Which volatile anesthetic undergoes the greatest degree of metabolism?

Which volatile anesthetic undergoes the greatest degree of metabolism?

• A. Enflurane
• B. Isoflurane
• C. Halothane
• D. Desflurane

Answer: (C)

Volatile anesthetics differ in how much is processed by the liver, and this metabolic rate is tied to toxicity risks. Halothane undergoes the greatest metabolism among these agents, with roughly a fifth to a quarter of the dose being metabolized in the liver. The metabolites, especially trifluoroacetyl compounds, can bind liver proteins and trigger an immune-mediated hepatitis in susceptible individuals. In contrast, enflurane, isoflurane, and desflurane are metabolized only sparingly (a few percent or less, with desflurane being the least), so their hepatic toxicity risk is much lower. This is why halothane is the correct answer.

Volatile anesthetics differ in how much is processed by the liver, and this metabolic rate is tied to toxicity risks. Halothane undergoes the greatest metabolism among these agents, with roughly a fifth to a quarter of the dose being metabolized in the liver. The metabolites, especially trifluoroacetyl compounds, can bind liver proteins and trigger an immune-mediated hepatitis in susceptible individuals. In contrast, enflurane, isoflurane, and desflurane are metabolized only sparingly (a few percent or less, with desflurane being the least), so their hepatic toxicity risk is much lower. This is why halothane is the correct answer.