During the immediate postoperative period following thoracic surgery, a nurse medicates a client for pain on a schedule. The rationale for this nursing action is which of the following?

A. Suppresses the cough reflex: Scheduled pain medication is not intended to suppress coughing, as cough suppression can actually be harmful after thoracic surgery. Clients need to maintain an effective cough to clear secretions and prevent atelectasis or pneumonia. Suppressing this reflex could increase the risk of postoperative respiratory complications. B. Decreases the level of anxiety: Although adequate pain control can help reduce anxiety, this is not the primary goal in the immediate postoperative period following thoracic surgery. Anxiety relief is a secondary benefit, but it does not directly address the major respiratory risks associated with this type of surgery. C. Reduces the respiratory rate: Reducing the respiratory rate is not desirable in a postoperative thoracic surgery client. Opioids can depress respirations, which can compromise oxygenation and ventilation. A lower respiratory rate increases the risk of CO₂ retention and postoperative complications. D. Facilitates deep breathing: Providing pain medication on a schedule ensures that the client can breathe deeply and participate in necessary pulmonary hygiene measures. Thoracic surgery causes significant incisional pain that limits chest expansion, making deep breathing difficult without adequate analgesia.