Nursing cardiac surgery patients

In adult cardiac surgery patients experiencing post-operative pain (P) immediately following surgery (P), is morphine (I) or fentanyl (C), administered intravenously, more effective in reducing postoperative pain (O)?
For immune-compromised patients, 50 years and older (P), does the use of pneumonia vaccine (I) reduce the future risk of pneumonia (O) compared with patients who have not received the vaccine (C)?

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