Correct Answer: C

Rationale: Potassium 3.4 mEq/L is below the expected reference range, which increases the risk for digoxin toxicity. Low potassium levels can lead to fatal dysrhythmias, particularly in older clients taking Digoxin. Monitoring and correcting electrolyte imbalances are crucial to prevent adverse effects of digoxin therapy.

Correct Answer: D

Rationale: The correct instruction for a client prescribed Losartan is to monitor for signs of dehydration. Losartan can lead to dehydration, so it is essential for the client to be vigilant for symptoms such as dry mouth, increased thirst, and decreased urine output. Providing this instruction ensures the client's safety and helps in early identification of any potential issues related to dehydration.

Correct Answer: B

Rationale: Avoiding grapefruit juice is crucial when taking Simvastatin because grapefruit juice can increase the blood levels of the medication. This elevation in drug levels can potentiate the side effects of Simvastatin, such as muscle pain and liver damage. It is essential for the client to be aware of this interaction to prevent potential harm and ensure the effectiveness of the medication.

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: C

Rationale: The correct answer is to instruct the client to avoid sudden discontinuation of Metoprolol. Metoprolol is a beta-blocker that should be tapered off gradually to prevent rebound hypertension and other cardiac issues. Abruptly stopping Metoprolol can lead to serious complications, so it is essential for the client to follow the healthcare provider's guidance on discontinuation.