ATI LPN
Cardiovascular NCLEX Questions Questions
Question 1 of 5
Which of the following phases of cardiac cycle follows immediately after the beginning of the QRS wave?
Correct Answer: D
Rationale: The QRS wave marks ventricular depolarization, followed by isovolumic contraction as ventricles begin to contract.
Question 2 of 5
In normal condition, venous return must be:
Correct Answer: B
Rationale: In steady state, venous return equals cardiac output to maintain circulation.
Question 3 of 5
What enzyme, or combination of enzymes, protects cells against superoxide generated in oxidation reactions?
Correct Answer: C
Rationale: Superoxide dismutase converts superoxide to H2O2, which catalase then breaks down to water.
Question 4 of 5
A 60-year-old man has experienced angina on exertion for the past 6 years. A coronary angiogram performed 2 years ago showed 75% stenosis of the left anterior descending coronary artery and 50% stenosis of the right coronary artery. For the past 3 weeks, the frequency and severity of the anginal attacks have increased, and pain sometimes occurs even when he is lying in bed. Which of the following is most likely to explain these findings?
Correct Answer: C
Rationale: Fissuring of a plaque with mural thrombosis causes unstable angina by partially obstructing flow.
Question 5 of 5
Which one of the following can be used in male patients with erectile dysfunction?
Correct Answer: D
Rationale: Yohimbine, an alpha-2 antagonist, can improve erectile dysfunction.