Optimization strategy of labor analgesia in obese parturients: dural puncture epidural combined with programmed intermittent epidural bolus / 中华麻醉学杂志

ABSTRACT

Objective:To evaluate the optimization strategy of labor analgesia in obese parturients using dural puncture epidural (DPE) combined with programmed intermittent epidural bolus (PIEB).Methods:Eighty American Society of Anesthesiologists Physical Status classification Ⅰ or Ⅱ obese primiparae, who were at full term with a singleton fetus in vertex presentation, aged 20-40 yr, with body mass index of 30-40 kg/m 2, at 37-42 week gestation, with cervical dilation of 2-5 cm, and with visual analogue scale score ≥50 mm, were divided into 2 groups ( n=40 each) using a random number table method: DPE plus PIEB group (DPEP group) and DPE plus continuous epidural infusion group (DPEC group). All parturients received DPE labor analgesia, and parturients received PIEB (DPEP group) and continuous epidural infusion (DPEC group) to maintain analgesia during labor. In DPEP group, the patient-controlled epidural analgesia pump was set up to deliver a 5 ml bolus dose with a 20-min lockout interval and background infusion at 2 ml/12 min after an initial dose of 8 ml. In DPEC group, the patient-controlled epidural analgesia pump was set up to deliver a 5 ml bolus dose with a 20-min lockout interval and background infusion at 10 ml/h after an initial dose of 8 ml. The analgesia solution contained 0.1% ropivacaine plus 0.3 μg/ml sufentanil. The time to achieve adequate analgesia, consumption of ropivacaine per unit time, height of sensory block at the thoracic vertebral level, modified Bromage score, effective pressing times of patient-controlled analgesia, the number of rescue analgesia, Apgar score, delivery mode, occurrence of adverse reactions and maternal satisfaction with labor analgesia were recorded. Results:Compared with DPEC group, the time to achieve adequate analgesia was significantly shortened, the consumption of ropivacaine per unit time was decreased, and the number of rescue analgesia and effective pressing times of patient-controlled analgesia were decreased in DPEP group ( P<0.05). There were no significant differences in the height of sensory block at the thoracic vertebral level, modified Bromage score, Apgar score, delivery mode, incidence of adverse reactions and maternal satisfaction with labor analgesia between the two groups ( P>0.05). Conclusions:DPE combined with PIEB offers faster onset and better effect and achieves a greater local anesthetics-sparing effect when used for labor analgesia in obese parturients.