A nurse is assessing a child who has a suspected head injury. Which of the following actions should the nurse take to assess the child's cognitive status?

Choice A reason: Chickenpox, caused by varicella-zoster virus, presents with a rash and fever, not the characteristic cough of pertussis. It is a distinct viral infection, unrelated to the bacterial respiratory pathology of pertussis, which is caused by Bordetella pertussis.

Choice B reason: Pertussis, caused by Bordetella pertussis, is commonly called whooping cough due to the distinctive whooping sound during coughing fits. This bacterial infection causes severe, prolonged coughing, particularly in children, making it the correct common name for the disease.

Choice C reason: Measles, caused by the rubeola virus, presents with rash, fever, and Koplik spots, not a whooping cough. It is a viral infection, distinct from the bacterial etiology of pertussis, making this an incorrect common name for the condition.

Choice D reason: Fifth disease, caused by parvovirus B19, causes a slapped-cheek rash, not a cough. It is a viral infection, unrelated to the bacterial respiratory symptoms of pertussis, making it an incorrect common name for this bacterial disease.

Choice A reason: A 109 ml/hour rate is excessive for a 13.5 kg child. Using the 4-2-1 rule (4 ml/kg/hour for the first 10 kg, 2 ml/kg/hour for the next 3.5 kg), the total is 47 ml/hour, not 109, which could cause fluid overload and cardiovascular strain.

Choice B reason: A 79 ml/hour rate overestimates maintenance fluids for a 13.5 kg child. The 4-2-1 rule yields 47 ml/hour (40 ml for 10 kg + 7 ml for 3.5 kg). Higher rates risk hypervolemia, potentially causing pulmonary edema or electrolyte imbalances in a child.

Choice C reason: For a 13.5 kg child, the 4-2-1 rule calculates maintenance fluids as 40 ml/hour (10 kg × 4 ml) + 7 ml/hour (3.5 kg × 2 ml) = 47 ml/hour, closest to 49 ml/hour. This rate maintains hydration without risking fluid overload, supporting renal and cardiovascular function.

Choice D reason: A 200 ml/hour rate is far too high for a 13.5 kg child, risking fluid overload, heart failure, or pulmonary edema. The correct maintenance rate, per the 4-2-1 rule, is approximately 47 ml/hour, making this choice dangerously excessive for pediatric fluid needs.