Clonidine can be used as an adjuvant in spinal anesthesia to prolong sensory block.

Clonidine can be used as an adjuvant in spinal anesthesia to prolong sensory block.

• A. True
• B. False
• C. Only with morphine co-administration
• D. Not recommended

Answer: (A)

Clonidine, given intrathecally as an adjuvant to spinal anesthesia, prolongs sensory block by activating alpha-2 receptors in the dorsal horn of the spinal cord. This reduces nociceptive transmission and potentiates the effect of the local anesthetic, leading to longer sensory analgesia even without increasing the local anesthetic dose. It does not require morphine co-administration; it can be used with local anesthetic alone to extend the block. While beneficial, it can cause hypotension, bradycardia, and sedation, so dosing must be careful.

Clonidine, given intrathecally as an adjuvant to spinal anesthesia, prolongs sensory block by activating alpha-2 receptors in the dorsal horn of the spinal cord. This reduces nociceptive transmission and potentiates the effect of the local anesthetic, leading to longer sensory analgesia even without increasing the local anesthetic dose. It does not require morphine co-administration; it can be used with local anesthetic alone to extend the block. While beneficial, it can cause hypotension, bradycardia, and sedation, so dosing must be careful.