Correct Answer: B

Rationale: The activated partial thromboplastin time (aPTT) is the laboratory value used to monitor the effectiveness of heparin therapy. The aPTT should be maintained at 1.5 to 2 times the normal level to ensure therapeutic anticoagulation. Monitoring aPTT helps healthcare providers adjust heparin doses to achieve the desired anticoagulant effects and prevent complications such as bleeding or clotting.

Correct Answer: A

Rationale: The correct answer is A: Tinnitus. The healthcare provider should instruct the client to report tinnitus, as it can be an indication of ototoxicity, an adverse effect associated with cisplatin therapy. Ototoxicity is damage to the inner ear structures that can lead to hearing loss, making it crucial for the client to report any early signs such as tinnitus to prevent further complications.

Correct Answer: D

Rationale: Enoxaparin is a medication that should be administered as a subcutaneous injection in the abdomen to prevent bleeding complications. Massaging the injection site after administration should be avoided to reduce the risk of local irritation or bleeding. Rotating injection sites between the arms and thighs is a good practice for some medications but not recommended for Enoxaparin, which should be consistently given in the abdomen for optimal absorption and to avoid complications.

Correct Answer: C

Rationale: Oprelvekin is a medication that stimulates platelet production. Therefore, monitoring the platelet count is essential to assess the effectiveness of this drug. The expected outcome for oprelvekin therapy is a platelet count greater than 50,000/mm^3. Changes in platelet count can indicate the response to the medication and help in adjusting the treatment plan accordingly.

Correct Answer: A

Rationale: When a client is prescribed Prednisone, there is a risk of potassium depletion due to the medication. Therefore, it is essential to increase the intake of potassium-rich foods such as bananas, oranges, and spinach to help maintain adequate potassium levels in the body and prevent complications associated with low potassium levels.