A nurse is providing teaching to the parents of a child who has had a shunt inserted as treatment for hydrocephalus.

The parents demonstrate understanding of the teaching when they make what statement?

Choice A rationale

Antiemetics are most effectively used by administering them proactively, before the chemotherapy agent is started, which is known as prophylactic use. This method allows the medication to achieve therapeutic serum levels and occupy receptors before the emetogenic chemicals stimulate the vomiting center in the brain, thus blocking the nausea pathway.

Choice B rationale

Waiting for nonpharmacologic methods to fail before using antiemetics is ineffective management. Chemotherapy-induced nausea and vomiting are best controlled with aggressive, scheduled pharmacologic intervention from the start, as it is far harder to stop vomiting once the emetic cycle has been established.

Choice C rationale

Starting antiemetics only when nausea begins is reactive and allows the patient to experience unnecessary distress and potential nutritional compromise. The goal in chemotherapy management is prevention; therefore, antiemetics must be started before the patient's exposure to the emetogenic stimuli.

Choice D rationale

Providing antiemetics as needed, or PRN, is a less effective strategy for chemotherapy-induced nausea and vomiting. The intensity of this type of emesis necessitates a scheduled regimen to consistently maintain therapeutic drug levels and prevent the overwhelming onset of nausea and vomiting, which can be difficult to manage once it starts.

Choice A rationale

While ataxia, which is impaired coordination, and seizures may occur in children with brain tumors due to pressure or irritation of specific brain regions, they are generally less consistently reported as the earliest or most frequent hallmark symptoms compared to symptoms related to increased intracranial pressure. The primary location of the tumor dictates the presence of these focal neurological signs, making them variable.

Choice B rationale

Poor fine and gross motor control can be observed if the tumor is located in the cerebellum or motor cortex, but this is a non-specific finding that could be related to many other pediatric neurological or developmental disorders. The gradual onset of motor changes often makes them less reliable as the hallmark sign compared to acute symptoms of pressure.

Choice C rationale

Fever and irritability are common but highly non-specific symptoms in pediatrics, frequently associated with routine infections. While some brain tumors may cause fever, and irritability is a sign of general discomfort or pain, these are rarely the primary indicators pointing definitively toward a brain tumor diagnosis.

Choice D rationale

Headache and vomiting, especially when occurring in the morning or upon waking, are classic symptoms indicating increased intracranial pressure (ICP), which is a common consequence of a growing mass in the fixed space of the skull. The change in position from lying down increases ICP, leading to these characteristic symptoms.