Nystagmus caused by epidural fentanyl

Area of Science:

• Anesthesiology
• Neurology
• Pharmacology

Background:

• Opioids are frequently used for pain management in surgical settings.
• Common opioid side effects like nausea and pruritus are well-documented.
• Neurologic complications are rare, with sedation being the most common.

Observation:

• A case report details a 73-year-old woman experiencing vertical nystagmus after epidural fentanyl administration.
• This is the first reported instance of nystagmus linked to epidural fentanyl.
• Previous reports associated nystagmus with epidural morphine, not fentanyl.

Findings:

• Epidural fentanyl, even within standard doses, can induce nystagmus as a rare neurologic adverse event.
• The nystagmus observed in this case was predominantly vertical.
• This complication, while rare, is a potential side effect of epidural fentanyl.

Implications:

• Clinicians should be aware of the potential for nystagmus following epidural fentanyl.
• Nystagmus post-epidural fentanyl may be benign but warrants careful evaluation.
• In patients with risk factors (age, hypertension, diabetes, cerebrovascular disease), nystagmus could indicate serious CNS pathology.