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[Intrarenal duplex sonography in detecting flow changes after renal PTA]
D Vorwerk1, F Speckamp, K Schürmann
1Klinik für Radiologische Diagnostik, RWTH Aachen.
Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|July 1, 1995
Summary
Intrarenal Doppler signal analysis effectively assesses renal artery stenosis after percutaneous transluminal renal angioplasty (PTRA). This noninvasive method reliably detects flow improvements, aiding in patient follow-up.
Area of Science:
- Cardiovascular Imaging
- Interventional Radiology
- Nephrology
Background:
- Renal artery stenosis (RAS) poses significant cardiovascular risks.
- Percutaneous transluminal renal angioplasty (PTRA) is a common treatment for RAS.
- Assessing technical success and monitoring post-PTRA flow is crucial.
Purpose of the Study:
- To evaluate intrarenal Doppler signal changes before and after PTRA.
- To determine the efficacy of Doppler indices in assessing PTRA success.
- To establish Doppler as a noninvasive tool for monitoring RAS treatment.
Main Methods:
- Intrarenal Doppler signals were analyzed in 33 patients before and after PTRA.
- Doppler flow curves were assessed using acceleration index (AI), acceleration time index (AT), and resistance index (RI).
- Side ratios (AI-R, AT-R, RI-R) were calculated; angiographic success was confirmed in all cases.
Main Results:
- Average stenosis decreased from 71% to 21% post-PTRA.
- Doppler indices significantly improved towards normal values after PTRA.
- AI/AI-R and AI/RI-R indices accurately identified residual stenosis, with only one patient remaining stenotic post-procedure.
Conclusions:
- Intrarenal Doppler signal analysis reliably detects flow changes post-PTRA.
- Doppler indices serve as a noninvasive method to monitor flow improvement after PTRA.
- This technique is valuable for assessing PTRA success and during patient follow-up.