Final answer:
The nurse would not use promethazine in children under the age of 2 because it can cause severe respiratory depression. In the scenarios provided, symptoms of nausea, vomiting, and diarrhea indicate possible gastrointestinal infections, requiring medical attention and rehydration.
Step-by-step explanation:
The nurse is aware that promethazine will not be used for a child under the age of 2 who has been hospitalized with dehydration secondary to nausea and vomiting because it can cause severe respiratory depression in young children. This is a significant risk, as children under two years of age have increased susceptibility to the sedative and respiratory effects of this medication. Therefore, promethazine is contraindicated for pediatric patients under the age of 2.
In the given scenarios, Carli's signs and symptoms of nausea, vomiting, diarrhea, and fever could be indicative of a gastrointestinal infection or food poisoning, which can result in dehydration. Similarly, Hannah's symptoms of vomiting, light sensitivity, stiff neck, and confusion suggest a possible central nervous system infection or another serious condition requiring medical attention. Prompt rehydration and medical intervention are crucial in such cases to prevent complications such as severe dehydration and change in blood pressure and heart rate.