Aim of this study is to investigate the effects of increased intrarenal pressure during
flexible ureteroscopy on renal blood flow.
Patients undergoing flexible ureteroscopy (F-URS) and laser lithotripsy for kidney stones
according to European Association of Urology (EAU) guidelines on Urolithiasis will be
included in the study after having signed an informed consent form. The pre- and
post-operative evaluation and management will be performed according to EAU Guidelines on
Urolithiasis. Additionally, as a non-invasive test, bilateral renal power Doppler US will be
performed to patients pre- and post-operatively. The pre-operative Doppler US will be
performed 2 days prior to surgery and the post-operative Doppler US will be performed in the
first 24 hours following surgery. The changes on blood flow in renal artery and arcuate
artery will be recorded.