title: Changes of renal blood flow after ESWL: assessment by ASL MR imaging, contrast enhanced MR imaging, and renal resistive index.
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 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.
authors.affiliation: Innsbruck Medical University, Radiology Department, Innsbruck, Austria. dr_m_hamdy2006@hotmail.com
authors.forename: Mohamed
authors.initials: M
authors.lastname: Abd Ellah
authors.forename: Christian
authors.initials: C
authors.lastname: Kremser
authors.forename: Leo
authors.initials: L
authors.lastname: Pallwein
authors.forename: Friedrich
authors.initials: F
authors.lastname: Aigner
authors.forename: Michael
authors.initials: M
authors.lastname: Schocke
authors.forename: Reinhard
authors.initials: R
authors.lastname: Peschel
authors.forename: Florian
authors.initials: F
authors.lastname: Pedross
authors.forename: Germar-Michael
authors.initials: GM
authors.lastname: Pinggera
authors.forename: Christian
authors.initials: C
authors.lastname: Wolf
authors.forename: Mostafa A M
authors.initials: MA
authors.lastname: Alsharkawy
authors.forename: Werner
authors.initials: W
authors.lastname: Jaschke
authors.forename: Ferdinand
authors.initials: F
authors.lastname: Frauscher
mesh_terms: 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
chemical_list: D003287:Contrast Media; D013113:Spin Labels; D019786:Gadolinium DTPA