the blood supply of the av node is from the atrioventricular nodal branch. the origin of this artery is most commonly (80-90% of hearts) a branch of the right coronary artery, with the remainder originating from the left circumflex artery. this is associated with the dominance of the coronary artery circulation. in "right-dominant" individuals the blood supply is from the right coronary artery while in left dominant individuals it originates from the left circumflex artery.