Correct Answer: B

Rationale: Vitamin K can interfere with the effectiveness of Warfarin. Clients should avoid foods high in vitamin K, such as leafy green vegetables.

Correct Answer: A

Rationale: Losartan, an angiotensin II receptor blocker (ARB), can cause hyperkalemia by affecting the renin-angiotensin-aldosterone system. Monitoring serum potassium levels is crucial to detect and manage any potential hyperkalemia, which can lead to serious cardiac arrhythmias.

Correct Answer: A

Rationale: Bradycardia is a common sign of Digoxin toxicity. Digoxin, a medication used to treat heart conditions, can lead to toxicity manifesting as bradycardia. Monitoring the client's heart rate closely is crucial to detect potential toxicity early and prevent complications.

Correct Answer: B

Rationale: Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) that can increase the risk of bleeding when taken with Warfarin due to its antiplatelet effects. The combination of Warfarin, an anticoagulant, and NSAIDs can potentiate the risk of bleeding complications. Clients on Warfarin should avoid NSAIDs and opt for alternative pain relief options to minimize the risk of adverse effects.

Correct Answer: A

Rationale: In this scenario, the client is experiencing severe hypotension due to Verapamil administration. The appropriate medication to counteract the vasodilation caused by Verapamil and reverse severe hypotension is Calcium gluconate, which should be administered slowly IV. Therefore, the correct choice is Calcium gluconate (Choice A).