TAPB Combined With RSB Versus ESPB for Postoperative Analgesia After Laparoscopic Liver Resection

The experimental group received ultrasound-guided erector spinae plane block, and bilateral erector spinae plane block was performed at T7 segment with 20ml 0.375% ropivacaine on each side.While the control group received ultrasound-guided transversus abdominis plane block combined with rectus sheath block, which will be performed under the costal margin with 10ml 0.375% ropivacaine for bilateral transversus abdominis plane block and 10ml 0.375% ropivacaine for bilateral rectus sheath block.