<abstract xmlns="http://www.w3.org/1999/xhtml"><sec id="j_1905-7415.0903.406_s_001_w2aab3b7c12b1b6b1aab1c17b1Aa"><h3>Background</h3><p>Contrast-enhanced magnetic resonance angiography (CE-MRA) is an accurate and noninvasive method used to screen for renal artery stenosis (RAS). Color Doppler ultrasonography (CDUS) and noncontrast enhanced magnetic resonance angiography (NC-MRA) are considered noninvasive imaging modalities, which require no contrast medium injection.</p></sec><sec id="j_1905-7415.0903.406_s_002_w2aab3b7c12b1b6b1aab1c17b2Aa"><h3>Objectives</h3><p>To compare NC-MRA with CDUS for screening for RAS using CE-MRA as a reference standard.</p></sec><sec id="j_1905-7415.0903.406_s_003_w2aab3b7c12b1b6b1aab1c17b3Aa"><h3>Methods</h3><p>The study was approved by our institutional review board with written informed consent was obtained from all patient participants. We prospectively enrolled 42 consecutive patients who were suspected of having RAS. All patients underwent CDUS, NC-MRA, and CE-MRA of renal arteries. The attending radiologist interpreted the CDUS after scanning the patient. CE-MRA and NC-MRA were separately interpreted by consensus between two radiologists. Data including (1) number of visualized renal arteries, (2) agreement between CDUS and NC-MRA compared with CE-MRA, and (3) time taken for examination, were evaluated.</p></sec><sec id="j_1905-7415.0903.406_s_004_w2aab3b7c12b1b6b1aab1c17b4Aa"><h3>Results</h3><p>We included 102 renal arteries and 306 renal artery segments in the study. NC-MRA visualized significantly more renal artery segments (258 segments) than CDUS (286 segments, P = 0.0004). NC-MRA and CDUS were in good agreement with CE-MRA when determining the degree of stenosis (K<sub>w</sub> = 0.71 and K<sub>w</sub> = 0.66, respectively). NC-MRA took a significantly shorter time for examination (21.2 minutes) than CDUS (47.5 minutes, P &lt;0.0001).</p></sec><sec id="j_1905-7415.0903.406_s_005_w2aab3b7c12b1b6b1aab1c17b5Aa"><h3>Conclusions</h3><p>NC-MRA is comparable to CDUS for screening for renal artery stenosis. However, NC-MRA can visualize more renal artery segments and require shorter examination time than CDUS.</p></sec></abstract>

BackgroundContrast-enhanced magnetic resonance angiography (CE-MRA) is an accurate and noninvasive method used to screen for renal artery stenosis (RAS). Color Doppler ultrasonography (CDUS) and noncontrast enhanced magnetic resonance angiography (NC-MRA) are considered noninvasive imaging modalities, which require no contrast medium injection.ObjectivesTo compare NC-MRA with CDUS for screening for RAS using CE-MRA as a reference standard.MethodsThe study was approved by our institutional review board with written informed consent was obtained from all patient participants. We prospectively enrolled 42 consecutive patients who were suspected of having RAS. All patients underwent CDUS, NC-MRA, and CE-MRA of renal arteries. The attending radiologist interpreted the CDUS after scanning the patient. CE-MRA and NC-MRA were separately interpreted by consensus between two radiologists. Data including (1) number of visualized renal arteries, (2) agreement between CDUS and NC-MRA compared with CE-MRA, and (3) time taken for examination, were evaluated.ResultsWe included 102 renal arteries and 306 renal artery segments in the study. NC-MRA visualized significantly more renal artery segments (258 segments) than CDUS (286 segments, P = 0.0004). NC-MRA and CDUS were in good agreement with CE-MRA when determining the degree of stenosis (Kw = 0.71 and Kw = 0.66, respectively). NC-MRA took a significantly shorter time for examination (21.2 minutes) than CDUS (47.5 minutes, P <0.0001).ConclusionsNC-MRA is comparable to CDUS for screening for renal artery stenosis. However, NC-MRA can visualize more renal artery segments and require shorter examination time than CDUS.

Noncontrast enhanced magnetic resonance angiography is comparable to color Doppler ultrasound for screening for renal artery stenosis, but is faster and shows more segments

Department of Radiology, Faculty of Medicine

Asian Biomedicine

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

BackgroundContrast-enhanced magnetic resonance angiography (CE-MRA) is an accurate and noninvasive method used to screen for renal artery stenosis (RAS). Color...

	Normal	<50% stenosis	≥50% stenosis
Peak systolic velocity (cm/s)	<100	100-179	≥180
Peak systolic velocity ratio of renal artery/aorta	≤3.3	≤3.3	>3.3
Damping waveform of intrarenal artery or acceleration time >0.07 seconds	No	No	Yes

CDUS\CE–MRA	Normal	<50% stenosis	≥50% stenosis	Total
Normal	247	3	0	250
<50% stenosis	1	0	1	2
≥50% stenosis	2	0	4	6
Total	250	3	5	258

NC-MRA\CE–MRA	Normal	<50% stenosis	50% stenosis	Total
Normal	272	3	0	275
<50% stenosis	0	0	0	0
≥50% stenosis	3	2	6	11
Total	275	5	6	286

Noncontrast enhanced magnetic resonance angiography is comparable to color Doppler ultrasound for screening for renal artery stenosis, but is faster and shows more segments

Article Category: Brief communication (Original)

Publicado en línea: 31 ene 2017

Páginas: 373 - 378

DOI: https://doi.org/10.5372/1905-7415.0903.406

Palabras clave
Color Doppler ultrasonography, non-contrast enhanced magnetic resonance angiography, renal artery stenosis

© 2015 Siripat Saejeung, Kawalee Sasiwimolphan, Laddawan Vajragupta, Somjai Wangsuphachart, Monravee Tumkosit

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Diagnostic criteria for the degree of renal artery stenosis [9]

Color Doppler ultrasound and contrast-enhanced magnetic resonance angiography determination of the degree of renal artery stenosis per segment

Noncontrast-enhanced magnetic resonance angiography (NC-MRA) and contrast-enhanced magnetic resonance angiography determination of the degree of renal artery stenosis per segment analysis

Noncontrast enhanced magnetic resonance angiography is comparable to color Doppler ultrasound for screening for renal artery stenosis, but is faster and shows more segments

Article Category: Brief communication (Original)

Publicado en línea: 31 ene 2017

Páginas: 373 - 378

DOI: https://doi.org/10.5372/1905-7415.0903.406

Palabras claveColor Doppler ultrasonography, non-contrast enhanced magnetic resonance angiography, renal artery stenosis

© 2015 Siripat Saejeung, Kawalee Sasiwimolphan, Laddawan Vajragupta, Somjai Wangsuphachart, Monravee Tumkosit

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Figure 1

Diagnostic criteria for the degree of renal artery stenosis [9]

Color Doppler ultrasound and contrast-enhanced magnetic resonance angiography determination of the degree of renal artery stenosis per segment

Noncontrast-enhanced magnetic resonance angiography (NC-MRA) and contrast-enhanced magnetic resonance angiography determination of the degree of renal artery stenosis per segment analysis

Palabras clave
Color Doppler ultrasonography, non-contrast enhanced magnetic resonance angiography, renal artery stenosis