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Duplex sonography of normal renal allografts
B Schwaighofer1, F Kainberger, F Fruehwald
1Department of Diagnostic Radiology, University of Vienna, Austria.
Acta Radiologica (Stockholm, Sweden : 1987)
|January 1, 1989
Summary
Duplex sonography effectively evaluates renal blood flow in kidney transplants. This non-invasive method helps monitor renal allografts and native kidneys, distinguishing normal flow from vascular rejection.
Area of Science:
- Nephrology
- Radiology
- Vascular Imaging
Background:
- Renal allograft monitoring is crucial for long-term patient survival.
- Assessing renal blood flow non-invasively aids in early detection of complications.
- Duplex sonography offers a potential method for evaluating kidney transplant perfusion.
Purpose of the Study:
- To define normal renal blood flow parameters using duplex sonography.
- To compare blood flow patterns in renal allografts versus native kidneys.
- To assess the utility of duplex sonography in detecting vascular rejection.
Main Methods:
- Duplex sonography was performed on 35 renal allograft recipients and 10 healthy volunteers.
- Blood flow was measured in main, segmental, interlobar, and arcuate renal arteries.
- Resistive index (RI) and Doppler waveforms were analyzed to establish normal ranges and detect abnormalities.
Main Results:
- Normal renal blood flow patterns were characterized by rapid systolic up-slope and persistent diastolic flow.
- No significant difference in resistive index (RI) was found between allografted and native kidneys (mean RI 0.68).
- Duplex sonography significantly discriminated vascular rejection in 11 patients (p < 0.001).
Conclusions:
- Duplex sonography is a valuable, non-invasive tool for assessing renal blood flow.
- This technique is suitable for the long-term follow-up of renal allograft recipients.
- It aids in differentiating normal renal perfusion from pathological states like vascular rejection.