Monitoring: invasive arterial pressure: 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: invasive arterial pressure

Sample item

Where should the transducer be zeroed for invasive arterial pressure monitoring?

AAt the level of the right atrium (mid-axillary line, fourth intercostal space)BAt the level of the arterial cannulaCAt the level of the earDAt the level of the operating table

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

The answer and the reasoning

A. At the level of the right atrium (mid-axillary line, fourth intercostal space)

Zeroing at the phlebostatic axis exposes the transducer to atmospheric pressure at heart level. For neurosurgical cases in the sitting position the transducer is at the level of the external auditory meatus to estimate cerebral perfusion.

Option by option

A. At the level of the right atrium (mid-axillary line, fourth intercostal space) (correct)
Correct. Heart level is the standard reference.
B. At the level of the arterial cannula
The cannula site would give a position-dependent error.
C. At the level of the ear
Ear level is for cerebral perfusion in sitting patients.
D. At the level of the operating table
The table is not a physiological reference.

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.

Questions about this Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is A, At the level of the right atrium (mid-axillary line, fourth intercostal space). Zeroing at the phlebostatic axis exposes the transducer to atmospheric pressure at heart level.

Why is "At the level of the arterial cannula" not the answer?

The cannula site would give a position-dependent error.

Why is "At the level of the ear" not the answer?

Ear level is for cerebral perfusion in sitting patients.

Why is "At the level of the operating table" not the answer?

The table is not a physiological reference.

What concept does this question test?

It tests Monitoring: invasive arterial pressure in Anaesthesia. For neurosurgical cases in the sitting position the transducer is at the level of the external auditory meatus to estimate cerebral perfusion.

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: invasive arterial pressure?

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.