Changes of renal blood flow after ESWL: assessment by ASL MR imaging, contrast enhanced MR imaging, and renal resistive index.
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 12h before and 12h 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.
Abd Ellah
Mohamed
M
Innsbruck Medical University, Radiology Department, Innsbruck, Austria. dr_m_hamdy2006@hotmail.com
Kremser
Christian
C
Pallwein
Leo
L
Aigner
Friedrich
F
Schocke
Michael
M
Peschel
Reinhard
R
Pedross
Florian
F
Pinggera
Germar-Michael
GM
Wolf
Christian
C
Alsharkawy
Mostafa A M
MA
Jaschke
Werner
W
Frauscher
Ferdinand
F
D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D007669:Kidney Calculi / Q000000981:diagnostic imaging / Q000628:therapy*; D008096:Lithotripsy / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D012079:Renal Circulation / Q000502:physiology; D013113:Spin Labels; D018709:Statistics, Nonparametric; D016896:Treatment Outcome; D018608:Ultrasonography, Doppler / Q000379:methods*; D014655:Vascular Resistance
D003287:Contrast Media; D013113:Spin Labels; D019786:Gadolinium DTPA