Equipment: Mapleson circuits: 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: Mapleson circuits

Sample item

Which Mapleson circuit is the most efficient for spontaneous ventilation?

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

The answer and the reasoning

A. Mapleson A (Magill)

In the Magill system fresh gas flow of about 70% of minute ventilation prevents rebreathing during spontaneous breathing. Mapleson D, E and F are more efficient for controlled ventilation.

Option by option

  • A. Mapleson A (Magill) (correct)

    Correct. Mapleson A is best for spontaneous breathing.

  • B. Mapleson D

    Mapleson D is best for controlled ventilation.

  • C. Mapleson C

    Mapleson C is inefficient.

  • D. Mapleson E

    Mapleson E is similar to D without a bag.

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, Mapleson A (Magill). In the Magill system fresh gas flow of about 70% of minute ventilation prevents rebreathing during spontaneous breathing.

Why is "Mapleson D" not the answer?

Mapleson D is best for controlled ventilation.

Why is "Mapleson C" not the answer?

Mapleson C is inefficient.

Why is "Mapleson E" not the answer?

Mapleson E is similar to D without a bag.

What concept does this question test?

It tests Equipment: Mapleson circuits in Anaesthesia. Mapleson D, E and F are more efficient for controlled ventilation.

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 Equipment: Mapleson circuits?

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.