双功能超声和磁共振成像诊断肾动脉狭窄的比较

目的比较双功能超声（DUS）和磁共振造影（MRA）诊断血流动力学显著改变的肾动脉狭窄的价值。方法本研究通过双功能超声和磁共振造影和数字血管减影检测临床可疑的肾血管性高血压患者肾动脉,根据DSA评价DUS和MRA的结果。结果 85例患者中168个肾脏动脉检测,DUS检测显著肾动脉狭窄的敏感性和特异性分别为83%和88%。磁共振造影可以获得满意的成像质量（仅有1例除外）。磁共振造影诊断肾动脉狭窄的敏感度和特异度分别为93%和93%。结论 MRA诊断肾动脉狭窄的敏感度和特异度都优于DUS,DUS可以作为肾动脉狭窄的筛查手段。

A comparative study of duplex ultrasonography and magnetic resonance imaging in significant renal artery stenosis

Objective To evaluate duplex ultrasonography(DUS) and magnetic resonance angiography(MRA) in haemodynamically significant renal artery stenosis(RAS).Methods The research subjects were patients with high clinical suspicion of renovascular hypertension(RVH).The imaging of renal arteries was performed by DUS,MRA and digital subtraction angiography(DSA).The results of DUS and MRA were assessed according to the results of DSA.Results Arterial supply of 168 kidneys in 85 patients was evaluated.In diagnosis of significant RAS,the sensitivity and specificity of DUS were 83% and 88% respectively.MRA achieved satisfactory imaging quality except one kidney.The sensitivity and specificity of MRA in diagnosis of significant RAS were 93% and 93% respectively.Conclusion In patients with high clinical suspicion of RVH,MRA is better in both sensitivity and specificity than DUS in diagnosis of significant RAS,DUS is a screening method with low cost and convenience.