After induction and intubation, if the O2 saturation falls and the pipeline oxygen pressure is 65 psi while the machine’s O2 tank reads 2100 psi, what is the next appropriate step?

After induction and intubation, if the O2 saturation falls and the pipeline oxygen pressure is 65 psi while the machine’s O2 tank reads 2100 psi, what is the next appropriate step?

• A. Exchange the tank
• B. Switch the O2 line with N2O line
• C. Disconnect the O2 line from the hospital source
• D. Extubate and start mask ventilation

Answer: (C)

Oxygen delivery comes from two sources on an anesthesia machine: the hospital pipeline and the O2 cylinder. When a patient desaturates, the fastest way to ensure a reliable oxygen supply is to isolate the suspected problem in the hospital line and rely on the machine’s backup O2 source, provided the cylinder is full and ready. In this scenario the pipeline O2 pressure is 65 psi (generally acceptable) but the patient isn’t getting adequate oxygen, while the O2 cylinder shows about 2100 psi, indicating a ready backup source. Disconnecting the O2 line from the hospital source removes any potential fault or cross-connection in the pipeline, allowing the machine to draw oxygen from the cylinder and restore oxygen delivery to the patient while you assess and fix the hospital supply. Exchanging the cylinder isn’t necessary since one is already full and available. Swapping the gas lines with N2O would be dangerous and is not appropriate. Extubating and starting mask ventilation would abandon the airway and is not indicated here.

Oxygen delivery comes from two sources on an anesthesia machine: the hospital pipeline and the O2 cylinder. When a patient desaturates, the fastest way to ensure a reliable oxygen supply is to isolate the suspected problem in the hospital line and rely on the machine’s backup O2 source, provided the cylinder is full and ready.

In this scenario the pipeline O2 pressure is 65 psi (generally acceptable) but the patient isn’t getting adequate oxygen, while the O2 cylinder shows about 2100 psi, indicating a ready backup source. Disconnecting the O2 line from the hospital source removes any potential fault or cross-connection in the pipeline, allowing the machine to draw oxygen from the cylinder and restore oxygen delivery to the patient while you assess and fix the hospital supply.

Exchanging the cylinder isn’t necessary since one is already full and available. Swapping the gas lines with N2O would be dangerous and is not appropriate. Extubating and starting mask ventilation would abandon the airway and is not indicated here.