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Changes of renal blood flow after ESWL: Assessment by ASL MR imaging, contrast enhanced MR imaging, and renal resistive index |
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| Authors: | Mohamed Abd Ellah Christian Kremser Leo Pallwein Friedrich Aigner Michael Schocke Reinhard Peschel Florian Pedross Germar-Michael Pinggera Christian Wolf Mostafa AM Alsharkawy Werner Jaschke Ferdinand Frauscher |
| Institution: | a Innsbruck Medical University, Radiology Dept., Anich St. 35, 6020 Innsbruck, Austria b Innsbruck Medical University, Urology Dept., Anich St. 35, 6020 Innsbruck, Austria c Innsbruck Medical University, Medical Statistics Dept., Anich St. 35, 6020 Innsbruck, Austria d Assiut University, Radiology Dept., Assiut, Egypt |
| Abstract: | The annual incidence of stone formation is increased in the industrialised world. Extracorporeal shockwave lithotripsy is a non-invasive effective treatment of upper urinary tract stones. This study is aimed to evaluate changes of renal blood flow in patients undergoing extracorporeal shock wave lithotripsy (ESWL) by arterial spin labeling (ASL) MR imaging, contrast enhanced dynamic MR imaging, and renal resistive index (RI). Thirteen patients with nephrolithiasis were examined using MR imaging and Doppler ultrasound 12 h before and 12 h after ESWL. ASL sequence was done for both kidneys and followed by contrast enhanced MR imaging. In addition RI Doppler ultrasound measurements were performed. A significant increase in RI (p < 0.001) was found in both treated and untreated kidneys. ASL MR imaging also showed significant changes in both kidneys (p < 0.001). Contrast enhanced dynamic MR imaging did not show significant changes in the kidneys. ESWL causes changes in RI and ASL MR imaging, which seem to reflect changes in renal blood flow. |
| Keywords: | ESWL (extracorporeal shock wave lithotripsy) Renal blood flow MRI Ultrasound Contrast agents Doppler ultrasound |
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