Mutagenicity of halogenated ether anesthetics

Area of Science:

• Toxicology
• Microbiology
• Pharmacology

Background:

• Anesthetic agents are widely used in medical procedures.
• Assessing the mutagenicity of these agents is crucial for patient and healthcare worker safety.
• Previous studies have not fully evaluated the mutagenic potential of common volatile anesthetics.

Purpose of the Study:

• To evaluate the in vitro mutagenicity of four anesthetic agents: enflurane, methoxyflurane, isoflurane, and fluroxene.
• To determine if these agents pose a genotoxic risk.
• To assess the mutagenic potential of urine from patients anesthetized with these agents.

Main Methods:

• Utilized an in vitro microbial assay system with Salmonella typhimurium strains TA1535 and TA100.
• Tested anesthetic agents at various concentrations (0.01-30% for enflurane, isoflurane, fluroxene; 0.01-7% for methoxyflurane).
• Included liver homogenates from Aroclor 1254-induced rats to assess metabolic activation.

Main Results:

• Enflurane, methoxyflurane, and isoflurane were not mutagenic in the microbial assay.
• Urine samples from patients anesthetized with these agents also showed no mutagenicity.
• Fluroxene exhibited significant mutagenic activity in the assay.

Conclusions:

• Fluroxene is a mutagen and may present a health hazard to operating room personnel and patients.
• Enflurane, methoxyflurane, and isoflurane appear to be non-mutagenic under the tested conditions.
• Further investigation into the genotoxicity of fluroxene is warranted.