What system is used exclusively to remove exhaled anaesthetic gas from a patient?

• A. AGSS system
• B. Ventilation system
• C. Scavenger gas port
• D. Counter-current system

Answer: (A)

Waste anesthetic gases are handled by the anesthesia gas scavenging system. As the patient exhales, some anesthetic vapor escapes into the breathing circuit, and the AGSS captures this excess gas and directs it away from the room to a scavenging plant, using either active suction or a passive gravity-based path. This system is dedicated to removing exhaled anesthetic gas, protecting staff from exposure without interfering with the patient’s ventilation. Other options describe general ventilation (which delivers and removes gases for breathing, not specifically for waste gas), a scavenger port (a component rather than the whole system), or another concept not used for waste gas removal.