The Value of Contrast-Enhanced Ultrasound versus Doppler Ultrasound in Grading Renal Artery Stenosis

Table 3

Parameters of DUS and CEUS in the diagnosis and grading renal artery stenosis.

	SR (%), median (min, max)	PSV (cm/s)	(mm)	(mm)
Grade I	42.76 (33.65, 48.12)
Grade II	58.89 (51.01, 67.55)
Grade III	84.81 (72.94, 97.27)	^#	^#
Grade IV	100	0	0
P	—	<0.001	<0.001	0.976

Grade I (stenosis rate: 30%-49%), grade II (stenosis rate: 50%-69%), grade III (stenosis rate: 70%-99%), and grade IV (stenosis rate: 100%); SR: stenosis rate; PSV: peak systolic velocity at the stenosed segment of the renal artery by the Doppler ultrasound; : the minimum diameter at the stenosed segment of the renal artery by contrast-enhanced ultrasound; : maximum diameter of the normal renal artery by contrast-enhanced ultrasound.