ATI LPN
Cardiovascular Questions and Answers PDF Questions
Question 1 of 5
When recording lead I on an ECG, the right arm is the negative electrode, and the positive electrode is:
Correct Answer: A
Rationale: In lead I, the right arm is negative, and the left arm is positive, measuring the potential difference across the arms.
Question 2 of 5
Venous return is determined by:
Correct Answer: D
Rationale: All listed factors—blood volume, venous capacity, and muscle activity—affect venous return.
Question 3 of 5
Which of the following is unable to protect the cell against free radical damage?
Correct Answer: B
Rationale: Xanthine oxidase generates free radicals, unlike the others which neutralize them.
Question 4 of 5
A 50-year-old man with a lengthy history of diabetes mellitus and hypertension has had pain in the left shoulder and arm for the past 12 hours. Over the next 6 hours, he develops shortness of breath, which persists for 2 days. On day 3, he visits the physician. On physical examination, his blood pressure is 160/100 mm Hg. Laboratory studies show that the total creatine kinase (CK) activity is within reference range, but the troponin I level is elevated. The patient is admitted to the hospital and continues to experience dyspnea for the next 3 days. On day 7 after the onset of shoulder pain, he has a cardiac arrest. Postmortem examination shows a large transmural infarction of the left anterior free wall with rupture and hemopericardium. Which of the following statements is best supported by these clinical and autopsy data?
Correct Answer: C
Rationale: Elevated troponin I on day 3 indicates an infarction began on day 1, supported by the autopsy findings.
Question 5 of 5
Which one of the following is correct regarding alpha-adrenergic blockers?
Correct Answer: B
Rationale: Alpha-blockers like tamsulosin treat benign prostatic hyperplasia by relaxing smooth muscle.