NCLEX-PN
Cardiac System NCLEX Questions Questions
Question 1 of 5
If the client understands the nurse's explanation of the heart's conduction system, which structure will the client identify as the site of the natural pacemaker? Place an X over the correct site.
Correct Answer: A
Rationale: The sinoatrial (S
A) node is the heart's natural pacemaker, initiating electrical impulses.
Question 2 of 5
A prothrombin time test should be performed regularly on persons who are taking which medication?
Correct Answer: B
Rationale: A prothrombin time test is done to determine the effectiveness of warfarin. A partial thromboplastin time test is used for heparin. Phenobarbital and digoxin do not require regular clotting tests, though serum levels may be monitored for long-term therapy.
Question 3 of 5
The nurse checking the client's leg incision is aware that which is the most common blood vessel used in CABG surgery?
Correct Answer: A
Rationale: The saphenous vein is commonly used in CABG due to its accessibility and suitability for grafting.
Question 4 of 5
If each tablet of digoxin (Lanoxin) contains 0.25 mg, how much should the nurse administer to the client each day?
Correct Answer: A
Rationale: For a 0.125 mg dose with 0.25 mg tablets, administer 0.5 tablets (0.125 mg ÷ 0.25 mg = 0.5).
Question 5 of 5
When the client asks the nurse how propranolol helps to prevent angina, what is the best explanation?
Correct Answer: B
Rationale: Propranolol, a beta-blocker, reduces heart rate and contractility, decreasing myocardial oxygen demand and preventing angina.