A nurse is preparing to suction a 5-year-old child with a severe traumatic brain injury who is intubated.

Which of the following actions is most appropriate to prevent a rise in intracranial pressure (ICP)?

Choice A rationale

Administering sedation (e.g., narcotics or benzodiazepines) prior to invasive procedures like suctioning is crucial to blunt the reflex sympathetic response. Suctioning can induce coughing, gagging, and pain, which dramatically increase systemic blood pressure and, consequently, cerebral blood volume and intracranial pressure (ICP), leading to secondary brain injury. Sedation provides analgesia and anxiolysis, minimizing these adverse physiological reactions.

Choice B rationale

Lowering the head of the bed (HOB) can increase cerebral blood flow and impede venous drainage from the head and neck vessels, thereby increasing cerebral blood volume and consequently intracranial pressure (ICP). For a child with severe traumatic brain injury, the HOB should typically be elevated to 30 degrees to promote optimal venous outflow and pressure regulation.

Choice C rationale

While performing suctioning quickly minimizes the duration of the noxious stimulus, it does not address the initial reflexive physiological response to the stimulus itself, which triggers the rise in ICP. The most effective preventative measure is to pre-oxygenate and administer sedation to mitigate the body's adverse reaction before and during the necessary procedure.

Choice D rationale

Delaying suctioning until ICP has already risen is a reactive measure, not a preventative one, and risks secondary brain injury from sustained or high-peak ICP. Suctioning must be performed when secretions compromise airway patency, but the goal is to mitigate the expected ICP rise through proactive interventions like pre-sedation and hyperoxygenation before the procedure is initiated.

Choice A rationale

The expected urine output for an infant is 1-2 mL/kg/hr. For this 7.5 kg infant, the minimum expected output is (1 mL/kg/hr× 7.5 kg) × 12 hours = 90 mL. The actual output of 93 mL over 12 hours is just above the minimum of 90 mL, placing it within the normal, expected physiological range.

Choice B rationale

This choice is incorrect because the calculated minimum normal urine output for a 7.5 kg infant over 12 hours is 90 mL. The actual output of 93 mL exceeds this minimum threshold, confirming that the infant's renal excretion is adequate and within the lower bounds of the normal physiological range.