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Transplant renal artery stenosis: evaluation with duplex sonography
J F Snider1, D W Hunter, G P Moradian
1Department of Diagnostic Radiology, University of Minnesota Hospital and Clinic, Minneapolis 55455.
Radiology
|September 1, 1989
Summary
Duplex sonography offers a highly accurate, noninvasive method for detecting renal artery stenosis in kidney transplant recipients. This ultrasound technique shows high sensitivity and specificity, reducing the need for invasive angiography.
Area of Science:
- Nephrology
- Vascular Surgery
- Diagnostic Imaging
Background:
- Hypertension is a common complication in renal transplant recipients.
- Diagnosing the cause of hypertension often requires invasive angiography.
- Noninvasive diagnostic methods are sought to evaluate transplant vasculature.
Purpose of the Study:
- To evaluate the diagnostic accuracy of duplex sonography for transplant renal artery stenosis.
- To compare duplex sonography findings with arteriography in renal transplant recipients.
Main Methods:
- Duplex sonography was performed on 31 renal transplant recipients.
- Arteriography was used as a correlative diagnostic tool.
- Stenosis was indicated by a frequency shift >7.5 kHz and distal turbulence on duplex sonography.
Main Results:
- Duplex sonography correctly identified renal artery stenosis in 16 of 18 patients.
- Angiography confirmed significant stenosis in 16 patients and no lesion in 2.
- The sensitivity was 94.1% and specificity was 86.7% for duplex sonography.
Conclusions:
- Duplex sonography is an excellent noninvasive screening tool for transplant renal artery stenosis.
- It demonstrates high sensitivity and specificity in diagnosing this condition.
- This method can reduce the need for invasive diagnostic procedures.