Knowing which coronary artery has the blockage can help you understand the effects of an MI on the myocardium. And seeing regional wall motion abnormalities on echo can often tell you which coronary artery has the blockage. Because certain areas of the heart are supplied by certain coronary arteries. But, there is a trick. In most people, the inferior wall of the heart is supplied by the right coronary artery (RCA), but in some people, it is supplied by the circumflex (LCx). This is known as coronary artery dominance and this Instagram post from our friends over at foamfrat explains it in a little more detail.
critical care notes 