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Likelihood ratios in the diagnosis of renal artery stenosis by magnetic resonance angiography compared with renal angiography.

Abstract：

BACKGROUND:Renal angiography (RA) is considered to be the gold standard for the diagnosis of renal artery stenosis (RAS). However, it is invasive and potentially harmful; hence there is a need for an optimal noninvasive test. Magnetic resonance angiography (MRA) is currently accepted as the optimal noninvasive test by many. However, its major drawback is its inability to grade quantitatively the degree of stenosis. In this study, likelihood ratios (LR) were used to compare the diagnostic accuracy of MRA with that of RA. METHODS:To test the hypothesis that semiquantitatively graded MRA would correlate with RA, a retrospective analysis was performed to determine the LR of MRA to diagnose RAS compared with RA. It was believed that LR > or = 10.0 or < or =0.1 might generate conclusive changes from pretest to post-test probabilities. In this study a total of 94 renal arteries from 48 patients were analyzed for RAS by MRA and RA. Stenoses were graded by MRA as mild (<50%), moderate (50% to 75%), or severe (>75%); and by RA as <75% or > or =75% stenosis. RESULTS:The LR was 0.13 (95% CI = 0.09 to 0.19) for mild stenosis, 0.11 (95% CI = 0.08 to 0.15) for moderate stenosis, and 2.2 (95% CI = 1.9 to 3.1) for severe stenosis by MRA. CONCLUSIONS:Nonsevere stenosis can be sufficiently diagnosed by MRA and may not warrant RA. However, it may be insufficiently precise to establish severe RAS based on LR results. Therefore, for severe RAS by MRA, the decision to obtain RA can be made with the help of post-test probability, which is determined using pretest probability and LR.

journal_name

Am J Hypertens

journal_title

American journal of hypertension

authors

Attallah N,Yee J,Gutierrez A,Musial J,Parasuraman R

doi

10.1016/j.amjhyper.2003.07.016

subject

Has Abstract

pub_date

2003-12-01 00:00:00

pages

987-92

issue

12

eissn

0895-7061

issn

1941-7225

pii

S0895706103010781

journal_volume

16

pub_type

杂志文章

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