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In 85% of patients the right coronary artery (RCA) is said to be "dominant"
because it supplies circulation to the inferior portion of the interventricular
septum via the right posterior descending coronary artery or PDA branch.
In these cases the RCA travels to the cross-section of the AV
groove and the posterior interventricular (IV groove). Here, it gives
rise to the right posterior descending coronary artery (PDA) branch
which travels in the posterior IV groove and gives off several
septal perforator branches (SP). The SP supply blood to the lower portion
of the IV septum.
Generally, the dominant RCA also gives
rise to the AV nodal branch which supplies blood to the AV