A fresh-gas flow rate of 2 L/min or greater is recommended for administration of sevoflurane because

A fresh-gas flow rate of 2 L/min or greater is recommended for administration of sevoflurane because

• A. The vaporizer cannot accurately deliver the volatile at lesser flow rates
• B. It prevents the formation of fluoride ions
• C. It prevents formation of compound A
• D. It diminishes rebreathing

Answer: (D)

Diminishing rebreathing in a circle anesthesia circuit is the key idea here. When fresh gas flow is low, a portion of the patient's exhaled gas is rebreathed in by the next breath. This means you reintroduce both CO2 and volatile anesthetic back into the inspired gas, making the delivered concentration harder to control and the anesthetic depth more variable. By using a fresh-gas flow of 2 L/min or higher, you flush more of the circuit with fresh gas, reducing the amount of rebreathed gas and helping maintain a stable, predictable concentration of sevoflurane from the circuit. While very low flows can promote compound A formation in the CO2 absorbent and vaporizers have flow-related performance nuances, the primary clinical rationale asked for in this context is the reduced rebreathed gas.

Diminishing rebreathing in a circle anesthesia circuit is the key idea here. When fresh gas flow is low, a portion of the patient's exhaled gas is rebreathed in by the next breath. This means you reintroduce both CO2 and volatile anesthetic back into the inspired gas, making the delivered concentration harder to control and the anesthetic depth more variable. By using a fresh-gas flow of 2 L/min or higher, you flush more of the circuit with fresh gas, reducing the amount of rebreathed gas and helping maintain a stable, predictable concentration of sevoflurane from the circuit.

While very low flows can promote compound A formation in the CO2 absorbent and vaporizers have flow-related performance nuances, the primary clinical rationale asked for in this context is the reduced rebreathed gas.