Final answer:
Facilitating the client's deep breathing is the most important desired effect of administering opioid medications for postoperative recovery following CABG surgery.
Step-by-step explanation:
The nurse should identify that facilitating the client's deep breathing is the most important desired effect of administering opioid medications for postoperative recovery following coronary artery bypass graft (CABG) surgery. Deep breathing exercises can improve lung function and prevent complications such as pneumonia or atelectasis. Opioid medications can cause respiratory depression, so encouraging deep breathing is crucial for the client's recovery.