An active waste gas scavenging system is installed in an operating theatre. Within this system, the interface sits between the collection tubing from the breathing circuit and the disposal route. What is the primary function of the interface?
- A To protect the circuit from excessive positive or negative pressures generated by the disposal system ✓
- B To measure the concentration of volatile agent in the waste gas
- C To filter bacteria from the exhaled gases before discharge
- D To regulate the flow of driving gas to the ventilator bellows
Correct answer: A. To protect the circuit from excessive positive or negative pressures generated by the disposal system
Explanation
The interface is the safety component of a scavenging system. It contains relief valves and, in passive systems, reservoir bags that prevent high positive pressure from the disposal line being transmitted to the patient circuit, which would cause barotrauma, and prevent negative suction pressure from entraining circuit gas, which would cause deflation of the lungs or reservoir bag. Gas measurement, bacterial filtration, and ventilator drive regulation are functions of other components entirely.
Reference: Miller's Anesthesia, 9th ed.
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Written and medically reviewed by the StethoPrep medical team.