Drug design, development and therapy
Effective Dose 90 of Programmed Intermittent Epidural Bolus Volume at Three Ropivacaine Concentrations with Dural Puncture Epidural for Labor Analgesia: A Randomized Sequential Allocation Study
By Sun L, Ding X, Zhai P and 3 others.
Abstract
Background
This study aimed to explore the ED90 of programmed intermittent epidural bolus (PIEB) volume for labor analgesia with different concentrations of ropivacaine when combining with dural puncture epidural (DPE) techniques.
Methods
Ninety patients were randomized to three groups (n=30 each) to receive an initial 12-mL bolus of ropivacaine (0.075%, 0.1%, or 0.125%) with 0.3 μg/mL sufentanil. PIEB began at 60 min after the initial bolus, with 45-min intervals; the first patient in each group received 10 mL ropivacaine‑sufentanil solution, and subsequent volumes were adjusted by ± 2 mL via sequential allocation based on effective labor analgesia (no epidural bolus intervention administered). The primary and secondary outcomes were, respectively, the ED90 of PIEB volume at different ropivacaine concentrations for effective labor analgesia, and maternal analgesia quality and neonatal outcomes.