Cardiac dominance is determined by coronary artery : fmge september2009

Cardiac dominance is determined by coronary artery :   fmge september2009

a. supplying circulation to the SA node

b. Supplying circulation to the inferior portion of the interventricular septum

c. Supplying circulation to the interatrial septum

d. Supplying circulation to the anterior portion of the interventricular septum

answer : b

Coronary artery dominance

The artery that supplies the posterior descending artery (PDA)(a.k.a. posterior interventricular artery) determines the coronary dominance.

• If the posterior descending artery (PDA) (a.k.a. posterior interventricular artery) is supplied by the right coronary artery (RCA), then the coronary circulation can be classified as "right-dominant".
• If the posterior descending artery (PDA) is supplied by the circumflex artery (CX), a branch of the left artery, then the coronary circulation can be classified as "left-dominant".
• If the posterior descending artery (PDA) is supplied by both the right coronary artery (RCA) and the circumflex artery, then the coronary circulation can be classified as "co-dominant".

Approximately 70% of the general population are right-dominant, 20% are co-dominant, and 10% are left-dominant A precise anatomic definition of dominance would be the artery which gives off supply to the AV node i.e. the AV nodal artery. Most of the time this is the right coronary artery.