An 80-year-old client is admitted with nausea and vomiting. The client has a history of heart failure and is being treated with digoxin (Lanoxin). The client has been nauseated for a week and began...

An 80-year-old client is admitted with nausea and vomiting. The client has a history of heart failure and is being treated with digoxin (Lanoxin). The client has been nauseated for a week and began vomiting 2 days ago. Laboratory values indicate hypokalemia. Because of these clinical findings, the nurse should assess the client carefully for signs of which of the following conditions?

1. Chronic renal failure.

2. Exacerbation of heart failure.

3. Digoxin toxicity.

4. Metabolic acidosis.