no enrollment

To compare postoperative pain, opioid consumption and chronic pain in patients undergoing to hernia repair surgery after receiving nitrous oxide or oxygen during the general anesthesia.

The study is prospective and double blind. In the clinic, patients undergoing inguinal hernia surgery that meet the criteria for inclusion into the study and agreed to participate in the study will be randomized into two groups. In the first group of patients will receive Nitrous Oxide and In the second group of patients will receive oxygen during the general anesthesia.

Inclusion Criteria:

• 18 to 65 years old at time of the first procedure
• American Society of Anesthesiologists physical status I or II
• Inguinal hernia repair surgery undergoing the general anesthesia

Exclusion Criteria:

• Neuropathic disease
• Chronic opioid users
• Contraindication for Nitrous Oxide receive
• Consent will not be obtained patient
• Psychiatric disorders
• Current or recent drug abuse (within past 6 months).