What is indicated by "right dominance" in coronary physiology?

"Right dominance" in coronary physiology refers to the anatomical variation where the right coronary artery (RCA) supplies the posterior descending artery (PDA). In most individuals with right dominance, the RCA extends to supply not only the right atrium and right ventricle but also the PDA, which runs along the inferior part of the heart, providing blood supply to the inferior wall of the left ventricle. This configuration is critical for understanding coronary artery blood flow and the potential implications for myocardial ischemia and infarction.

In contrast, left dominance occurs when the left coronary artery (LCA) provides the PDA. This anatomical terminology is crucial for planning surgical interventions and for interpreting imaging studies as it relates to the risk of ischemic heart disease. Understanding these dominance patterns helps in evaluating coronary circulation, especially when assessing patients for potential coronary artery disease.