关键词: 神经传导阻滞 , 超声检查, 术后镇痛

Abstract: Objective To evaluate the effect of ultrasound-guided external oblique plane block (EOP) on postoperative analgesia in patients undergoing upper abdominal surgery. 
Methods In total, 120 patients receiving elective upper abdominal surgery were selected and divided into three groups(n=40): control group, low anterior serratus plane block (SSPB) group and EOP group according to random number table method. After induction of general anesthesia, SSPB group received ultrasound-guided anterior serratus plane block at the 8th rib level of bilateral axillary midline, and EOP group received ultrasound-guided EOP at the 6th rib level of bilateral clavicular midline, with 30 mL of 0.25% ropivacaine injected. The three groups were treated with general anesthesia, endotracheal intubation, intraoperative static inhalation combined anesthesia, and patient controlled intravenous analgesia (PCIA) with sufentanil after operation, to maintain the clinical effective analgesia within 48 h after operation. When the visual analogue scale (VAS) pain score was ≥ 4, the PCIA pump was pressed. When the effect was poor, intravenous sufentanil 0.1 μg/kg was injected. The dosage of sufentanil during operation and within 48 h after operation, the time to first PCIA, times of PCIA compression and times of remedial analgesia, and the occurrence of nausea, vomiting and other adverse reactions within 48 h after operation were recorded. The completion time of nerve block was recorded. 
Results Compared with control group, the time to first PCIA in EOP group and SSPB group was prolonged, the dosage of sufentanil during operation and within 48 h after operation, the times of remedial analgesia and pump compression were significantly reduced, and the incidence of adverse reactions was significantly reduced (P < 0.05). The completion time of nerve block in EOP group was significantly shorter than that in SSPB group. 
Conclusion Ultrasound-guided EOP is effective in postoperative analgesia, with fewer adverse reactions in patients undergoing upper abdominal surgery. 

Key words: nerve block, ultrasonography, postoperative analgesia