Lidocaine Patch for Postoperative Analgesia After Laparoscopic Cholecystectomy

The investigators hypothesized that application of a 5% lidocaine patch would be associated with reduced pain scores after operation compared with placebo patch in patients undergoing laparoscopic cholecystectomy.

• The 5% lidocaine patch have been approved for the treatment of postherpetic neuralgia.
• The investigators hypothesized that application of a 5% lidocaine patch would be associated with reduced pain scores, pain controlled drug(opioids, NSAID) in post operative period.

Inclusion Criteria:

• patients of ASA Ⅰ-Ⅱ
• aged 18~65
• scheduled to undergo elective laparoscopic cholecystectomy under general anesthesia.

Exclusion Criteria:

• patients with chronic pain
• patients with taking regular analgesics
• patients with allergy to ketorolac or lidocaine