A nurse is caring for a group of toddlers receiving digoxin therapy. For which of the following toddlers should the nurse revise the plan of care?

A. An apical pulse of 100/min is within the normal range for a toddler. Digoxin should be administered cautiously if the heart rate is too low (below 90-100/min for young children), but 100/min is not a concern. B. A potassium level of 4.0 mEq/L is within the normal range for toddlers (3.4-4.7 mEq/L), so there is no indication to revise the plan of care. C. Vomiting is a sign of digoxin toxicity, and it requires immediate attention. The nurse should reassess the digoxin dose and check for other signs of toxicity, such as nausea, bradycardia, and arrhythmias. D. A digoxin level of 1.2 ng/mL is within the therapeutic range for a toddler (0.8-2 ng/mL), so there is no need to revise the plan of care based on this finding.