Airway management: transtracheal jet ventilation: 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 · Airway management: transtracheal jet ventilation

Sample item

What is the main danger of jet ventilation through a cricothyroid cannula in complete upper airway obstruction?

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

The answer and the reasoning

A. Barotrauma from gas trapping, with pneumothorax and surgical emphysema

A high-pressure oxygen source (about 4 bar) injects gas through a narrow cannula. Without an open upper airway for expiration, gas becomes trapped and causes lung overdistension, pneumothorax, mediastinal and subcutaneous emphysema. It is therefore used only when there is a route for exhalation or with a low-flow oxygenation approach in a front-of-neck access emergency.

Option by option

  • A. Barotrauma from gas trapping, with pneumothorax and surgical emphysema (correct)

    Correct. Trapped gas leads to barotrauma.

  • B. Hyperkalaemia

    Jet ventilation has no effect on potassium.

  • C. Hypocapnia and alkalosis

    Hypercapnia, not hypocapnia, is the concern.

  • D. Malignant hyperthermia

    Malignant hyperthermia is unrelated to the technique.

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, Barotrauma from gas trapping, with pneumothorax and surgical emphysema. A high-pressure oxygen source (about 4 bar) injects gas through a narrow cannula.

Why is "Hyperkalaemia" not the answer?

Jet ventilation has no effect on potassium.

Why is "Hypocapnia and alkalosis" not the answer?

Hypercapnia, not hypocapnia, is the concern.

Why is "Malignant hyperthermia" not the answer?

Malignant hyperthermia is unrelated to the technique.

What concept does this question test?

It tests Airway management: transtracheal jet ventilation in Anaesthesia. Without an open upper airway for expiration, gas becomes trapped and causes lung overdistension, pneumothorax, mediastinal and subcutaneous emphysema. It is therefore used only when there is a route for exhalation or with a low-flow oxygenation approach in a front-of-neck access emergency.

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 Airway management: transtracheal jet ventilation?

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.