Equipment: Bain circuit: 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: Bain circuit

Sample item

The Bain circuit is a coaxial modification of which Mapleson system?

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

The answer and the reasoning

A. Mapleson D

The Bain circuit has the fresh gas flow tube inside the corrugated expiratory tube, warming the incoming gas and reducing bulk. It is efficient for controlled ventilation with flows of 70 mL/kg/min.

Option by option

  • A. Mapleson D (correct)

    Correct. The Bain is a coaxial Mapleson D.

  • B. Mapleson C

    Mapleson C is the Waters-type circuit.

  • C. Mapleson A

    Mapleson A is the Magill system.

  • D. Mapleson B

    Mapleson B is a rarely used circuit.

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 D. The Bain circuit has the fresh gas flow tube inside the corrugated expiratory tube, warming the incoming gas and reducing bulk.

Why is "Mapleson C" not the answer?

Mapleson C is the Waters-type circuit.

Why is "Mapleson A" not the answer?

Mapleson A is the Magill system.

Why is "Mapleson B" not the answer?

Mapleson B is a rarely used circuit.

What concept does this question test?

It tests Equipment: Bain circuit in Anaesthesia. It is efficient for controlled ventilation with flows of 70 mL/kg/min.

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: Bain circuit?

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.