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Opioid-induced rigidity after intravenous fentanyl
1Department of Anesthesiology, University of Utah School of Medicine, Salt Lake City, USA.
Obstetrics and Gynecology
|May 1, 1997
Summary
Opioid administration can cause severe muscle rigidity and breathing difficulties. This case highlights potential risks in pregnant patients, especially when combined with certain psychiatric medications.
Area of Science:
- Anesthesiology
- Pharmacology
- Obstetrics
Background:
- Intravenous opioids, particularly at high doses, can induce severe rigidity and impair ventilation.
- The underlying mechanism is thought to involve neuraxis dopamine antagonism.
- Rigidity following analgesic doses of fentanyl is not a commonly reported adverse effect.
Observation:
- A pregnant patient undergoing evaluation for vaginal bleeding received intravenous fentanyl.
- The patient was also receiving haloperidol for pre-existing psychiatric conditions.
- Administration of fentanyl resulted in severe rigidity affecting extremities and the trunk, compromising ventilation.
Findings:
- Opioid administration can lead to significant muscle rigidity and respiratory compromise.
- Pregnancy may alter analgesic requirements and susceptibility to opioid side effects.
- Concomitant use of butyrophenones, like haloperidol, may increase the risk of opioid-induced rigidity.
Implications:
- Clinicians should be aware of the potential for opioid-induced rigidity, especially in pregnant patients.
- Careful consideration of opioid dosage and potential drug interactions is crucial in obstetric anesthesia.
- This case underscores the importance of monitoring respiratory function during and after opioid administration in susceptible populations.