Effects of local anesthetic on the time between analgesic boluses and the duration of labor in patient-controlled epidural analgesia: prospective study of two ultra-low dose regimens of ropivacaine and sufentanil

Abstract

Patient-controlled epidural analgesia with low concentrations of anesthetics is effective in reducing labor pain. The aim of this study was to assess and compare two ultra-low dose regimens of ropivacaine and sufentanil (0.1% ropivacaine plus 0.5 μg.ml-1 sufentanil vs. 0.06% ropivacaine plus 0.5 μg.ml-1 sufentanil) on the intervals between boluses and the duration of labor