Special article: general anesthetic gases and the global environment

Area of Science:

• Environmental Science
• Anesthesiology
• Atmospheric Chemistry

Background:

• Millions of patients annually receive general anesthetics, with widespread use in dental, veterinary, and research settings.
• Current volatile anesthetics are halogenated compounds, while nitrous oxide is a significant ozone-depleting and greenhouse gas.
• Anesthetic gases are exhaled unmetabolized and often released directly into the atmosphere as waste products.

Purpose of the Study:

• To critically review existing data on the environmental effects of general anesthetics.
• To highlight the contribution of anesthetic gases to ozone depletion and global warming.
• To explore potential alternatives and technologies for mitigating anesthetic gas emissions.

Main Methods:

• Literature review of current data on anesthetic gas emissions and environmental impact.
• Analysis of anesthetic consumption data to estimate contributions to total emissions.
• Examination of the properties of halogenated anesthetics and nitrous oxide concerning ozone depletion and global warming.

Main Results:

• Anesthetic use, particularly nitrous oxide, contributes significantly to U.S. emissions (3.0% estimated for nitrous oxide).
• Halogenated anesthetics are potent greenhouse gases, with their relative importance increasing as other ozone-depleting substances decrease.
• Publicly available data on anesthetic gas production and emission is scarce, hindering environmental assessment.

Conclusions:

• General anesthetics pose a non-negligible threat to the global environment through ozone depletion and climate change.
• There is a critical need for greater consideration of the ecotoxicological properties of anesthetic gases.
• Developing and implementing emission-reducing technologies and alternative anesthetic agents is essential.