Efficacy of wound catheter infusion for postoperative analgesia after single incision laparoscopic cholecystectomy: a randomized controlled trial

INTERVENTION: Intravenous fentanyl PCA with wound catheter infusion of 0.5% levobupivacaine Intravenous fentanyl PCA with wound catheter infusion of normal saline CONDITION: Patients undergoing single incision laparoscopic cholecystectomy PRIMARY OUTCOME: Postoperative visual analog pain score (VAS) SECONDARY OUTCOME: Fentanyl consumption in PCA; Adverse effect; Length of the hospital stay INCLUSION CRITERIA: 1)Over 20 years old 2)Patients undergoing single incision laparoscopic cholecystectomy 3)ASA‐PS 1‐2 4)Obtained written informed consent