A patient with heart failure has a new order for captopril 12.5 mg PO. After giving the first dose and teaching the patient about the drug, which statement by the patient indicates that teaching has been effective?

Correct Answer: C

Rationale: Captopril can cause hypotension, especially after the initial dose, so it is important that the patient not get up out of bed without assistance until the nurse has had a chance to evaluate the effect of the first dose. The angiotensin-converting enzyme (ACE) inhibitors are potassium sparing, and the nurse should not teach the patient to purposely increase sources of dietary potassium. Increased shortness of breath is expected with the initiation of β-adrenergic blocker therapy for heart failure, not for ACE inhibitor therapy. ACE inhibitors are best absorbed when taken an hour before eating.

Correct Answer: A

Rationale: Purkinje fibers, part of the conduction system, are located in the endocardium of the heart.

Correct Answer: D

Rationale: Patent ductus arteriosus causes a continuous murmur, but it's loudest in systole, fitting the systolic category.

Correct Answer: D

Rationale: Sympathetic stimulation releases norepinephrine, increasing heart rate and contractility.

Correct Answer: D

Rationale: The liver metabolizes about 60% of lactate during exercise via the Cori cycle.