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Renal artery stenosis: evaluation with color Doppler flow imaging
A L Desberg1, D M Paushter, G K Lammert
1Department of Radiology, Cleveland Clinic Foundation, OH 44195-5103.
Radiology
|December 1, 1990
Summary
Color Doppler ultrasound is not effective for screening renal artery stenosis (RAS), a common cause of hypertension. The study found it lacked sensitivity in detecting significant RAS, even with established criteria.
Area of Science:
- Nephrology
- Vascular Imaging
- Hypertension Management
Background:
- Renal artery stenosis (RAS) is a primary, correctable cause of hypertension.
- Accurate and efficient screening methods for RAS are crucial for timely intervention.
Purpose of the Study:
- To assess the diagnostic utility of color Doppler flow imaging as a screening tool for significant renal artery stenosis.
- To compare color Doppler findings with conventional angiography in patients with suspected RAS.
Main Methods:
- A double-blind study involving 30 patients (55 kidneys) comparing color Doppler flow imaging with aortography.
- Evaluation of peak systolic velocity (PSV), renal-aortic ratio (RAR), and resistive index using Doppler ultrasound.
- Defined diagnostic criteria for RAS included RAR ≥ 3.5 and/or PSV > 100 cm/sec.
Main Results:
- Color Doppler failed to detect significant RAS, yielding 0% sensitivity for both RAR and PSV criteria.
- Doppler tracings were obtained in 69% of patent renal arteries and 50% of occluded arteries.
- Accessory renal arteries were not visualized by color Doppler in 24% of kidneys.
Conclusions:
- Current color duplex ultrasound technology is inadequate for screening the detection of renal artery stenosis.
- Further advancements in ultrasound technology may be needed to improve RAS screening efficacy.
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