RCA in the Right Anterior Oblique Projection

The injection into the right coronary artery is displayed in the right anterior oblique projection revealing in order of branching the sinoatrial nodal artery (SAn) the acute marginal artery (AM) that separates the anterior portion of the heart from the posterior. The RCA continues in the posterior A-V groove. The next branch off the RCA is the right atrial branch (RA). When the RCA reaches the posterior interventricular groove it takes a 90 degree turn as it gives off the posterior descending artery ( PDA). The septal perforators (unlabeled) are shown as multiple small vertical branches off the PDA that supply the lower 1/3 of the septum. Note in this patient the PDA curves around to supply the apex – This is uncommon since the LAD usually assumes this function.

Courtesy: Ashley Davidoff, M.D.