Cardiovascular physiology, fluids, and blood management: curriculum recognition: 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 · Cardiovascular physiology, fluids, and blood management: curriculum recognition

Sample item

A patient has a mean arterial pressure of 90 mmHg, a central venous pressure of 10 mmHg and a cardiac output of 5 L/min. What is the systemic vascular resistance?

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

The answer and the reasoning

A. 1280 dyn.s/cm5

Systemic vascular resistance is (MAP minus CVP) divided by cardiac output, multiplied by 80. Here (90 - 10) / 5 x 80 gives 1280 dyn.s/cm5, which is within the normal range of about 800 to 1200 and slightly raised.

Option by option

  • A. 1280 dyn.s/cm5 (correct)

    Correct. (90 - 10) divided by 5, then x 80, gives 1280.

  • B. 1440 dyn.s/cm5

    This omits the central venous pressure from the numerator.

  • C. 1600 dyn.s/cm5

    This adds the central venous pressure instead of subtracting it.

  • D. 800 dyn.s/cm5

    This would need a cardiac output of 8 L/min and does not follow from the figures.

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, 1280 dyn.s/cm5. Systemic vascular resistance is (MAP minus CVP) divided by cardiac output, multiplied by 80.

Why is "1440 dyn.s/cm5" not the answer?

This omits the central venous pressure from the numerator.

Why is "1600 dyn.s/cm5" not the answer?

This adds the central venous pressure instead of subtracting it.

Why is "800 dyn.s/cm5" not the answer?

This would need a cardiac output of 8 L/min and does not follow from the figures.

What concept does this question test?

It tests Cardiovascular physiology, fluids, and blood management: curriculum recognition in Anaesthesia. Here (90 - 10) / 5 x 80 gives 1280 dyn.s/cm5, which is within the normal range of about 800 to 1200 and slightly raised.

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 Cardiovascular physiology, fluids, and blood management: curriculum recognition?

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.