Which component delivers high-flow oxygen to rapidly fill the reservoir bag or bellows?

Which component delivers high-flow oxygen to rapidly fill the reservoir bag or bellows?

• A. O2 flush button
• B. Pressure regulator
• C. Flowmeter
• D. Vaporizers

Answer: (A)

The ability to rapidly fill the reservoir bag or bellows comes from a direct, high-flow oxygen path that bypasses the usual metering controls. Pressing the oxygen flush opens a valve that sends oxygen straight from the pipeline into the breathing circuit, bypassing the flowmeter and vaporizers. This delivers a very high flow (tens of liters per minute) and quickly inflates the bag or bellows, which is useful for preinduction bagging or purging the circuit. The other components have different roles. The pressure regulator lowers the pipeline pressure to the machine’s working pressure; it isn’t meant to fill the bag quickly. The flowmeter controls the metered fresh gas flow for routine delivery, which is much slower. Vaporizers are used to add volatile anesthetic agents to the carrier gas, not to fill the reservoir rapidly.

The ability to rapidly fill the reservoir bag or bellows comes from a direct, high-flow oxygen path that bypasses the usual metering controls. Pressing the oxygen flush opens a valve that sends oxygen straight from the pipeline into the breathing circuit, bypassing the flowmeter and vaporizers. This delivers a very high flow (tens of liters per minute) and quickly inflates the bag or bellows, which is useful for preinduction bagging or purging the circuit.

The other components have different roles. The pressure regulator lowers the pipeline pressure to the machine’s working pressure; it isn’t meant to fill the bag quickly. The flowmeter controls the metered fresh gas flow for routine delivery, which is much slower. Vaporizers are used to add volatile anesthetic agents to the carrier gas, not to fill the reservoir rapidly.