What is a known contraindication for using oral glucose?

Using oral glucose is contraindicated when a patient has an altered mental status, particularly in cases where snoring airway sounds are present. This condition indicates that the patient's airway may not be adequately protected and could lead to aspiration if they are unable to swallow properly. Administering oral glucose in such a scenario poses a high risk for airway obstruction and further complications.

In cases of altered consciousness, there may be a diminished gag reflex, making it dangerous for the patient to take anything by mouth, including oral glucose, which requires a certain level of cognitive function to swallow safely.

The other choices, while they may raise concerns, do not provide the same immediate risk regarding airway management. For instance, a blood glucose level of 48 mg/dL indicates hypoglycemia and warrants intervention, while a history of strokes or seizures alone does not automatically contraindicate the use of oral glucose since the key factor is the patient's current cognitive status. Similarly, age does not inherently restrict the administration of oral glucose if the airway is secure.