ATI LPN
Cardiovascular System Questions Questions
Question 1 of 5
When recording lead aVL on ECG, the positive electrode is the:
Correct Answer: A
Rationale: Lead aVL uses the left arm as the positive electrode, with the right arm and left leg as reference.
Question 2 of 5
An increase in contractility is determined on a Frank-Starling diagram by:
Correct Answer: B
Rationale: Increased contractility raises cardiac output for the same end-diastolic volume on a Frank-Starling curve.
Question 3 of 5
The free radical nitric oxide is generated in cells by reaction catalyzed by:
Correct Answer: B
Rationale: Nitric oxide synthase (NOS) catalyzes the production of nitric oxide.
Question 4 of 5
A 50-year-old man with familial hyperlipidemia undergoes resection of an abdominal aneurysm. Signs of congestive heart failure develop shortly after surgery. Despite treatment, the patient becomes hypotensive and expires 2 days later. Autopsy reveals marked narrowing of coronary arteries, without thrombosis. Multiple foci of necrosis are found circumferentially around the inner walls of both ventricles. Which of the following is the most likely cause of congestive heart failure in this patient?
Correct Answer: D
Rationale: Subendocardial infarction from severe coronary narrowing explains the CHF and necrosis pattern.
Question 5 of 5
Streptokinase is a bacterial protein produced by:
Correct Answer: B
Rationale: Streptokinase is produced by beta-hemolytic streptococci, particularly Streptococcus pyogenes.