Occupational exposure to nitrous oxide in four hospitals

Area of Science:

• Occupational Health
• Environmental Health
• Anesthesiology

Background:

• Nitrous oxide (N2O) is a common anesthetic gas used in operating rooms.
• Potential health risks associated with chronic exposure to anesthetic gases exist for healthcare professionals.
• Effective control measures are necessary to minimize staff exposure in surgical environments.

Purpose of the Study:

• To quantify the exposure levels of operating theatre staff to nitrous oxide.
• To assess the effectiveness of existing ventilation and scavenging systems in controlling N2O exposure.
• To highlight the need for improved pollution control measures in surgical settings.

Main Methods:

• Utilized diffusive samplers to measure nitrous oxide (N2O) exposure.
• Monitored anaesthetists, anaesthetic assistants, and circulating nurses in four Glasgow hospitals.
• Conducted surveys in each operating theatre over 1-2 week periods, sampling during all operating sessions.

Main Results:

• Observed generally high levels of nitrous oxide exposure for all monitored staff.
• Anaesthetists' exposure exceeded 50 ppm on approximately 50% of sampling occasions.
• Indicated potential deficiencies in the maintenance and utilization of theatre ventilation and scavenging systems.

Conclusions:

• The study underscores the significant and often underestimated exposure of operating theatre staff to nitrous oxide.
• Emphasizes the critical importance of maintaining and effectively using theatre ventilation and gas scavenging systems.
• Recommends regular monitoring of staff exposure to verify the efficacy of implemented pollution control strategies.