Πέμπτη 17 Αυγούστου 2017

Comparative efficacy of minimal concentration of racemic bupivacaine (0.0625%) with fentanyl and ropivacaine (0.1%) with fentanyl for epidural labor analgesia

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TN Chethanananda, MR Shashank, N Madhu, J Achyutha, Karna Venkata Siva Kumar

Anesthesia: Essays and Researches 2017 11(3):583-588

Background and Aims: This study aims to compare the minimum effective concentration of local anesthetic (LA) bupivacaine and ropivacaine with highly lipid soluble opioids fentanyl for providing optimal labor epidural analgesia. Settings and Design: The objective of this study was to evaluate the efficacy of racemic bupivacaine 0.0625% and 0.1% of ropivacaine both mixed with 2 μg/ml of fentanyl for epidural labor analgesia in parturients with spontaneous labor and normal fetal heart rate tracing. Methodology: Sixty parturients requesting for labor analgesia were divided into two groups. Group B (n = 30) received racemic bupivacaine (0.0625%) and fentanyl 2 μg/ml of 10 ml and Group R (n = 30) received ropivacaine (0.1%) and fentanyl 2 μg/ml. In both groups, the drug was given in 5 ml fractionated doses at 5 min interval. Parturients not experiencing analgesia within 15 min of initial bolus were supplemented with additional 5 ml of the same concentration of the solution. Epidural analgesia was maintained by timed top ups at the end of 90 min with the dosage equal to the initial dose of the drug. Duration of labor analgesia, motor block, visual analog scale, maternal hemodynamic parameters, mode of delivery, and maternal satisfaction was assessed. Statistical Analysis: Data were analyzed with odds variance, unpaired t-test, and Chi-square tests. P < 0.05 was considered statistically significant. Results: In our study, results indicate that both drugs were equally effective clinically. Maternal demographic characteristics were comparable. There were no statistically significant differences in visual analog pain score, highest sensory block, maternal satisfaction, mode of delivery, total dose of LAs during labor and motor block at delivery between the groups. Conclusions: In our study, both the drugs produced equivalent analgesia for labor at low concentration when used with highly lipid soluble opioid such as fentanyl.

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