The purpose of this study was to investigate the effectiveness of erector spinae plane block on postoperative visceral pain in laparoscopic cholecystectomy (LLC). Given that rectus sheath block may provide sufficient somatic pain block, investigators aimed to investigate whether erector spinae block is effective in visceral pain block.

After induction of general anesthesia, group of patient is decided randomly. In Group R, rectus sheath block is performed with 0.2% Ropivacaine 30ml before the operation. In Group RE, rectus sheath block and erector spinae plane block are performed with 0.2% ropivacaine 70ml before the operation.

NRS score measurement and comparison of the rescue analgesic dose used at 0, 0.5, 1, 2,6, 12, 18, and 24 hours after arrival at the recovery room were collected

Inclusion Criteria:

1. adults between the ages of 20 and 80
2. scheduled laparoscopic cholecystectomy patient
3. American society of anesthesiologists score 1 or 2
4. Patients who have voluntarily agreed in writing to participate in the trial

Exclusion Criteria:

1. Patient with side effects on local anesthetics or steroids
2. Patient who are taboo of peripheral nerve block such as blood clotting disorder, infection, etc.
3. Patients with uncontrolled medical or psychiatric problem
4. Patient does not agree to participate in the study
5. Patients with deformity at vertebra or chest wall.
6. Patients who are pregnant or lactating
7. Patients receiving a single laparoscopic cholecystectomy (including using a robot)
8. Patients with severe intraperitoneal adhesion (higher than Nair s grade 3), or with external drain.