An adult with arthritis has been receiving treatment with naproxen and now reports ongoing stomach pain, increasing weakness, and fatigue. Which laboratory test should the nurse monitor?

Choice A: Administering a half dose now is not advisable, because it may result in underdosing or overdosing of digoxin. Digoxin has a narrow therapeutic range and a high risk of toxicity, especially in infants and children. The amount of digoxin absorbed by the infant before vomiting is unknown, so giving a partial dose may not achieve therapeutic levels or may exceed safe levels.

Choice B: Giving another dose is not advisable, because it may result in overdosing of digoxin. Digoxin has a narrow therapeutic range and a high risk of toxicity, especially in infants and children. The amount of digoxin absorbed by the infant before vomiting is unknown, so giving a full dose may exceed safe levels and cause adverse effects such as nausea, vomiting, bradycardia, arrhythmias, or visual disturbances.

Choice C: Mixing the next dose with food is not advisable, because it may affect the absorption and bioavailability of digoxin. Digoxin should be taken on an empty stomach or at least one hour before or two hours after meals, because food can interfere with its absorption from the gastrointestinal tract and reduce its effectiveness.

Choice D:Withholding the dose is the safest option. If vomiting occurs within 30 minutes of administration, it’s generally advised to skip that dose to avoid the risk of overdose.The next dose should be given as scheduled Digoxin has a long half-life and accumulates in tissues, so missing one dose will not significantly affect its therapeutic effect. Withholding this dose will avoid overdosing and toxicity of digoxin, which can be life-threatening in infants and children. The nurse should also advise the mother to resume the regular dosing schedule and monitor the infant's pulse rate and signs of digoxin toxicity.

Choice A reason: This is incorrect because seizure precautions are not indicated for dopamine administration. Dopamine does not lower the seizure threshold or cause convulsions.

Choice B reason: This is incorrect because monitoring serum potassium frequently is not necessary for dopamine administration. Dopamine does not affect potassium levels or cause hyperkalemia or hypokalemia.

Choice C reason: This is correct because ensuring pump accuracy to prevent toxicity is essential for dopamine administration. Dopamine is a potent vasoconstrictor that can cause tissue necrosis, gangrene, and hypertension if overdosed.

Choice D reason: Dopamine is given to hypotensive patients, meaning they may be weak, dizzy, or at risk of falls.Ambulating frequently could worsen hypotension and increase fall risk rather than help the patient. Instead, the nurse should monitor the patient’s hemodynamic status and ensure bed rest as needed until blood pressure stabilizes.