Nitrous oxide does not impair hepatic function in young or old surgical patients

Area of Science:

• Anesthesiology
• Hepatology
• Geriatric Medicine

Background:

• Nitrous oxide (N2O) is a common anesthetic agent.
• Concerns exist regarding potential N2O-induced hepatic injury, particularly in elderly patients.
• The impact of N2O on liver function requires further investigation.

Purpose of the Study:

• To determine if anesthesia including nitrous oxide (N2O) causes hepatic injury.
• To assess if patient age influences any adverse effects of N2O on the liver.
• To evaluate the safety profile of N2O in different age groups undergoing surgery.

Main Methods:

• A randomized controlled trial involving 100 patients undergoing total hip replacement.
• Patients received regional anesthesia supplemented with isoflurane and intravenous adjuvants, with or without N2O (50%-60%).
• Postoperative assessment of hepatic function using plasma levels of alanine aminotransferase, bilirubin, and alkaline phosphatase at 1 and 3 days.

Main Results:

• No statistically significant difference in liver function indicators was observed between groups receiving N2O and those not.
• N2O administration did not correlate with increased levels of liver enzymes or bilirubin.
• These results were consistent across both younger and older patient cohorts.

Conclusions:

• Anesthesia incorporating nitrous oxide does not appear to cause hepatic injury in patients undergoing total hip replacement.
• Patient age does not modify the hepatic safety profile of nitrous oxide.
• N2O can be considered safe regarding liver function in the studied patient population.