Author Question: A client with coronary artery disease is being prepared for a coronary arterial bypass graft ... (Read 109 times)

casperchen82 · **on:** Jul 23, 2018

A client with coronary artery disease is being prepared for a coronary arterial bypass graft sur-gery. The nurse knows that the coronary artery that carries the most blood and can cause the most harm when blocked is the:

1. Left coronary artery
2. Posterior interventricular artery
3. Circumflex artery
4. Anterior interventricular artery

Question 2

A client who has a history of a major myocardial infarction is taking digoxin. The nurse explains this medication helps increase cardiac output by:

1. Increasing the heart rate
2. Reducing the resistance of pulmonary circulation
3. Increasing the force of the myocardial contraction
4. Increasing cardiac conduction

alexanderhamilton · **Reply #1 on:** Jul 23, 2018

Answer to Question 1

ANS: 1
The left coronary artery, the most abundant blood supply, feeds the left ventricular myocardium, which is more muscular and does most of the heart's work. The posterior and anterior interven-tricular arteries supply blood to the walls of both ventricles. The circumflex artery supplies blood to the walls of the left atrium and left ventricle.

Answer to Question 2

ANS: 3
Myocardial contractility affects stroke volume and cardiac output. Increased contraction increas-es the amount of blood ejected by the ventricles. Digoxin increases cardiac output by inhibiting the sodium-potassium ATPase, which makes more calcium available for contractile proteins, which results in a positive inotropic effect. One of the adverse reactions of digoxin is bradycar-dia. Digoxin does not reduce the resistance of pulmonary circulation or affect the electrical con-duction of the heart.