An older patient comes into the clinic complaining of watery diarrhea for several days with abdominal and muscle cramping. The nurse realizes that this patient is demonstrating which imbalance?

Choice A: 18 mg/dL is incorrect because it is within the normal range of BUN, which is 7 to 20 mg/dL. BUN stands for blood urea nitrogen, which is a measure of the amount of nitrogen in the blood that comes from urea, a waste product of protein metabolism. BUN can reflect the kidney function and hydration status of the client.

Choice B: 10 mg/dL is incorrect because it is also within the normal range of BUN. A low BUN level can indicate liver problems, malnutrition, or overhydration.

Choice C: 13 mg/dL is incorrect because it is also within the normal range of BUN. A normal BUN level does not necessarily rule out dehydration, as other factors such as diet, medications, and blood loss can affect the BUN level.

Choice D: 25 mg/dL is correct because it is above the normal range of BUN and indicates a high BUN level. A high BUN level can indicate dehydration, kidney failure, urinary tract obstruction, heart failure, or excessive protein intake. The nurse should report this value to the provider as it may require further evaluation and treatment.

Choice A: Digoxin is correct because it is a medication that can cause visual disturbances, such as blurred vision, yellow-green halos, or photophobia, as a sign of digoxin toxicity. Digoxin toxicity can occur when the serum digoxin level exceeds the therapeutic range of 0.5 to 2 ng/mL. Digoxin toxicity can also cause nausea, vomiting, anorexia, confusion, bradycardia, and cardiac arrhythmias. The risk of digoxin toxicity is increased by hypokalemia, which can lower the threshold for digoxin action and enhance its effects on the cardiac muscle.

Choice B: Aspirin is incorrect because it is a medication that can cause gastrointestinal bleeding, tinnitus, or allergic reactions, but not visual disturbances. Aspirin is an antiplatelet and anti-inflammatory medication that can be used to prevent thromboembolic events, such as stroke or myocardial infarction, in patients with atrial fibrillation.

Choice C: Potassium chloride is incorrect because it is a medication that can cause hyperkalemia, or high potassium level, if taken in excess or in combination with other potassium-sparing drugs, but not visual disturbances. Potassium chloride is a supplement that can be used to treat or prevent hypokalemia, or low potassium level, in patients who are taking diuretics or have other causes of potassium loss.

Choice D: Warfarin is incorrect because it is a medication that can cause bleeding, bruising, or hematoma formation, but not visual disturbances. Warfarin is an anticoagulant that can be used to prevent thromboembolic events, such as stroke or pulmonary embolism, in patients with atrial fibrillation.