise to both the PDA and posterolateral branches." — Angiographic interpretation
- "The unusual left dominant pattern explained why the circumflex occlusion resulted in inferior wall ischemia." — Case discussion