Monitoring and anaesthesia workstation: curriculum recognition: practice question

A Anaesthesia question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Anaesthesia · Monitoring and anaesthesia workstation: curriculum recognition

Sample item

A pressure-sensitive component of an anaesthesia machine sounds an alarm and cuts off nitrous oxide when the supply of the vital gas drops. What is this component?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

B. Oxygen supply failure protection device

The oxygen supply failure protection device senses falling oxygen supply pressure, gives an audible warning and cuts off or reduces nitrous oxide and other gases. It stops a hypoxic mixture being delivered when the oxygen source fails. It is separate from the pin index system, which prevents cylinder misconnection.

Option by option

  • A. Pressure-relief (pop-off) valve

    A pop-off valve vents excess pressure from the circuit; it does not respond to supply failure.

  • B. Oxygen supply failure protection device (correct)

    Correct. It alarms and shuts off nitrous oxide when oxygen supply pressure falls.

  • C. Pin index safety system

    The pin index safety system prevents a cylinder being fitted to the wrong yoke.

  • D. Oxygen flush valve

    The flush valve delivers a high flow of oxygen on demand and has no alarm function.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is B, Oxygen supply failure protection device. The oxygen supply failure protection device senses falling oxygen supply pressure, gives an audible warning and cuts off or reduces nitrous oxide and other gases.

Why is "Pressure-relief (pop-off) valve" not the answer?

A pop-off valve vents excess pressure from the circuit; it does not respond to supply failure.

Why is "Pin index safety system" not the answer?

The pin index safety system prevents a cylinder being fitted to the wrong yoke.

Why is "Oxygen flush valve" not the answer?

The flush valve delivers a high flow of oxygen on demand and has no alarm function.

What concept does this question test?

It tests Monitoring and anaesthesia workstation: curriculum recognition in Anaesthesia. It stops a hypoxic mixture being delivered when the oxygen source fails. It is separate from the pin index system, which prevents cylinder misconnection.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Monitoring and anaesthesia workstation: curriculum recognition?

Make a table of each agent, its key advantage and its main side effect. Then use the flashcards and the other Anaesthesia questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.