Radiotherapy and nuclear medicine basics: pharmacological stress agent: practice question

A Radiology 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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Radiology · Radiotherapy and nuclear medicine basics: pharmacological stress agent

Sample item

A patient with severe active asthma cannot exercise and needs stress myocardial perfusion imaging. Which stress agent is preferred?

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

The answer and the reasoning

B. Dobutamine

Adenosine and dipyridamole act through adenosine receptors and can precipitate bronchospasm, so they are avoided in active reactive airway disease. Dobutamine increases heart rate and contractility and is the usual alternative. Aminophylline is used to reverse the effect of vasodilators, not to stress the heart.

Option by option

  • A. Dipyridamole

    Dipyridamole raises adenosine levels and can cause bronchospasm.

  • B. Dobutamine (correct)

    Correct. Dobutamine does not act on adenosine receptors and does not provoke bronchospasm.

  • C. Aminophylline

    Aminophylline is an antagonist used to reverse vasodilator stress.

  • D. Adenosine

    Adenosine can cause severe bronchospasm.

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 Radiology question

What is the answer to this Radiology question?

The best answer is B, Dobutamine. Adenosine and dipyridamole act through adenosine receptors and can precipitate bronchospasm, so they are avoided in active reactive airway disease.

Why is "Dipyridamole" not the answer?

Dipyridamole raises adenosine levels and can cause bronchospasm.

Why is "Aminophylline" not the answer?

Aminophylline is an antagonist used to reverse vasodilator stress.

Why is "Adenosine" not the answer?

Adenosine can cause severe bronchospasm.

What concept does this question test?

It tests Radiotherapy and nuclear medicine basics: pharmacological stress agent in Radiology. Dobutamine increases heart rate and contractility and is the usual alternative. Aminophylline is used to reverse the effect of vasodilators, not to stress the heart.

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 Radiotherapy and nuclear medicine basics: pharmacological stress agent?

Learn signs with the image, and the disease they point to. Then use the flashcards and the other Radiology 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.