Correct Answer: A

Rationale: Clients with heart failure often follow a sodium-restricted diet. Sodium phosphate laxatives can lead to sodium absorption, causing fluid retention, which is contraindicated in heart failure. It is crucial to avoid sodium phosphate laxatives in these clients to prevent exacerbation of fluid overload and heart failure symptoms.

Correct Answer: C

Rationale: The nurse should monitor the platelet count to determine the effectiveness of Oprelvekin. The expected outcome for this medication is a platelet count greater than 50,000/mm^3. Oprelvekin is a medication used to stimulate platelet production, making platelet count a crucial parameter to assess its effectiveness.

Correct Answer: D

Rationale: Anorexia is a common manifestation of digoxin toxicity, along with symptoms such as blurred vision, stomach pain, and diarrhea. It is important for healthcare providers to recognize these signs to prevent serious complications.

Correct Answer: B

Rationale: Chewing sugarless gum can help alleviate dry mouth, which is a common anticholinergic effect of Fluphenazine. This intervention can provide relief and improve the client's comfort while taking the medication.

Correct Answer: A

Rationale: The correct answer is to instruct the client to avoid salt substitutes. Lisinopril, an ACE inhibitor, can lead to hyperkalemia, so it's essential to avoid salt substitutes that may contain potassium which can further elevate potassium levels.