Abstract
Re retrospectively studied. Predictors associated with failure of extension of epidural analgesia in the presence of adequate time for onset of epidural anesthesia were identified by univariate logistic regression. Of the 1025 parturients, 1.7% had failed epidural extension. Predictors of failed epidural anesthesia included initiation of labor analgesia with plain epidural technique (compared to combined spinal-epidural) (P = 0.001), ≥2 episodes of breakthrough pain during labor (P < 0.001) and prolonged duration of neuraxial labor analgesia (P = 0.02)....

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