When caring for a client receiving a 20% mannitol IV solution at the rate of 100 grams/24 hours (or 70 mg/min), which outcome data is most important for the practical nurse (PN) to collect?

Choice A reason: Digoxin toxicity can cause visual disturbances, like seeing yellow halos, due to its effect on retinal cone cells. The client’s comment about a yellow uniform suggests this side effect. Evaluating for toxicity, including checking serum digoxin levels, is critical, as toxicity can lead to life-threatening arrhythmias.

Choice B reason: Withholding furosemide and forcing fluids is inappropriate, as the client’s visual symptom points to digoxin toxicity, not furosemide-related issues. Furosemide causes diuresis, but no evidence suggests dehydration here. This choice does not address the likely digoxin-induced visual disturbance.

Choice C reason: Assuming the client is joking ignores a potential digoxin toxicity symptom. Visual changes, like yellow-tinted vision, are serious and require investigation, not dismissal. Administering medications without evaluation risks exacerbating toxicity, making this choice unsafe and incorrect.

Choice D reason: Additional potassium-rich foods are unnecessary, as the client is already receiving potassium chloride. The visual symptom suggests digoxin toxicity, not hypokalemia. Potassium levels may influence digoxin toxicity, but the priority is evaluating digoxin’s effects, not dietary intervention.

Choice A reason: Eating aged cheeses, high in tyramine, is relevant for monoamine oxidase inhibitors, not TCAs, which do not interact with tyramine. This dietary habit does not affect TCA-related sleep disturbances, making it irrelevant for addressing the client’s early morning awakening.

Choice B reason: Taking a warm bath at night may promote relaxation but does not directly address TCA-related sleep issues. While helpful for general sleep hygiene, it is less critical than medication timing, which directly influences TCA’s stimulatory effects on sleep patterns.

Choice C reason: Dry mouth is a common TCA side effect due to anticholinergic properties but is not directly linked to sleep disturbances. It may cause discomfort but does not explain or address early morning awakening, making this information less relevant for sleep improvement.

Choice D reason: Taking TCAs upon rising can cause insomnia, as their stimulatory effects peak during sleep hours. TCAs increase norepinephrine, disrupting sleep architecture. Adjusting to bedtime dosing may reduce early morning awakening, making this information critical for optimizing sleep and therapeutic outcomes.