You are rounding on your other patients when Mr. Romaine presses his call light and states, "I feel like I can't catch my breath." When you enter the room, you see Mr. Romaine sitting in the recliner, breathing rapidly and appearing anxious. Recognizing a potential problem, you promptly collect a complete set of vital signs. A quick medical record review shows a history of cognitive heart failure. His home medications include metoprolol, lisinopril, furosemide, aspirin, ferrous gluconate, and potassium chloride. You recall that Mr. Romaine told you earlier that he did not take his morning medications before coming to the emergency room. Which home medication(s) that were not taken would have the greatest impact on his current status? Include the rationale..