A patient has recently started on digoxin (Lanoxin) in addition to furosemide (Lasix) and captopril for the management of heart failure. Which assessment finding by the home health nurse is a priority to communicate to the health care provider?

Correct Answer: C

Rationale: Hypokalemia can predispose the patient to life-threatening dysrhythmias (e.g., premature ventricular contractions) and potentiate the actions of digoxin. Hypokalemia also increases the risk for digoxin toxicity, which can also cause life-threatening dysrhythmias. The other data indicate that the patient's heart failure requires more effective therapies, but they do not require nursing action as rapidly as the low serum potassium level.

Correct Answer: A

Rationale: The core of heart valves is covered by endocardium, the innermost layer lining the heart.

Correct Answer: B

Rationale: Epinephrine directly increases heart rate via its chronotropic effect on the SA node.

Correct Answer: B

Rationale: Severe cardiac tamponade compresses the heart, reducing venous return and shifting the cardiac output curve left.

Correct Answer: C

Rationale: Type III hyperlipoproteinemia results from Apo E deficiency, impairing remnant clearance.