<prompt> Cardiac dominance is determined by coronary aerySupplying circulation to the SA nodeSupplying circulation to the inferior poion of the interventricular septumSupplying circulation to the inteatrial septumSupplying circulation to the anterior poion of the interventricular septum  <response>: Cardiac dominance is determined by posterior inter ventricular aery which supplies postero inferior pa of interventricular septum. Mostly this a branch of RCA so right cardiac dominance65 of population If posterior inter ventricular aery arise from left coronary aery, then it is left cardiac dominance in 10 of populationbad prognosis Multiple PIVA one from right side one from left side that is co -dominance in 25 of population. 