Abstract
The purpose of this study was to determine if epidural fentanyl produces analgesia in laboring patients by a primary spinal or supraspinal action. Fifty-four parturients were randomized to receive epidural 0.125% bupivacaine plus one of three treatments: epidural saline-intravenous saline, epidural fentanyl (20 microg/h)-intravenous saline, or epidural saline-intravenous fentanyl (20 microg/h). The study treatments were administered by continuous infusion, whereas epidural bupivacaine use was patient controlled. Epidural bupivacaine use was significantly reduced by epidural (11.5+/-4.6 ml/h) but not by intravenous fentanyl (15.9+/-4.5 ml/h) compared with saline control (16+/-5.9 ml/ h). Analgesia characteristics and side effects were similar among groups. Low-dose epidural infusions of fentanyl produce labor analgesia by a primary spinal action.
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