AACN CSC Review Course Session 1 Questions and Answers

at rest the myocardium extracts ___% of available oxygen o :## 70% normal SvO2 in heart o :## 30-35% normal SvO2 in body o :## 60-80% DBP - LVEDP o :## coronary perfusion pressure normal coronary perfusion pressure o :## 40 mmHg coronary circulation is a constant due to _______________________. o :## auto-regulation the coronary arteries originate behind the respective ________ valve leaflets 2024/2025 2 | P a g e o :## aortic bifurcates into the LAD and Cx arteries; 2-5cm long; not grafted directly o :## left main coronary artery the left main is inaccessible without dividing the _____ and _____ o :## PA and aorta what are the 3 main segments of the coronary circulation o :## left main, circumflex, RCA coronary artery that courses AV groove beneath LAA; has obtuse marginal branches o :## circumflex artery supplies anterior wall, ant 2/3 septum, post/inf LBB, bundle of his; RBB, LV apex o :## LAD supplies SA node (45%), AV node (10%), inferior LV, lateral LV wall, LA, post/inf LBB o :## Cx artery 3 vessels of equal diameter between LAD and Cx; supplies large area of LV b/t LAD and Cx arteries; usually subepicardial; may give pt a perfusion advantage 2024/2025 3 | P a g e o :## tertiary left main 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 o :## RCA coronary artery that arises from aorta and courses AV groove; bifurcates at junction of RA and LA o :## RCA lead that looks at Cx artery from left arm to right arm o :## lead I lead that looks at RCA from left leg to right arm o :## lead II lead that looks at RCA from left leg to left arm o :## lead III EKG leads that look at LAD at the septum o :## V1 and V