At what pressure does the oxygen supply trigger the fail-safe valve for N2O and other gases?

• A. 10 psi
• B. 20 psi
• C. 30 psi
• D. 40 psi

Answer: (B)

The oxygen supply triggers the fail-safe valve for nitrous oxide (N2O) and other gases at a pressure of 20 psi. This mechanism is crucial in anesthesia machines as it ensures patient safety by allowing nitrous oxide to flow only when there is adequate oxygen supply. If the oxygen pressure falls below this threshold, the fail-safe valve will automatically cut off the nitrous oxide and other gases, preventing the administration of a potentially dangerous hypoxic mixture. Such safety features are essential in maintaining proper inhalational anesthesia and ensuring that patients receive a sufficient oxygen supply throughout the procedure. Understanding the fail-safe mechanisms and the specific pressures at which they operate is vital for anesthesia providers to ensure safe practice in the operating room.