The nurse is caring for an immobile client after spinal surgery. Which action is most important for the nurse to take to prevent postoperative complications?

A. Progressing the diet is important but does not address immobility-related complications. B. Maintaining the IV infusion rate is necessary but not specific to preventing complications from immobility. C. Applying intermittent pneumatic compression devices helps prevent deep vein thrombosis (DVT), a significant risk for immobile clients post-surgery. This is a critical preventative measure for immobility-related complications. D. Frequent pain assessments are important but do not specifically prevent complications from immobility.