An outpatient who has chronic heart failure returns to the clinic after 2 weeks of therapy with metoprolol (Toprol XL). Which assessment finding is most important for the nurse to report to the health care provider?

Correct Answer: D

Rationale: The patient's BP indicates that the dose of metoprolol may need to be decreased because of hypotension. Bradycardia is a frequent adverse effect of β-adrenergic blockade, but the rate of 56 is not unusual though it may need to be monitored. β-Adrenergic blockade initially will worsen symptoms of heart failure in many patients and patients should be taught that some increase in symptoms, such as fatigue and edema, is expected during the initiation of therapy with this class of drugs.

Correct Answer: D

Rationale: Phase 3 (repolarization) has the highest potassium permeability as potassium channels open to restore resting potential.

Correct Answer: A

Rationale: The baroreceptor reflex primarily regulates blood pressure in the short term by adjusting heart rate and vessel tone.

Correct Answer: D

Rationale: Acute myocardial infarction impairs heart function, reducing cardiac output.

Correct Answer: A

Rationale: HDL is synthesized by the liver and intestine.