1. The answer is B. CHEOPS can have a maximum score of 13.
2. The answer is A. Intrathecal morphine can produce biphasic respiratory depression, the delayed depression occurring after 12 h of administration.
3. The answer is A. Though controversial, it can be used in younger children. Longer-acting opioids such as morphine and hydromorphone are commonly employed in PCA.
4. The answer is D. When combining A and B, care should be taken not to exceed the total maximum dose of local anesthetic agent used.
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