Final answer:
The nurse should switch the patient to a nasal cannula for eating, ensuring continuous oxygen therapy, providing assistance, and monitoring for distress while the patient is seated upright.
Step-by-step explanation:
When a patient is wearing a Venturi mask, the nurse should ensure that the patient's oxygen therapy is not interrupted while eating. The nurse may need to switch the patient to a different oxygen delivery device such as a nasal cannula that provides similar oxygen concentration while allowing the patient to eat comfortably. This replacement should be brief and should not compromise the patient's oxygen therapy. The nurse should also provide assistance as needed, monitor the patient closely for any signs of distress, and make sure the patient is seated in an upright position to facilitate swallowing and breathing.