Final answer:
For a patient with dyspnea, the nurse should prepare the bed in an upright or semi-upright position, like the Fowler's position, to help improve breathing.
Step-by-step explanation:
To best prepare for the arrival of a patient with dyspnea (difficulty breathing), the nurse should ensure that the patient's bed is in a position that will facilitate easier breathing. While prone describes a face-down orientation and supine describes a face-up orientation, these positions are not ideal for someone with dyspnea. Instead, the patient's bed should be in an upright or semi-upright position, such as the Fowler's position, where the backrest is raised to help improve lung expansion and ease breathing.