Nuclear medicine: captopril renography: 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.

Try it

Radiology · Nuclear medicine: captopril renography

Sample item

A young woman has resistant hypertension and a suspected unilateral renal artery stenosis. On captopril renography, what is the characteristic finding in the affected kidney?

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

The answer and the reasoning

B. A fall in uptake and delayed excretion after captopril compared with the baseline study

In renal artery stenosis, glomerular filtration depends on angiotensin II constriction of the efferent arteriole. An ACE inhibitor removes that support and the affected kidney's function drops, shown as a worse renogram curve.

Option by option

  • A. Bilateral symmetrical improvement

    Improvement would not occur in the affected side.

  • B. A fall in uptake and delayed excretion after captopril compared with the baseline study (correct)

    Correct. Captopril unmasks the dependence of GFR on angiotensin II.

  • C. Unchanged curves, which confirms stenosis

    Unchanged curves would argue against functionally significant stenosis.

  • D. Increased glomerular filtration after captopril

    GFR falls in the stenosed kidney because efferent tone is lost.

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.

More Radiology questions

Questions about this Radiology question

What is the answer to this Radiology question?

The best answer is B, A fall in uptake and delayed excretion after captopril compared with the baseline study. In renal artery stenosis, glomerular filtration depends on angiotensin II constriction of the efferent arteriole.

Why is "Bilateral symmetrical improvement" not the answer?

Improvement would not occur in the affected side.

Why is "Unchanged curves, which confirms stenosis" not the answer?

Unchanged curves would argue against functionally significant stenosis.

Why is "Increased glomerular filtration after captopril" not the answer?

GFR falls in the stenosed kidney because efferent tone is lost.

What concept does this question test?

It tests Nuclear medicine: captopril renography in Radiology. An ACE inhibitor removes that support and the affected kidney's function drops, shown as a worse renogram curve.

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 Nuclear medicine: captopril renography?

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.