The practical nurse (PN) checks the face of an older adult client who is wearing a nasal cannula. Which new finding is most important for the PN to report to the charge nurse?

A. Redness of the cheek under the cannula: Indicates skin irritation, but can usually be managed locally; not the most urgent. B. Dry, cracked mucous membranes: Suggests dryness from oxygen but not immediately life-threatening. C. Encrustations on both of the eyelids: Could indicate infection or poor hygiene but less urgent than neurological changes. D. Drooping of the right side of the mouth: This could indicate a new-onset stroke (facial droop), which is a neurological emergency requiring immediate reporting.