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H2 antagonists and bupivacaine clearance
G M O'Sullivan1, M Smith, B Morgan
1Department of Anaesthetics, St Thomas' Hospital, London.
Anaesthesia
|February 1, 1988
Summary
H2 receptor antagonists like cimetidine and ranitidine did not affect bupivacaine clearance in women undergoing Caesarean section. This study found no significant differences in peak bupivacaine levels or plasma concentrations.
Area of Science:
- Pharmacology
- Anesthesiology
- Obstetrics
Background:
- H2 receptor antagonists are commonly used for acid suppression.
- Bupivacaine is a widely used local anesthetic in obstetric procedures.
- Understanding drug interactions is crucial for patient safety during surgery.
Purpose of the Study:
- To investigate the impact of H2 receptor antagonists (cimetidine and ranitidine) on bupivacaine clearance.
- To assess potential alterations in bupivacaine pharmacokinetics during epidural anaesthesia for Caesarean section.
Main Methods:
- A randomized controlled trial involving 36 women undergoing elective Caesarean section.
- Participants were allocated to receive placebo, cimetidine, or ranitidine.
- Bupivacaine levels, clearance, and half-life were monitored.
Main Results:
- No significant differences in peak bupivacaine plasma levels were observed between groups.
- H2 receptor antagonists did not alter plasma bupivacaine concentration-time curves.
- Bupivacaine clearance and half-life remained unaffected by cimetidine or ranitidine administration.
Conclusions:
- Cimetidine and ranitidine do not appear to significantly affect bupivacaine pharmacokinetics in women undergoing Caesarean section.
- These findings suggest that co-administration of these H2 receptor antagonists with bupivacaine is likely safe in this patient population.