Active clinical trials for "Ureteral Calculi"

This is a single institution, prospective study to evaluate the prognostic significance of renal and bladder ultrasound with ureteral jet assessment and its utility to evaluate the spontaneous stone passage rate of ureteral stones.

Ureteral stones may be silent in 5.3% of patients. The goal of this study was to prospectively evaluate the impact of a silent ureteral stone on renal function.

The purpose of this study is to see whether patients undergoing ESWL, for upper tract urinary stones between 1.5-2.0cm, may be treated by expulsion therapy(Tamsulosin) instead of inserting ureteral stents .

Urolithiasis is one of the most common urological diseases. The risk of urolithiasis is estimated to be between 5% and 12% all over the world with increased incidence in male rather than female (2:1) respectively . Ureteral stones account for 20% from all urinary tract stones, more than 70% of the ureteral stones found in the lower third of the ureter . The incidence of urinary stones has been increasing day by day. Medical expulsive therapy (MET) of ureteral stones is the investigators' concern in this study. Stone location, size, number, ureteral spasm, mucosal edema or inflammation and ureteral anatomy are the factors affecting passage of the ureteral stones. So, MET is based on mechanism that stone passage is facilitated by the relaxation of ureteral smooth muscle , increasing hydrostatic pressure proximal to the stone and decreasing exciting edema . There are many oral medication could be used as MET such as adrenergic blockers, calcium channel blockers, prostaglandin synthesis inhibitors, glyceryl trinitrate and steroid treatment . Calcium-channel blockers and adrenergic α-antagonists are the main that has been proposed to enhance stone passage as expulsive medical therapy. Cyclic nucleotides are degraded by phosphodiesterases enzymes (PDEs). So using of PDE inhibtors may play role in relaxation of smooth muscle of the ureter. A study was done for evaluation of three PDE5 inhibtors, sildenafil , vardenafil and tadalafil, they found that PDE5 inhibitors can reverse the tension of isolated human ureteral smooth muscle via cGMP-mediated pathways.

To compare staged ureteroscopy following initial urinary drainage versus direct ureteroscopy without initial urinary drainage in the treatment of obstructive calcular anuria with acute renal failure in children.

The aim of this study was to evaluate the role of flexible cystoscopy in preventing malpositioning of the ureteral stent after laparoscopic ureterolithotomy in male patients. From April 2009 to June 2015, 97 male patients with stones >1.8 cm in the upper ureter underwent intracorporeal double-J stenting of the ureter after laparoscopic ureterolithotomy performed by four different surgeons. In the last 50 patients who underwent laparoscopic ureterolithotomy flexible cystoscopy was performed through the urethral route to confirm the position of the double-J stent, while in the first 47 correct positioning of the stent was confirmed through postoperative KUB.

Randomized comparison of patient outcomes following fluoroscopic guided PCNL versus ultrasound-guided PCNL.

A comparison on the outcomes of patients undergoing shockwave lithotripsy using the Storz machine versus the Dornier machine.

Proper selection of ureteral stent length might help in reducing comorbidities associated with ureteral stenting, currently there is no standardized way of measuring ureteral length. Measurement of ureteral length according to Computed Tomography (CT) scan might provide useful information when selecting the length of a ureteral stent. Our aim in this study is to compare ureteral measurements using CT scan and measurement of actual ureteral length measured during ureteral stenting.

This study will be conducted to compare the success and complication rates of ureteroscopy, and shockwaves lithotripsy for treatment of upper ureteric stones ≤1 cm.