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  • Title: [Fentanyl shows different effects by administration routes on bispectral index during spinal anesthesia in patients undergoing cesarean section].
    Author: Kushida A, Murao K, Kimoto M, Nakao S, Shingu K.
    Journal: Masui; 2006 Nov; 55(11):1393-7. PubMed ID: 17131892.
    Abstract:
    BACKGROUND: Spinal anesthesia using a local anesthetic with fentanyl has been reported to induce sedation. We previously reported that the bispectral index (BIS) value was significantly decreased by spinal anesthesia using only bupivacaine and fetanyl after cesarean delivery. In the present study, we studied the effect of different fentanyl administration routes on BIS values during spinal anesthesia for cesarean section. METHODS: Forty-six women scheduled for cesarean section were allocated into five-groups according to the route of fentanyl administration and amount of local anesthetic: intrathecal 0.5% isobaric bupivacaine 2.5 ml plus fentanyl 20 microg (n = 11), intrathecal 0.5% isobaric bupivacaine 2.5 ml plus intravenous fentanyl 100 microg (n = 12), intrathecal 0.5% isobaric bupivacaine 2.5 ml plus epidural fentanyl 100 microg (n = 8), intrathecal 0.5% isobaric bupivacaine 2.5 ml (n = 8), and intrathecal 0.5% isobaric bupivacaine 3.0 ml (n = 7). BIS values were recorded during anesthesia. RESULTS: BIS values in intrathecal fentanyl group were lower than those of other groups (P = 0.03). The cumulative duration of BIS values 80 and below 80 was longer in the intrathecal fentanyl group than those of other groups (P = 0.004). CONCLUSION: The BIS value was significantly decreased only by intrathecal fentanyl for cesarean section.
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