[Fentanyl induced intraoperative anaphylactic reaction]

Area of Science:

• Anesthesiology
• Clinical Immunology
• Toxicology

Background:

• Fentanyl is a commonly used synthetic opioid analgesic in surgical settings.
• Anaphylactic reactions to opioids, though rare, pose a diagnostic challenge.
• The case involves a previously healthy 12-year-old male with severe head trauma.

Observation:

• The patient experienced rapid hemodynamic instability following two separate fentanyl administrations during surgery.
• The second episode of hemodynamic change was accompanied by the appearance of erythematous skin wheals.
• Clinical diagnosis pointed towards an anaphylactic reaction to fentanyl.

Findings:

• Prick and intradermal skin tests for fentanyl performed six weeks post-event yielded negative results.
• This suggests that negative skin tests do not always rule out opioid-induced anaphylaxis.
• The study highlights the possibility of false-negative results in standard allergy testing for fentanyl.

Implications:

• Clinicians should maintain a high index of suspicion for fentanyl-induced anaphylaxis even with negative skin tests.
• Differentiating opioid-induced anaphylaxis is crucial for identifying causative agents in perioperative adverse events.
• This case underscores the importance of considering clinical presentation over solely relying on skin test results when diagnosing rare drug allergies.