ATI LPN
Cardiovascular NCLEX Questions with Rationale Questions
Question 1 of 5
If the Purkinje fibers, situated distal to the AV junction, become the pacemaker of the heart, what is the expected heart rate?
Correct Answer: A
Rationale: Purkinje fibers as pacemakers produce a rate of 20-40 beats/min, with 30/min being typical.
Question 2 of 5
A 75-year-old male goes to the hospital ER and faints. Five minutes later he is alert. An ECG shows 75 P-waves per minute and 35 QRS complexes per minute with normal QRS width. Which of the following is the most likely diagnosis?
Correct Answer: B
Rationale: Stokes-Adams syndrome involves transient complete heart block, causing fainting with a slow ventricular rate.
Question 3 of 5
Which is correct regarding HDL?
Correct Answer: C
Rationale: HDL removes cholesterol from tissues and delivers it to the liver, aiding reverse cholesterol transport.
Question 4 of 5
A 59-year-old man has experienced chest pain at rest for the past year. On physical examination, his pulse is 80/min and irregular. Which of the following laboratory findings is most likely to have a causal relationship to the process illustrated?
Correct Answer: C
Rationale: Low HDL promotes atherosclerosis by reducing cholesterol clearance, contributing to coronary artery disease.
Question 5 of 5
Which of the following will cause tachycardia?
Correct Answer: A
Rationale: Prazosin, an alpha-blocker, causes reflex tachycardia by reducing vascular tone.