Which opioid neuraxial administration has higher chances of resulting in delayed respiratory depression

Which opioid neuraxial administration has higher chances of resulting in delayed respiratory depression? Why?

Neuraxial administration of lipophilic opioids, such as fentanyl and sufentanil, provides a rapid onset of analgesia, and their rapid clearance from cerebrospinal fluid (CSF) may limit cephalic spread and the development of certain side effects such as delayed respiratory depression. On the other hand, hydrophilic opioids (i.e., morphine and hydromorphone) tend to remain within the CSF and produce a delayed but longer duration of analgesia, along with a generally more frequent incidence of side effects because of the cephalic or supraspinal spread of these compounds.

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