Active clinical trials for "Urinary Calculi"

Incidence of paediatric urolithiasis is increasing in Europe and North America. Nowadays the management of stone disease is a common practice in not endemic country. The surgical's treatment is based on similar techniques as for adults. In the last years due to miniaturization of endoscopic instruments endourology has become the best approach to treat urinary stones in children. The investigators have retrospectively reviewed experience from 01/01/2000 to 28/02/2019 in children ≤ 16 years old affected by urinary stones who underwent rigid and flexible ureterorenoscopy and pecutaneous nephrolitotripsy procedures and recorded clinical data, overall success rate and complication.

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.

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.

Prospective study is to compare between different nephrolithometric scoring systems in prediction of PCNL outcomes in terms of efficacy , success rate and safety in Adult patients with UUT stones unilateral or bilateral, single or multiple, Pelvic or calyceal, primary or recurrent, both gender attending Assuit Urology & Nephrology University Hospital.

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.

Urinary tract infections (UTI) affect the urine pH and may lead to salt precipitation such as struvite. Bacteria with urease activity are known to alkalinise urine, but not much is known on how pH is changing over time during UTI. This study aims at following urine pH progression at the time of diagnosis of UTI and during the treatment phase. Description of the change in urine pH over time will help understanding the risk of struvite formation and potential timing of intervention.

The femur or thigh bone is the strongest and longest bone of the body and about 45 cm long in an average man that means approximately one fourth of the height of individual. It has upper end, lower end and a cylindrical shaft. Upper end consists of head, neck. The neck is about 5 cm long, connects the head to the shaft and is directed upward, medially and slightly forward and making an angle about 125 with shaft but the angle is wider in children. The neck-shaft angle (NSA ) is defined as the angle formed by the neck axis and long axis of the shaft of femur.The knowledge of the neck shaft angle is valuable in the diagnosis and treatment of fracture of upper end of femur. The aim of the study is : to evaluate the normal values of femoral neck-shaft angle to detect factors that may affect this angle as age, and sex, in Egyptian adults from Sohag.

The metabolic evaluation is crucial for determining possible underlying diseases causing stone growth and to consider the lifestyle changes or medical prophylaxis needed to prevent or at least reduce stone recurrence. 24-hour urine collection is the main part of the metabolic evaluation. The time point is suggested between 3 weeks and 3 month after stone removal, but so far there are no studies comparing 24-hour urine prior and after stone removal. In this study, investigators would like to analyze parameters in the 24-hour urine prior and after complete stone removal to see whether metabolic status can be evaluated no matter stone free or not.