Which statement about intrathecal fentanyl as a spinal additive is true?

Which statement about intrathecal fentanyl as a spinal additive is true?

• A. It provides analgesia only intraoperatively
• B. It provides analgesia and enhances surgical anesthesia and postoperative analgesia
• C. It has no analgesic effect
• D. It worsens hypotension

Answer: (B)

Intrathecal fentanyl as a spinal additive is used to enhance both the intraoperative anesthesia and the postoperative analgesia. As a lipophilic mu-opioid receptor agonist, it diffuses quickly into the spinal cord and provides rapid analgesia by dampening pain transmission in the dorsal horn. When added to spinal local anesthetic, it improves the quality of the block, often allowing a lower dose of local anesthetic and extending pain relief into the early postoperative period. This means analgesia isn’t limited to the operation itself; patients typically experience better pain control after surgery as well. Hypotension with spinal anesthesia mainly comes from the sympathetic block produced by the local anesthetic, and intrathecal fentanyl does not significantly worsen this hemodynamic effect; in fact, it can reduce the required dose of local anesthetic, which may help preserve stability. While it can cause side effects like pruritus, nausea, urinary retention, and, at higher doses, respiratory depression, these do not outweigh its benefit of providing analgesia during and after surgery.

Intrathecal fentanyl as a spinal additive is used to enhance both the intraoperative anesthesia and the postoperative analgesia. As a lipophilic mu-opioid receptor agonist, it diffuses quickly into the spinal cord and provides rapid analgesia by dampening pain transmission in the dorsal horn. When added to spinal local anesthetic, it improves the quality of the block, often allowing a lower dose of local anesthetic and extending pain relief into the early postoperative period. This means analgesia isn’t limited to the operation itself; patients typically experience better pain control after surgery as well. Hypotension with spinal anesthesia mainly comes from the sympathetic block produced by the local anesthetic, and intrathecal fentanyl does not significantly worsen this hemodynamic effect; in fact, it can reduce the required dose of local anesthetic, which may help preserve stability. While it can cause side effects like pruritus, nausea, urinary retention, and, at higher doses, respiratory depression, these do not outweigh its benefit of providing analgesia during and after surgery.