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Obstetric Anesthesia
Anesthesia and Pain Medicine 2010;5(3):249-254.
Published online July 31, 2010.
The onset and duration of 0.2% ropivacaine with a varying dose of fentanyl in epidural labor analgesia
Eun Chi Bang, Jee Hyun Shin, Hyun Sook Lee, Yong In Kang, Kyung Sook Cho, Su Yeon Kim
Department of Anesthesia and Pain Medicine, Kangnam Cha Hospital, College of Medicine, CHA University, Seoul, Korea. ecbang63@hanmail.net
Abstract
BACKGROUND
The purpose of this study was to identify the effect of fentanyl dose on the onset and duration of 0.2% ropivacaine.
METHODS
Sixty-one nulliparous women with singleton vertex pregnancy who requested epidural labor analgesia were enrolled. Patients were administered randomly 0, 50, 100microgram of fentanyl with 10 ml of 0.2% ropivacaine (Group F0, F50 and F100, respectively). VAS pain scores were recorded 0, 5, 10, 15 min after epidural injection, after which they were recorded every 15 min. The onset and duration of analgesia were measured. Side effects such as, pruritus, motor blockade, and hypotension were recorded.Satisfaction scores, type of delivery, and neonatal outcomes were recorded.
RESULTS
The onset of analgesia was at 8.5 +/- 3.4 min in Group F100, compared with 13.7 +/- 7.2 min in Group F0 and 13.6 +/- 5.3 min in Group F50 (P = 0.009). The duration of analgesia was 122.6 +/- 20 min in Group F100, compared with 72.3 +/- 21.2 min in Group F0 and 97.8 +/- 22.4 min in Group F50 (P = 0.000). There were significant differences in VAS pain scores and satisfaction scores among the three groups. There were no differences in the incidences of maternal side effects and operative delivery or neonatal outcomes.
CONCLUSION
Fentanyl 100microgram was the most appropriate dose when combined with 0.2% ropivacaine due to the rapid onset and long duration of epidural labor analgesia.
Key Words: Duration, Epidural labor analgesia, Fentanyl, Onset, 0.2% Ropivacaine
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