A nurse is providing care to a 4-year-old child hospitalized with vomiting and suspected dehydration. The health care provider has prescribed ondansetron 0.5 mg/kg IV as a one-time dose. The safe dose is 5 mg/kg/dose. The child weighs 44 lbs. How many milligrams should the nurse administer? Round your answer to the nearest tenth if needed

A. While administering diphenhydramine may be appropriate for allergic reactions, the priority action is to first stop the transfusion to assess and manage the situation appropriately.

B. Checking the child's apical pulse may provide additional information, but it is not the immediate priority in response to trouble breathing.

C. Stopping the transfusion is the critical first step in managing a suspected transfusion reaction, particularly since the child is exhibiting respiratory distress and a fever, which could indicate an acute hemolytic or allergic reaction.

D. Collecting a urine sample may be indicated later, particularly if a hemolytic reaction is suspected, but it is not an immediate priority over stopping the transfusion and ensuring patient safety.

A. The WBC count is elevated at 15,000/mm³, which indicates leukocytosis. In a child with leukemia, this could suggest a potential relapse or an ongoing infection, which requires prompt evaluation by the provider.

B. The hemoglobin level is at the lower limit of normal (10 g/dL). This can indicate anemia, which is significant in a child with a history of leukemia and may require further investigation or intervention.

C. While the ongoing upper respiratory infection is concerning, it is less urgent than the other findings. The nurse should monitor this but may not need to report it as a critical finding compared to the child's acute symptoms.

D. The presence of clear breath sounds is expected; however, they should be reported in the context of the child's respiratory distress and the associated findings.

E. An oxygen saturation of 92% on room air is below the normal range and indicates hypoxia. This is a critical finding that requires immediate attention from the provider.

F. Subcostal retractions indicate increased work of breathing and respiratory distress, which is an urgent assessment finding that must be communicated to the provider.

G. While the respiratory rate is relevant, the specific number was not provided, and unless it indicates significant distress or abnormality, it may not be a priority report compared to the other findings.

H. The presence of petechiae is concerning, especially in a child with a history of leukemia. This could indicate thrombocytopenia or another hematological issue, which requires further evaluation by the provider.