• Coronary arterial dominance
  • Right-dominant (∼ 85% of the population): posterior descending artery (PDA) supplied by the RCA
  • Left-dominant (∼ 8% of the population): PDA supplied by the left circumflex artery (LCX)
  • Codominant (balanced; ∼ 7% of people): PDA supplied by both RCA and LCX
• Coronary blood flow peaks during early diastole at a point when the pressure differential between the aorta and the ventricle is the greatest (see left ventricular pressure-volume diagram.)
• Right coronary artery (RCA)
  • Right marginal artery: courses along the diaphragmatic border (acute margin) of the heart
    • Lateral right ventricle and cardiac apex
  • Posterior descending artery (PDA): descends between right and left ventricles on posterior surface of heart (in the posterior interventricular sulcus) towards cardiac apex
    • Can also originate from the LCX OR LCX and RCA (in left-dominant and codominant circulation, respectively)
  • Atrioventricular nodal artery
    • AV node (in a left dominant circulation, the AV node is supplied by the LCA)
    • Bundle of His (minor contribution from the LAD)