We tested the hypothesis that the addition of 75 μg fentanyl to 0.5% bupivacaine would reduce the onset time of surgical anesthesia for cesarean delivery to equal the onset time of 3% 2-chloroprocaine and would have no effect when added to 3% 2-chloroprocaine. Fentanyl was found to reduce the onset time of bupivacaine to equal the onset time of 2-chloroprocaine and have no effect when added to 2-chloroprocaine.
- epidural onset time
- local anesthetics
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