Active clinical trials for "Urolithiasis"

Guidelines for endourological procedures during COVID-19 have suggested deferring all elective procedures, while obstructed/ infected stones should undergo urgent decompression. At our centre, screening protocols were implemented with prioritization strategies so that elective care could safely continue at deescalated rates. COVID or septic patients underwent emergency decompression, while non-COVID and non-septic patients underwent primary ureteroscopy (URS) or retrograde intrarenal surgery (RIRS). We aim to report our experience with endourological surgery for stone disease during COVID-19.

To determine the optimal time between the first and second operations in patients with bilateral kidney stones and scheduled percutaneous nephrolithotomy for the contralateral kidney. Patients who underwent percutaneous nephrolithotomy to the contralateral kidney 2-4 weeks and 4-6 weeks after the first operation will be compared.

We aim to determine the preoperative predictors of sepsis after percutaneous nephrolithotomy (PCNL) in patients with unilateral, solitary and proximal ureteral stones.

Background: Squamous metaplasia refers to the pathological transformation of the urothelium leading to non-keratinised stratified squamous metaplasia (N-KSM). Objective: To present the investigators experiences in the diagnosis and treatment of N-KSM of the urinary bladder in children.

Objective:The aim of this study is to investigate the prevalence and associated factors of pediatric urolithiasis in Kashgar area in China. Methods: The investigators carry out a cross-sectional survey among children aged 0 to14 years across Kashgar area in China. The participants are selected by a two-stage and clustered random sampling method. Participants are asked to undergo urinary tract ultrasonographic examinations, provided blood and urine samples to analyze. Their parents or guardians are asked to fill out the questionnaires. Children those who are found with any abnormalities of their urinary system by ulrtasonography will undergo a low-dose computed tomography (CT) to confirm the abnormalities. The end point of this study is to calculate the prevalence rate, distribution and associated factors of pediatric urolithiasis in Kashi area.

The aim of the study was to compare the ultrastructural changes in the renal parenchyma with the results of postprocessing CT analysis with contrast enhancement in patients with urolithiasis.

Calcium oxalate stone, the most common type worldwide, has a recurrence rate of around 50% in ten years. Therefore, identifying the underlying pathophysiological aspects via metabolic evaluation and suggestions for medical & dietary prophylaxis in calcium stone patients is of upmost importance. However, one of the greatest problem with metabolic evaluation and subsequent therapeutic advices is the patient compliance. Therefore, it is important to identify factors related to patient compliance for metabolic evaluation and medical & dietary prophylaxis in calcium stone patients

The aim of this study is to investigate the outcomes of total nephrectomy on patients with kidney stone disease.

The incidence of nephrolithiasis in children has been reported to increase by approximately 6-10% annually, and the incidence is currently 50 per 100,000 children with high recurrent rate. Investigators aimed to determine the metabolic risk factors in Chinese children through metabolic evaluation. In order to identify diagnostic criteria of hypocitraturia and hyperoxaluria in western country wether adapt to Chinese children, investigators aim to determine normal urine levels of oxalate and citrate in children without kidney stone.

The ability to predict stone composition, which influences patient treatment, depends on the accurate measurement of CT attenuation of stones. We will study the effects of stone composition, stone size, and scan collimation width on the measurement of attenuation in vitro.