Equipment: oxygen flush: 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 · Equipment: oxygen flush

Sample item

An anaesthesia machine's oxygen flush delivers oxygen at about what flow?

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

The answer and the reasoning

A. 35 to 75 L/min

The flush bypasses the flowmeters and vaporisers and delivers pure oxygen at pipeline pressure (about 4 bar) at 35 to 75 L/min. Using it during a circle system inspiration phase can cause barotrauma and dilute the volatile agent.

Option by option

  • A. 35 to 75 L/min (correct)

    Correct. The flush gives 35 to 75 L/min.

  • B. 5 to 10 L/min

    5 to 10 L/min is within the range of ordinary flowmeters.

  • C. 1 to 2 L/min

    1 to 2 L/min is a low fresh gas flow.

  • D. 150 to 200 L/min

    150 to 200 L/min is more than the machine supplies.

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 A, 35 to 75 L/min. The flush bypasses the flowmeters and vaporisers and delivers pure oxygen at pipeline pressure (about 4 bar) at 35 to 75 L/min.

Why is "5 to 10 L/min" not the answer?

5 to 10 L/min is within the range of ordinary flowmeters.

Why is "1 to 2 L/min" not the answer?

1 to 2 L/min is a low fresh gas flow.

Why is "150 to 200 L/min" not the answer?

150 to 200 L/min is more than the machine supplies.

What concept does this question test?

It tests Equipment: oxygen flush in Anaesthesia. Using it during a circle system inspiration phase can cause barotrauma and dilute the volatile agent.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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 Equipment: oxygen flush?

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.