Final answer:
The patient should be encouraged to continue taking deep breaths and coughing despite the pain to avoid respiratory complications, and can use pain medication to help manage discomfort.
Step-by-step explanation:
The nurse is caring for a patient following an appendectomy. The best response from the nurse to the patient, who winces in pain after taking a deep breath and coughing, would be: "Continue taking deep breaths and coughing to prevent complications."
Deep breathing and coughing help clear the lungs and prevent respiratory complications such as pneumonia, which is important post-surgery. It is also beneficial for the patient to take pain medication to manage discomfort if needed, as this will help them perform necessary respiratory exercises more effectively.