AACN CSC Review Course Session 1

70% 30-35% 60-80% coronary perfusion pressure 40 mmHg auto-regulation aortic left main coronary artery PA and aorta left main, circumflex, RCA circumflex artery LAD Cx artery tertiary left main RCA at rest the myocardium extracts % of available oxygen normal SvO2 in heart normal SvO2 in body DBP - LVEDP normal coronary perfusion pressure coronary circulation is a constant due to . the coronary arteries originate behind the respective valve leaflets bifurcates into the LAD and Cx arteries; 2-5cm long; not grafted directly the left main is inaccessible without dividing the and what are the 3 main segments of the coronary circulation coronary artery that courses AV groove beneath LAA; has obtuse marginal branches supplies anterior wall, ant 2/3 septum, post/inf LBB, bundle of his; RBB, LV apex supplies SA node (45%), AV node (10%), inferior LV, lateral LV wall, LA, post/inf LBB 3 vessels of equal diameter between LAD and Cx; supplies large area of LV b/t LAD and Cx arteries; usually subepicar- dial; may give pt a perfusion advantage supplies SA node (55%), AV node (90%), bundle of his, RA and RV, inferior LV, post. 1/3 of septum, post/inf division of left bundle