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• W2091636639 abstract "Several studies have characterized the 50% and 95% effective doses (ED50 and ED95, respectively) of intrathecal sufentanil for labor analgesia.Few have investigated these same criteria for the less expensive alternative, fentanyl. In addition, the ventilatory effects of intrathecal fentanyl at clinically relevant doses are unclear. We performed this study to establish the dose-response relationship of intrathecal fentanyl for both analgesia and ventilatory depression. Ninety parturients in active early labor (<or=to5 cm dilation) received intrathecal fentanyl 5, 7.5, 10, 15, 20, or 25 [micro sign]g in a double-blinded, randomized fashion (n = 15 patients in each group). Parturients were monitored for degree of pain (measured using a 100-mm visual analog pain scale), blood pressure, arterial oxygen saturation (Sao2), respiratory rate, ETCO2, and fetal heart rate 0, 1, 5, 10, 15, 20, 25, and 30 min after the administration of intrathecal fentanyl. An absolute visual analog pain scale score <or=to25 mm was defined a priori as analgesic success. The percentage of parturients who achieved analgesic success was used to construct quantal dose-response curves, from which the ED50 and ED95 values were derived for the total population (mixed parity) and the nulliparous and multiparous subpopulations separately. Overall ED50 and ED95 values (95% CI) were 5.5 (3.4-7.2) and 17.4 (13.8-27.1) [micro sign]g, respectively. Nulliparous values were lower (5.3 and 15.9 [micro sign]g, respectively) than multiparous values (6.9 and 26.0 [micro sign]g, respectively) but were within the 95% CIs of the total population. Pruritus incidence in parturients with analgesic success displayed a dose-response relationship identical to that seen for analgesia. ETCO2 displayed a dose-related increase, particularly at doses >or=to15 [micro sign]g, without concomitant changes in respiratory rate or Sao2, which suggests a decrease in tidal volume. Even in the absence of overt signs or symptoms of somnolence, intrathecal fentanyl at doses within the effective analgesic range induced a change in ventilation that may last longer than the 30-min period we studied. Implications: Intrathecal fentanyl induces rapid and satisfying dose-dependent analgesia in early labor; however, it also produces dose-related decreases in ventilation in the absence of overt somnolence. (Anesth Analg 1999;89:378-83)" @default.
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• W2091636639 date "1999-08-01" @default.
• W2091636639 modified "2023-10-17" @default.
• W2091636639 title "Analgesia, Pruritus, and Ventilation Exhibit a Dose-Response Relationship in Parturients Receiving Intrathecal Fentanyl During Labor" @default.
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• W2091636639 doi "https://doi.org/10.1097/00000539-199908000-00024" @default.
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