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Improved computer-assisted nuclear imaging in renovascular hypertension.
Journal of Clinical Hypertension
|December 1, 1985
Summary
The 90-second technetium-99m diethylenetriamine pentaacetic acid (99mTc-DTPA) renal scan accurately identifies renal artery stenosis, outperforming the conventional iodine-131 iodohippuran (131I-Hippuran) scan. This noninvasive DTPA scan aids in diagnosing and monitoring renovascular disease.
Area of Science:
- Nephrology
- Nuclear Medicine
- Radiology
Background:
- Renal artery stenosis (RAS) is a significant cause of secondary hypertension and kidney disease.
- Accurate diagnosis and monitoring of RAS are crucial for effective management.
- Conventional imaging techniques have limitations in assessing renal blood flow in RAS.
Purpose of the Study:
- To compare the diagnostic accuracy of computer-assisted 99mTc-DTPA and conventional 131I-Hippuran renal scans in patients with proven RAS.
- To evaluate the utility of dynamic renal scintigraphy in identifying the stenotic side.
Main Methods:
- Nine patients with angiographically proven RAS underwent both 99mTc-DTPA and 131I-Hippuran dynamic renal studies.
- Time-activity curves were analyzed using parameters like differential maximum activity and peak width.
- Results were compared against angiographic findings and a normal subject template.
Main Results:
- The 99mTc-DTPA scan correctly identified the stenotic side in all 9 patients (100% accuracy).
- The 131I-Hippuran scan correctly identified the stenotic side in only 5 patients (57% accuracy).
- Differential maximum activity and peak width were the best discriminatory factors for the 99mTc-DTPA scan.
Conclusions:
- Computer-assisted 90-second 99mTc-DTPA renal scintigraphy is superior to conventional 131I-Hippuran scanning for detecting unilateral renovascular disease.
- The 99mTc-DTPA study demonstrates high predictive value for angiographic findings.
- This noninvasive method is valuable for diagnosing RAS and for serial evaluation post-intervention.