Prioritizing Nursing Interventions for Immobile Patient

A nurse is caring for a patient who has been placed on bed rest due to a severe exacerbation of chronic obstructive pulmonary disease (COPD). The physician has ordered strict respiratory monitoring and initiation of passive range-of-motion (ROM) exercises every four hours. The patient expresses anxiety about being immobile and is concerned about developing pressure ulcers and deep vein thrombosis (DVT). Which nursing intervention should the nurse prioritize to ensure the patient's comfort and safety during this period of immobility?