Opioid Induced Hyperalgesia with Intrathecal Infusion of High-Dose Fentanyl

Area of Science:

• Pain Medicine
• Neuroscience
• Pharmacology

Background:

• Opioid-induced hyperalgesia (OIH) is a paradoxical increase in pain sensitivity associated with opioid use.
• Despite extensive literature since 1943, the exact etiology of OIH remains elusive.
• OIH has been observed in diverse clinical settings and with various opioid administrations.

Observation:

• A 60-year-old patient on chronic intrathecal fentanyl and bupivacaine experienced escalating pain.
• The patient's pain worsened with increased opioid doses.
• Pain significantly improved after the discontinuation of intrathecal opioids.

Findings:

• This case presents opioid-induced hyperalgesia in a patient receiving intrathecal fentanyl.
• This represents the first reported instance of OIH specifically linked to intrathecal fentanyl administration.
• The findings suggest intrathecal fentanyl can induce hyperalgesia, contributing to the OIH literature.

Implications:

• Highlights the potential for intrathecal fentanyl to cause OIH, a previously unreported association.
• Underscores the importance of recognizing and managing OIH in patients receiving chronic intrathecal opioid therapy.
• Suggests a need for further investigation into the mechanisms of OIH with intrathecal opioids.