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首页> 外文期刊>Radiology >Hemodynamic significance of renal artery stenosis: digital subtraction angiography versus systolically gated three-dimensional phase-contrast MR angiography.
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Hemodynamic significance of renal artery stenosis: digital subtraction angiography versus systolically gated three-dimensional phase-contrast MR angiography.

机译：肾动脉狭窄的血流动力学意义：数字减影血管造影与收缩门控三维相差MR血管造影。

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PURPOSE: To compare digital subtraction angiography with three-dimensional phase-contrast magnetic resonance (MR) angiography in detection of significant renal artery stenosis. MATERIALS AND METHODS: Sixteen patients underwent digital subtraction angiography and systolically gated three-dimensional phase-contrast MR angiography within 1 week. Scoring of stenosis on MR angiograms was based on presence and length of a flow void and quality of flow signal intensity in the distal part of the artery. Intraarterial pressure measurement was the reference standard for hemodynamically significant renal artery stenosis. RESULTS: MR angiography depicted two of five patent accessory arteries. Comparison of digital subtraction angiography and MR angiography with intraarterial pressure measurements was possible in 25 main renal arteries. In 13 arteries, a pressure gradient of more than 15 mm Hg was found. Digital subtraction angiography depicted 10 of these stenoses (sensitivity, 77%; specificity, 92%). A flow void was present at MR angiography in eight stenoses (sensitivity, 62%; specificity, 83%). In 12 of the stenosed vessels, distal flow signal intensity was impaired at MR angiography (sensitivity, 92%; specificity, 75%). There was no difference between the two modalities (P > .05) in grading hemodynamic significance of renal artery stenosis. CONCLUSION: Systolically gated MR angiography and digital subtraction angiography are equally effective in depicting hemodynamically significant stenoses in the main renal arteries. MR angiography, however, is not adequate in depiction of accessory renal arteries.
机译：目的：比较数字减影血管造影与三维相衬磁共振（MR）血管造影在检测重大肾动脉狭窄中的作用。材料与方法：16例患者在1周内进行了数字减影血管造影，并进行了收缩门控的三维相差MR血管造影。 MR血管造影照片上狭窄的评分基于动脉远端的血流空隙的存在和长度以及血流信号强度的质量。动脉内压测量是血液动力学显着的肾动脉狭窄的参考标准。结果：MR血管造影描绘了五个专利附属动脉中的两个。在25条主要的肾动脉中，数字减影血管造影和MR血管造影与动脉内压测量的比较是可能的。在13条动脉中，发现压力梯度超过15毫米汞柱。数字减影血管造影描述了这些狭窄中的10个（敏感性为77％;特异性为92％）。在MR血管造影术中，有8个狭窄处存在流空（敏感性为62％;特异性为83％）。在12个狭窄的血管中，在MR血管造影时远端血流信号强度减弱（敏感性为92％;特异性为75％）。两种方式在肾动脉狭窄的血流动力学显着性分级上没有差异（P> .05）。结论：收缩门控MR血管造影和数字减影血管造影在描绘主要肾动脉血流动力学显着狭窄方面同样有效。然而，MR血管造影不足以描绘辅助肾动脉。

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