Cardiac dominance is determined by coronary aery: (A) Supplying circulation to the SA node, (B) Supplying circulation to the inferior poion of the interventricular septum, (C) Supplying circulation to the inteatrial septum, (D) Supplying circulation to the anterior poion of the interventricular septum
Answer is B. 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 dominance(65% of population) If posterior inter ventricular aery arise from left coronary aery, then it is left cardiac dominance in 10% of population(bad prognosis) Multiple PIVA one from right side one from left side that is co -dominance in 25% of population.